JPH08103738A - Parts cleaning method and its device and parts - Google Patents

Abstract

(57) [Abstract] [Problem] Setting as an environmentally destructive substance by using a non-combustible semi-aqueous cleaning agent to remove resin stains that adhere to parts that could only be cleaned with a flammable solvent with a low flash point. Reduce or eliminate the amount of chlorine-based solvents used. In a component cleaning method for removing an unnecessary protective layer or resin stain 7 adhering to an object to be cleaned 6, a nonflammable cleaning agent is used as a cleaning agent, and the nonflammable cleaning agent is used in the first dipping tank 2. The ultrasonic cleaning process is performed under the first condition, and then the shower cleaning process is performed under the second condition in the shower tank 4 of the second tank using the nonflammable cleaning agent to remove the protective layer or the resin stain.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a lens, a mirror,
The present invention relates to a part cleaning method for removing a resin including a protective film adhering to the surface of an optical part and an adhesive layer in cleaning precision optical parts such as prisms, and an apparatus and part thereof.

[0002]

2. Description of the Related Art Conventionally, in the manufacturing process of glass polyhedron optical parts such as lenses, a protective film is applied to the glass surface in order to prevent "burn" caused by the contact of the glass surface with moisture. I have something to do. Since this protective film is required to have durability such as water resistance and abrasion resistance, a resin having specifications that satisfy these requirements is used as the protective film.

Resins of this type include, for example, chloroprene rubber-based resins and vinyl acetate-based resins, which are used as protective films by coating them on the lens surface, and these protective films are completed after the step of contacting with water. Since it is unnecessary, the protective film must be completely removed from the surface of the optical component in the cleaning step at least before the lens coating step, which is called resin stain. That is, it is the resin applied to the lens, which is necessary until the end of polishing, but after the end of polishing, it is considered as unnecessary (= dirt) on the lens. To do.

Therefore, according to the conventional protective film cleaning process,
A chlorine-based solvent represented by tetrachloroethylene is used as a cleaning agent. This is because these chlorine-based solvents have properties of high penetrating power and detergency, and are effective when used for washing resins that are difficult to remove by washing. However, in the case of a strong resin, it is not easy to completely remove the protective film even if it is washed by using tetrachloroethylene. Therefore, according to a general resin washing method, a chlorine-based solvent was used. A method is employed in which the resin attached to the surface of the object to be cleaned is expanded in advance by ultrasonic cleaning and then completely removed by hand wiping or the like.

[0005]

As described above, a chlorine-based solvent such as tetrachloroethylene has excellent penetrating power and detergency, and therefore has excellent properties as a cleaning agent. It can be removed by washing.
However, tetrachlorethylene has recently been certified as a subject of regulations on soil pollution problems and working environment concentrations, and it is said that future large-scale use or permanent use thereof is not preferable. Furthermore, in recent years, the problem of ozone layer depletion due to chlorine-based solvents has been taken up worldwide, and for that reason, the demand for non-chlorine-based cleaning agents that replace tetrachloroethylene is rapidly increasing.

Therefore, petroleum-based cleaning agents, quasi-water-based cleaning agents, and water-based cleaning agents have been investigated as cleaning agents that replace tetrachloroethylene. However, among petroleum-based solvents, solvents with a low flash point, such as the first petroleums and the second petroleums, are not easy to handle because the total amount is regulated by the Fire Service Law, and they are not easily handled in the washing process. The cost of incidental equipment and the like is increased due to the use of the solvent.

Further, in the case of a solvent having a high flash point such as a third petroleum or less, the handling becomes easy and the incidental equipment investment can be minimized because the designated quantity becomes large, etc. It has the drawback of decreasing. Therefore, cleaning with a solvent having a high flash point makes it difficult to clean and remove substances such as resin.

On the other hand, a water-based or semi-water-based cleaning agent having no flash point is expected in various fields as a cleaning agent because of its safety and ease of legal handling. However, since these water-based and semi-water-based cleaning agents are inferior in surface tension, penetrating power and cleaning power to petroleum-based solvents and chlorine-based solvents, it is extremely difficult to sufficiently remove resin stains.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and it is possible to remove resin stains and the like attached to parts which could be washed only with a chlorine solvent or a flammable solvent having a low flash point. The purpose is to reduce the amount of chlorine-based solvents certified as environmentally destructive substances or to eliminate them by making it possible to remove tertiary oils with high flash points by washing.

Further, it has been set as an environmentally destructive substance by using a nonflammable cleaning agent to remove resin stains and the like adhering to parts that could only be cleaned with a chlorine-based solvent or a flammable solvent having a low flash point. The purpose is to reduce or eliminate the use of chlorine-based solvents. And
It is possible to remove resin stains etc. attached to parts that could only be cleaned with a flammable solvent with a low flash point with a non-flammable semi-aqueous cleaning agent. The purpose is to reduce or eliminate.

[0011]

In order to solve the above-mentioned problems and to achieve the object, the present invention uses N-methyl-2-pyrrolidone, which is a third petroleum, as a cleaning agent for ultrasonic immersion cleaning and shower cleaning. By performing the two-tank cleaning, for example, resin stains and the like are completely removed from the surface of the precision optical component that is the object to be cleaned. Specifically, it is difficult to remove like a curable resin such as an adhesive by performing ultrasonic immersion cleaning with N-methyl-2pyrrolidone in the first tank and then shower-cleaning with N-methyl-2pyrrolidone in the second tank as well. It works as if you were cleaning it completely.

Preferably, a non-combustible semi-aqueous cleaning agent is used as a cleaning agent, and ultrasonic bath immersion cleaning and shower cleaning are performed in two tanks so that, for example, the surface of the precision optical component, which is the object to be cleaned, is stained with resin. It completely removes the others. In detail, ultrasonic cleaning is performed in the first tank by non-combustible semi-aqueous cleaning, and then in the second tank by shower cleaning with the same non-combustible semi-aqueous cleaning agent so that a curable resin such as an adhesive can be obtained. It works to completely clean and remove those that are difficult to remove.

The non-combustible semi-aqueous cleaning material is a mixture of a water-soluble solvent and water. As the water-soluble solvent, for example,
Methanol, ethanol, i-propyl alcohol, n
-Propyl alcohol, alcohols such as 3-methyl-3-methoxybutanol, N-methyl-2-pyrrolidone, acetic acid, acetone, acetaldehyde, pyridine, ethylene glycol, glycerin, etc. are available. When it is selected as an agent, it is selected according to the solubility parameter and the like. By mixing these water-soluble solvents with water, the mixture is rendered incombustible. The mixing ratio varies depending on the solvent, but in most cases, the composition exhibits noncombustibility at a water content of 40% or less.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a model diagram of component cleaning common to each embodiment. As shown in the figure, the object to be cleaned 6 has an object to be cleaned 6 to which a resin 7 is attached so as not to cause “burn” caused by the contact of the glass surface with moisture.
Is.

The article 6 to be cleaned is placed in a 2 liquid of N-methyl-2pyrrolidone kept at a temperature of 20 ° C. or higher, preferably 40 ° C. or higher, and then ultrasonically dipped. For this reason, the ultrasonic oscillating device 3 is fixed at the bottom of the first tank 1, the frequency is 20 to 100 kHz, preferably 28 to 40 kHz, the output is 300 W or more, preferably 500 W or more, and the output density is 0.3 W / cm 2. Ultrasonic cleaning is preferably performed at 0.5 W / cm 2 or more. By this ultrasonic immersion, the cleaning target 6 is kept for 1 minute or more, preferably 3
The resin 7 adhering to the object 6 to be cleaned after a lapse of more than a minute
Expands and partially dissolves.

After the ultrasonic cleaning in the first tank 1 is completed, the object 6 to be cleaned is put into the shower tank for cleaning N-methyl-2-pyrrolidone in the second tank 4. A shower 5 is provided in the second tank 4 and is to be cleaned at 300 liters / hour or more, preferably 500 liters / hour or more, and a pressure from the outlet of 1 kg / cm 2 or more, preferably 5 kg / cm 2 or more. The object 6 is sprayed onto the object 6 and the object 6 to be cleaned is shower-cleaned in the second tank 4 for 1 minute or longer, preferably 3 minutes or longer. By this shower cleaning, the resin 7 swollen and partially dissolved in the first tank 1 is completely removed from the object 6 to be cleaned. The first to sixth embodiments in which various conditions are set will be described below.

[First Embodiment] In the first embodiment,
The case where the diameter is 50 mm, the thickness is 5 mm, the material is BK7 (Shot Co., Ltd.'s nomenclature for glass, and represents the material of glass), and the optical lenses of both planes are used as the object to be cleaned, and protection is performed. Immerse in vinyl acetate adhesive to form a film. After this immersion, the film is pulled up at a speed of 5 cm / sec and then left in the atmosphere at 80 ° C. for 24 hours. In this way, the optical lens with the protective film completely attached to the lens surface is put into the ultrasonic immersion cleaning tank 1 and
With N-methyl-2-pyrrolidone at 0 ° C, 28 kHz, 60
The first washing is performed with 0 W ultrasonic waves for 3 minutes. After completion of this ultrasonic cleaning, the lens is transferred to the N-methyl-2-pyrrolidone shower cleaning tank in the second tank 4 and shower cleaning is performed at a flow rate of 300 liters / hour, a pressure of 5 kg / cm @ 2, and a temperature of 50 DEG C. for 3 minutes. After completion of the shower cleaning, the object to be cleaned is completely dried. After that, as a result of calculating the weight change rate of the object to be cleaned before adhesion of the adhesive and after completion of cleaning and drying by the following formula 1, "1" was obtained, and thus it was confirmed that the protective film could be cleaned 100%. did it.

[0019]

[Formula 1] Weight change rate = Weight after washing / Weight before washing [Second Embodiment] In the second embodiment, the diameter is 150.
mm, thickness 50 mm, material BK7, biplanar optical lens, apply protective film under the same conditions as in the first embodiment, dry and wash, and completely dry the object to be washed after washing. After that, as a result of calculating the weight change rate of the object to be cleaned after adhesion of the protective film and completion of cleaning and drying with the formula 1, since "1" was obtained, it was confirmed that the protective film could be cleaned 100%. .

[Third Embodiment] In the third embodiment,
After dipping an optical lens having a diameter of 50 mm, a thickness of 5 mm, a material of BK7, and a two-plane shape in a polyvinyl alcohol adhesive diluted to 20% with ethyl acetate,
It is pulled up at a speed of 5 cm / sec and left at 80 ° C. for 24 hours to form a protective film. After this, after washing under the same conditions as in the first embodiment, the article to be washed is dried, and the weight change rate of the article to be washed before adhesion of the protective film and after completion of washing is calculated by the formula 1. As a result, since "1" was obtained, the protective film was 1
It was confirmed that it could be washed by 00%.

[Fourth Embodiment] In the fourth embodiment,
An optical lens having a diameter of 50 mm, a thickness of 5 mm, a material of BK7, and a two-plane shape is immersed in a vinyl acetate adhesive. After this immersion, the film is pulled up at a speed of 5 cm / sec and left at 80 ° C. for 30 days. After this, after washing under the same conditions as in the above-described first embodiment, the article to be washed is dried, and the weight change rate of the article to be washed before adhesion of the protective film and after completion of washing and drying is calculated by the formula 1. , "1", so the protective film is 1
It was confirmed that it could be washed by 00%.

[Fifth Embodiment] In the fifth embodiment,
An optical lens having a diameter of 50 mm, a thickness of 5 mm, a material of BK7, and a two-plane shape is immersed in a vinyl acetate adhesive. After this immersion, the film is pulled up at a speed of 5 cm / sec and left at 80 ° C. for 24 hours. In this way, the lens with the adhesive completely adhered to the lens surface is put into an ultrasonic immersion cleaning tank, and it is treated with N-methyl-2pyrrolidone at 40 ° C.
The first tank is washed with ultrasonic waves of 1200 Hz for 3 minutes. After the ultrasonic cleaning is completed, the lens is transferred to the N-methyl-2-pyrrolidone shower cleaning device in the second tank, and shower cleaning is performed for 3 minutes at a flow rate of 500 liters / hour, a pressure of 7 kg / cm @ 2, and a temperature of 40.degree. After the shower cleaning is completed, the object to be cleaned is completely dried. As a result of calculating the weight change rate of the object to be cleaned before adhesion and after drying after completion of cleaning by the formula 1, it was confirmed that 100% of the protective film could be cleaned since "1" was obtained. [Sixth Embodiment] In the sixth embodiment, the diameter is 50 m.
An optical lens having a thickness of 5 mm, a thickness of 5 mm, a material of BK7, and a biplanar shape is immersed in a vinyl acetate adhesive. After this immersion, the film is pulled up at a speed of 5 cm / sec and left at 80 ° C. for 24 hours. In this way, the lens with the adhesive completely adhered to the lens surface is put in an ultrasonic immersion cleaning tank and
28 kHz, 600 with N-methyl-2-pyrrolidone at ℃
The first tank is cleaned with W ultrasonic waves for 3 minutes. After the ultrasonic cleaning, the lens was transferred to the N-methyl-2-pyrrolidone shower cleaning device in the second tank, and the flow rate was 300 liters / hour and the pressure was 5
Shower washing is carried out at a temperature of 40 ° C. for 3 minutes at kg / cm 2. After the shower cleaning is completed, the object to be cleaned is completely dried. As a result of calculating the weight change rate of the object to be cleaned before adhesion adhesion and after completion of cleaning and drying by Equation 1, as a result of “1”, it was confirmed that the protective film could be cleaned 100%. Hereinafter, seventh to sixteenth embodiments of the present invention will be described with reference to the model diagram common to each embodiment of FIG.

As shown in the figure, the object to be cleaned is of a chloroprene type, a vinyl acetate type or a polyvinyl alcohol type in order to prevent "burn" which is caused by the contact of the glass surface with moisture. Resin 7
The object 6 to be cleaned is placed in the non-combustible semi-aqueous cleaning agent liquid kept at a temperature of 40 ° C. or higher, preferably 50 ° C. or higher, and then ultrasonically dipped in the optical component having adhered thereto.

For this reason, the ultrasonic bath 3 is fixed at the bottom of the first tank 1, and the frequency is 20 to 100.
Ultrasonic cleaning is performed at a kHz of preferably 28 to 40 kHz and an output of 300 W or more, preferably 500 W or more, and an output density of 0.1 W / cm 2 or more, preferably 0.5 W / cm 2 or more. By the ultrasonic immersion, the object to be cleaned 6 is kept for 3 minutes or more, preferably 5
The resin 7 adhering to the article to be cleaned 6 expands and partially dissolves after a lapse of time of not less than minutes.

After the ultrasonic cleaning in the first tank 1 is completed, the object 6 to be cleaned is put into the shower cleaning tank of the non-combustible semi-aqueous cleaning agent in the second tank 4. A shower 5 is arranged in the second tank 4 and is sprayed onto the article to be cleaned 6 at a pressure of 1 kg / cm 2 from a blow-out port at a rate of 300 liters / hour or more, preferably 500 liters / hour or more. By subjecting the article 6 to be cleaned in the tank 4 to shower cleaning for 3 minutes or more, preferably 5 minutes or more, the resin 7 swollen and partially dissolved in the first tank 1 is completely removed from the article 6 to be cleaned. Will be done.

The cleaning liquid temperature, ultrasonic frequency,
When the ultrasonic output, the ultrasonic output density, the cleaning time, the shower flow rate, the shower pressure, and the shower cleaning time do not satisfy the above conditions, the cleaning effect is deteriorated and the resin cannot be sufficiently removed. Seventh to sixteenth embodiments in which various conditions are set will be described below.

[Seventh Embodiment] In the seventh embodiment,
In the case where an optical lens having a diameter of 50 mm, a thickness of 5 mm, a material of BK7, and a two-plane shape is used as an object to be cleaned, it is immersed in a chloroprene adhesive to form a protective film. After this immersion, the substrate is pulled up at a speed of 5 cm / sec and then left in the atmosphere at 80 ° C. for 24 hours. In this way, the optical lens with the protective film completely attached to the lens surface is put into the ultrasonic immersion cleaning tank 1 and the N 2
With a mixed detergent of 85% by volume of pyrrolidone and 15% by volume of water, 28 kHz, 600 W ,. A first wash is performed with 1 W / cm 2 ultrasonic waves for 5 minutes. It has been confirmed that this mixed solution is nonflammable by the tag closed flash point test.

After completion of the ultrasonic cleaning, the lens is transferred to the shower cleaning tank of the second tank 4 containing 85% by volume of N-methyl-2-pyrrolidone and 15% by volume of water, and a flow rate of 300 liters / hour and a pressure of 5 kg / cm 2. Shower wash for 5 minutes. After completion of the shower cleaning, the object to be cleaned is completely dried. After that, as a result of calculating the weight change rate of the object to be cleaned before the adhesion of the adhesive and after the cleaning and drying by the above-mentioned formula 1, since "1" was obtained, it was confirmed that the protective film could be cleaned 100%. It was

[Eighth Embodiment] In the eighth embodiment,
An optical glass having a diameter of 150 mm, a thickness of 50 mm, a material of BK7, and a two-plane shape is coated with a protective film under the same conditions as in the seventh embodiment, dried and washed, and completely covered after the washing is completed. After the washed material was dried, the weight change rate of the object to be cleaned after the adhesion of the protective film and the completion of washing and drying was calculated by the above formula 1. As a result, since "1" was obtained, the protective film was 10
It was confirmed that 0% cleaning was possible.

[Ninth Embodiment] In the ninth embodiment,
After a protective film is applied and dried on an optical glass (lens) having a diameter of 50 mm, a thickness of 5 mm, a material of BK7, and a biplanar shape under the same conditions as in the seventh embodiment, C at 50 ° C.
Using a mixed detergent of 85% by volume of N-methyl-2-pyrrolidone and 15% by volume of water, 40 kHz, 600 W, 0.1 W /
A first wash is performed for 5 minutes with ultrasonic waves of cm 2.

After completion of this ultrasonic cleaning, the lens was placed in the second tank 4 and contained 85% by volume of N-methyl-2-pyrrolidone and 15% by volume of water.
The mixture is transferred to the shower cleaning tank of the mixed cleaning agent, and shower cleaning is performed for 5 minutes at a flow rate of 300 Little / hour and a pressure of 5 kg / cm 2.

After the completion of the shower cleaning, the object to be cleaned is completely dried, and then the weight change ratio of the object to be cleaned after adhesion of the protective film and the completion of the cleaning is calculated by the above formula 1,
Since "1" was obtained, it was confirmed that the protective film could be washed 100%.

[Tenth Embodiment] In the tenth embodiment, an optical glass having a diameter of 50 mm, a thickness of 5 mm, a material of BK7, and a biplanar shape is protected under the same conditions as in the first embodiment. After coating and drying the film, the film was transferred to a shower washing tank of a mixed detergent of 85% by volume of N-methyl-2-pyrrolidone and 15% by volume of water at 80 ° C., the flow rate was 300 liters / hour, and the pressure was 5 k.
Perform shower washing at g / cm2 for 5 minutes. After completion of this shower cleaning, after completely drying the object to be cleaned, calculation of the weight change rate of the object to be cleaned after adhesion of the protective film and drying after completion of cleaning, as a result, "1" was obtained. 100 protective film
It was confirmed that the cleaning could be completed.

[Eleventh Embodiment] In the eleventh embodiment, an optical lens having a diameter of 50 mm, a thickness of 5 mm, a material of BK7 and a biplanar shape is used as a protective film under the same conditions as in the first embodiment. Was applied and dried, and then washed with a mixed detergent of 80% by volume of 3-methyl-3-methoxybutanol and 20% by volume of water at 50 ° C. in the same manner as in the seventh embodiment. As a result of calculating the adhesion of the protective film after drying and the change in the weight of the object to be cleaned after the cleaning with the above-mentioned formula 1 to obtain “1”, it can be confirmed that the protective film could be cleaned 100%. It was In addition, a mixed solution of a mixed detergent containing 80% by volume of 3-methyl-3-methoxybutanol and 20% by volume of water has been confirmed to be nonflammable by a tag closed flash point test.

[Twelfth Embodiment] In the twelfth embodiment, a mixture of 80% by volume of 3-methyl-3-methoxybutanol and 20% by volume of water at 50 ° C. is used as a cleaning agent.
After performing the cleaning test as in the embodiment, the weight change rate of the object to be cleaned after the adhesion of the protective film and the cleaning was calculated by the above formula 1. As a result, since "1" was obtained, it was confirmed that the protective film could be washed 100%.

[Thirteenth Embodiment] In the thirteenth embodiment, a mixed detergent of 80% by volume of 3-methyl-3-methoxybutanol and 20% by volume of water at 50 ° C. is used as a detergent.
After performing the cleaning test as in the embodiment, the weight change rate of the object to be cleaned after the adhesion of the protective film and the completion of the cleaning and the drying was calculated by the above formula 1. As a result, since "1" was obtained, it was confirmed that the protective film could be washed 100%.

[Fourteenth Embodiment] In the fourteenth embodiment, a mixed detergent of 80% by volume of 3-methyl-3-methoxybutanol and 20% by volume of water at 50 ° C. is used as the detergent.
After performing a cleaning test in the same manner as in the 0th embodiment, the weight change rate of the object to be cleaned after adhesion of the protective film and completion of cleaning and drying was calculated by the above formula 1. As a result, since "1" was obtained, it was confirmed that the protective film could be washed 100%.

[Fifteenth Embodiment] In the fifteenth embodiment, a case where an optical lens having a diameter of 50 mm, a thickness of 5 mm, a material of BK7, and a two-plane shape is used as an object to be cleaned,
Immerse in a polyvinyl alcohol-based adhesive to form a protective film. After this immersion, the substrate is pulled up at a speed of 5 cm / sec and then left in the atmosphere at 80 ° C. for 24 hours. In this way, the optical lens with the protective film completely adhered to the lens surface is treated with 85% by volume of N-methyl-2-pyrrolidone at 50 ° C.
Washing was performed in the same manner as in the seventh embodiment with a mixed detergent containing 15% by volume of water and 15% by volume of water, and the weight change rate of the article to be washed after completion of washing was calculated by the above formula 1. As a result, since "1" was obtained, it was confirmed that the protective film could be washed 100%.

[Sixteenth Embodiment] In the sixteenth embodiment, a case where an optical lens having a diameter of 50 mm, a thickness of 5 mm, a material of BK7, and a two-plane shape is used as an object to be cleaned,
Immerse in a vinyl acetate adhesive to form a protective film. After this immersion, the substrate is pulled up at a speed of 5 cm / sec and then left in the atmosphere at 80 ° C. for 24 hours.

In this way, the optical lens with the protective film completely attached to the lens surface is washed with a mixed detergent of N-methyl-2-pyrrolidone 85% by volume at 50 ° C. in the same manner as in the seventh embodiment, After the object to be cleaned was completely dried after cleaning, the rate of change in weight of the object to be cleaned after adhesion of the protective film and the completion of cleaning was calculated by the above-mentioned formula 1. As a result, since "1" was obtained, it was confirmed that the protective film could be washed 100%.

The following are comparative examples carried out for comparison, showing the case of using isopropyl alcohol instead of N-methyl-2-pyrrolidone and the case of changing the washing conditions. Turned out not enough.

[Comparative Example 1] In Comparative Example 1, the diameter is 50 m.
m, thickness 5 mm, material BK7, biplanar optical lens, coated with a protective film in the same manner as in the first embodiment,
dry. After this drying, washing with isopropyl alcohol is performed by the same method as in the first embodiment. "1.041" was obtained as a result of calculating the weight change rate of the object to be cleaned before the adhesion of the adhesive and after completion of the cleaning and drying by the equation 1 to completely dry the object to be cleaned after the cleaning. Was found to be inadequate.

Comparative Example 2 In Comparative Example 2, the diameter is 50 m.
An optical lens having a thickness of 5 mm, a thickness of 5 mm, a material of BK7, and a biplanar shape is immersed in a vinyl acetate adhesive. After this immersion, the film is pulled up at a speed of 5 cm / sec and left at 80 ° C. for 24 hours. This lens with the adhesive completely adhered to the surface was treated with N-methyl-2-pyrrolidone at 50 ° C at 28 kHz, 6
Only the first tank is cleaned for 3 minutes with an ultrasonic wave of 00W. After completion of the ultrasonic cleaning, the object to be cleaned is completely dried. The rate of change in weight of the object to be washed before adhesion of the adhesive and after washing is calculated using Equation 1
As a result of the calculation in step 1, "1.022" was obtained, which proves that the ultrasonic cleaning alone cannot sufficiently clean the protective film (adhesive).

[Comparative Example 3] In Comparative Example 3, the diameter is 50 m.
An optical lens having a thickness of 5 mm, a thickness of 5 mm, a material of BK7, and a biplanar shape is immersed in a vinyl acetate adhesive. After this immersion, the film is pulled up at a speed of 5 cm / sec and left at 80 ° C. for 24 hours. This lens with the adhesive completely attached to the surface
Flow into the shower washing tank of methyl 2 pyrrolidone at a flow rate of 30
Shower cleaning is performed for 3 minutes at a pressure of 5 kg / cm @ 2 and a temperature of 50.degree. After the shower cleaning is completed, the object to be cleaned is completely dried. As a result of calculating the weight change rate of the object to be cleaned before adhesion and after completion of cleaning and drying by Equation 1, "1.
It was found that the shower cleaning alone is not sufficient for cleaning the protective film (adhesive).

[Comparative Example 4] In Comparative Example 4, the diameter is 50 m.
m, thickness 5 mm, material BK7, biplanar optical glass, a protective film was applied and dried under the same conditions as in the seventh embodiment, and then dried at 30 ° C. N-methyl-2pyrrolidone 8
28kH by mixed detergent of 5% by volume and 15% by volume of water
After completion of the first ultrasonic cleaning for 5 minutes with ultrasonic waves of z, 600 W and 0.1 W / cm 2, the lens was washed with a mixed cleaning agent containing 85% by volume of N-methyl-2pyrrolidone in the second tank 4 and 15% by volume of water. Transferred to the shower washing tank, flow rate 300 liters /
Shower cleaning is performed for 5 minutes at a pressure of 5 kg / cm2. After completion of this shower cleaning, after drying the object to be cleaned completely, the protective film adhesion and the weight change rate of the object to be cleaned after completion of the cleaning were calculated by the formula 1, and as a result, "1.028" was obtained. It was confirmed that the protective film was not sufficiently washed.

[Comparative Example 5] In Comparative Example 5, the diameter is 50 m.
m, thickness 5 mm, material BK7, biplanar optical crow, protective film was applied and dried under the same conditions as in the above-mentioned seventh embodiment, and then N-methyl-2pyrrolidone 85 at 50 ° C. 28% by volume of mixed detergent with 15% by volume of water
The first cleaning is performed for 5 minutes by ultrasonic waves of kHz, 200 W and 0.03 W / cm 2.

After completion of this ultrasonic cleaning, the lens was put in the second tank 4 with 85% by volume of N-methyl-2-pyrrolidone and 15% by volume of water.
It is transferred to the shower cleaning tank of the mixed cleaning agent of (1) and shower washed for 5 minutes at a flow rate of 600 liters / hour and a pressure of 5 kg / cm 2. The rate of change in weight of the object to be cleaned after the completion of shower cleaning and drying was calculated by the above formula 1. As a result, "1.03
Since "0" was obtained, it was confirmed that the protective film was not sufficiently washed.

[Comparative Example 6] In Comparative Example 6, the diameter is 50 m.
m, thickness 5 mm, material BK7, biplanar optical glass, coated with a protective film under the same conditions as in the seventh embodiment, dried, and then dried at 50 ° C. with N-methyl-2pyrrolidone 8
28kH by mixed detergent of 5% by volume and 15% by volume of water
0.5 with ultrasonic waves of z, 600W, 0.1W / cm2
Perform a first wash for minutes. After completion of this ultrasonic cleaning, the lens is transferred to the shower cleaning tank of the second tank 4 containing 85% by volume of N-methyl-2-pyrrolidone and 5% by volume of water, which is a mixed cleaning agent.
Shower cleaning is performed for 5 minutes at 0 liter / hour and a pressure of 5 kg / cm 2. After the completion of the shower cleaning, the object to be cleaned was completely dried, and then the weight change rate of the object to be cleaned after adhesion of the protective film and the completion of cleaning was calculated by the formula 1.
2 ”was obtained, it was confirmed that the protective film was not sufficiently washed.

[Comparative Example 7] In Comparative Example 7, the diameter was 50 m.
m, thickness 5 mm, material BK7, biplanar optical glass, a protective film was applied and dried under the same conditions as in the seventh embodiment, and then dried at 50 ° C. N-methyl-2pyrrolidone 8
200kH by the mixed detergent of 5% by volume and 15% by volume of water
The first cleaning is performed by ultrasonic waves of z, 600 W and 0.1 W / cm 2 for 5 minutes. After the ultrasonic cleaning, the lens is subjected to shower cleaning with a mixed cleaning agent containing 85% by volume of N-methyl-2-pyrrolidone and 15% by volume of water in the second tank 4. After completing this shower cleaning, after completely drying the object to be cleaned,
As a result of calculating the weight change rate of the object to be cleaned after adhesion of the protective film and the completion of cleaning by the equation 1 to obtain “1.022”,
It was confirmed that the protective film was not sufficiently washed.

[Comparative Example 8] In Comparative Example 8, the diameter is 50 m.
m, thickness 5 mm, material BK7, biplanar optical glass, coated with a protective film under the same conditions as in the seventh embodiment, dried, and then dried at 50 ° C. with N-methyl-2pyrrolidone 8
28kH by mixed detergent of 5% by volume and 15% by volume of water
The first cleaning is performed by ultrasonic waves of z, 600 W and 0.1 W / cm 2 for 5 minutes. After completion of this ultrasonic cleaning, the lens was transferred to the shower cleaning tank of the second tank 4 containing 85% by volume of N-methyl-2-pyrrolidone and 15% by volume of water as a cleaning agent, and the flow rate was 100 liters / hour and the pressure was 1.7 kg / cm 2. Shower wash for 5 minutes. After completion of this shower cleaning, after the article to be cleaned is completely dried, the weight change rate of the article to be cleaned after the adhesion of the protective film and the completion of washing is calculated by the formula 1,
Since "1.024" was obtained, it was confirmed that the cleaning of the protective film was not sufficient.

[Comparative Example 9] In Comparative Example 9, the diameter was 50 m.
m, thickness 5 mm, material BK7, biplanar optical glass, coated with a protective film under the same conditions as in the seventh embodiment,
After drying, N-methyl-2-pyrrolidone 85 at 50 ° C
28kH by mixed detergent of volume% and water 15 volume%
The first cleaning is performed by ultrasonic waves of z, 600 W and 0.1 W / cm 2 for 5 minutes. After completion of this ultrasonic cleaning, the lens was transferred to a shower cleaning tank of a mixed cleaning agent of 85% by volume of N-methyl-2-pyrrolidone and 15% by volume of water in the second tank 4 and the flow rate was 3
Shower cleaning is carried out for 0.5 minutes at a pressure of 5 kg / cm 2 at 00 liter / hour. After completion of this shower cleaning, after the article to be cleaned is completely dried, the weight change rate of the article to be cleaned after the adhesion of the protective film and the completion of washing is calculated by the formula 1,
Since "1.021" was obtained, it was confirmed that the cleaning of the protective film was not sufficient.

[Comparative Example 10] Comparative Example 10 has a diameter of 50.
mm, thickness 5 mm, material BK7, biplanar optical glass, after applying a protective film and drying under the same conditions as in the seventh embodiment, the protective film was completely attached to the lens surface. Insert the optical lens into the ultrasonic immersion cleaning tank 1 and
85% by volume of N-methyl-2-pyrrolidone and 15% by volume of water at 0 ° C
28kHz, 600W, 0.1W /
Wash with ultrasonic waves of cm 2 for 5 minutes. After completion of this washing, after the article to be washed is completely dried, the weight change rate of the article to be washed after adhesion of the protective film and washing completion drying was calculated by the formula 1, and as a result, "1.025" was obtained. . It was confirmed that the protective film was not sufficiently washed.

[Comparative Example 11] Comparative Example 11 has a diameter of 50.
mm, thickness 5 mm, material BK7, biplanar optical glass, after applying a protective film and drying under the same conditions as in the seventh embodiment, the protective film was completely attached to the lens surface. The optical lens is the N methyl 2 pyrrolidone 85 in tank 4.
The mixture was poured into a shower cleaning tank of a mixed cleaning agent containing 15% by volume of water and 15% by volume of water, and the flow rate was 300 liters / hour and the pressure was 5 kg / cm.
2. Perform shower cleaning at a temperature of 50 ° C for 5 minutes. After completion of this shower washing, after the article to be washed is completely dried, the weight change rate of the article to be washed after adhesion of the protective film and washing and drying was calculated by the formula 1, and as a result, "1.034" was obtained. From this, it was confirmed that the protective film was not sufficiently washed.

Therefore, as described above, N-methyl-2-pyrrolidone is used as a cleaning agent in the cleaning of precision optical parts, and cleaning is performed by the cleaning method in the step of two tanks. Resin that adheres to precision optical parts that could only be cleaned with chlorine-based solvents or flammable solvents with a low flash point by washing and dipping and then performing shower cleaning in the second shower tank. Dirt and the like can also be removed by using N-methyl-2-pyrrolidone which is a third petroleum. In addition, it is possible to reduce or eliminate the use of chlorine-based solvent, which is an environmentally destructive substance, and to provide a global environment-friendly cleaning method.

Further, cleaning target: resin attached to optical parts, cleaning agent: cleaning agent which is made non-combustible by mixing water with water-soluble agent, cleaning method: ultrasonic cleaning and shower cleaning combined in two tanks In this case, the resin can be washed by optimizing the conditions by the above washing method. That is, a flammable solvent with a high flash point (= low flammability) is used for resin cleaning, which was previously possible only with a chlorine-based cleaner or a flammable cleaner with a low flash point (high flammability). It was discovered that it can be washed even.

Further, it has been discovered that a nonflammable detergent can be used. That is, chlorine-based detergents are not preferable because they are highly toxic and have soil pollution, and one-stone (first petroleum) and two-stone (second petroleum) detergents are not preferable because they are highly flammable. (Third petroleum, flammable liquid with a flash point of 70 ° C or more and less than 200 ° C at room temperature) The following cleaning agents have low flammability, but are flammable and have drawbacks in terms of equipment and operation. However, the non-flammable detergent in the mixed state in which water is mixed with the above water-soluble solvent is the best because it does not catch fire.
The water-soluble solvent is not limited to the third petroleum, and includes the first petroleum and the second petroleum.

The term "quasi-water-based detergent" is a term in the field of cleaning, which is an intermediate of water-based detergents. The degreasing process uses a detergent, rinse is used with water, and drying is performed. Say something that uses warm air. Although it is rinsed with water like this, the cleaning agent is mainly composed of a solvent, and the rinsing process is not described in each of the above embodiments, but in the actual production process, the rinsing process is not described. It goes without saying that an appropriate rinsing step is required after the step.

On the other hand, if N-methyl-2-pyrrolidone is mixed with water to make it incombustible, it falls into the category of semi-aqueous detergent. In addition, whether resin cleaning can be done with a non-flammable cleaning agent,
However, what can be carried out is limited to a part thereof, and specific examples thereof include a mixture of N-methyl-2pyrrolidone and water described in the embodiment, or a glycol ether solvent such as 3-methyl-3-methoxybutanol. It is known that water is mixed with water.

A comparison table of the first to sixteenth embodiments described above is shown in the table of FIG. Comparative Example 1
The comparison table of ~ 11 is shown in the chart of FIG.

[0060]

As described above, according to the present invention,
Conventionally, resin stains etc. adhering to parts that could only be cleaned with chlorine-based solvents or flammable solvents with a low flash point,
It is possible to reduce the amount of chlorine-based solvents certified as environmentally destructive substances or to eliminate them by making it possible to wash and remove it by using tertiary oils with high flash points.

Further, there is an effect that the equipment can be constructed at a low cost by using a semi-aqueous detergent having a high flash point, and the safety of work can be secured.

[0062]

[Brief description of drawings]

FIG. 1 is a model diagram of a cleaning tank common to each embodiment of the present invention.

FIG. 2 is a table summarizing the weight change rates of the first to sixteenth embodiments.

FIG. 3 is a table summarizing the weight change rates of Comparative Examples 1 to 11.

[Explanation of symbols]

 1 1st tank 2 N methyl 2 pyrrolidone 3 Ultrasonic oscillating device 4 2nd tank 5 Shower 6 Cleaning object 7 Protective film

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihito Hosaka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (36)

[Claims] 1. A component cleaning method for removing an unnecessary protective film layer or resin stains attached to an object to be cleaned, wherein N-methyl-2pyrrolidone is used as a cleaning agent, and the N-methyl-2pyrrolidone is used in a dipping tank of a first tank. Ultrasonic cleaning treatment under the first condition, followed by shower cleaning treatment under the second condition using the N-methyl-2pyrrolidone in the shower tank of the second tank to remove the protective film layer or the resin stain. A method for cleaning parts, which is characterized in that 2. The component cleaning method according to claim 1, wherein the protective film layer is made of a water-resistant chloroprene rubber-based resin. 3. The method of cleaning a component according to claim 1, wherein the protective film layer is made of a water resistant vinyl acetate resin. 4. The component cleaning method according to claim 1, wherein the protective film layer is made of a water-resistant polyvinyl alcohol-based resin. 5. The first condition is that the immersion time in the immersion tank is 1 minute or more, and the temperature of the N-methyl-2pyrrolidone is 2 or more.
The frequency of ultrasonic wave generation is 20 to 100k above 0 ℃
hz, the output is 300 w or more, and the second condition is that the shower cleaning time is 1 minute or more,
The parts cleaning method according to claim 1, wherein the shower cleaning flow rate is 300 liters / hour or more and the outlet pressure is 1 kg / cm 2 or more. 6. The component cleaning method according to claim 1, wherein the object to be cleaned is a precision optical component such as a lens, a mirror or a prism having a predetermined outer shape and a predetermined dimension. 7. The cleaning agent used in a component cleaning device for removing an unnecessary protective film layer or resin stain adhered to an object to be cleaned is N as a cleaning agent.
Methyl 2 pyrrolidone was used, and the ultrasonic cleaning treatment with the N methyl 2 pyrrolidone was performed first in the immersion tank of the first tank.
A cleaning device for parts, characterized in that the shower cleaning process is performed under the following conditions, and a shower cleaning process is performed under the second condition using the N-methyl-2pyrrolidone in the shower chamber of the second subsequent chamber to remove the protective film layer or the resin stain. . 8. The component cleaning apparatus according to claim 7, wherein the protective film layer is made of a water-resistant chloroprene rubber resin. 9. The component cleaning apparatus according to claim 7, wherein the protective film layer is made of water resistant vinyl acetate resin. 10. The component cleaning apparatus according to claim 7, wherein the protective film layer is made of a water-resistant polyvinyl alcohol-based resin. 11. The first condition is that the immersion time in the immersion tank is 1 minute or more, the temperature of the N-methyl-2pyrrolidone is 20 ° C. or more, and the frequency of ultrasonic wave generation is 20 to 100.
khz or more, output is 300 w or more, and the second condition is that the shower cleaning time is 1 minute or more,
The parts cleaning apparatus according to claim 7, wherein the shower cleaning flow rate is 300 liters / hour or more and the outlet pressure is 1 kg / cm 2 or more. 12. The component cleaning apparatus according to claim 7, wherein the object to be cleaned is a precision optical component such as a lens, a mirror, a prism having a predetermined outer shape and a predetermined dimension. 13. N-methyl-2pyrrolidone is used as a cleaning agent in a part from which an unnecessary protective film layer or resin stain attached to an object to be cleaned is removed, and the N-methyl-2pyrrolidone is used as a cleaning agent in the first tank dipping tank. A sonic cleaning process is performed under the first condition, and then a shower cleaning process is performed under the second condition using the N-methyl-2pyrrolidone in the second shower chamber to remove the protective film layer or the resin stain. Characteristic parts. 14. The component according to claim 13, wherein the protective film layer is made of a water-resistant chloroprene rubber-based resin. 15. The component according to claim 13, wherein the protective film layer is made of a water resistant vinyl acetate resin. 16. The component according to claim 13, wherein the protective film layer is a polyvinyl alcohol resin diluted to a predetermined concentration with water-resistant ethyl acetate. 17. The first condition is that the immersion time in the immersion tank is 1 minute or more, the temperature of the N-methyl-2pyrrolidone is 20 ° C. or more, and the frequency of ultrasonic wave generation is 20 to 100.
khz, output is 300 w or more, and the second condition is that the shower cleaning time is 2 minutes or more,
14. The component according to claim 13, wherein the shower washing flow rate is 300 liters / hour or more and the outlet pressure is 1 kg / cm @ 2 or more. 18. The component according to claim 13, wherein the object to be cleaned is a precision optical component such as a lens, a mirror or a prism having a predetermined outer shape and a predetermined dimension. 19. A component cleaning method for removing an unnecessary protective layer or resin stain attached to an object to be cleaned, wherein a nonflammable cleaning agent is used as a cleaning agent, and ultrasonic waves generated by the nonflammable cleaning agent are used in the first immersion tank. The cleaning treatment is performed under the first condition, and then the shower cleaning treatment is performed under the second condition in the shower tank of the second tank using the nonflammable cleaning agent to remove the protective layer or the resin stain. How to clean parts. 20. The part cleaning according to claim 19, wherein the non-flammable cleaning agent is a cleaning agent in which water is mixed with a water-soluble combustible solvent to make the property of the mixed solution non-combustible. Method. 21. The component cleaning method according to claim 19, wherein the protective layer is a water-resistant chloroprene-based resin. 22. The component cleaning method according to claim 19, wherein the protective layer is a water-resistant vinyl acetate resin. 23. The component cleaning method according to claim 19, wherein the protective layer is made of a water-resistant polynyl alcohol resin. 24. The component cleaning method according to claim 19, wherein the object to be cleaned is an optical component having a predetermined outer shape and a predetermined dimension, such as a lens, a mirror or a prism. 25. In a component cleaning apparatus for removing unnecessary protective layers or resin stains adhered to an object to be cleaned, a nonflammable cleaning agent is used as the cleaning agent, and ultrasonic waves generated by the nonflammable cleaning agent are used in the first immersion tank. The cleaning treatment is performed under the first condition, and then the shower cleaning treatment is performed under the second condition in the shower tank of the second tank using the nonflammable cleaning agent to remove the protective mark layer or the resin stain. Parts cleaning equipment. 26. The component according to claim 25, wherein the nonflammable cleaning agent is a cleaning agent in which water is mixed with a water-soluble combustible solvent to make the property of the mixed solution nonflammable. Cleaning device. 27. The component cleaning apparatus according to claim 25, wherein the protective film layer is made of a water-resistant chloroprene-based resin. 28. The component cleaning apparatus according to claim 25, wherein the protective film layer is made of water resistant vinyl acetate resin. 29. The component cleaning apparatus according to claim 25, wherein the protective layer is a water-resistant polyvinyl alcohol-based resin. 30. The component cleaning apparatus according to claim 25, wherein the object to be cleaned is an optical component such as a lens, a mirror, a prism having a predetermined outer shape and a predetermined dimension. 31. In a component from which an unnecessary protective layer or resin stain attached to an object to be cleaned is removed, a nonflammable cleaning agent is used as a cleaning agent, and ultrasonic treatment is performed by the nonflammable cleaning agent in the first immersion tank. Is carried out under the first condition, and in the subsequent shower tank of the second tank, the shower cleaning treatment is carried out under the second condition using the nonflammable cleaning agent to remove the protective layer or the resin stain. parts. 32. The component according to claim 31, wherein the non-combustible cleaning agent is a cleaning agent in which water is mixed with a water-soluble combustible solvent to make the mixed solution non-combustible. 33. The component according to claim 31, wherein the protective layer is a water-resistant chloroprene-based resin. 34. The component according to claim 31, wherein the protective layer is a water resistant vinyl acetate resin. 35. The component according to claim 31, wherein the protective layer is a water-resistant polyvinyl alcohol-based resin. 36. The component according to claim 31, wherein the article to be cleaned is an optical article such as a lens, a mirror or a prism having a predetermined outer shape and dimensions.