JPH08134229A - Adhesion method for rubber material members - Google Patents

Abstract

PURPOSE: To tenaciously bond a rubber material member to an adherend member with an adhesive. CONSTITUTION: A surface of a rubber material member 1 is irradiated for a certain period with ultraviolet containing light having wavelengths of 184nm and 254nm. The irradiated surface (adhesion surface 1C) is bonded to an adherend member 2 with an adhesive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive method for adhering a rubber material member formed of a rubber material to an adherend member via an adhesive, and is used, for example, for maintaining airtightness between both joint surfaces. It is used for bonding an O-ring to be bonded into an O-ring groove that is recessed in one joint surface.

[0002]

2. Description of the Related Art Conventionally, when a rubber material member is adhered to an adherend member via an adhesive, in order to effectively obtain the adhesive strength of the adhesive, fine foreign matter or oil content attached to the surface of the rubber material member is used. It had to be removed before bonding. The foreign substances adhered to these surfaces adhered during the storage and transportation of the rubber material member after manufacturing, while the oil content adhered during the molding of the rubber material member by the mold. (Foreign matter and oil are referred to as adherents) Then, as a general method for removing these adherents, the rubber material member is immersed in a cleaning solution in which a chemical is dissolved to clean its surface, and then the rubber material member is cleaned with a cleaning solution. It is taken out into the atmosphere and dried.

[0003]

The conventional method has the following problems. Since it is a treatment with a chemical solution (cleaning solution), there are items that must be controlled, such as control of chemical concentration and immersion time. This is because, if this control item is not properly implemented, the removal of adhered substances on the surface of the rubber material member becomes uneven, and good adhesive strength by the adhesive cannot be obtained. According to the above, such cleaning work requires skill. When the rubber material member is immersed in the cleaning liquid and then taken out to the atmosphere, the rubber material member is in a state of being wet by the cleaning liquid, and it is necessary to dry the rubber material member by blowing air or putting it in a constant temperature bath. There is. As described above, the need for the drying step is not preferable because it increases the time required for the step of adhering the rubber material member including the washing step and increases the manufacturing cost.

The present invention has been made in view of the above problems, and it is possible to extremely easily and surely remove deposits adhering to the surface of a rubber material member, and to separate the rubber material member and the adherend member by an adhesive agent. Another object of the present invention is to obtain a bonding method for a rubber material member capable of sufficiently increasing the bonding strength.

[0005]

In order to achieve the above object, the present invention provides a surface of a rubber material member made of a rubber material with ultraviolet rays containing light of wavelength 184 nanometers and light of wavelength 254 nanometers for a certain period of time. Irradiation is performed, and the irradiation surface of the rubber material member is adhered to the adherend member via an adhesive.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for adhering a rubber material member of the present invention will be described below with reference to FIG. Reference numeral 1 denotes an example of a rubber material member, which includes a flat portion 1A and an annular ring 1B protruding upward from the upper surface of the flat portion 1A.
The upper surface of B was used as an adhesive surface 1C with a member to be adhered (not shown).
(This shape is a shape selected in order to make it easy to confirm the tensile strength with an adhesive described later, and the shape is not limited to this.) The rubber material forming this rubber material member 1 is nitrile rubber, It is composed of a synthetic rubber such as silicone rubber or fluororubber, a thermoplastic elastomer such as a polyolefin thermoplastic elastomer, a polyethylene thermoplastic elastomer, or a vinyl chloride thermoplastic elastomer.

The adhesive surface 1C of the rubber material member 1
UV light including a light having a wavelength of 184 nanometers and a light having a wavelength of 254 nanometers is irradiated for a certain time. 1 above
Ultraviolet light containing 84 nanometer light and 254 nanometer light is obtained by using a synthetic quartz low-pressure mercury lamp.

By irradiating the adhesive surface 1C with ultraviolet rays, the adhesive surface 1C undergoes reforming and cleaning of the deposits.

The modification of the adhesive surface 1C is performed by the following. The ultraviolet energy of a low-pressure mercury lamp that emits wavelengths of 254 nanometers and 184 nanometers has a light energy of 647 (kJ / mol) at a wavelength of 184 nanometers and 471 (kJ / mol) at a wavelength of 254 nanometers.
Has light energy of. On the other hand, the binding energies of typical organic compounds are as shown in the table below.

[Table 1]

Thus, when the organic compound is irradiated with light energy having an energy equal to or higher than the binding energy of the organic compound and the organic compound absorbs the high energy, the bond of the organic compound is broken,
Mainly hydrogen atoms are extracted and an oxide film is formed on the irradiation surface (in other words, the adhesion surface 1C). This is reforming.

The oxide film formed on the adhesive surface 1C improves the adhesiveness of the adhesive. This is because the molecules of the rubber in the unsaturated state of the adhesive surface 1C due to oxidation and the molecules of the adhesive bond with each other.

Further, the oxide film on the adhesive surface 1C is intended to improve the adhesiveness because the metal (for example, iron, which has a high oxide film forming rate) can be formed.
Excellent adhesion of copper, etc., poor adhesion of metals with slow oxide film formation rate (eg aluminum, stainless steel), and corrosion of these poorly adherent metals with acids, alkalis, etc. It is also clear from the fact that the adhesiveness can be improved by forming the oxide film by the above method.

On the other hand, the deposit on the adhesive surface 1C is washed by the following. The high energy of ultraviolet rays is absorbed by an organic compound to break the bond of molecules, and at the same time, ozone is generated by the following reaction. O2 + UV of 184 nanometer wavelength → O + O O2 + O → O3 O3 + UV of 254 nanometer wavelength → O2 + O According to the generation of this ozone, the organic compound is strongly oxidized and the progress of this oxidation reaction causes Organic compounds are also finally decomposed into CO2, H2O, and N2 and scattered in the atmosphere. At this time, adhered substances (for example, human oil, mold release agent, resin additive) adhered to the adhesive surface 1C. , Flux, wax, cutting oil, lubricating oil, engine oil, solvent, steam) are simultaneously scattered and removed.

As described above, by irradiating the adhesive surface 1C of the rubber material member 1 with ultraviolet rays containing light of wavelength 184 nanometers and wavelength 254 nanometers for a certain period of time, an oxide film is formed on the adhesive surface 1C. According to the fact that the adhering matter attached to the adhering surface 1C is removed and washed, the adhesive strength between the adhering surface 1C and the adherend member can be further strengthened through the adhesive. .

This was confirmed by the tensile strength test device shown in FIG. That is, as described above, the adhesive surface 1C of the rubber material member 1 is irradiated with the ultraviolet rays including the light of the wavelength 184 nanometer and the light of the wavelength 254 nanometer for a certain period of time, and the adhesive surface 1C is adhered to the adhered member 2 through the adhesive. It On the other hand, the flat portion 1A of the rubber material member 1 is sandwiched and fixed by the fixing jig 3. Then, in such a state, the adherend member 2 is pulled upward, and the tensile strength between the adhesion surface 1C and the adherend member 2 is measured.

The test results obtained by the above tensile strength tester are shown in FIG. 2. According to these results, the tensile strength increase rate varies depending on the rubber material, but the tensile strength increases relatively. Was confirmed. Further, the tensile strength changes depending on the ultraviolet irradiation time. For example, in the case of fluororubber, the irradiation time is preferably 60 seconds.

[0017]

As described above, according to the method for adhering a rubber material member according to the present invention, the rubber material member is irradiated with ultraviolet rays containing light of 184 nanometers and 254 nanometers for a certain period of time to modify and clean the surface. Since the irradiation surface is adhered to the adherend member via the adhesive, the adhesion strength thereof can be further strengthened.
Further, the above-mentioned ultraviolet rays can be obtained by using a low-pressure mercury lamp, and the management can be performed only by controlling the irradiation time of the low-pressure mercury lamp. Therefore, it is possible to reduce the management man-hours and achieve uniform bonding without any skill. It was something that could be done without any need. Further, since the rubber material member is always placed in the atmosphere, it does not require a drying step as in the conventional case. Therefore, the number of bonding steps can be reduced,
Therefore, the reduction of manufacturing cost was achieved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a rubber material member and an apparatus for measuring the tensile strength of the rubber material member.

FIG. 2 is a diagram showing the relationship between the tensile strength and the ultraviolet irradiation time of the rubber material member according to the present invention.

[Explanation of symbols]

 1 Rubber material member 1C Adhesive surface

Claims (1)

[Claims] 1. A light having a wavelength of 184 nanometers and a wavelength of 254 are formed on the surface of a rubber material member formed of a rubber material.
A method for adhering a rubber material member, which comprises irradiating an ultraviolet ray containing nanometer light for a certain period of time and adhering an irradiation surface of the rubber material member to an adhered member via an adhesive.