CN116855146A - Strippable coating with strong room temperature oxidant resistance, manufacturing method and coating structure - Google Patents

Abstract

The application provides a room-temperature strong-oxidant-resistant strippable coating, a manufacturing method and a coating structure, wherein the room-temperature strong-oxidant-resistant strippable coating comprises the following components: SBS resin: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: mixing the mass ratio of N to obtain first mixed raw rubber and second mixed raw rubber with different components; the first mixed raw rubber is prepared into first raw rubber through thin pass, sheet falling and back refining, and the first raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, preparing a first coating; the second mixed raw rubber is prepared into second raw rubber through thin pass, sheet falling and back mixing, and the second raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, preparing a second coating; the technical scheme of the application effectively solves the problems that the paint in the prior art needs to be cured by heating and has weak oxidation resistance.

Description

Peelable coating resistant to strong oxidants at room temperature, production method and coating structure

Technical field

The present invention relates to the technical field of coatings. Specifically, it relates to a strippable coating that is resistant to strong oxidants at room temperature, a production method and a coating structure.

Background technique

The chemical milling process is to coat the entire surface of the metal part with a peelable protective coating. After the coating is cured, it is carved according to the design pattern, and then the protective coating is removed from the parts to be processed, and then the corresponding chemical milling etching liquid is put in Processing technology for medium corrosion forming.

In the aerospace field, many large parts are formed using chemical milling processes, such as liquid rocket tanks, melon segments, and covers, satellite instrument brackets, and panels, etc. The chemical milling process plays an extremely important role in reducing the structural quality of components, increasing range, and improving carrying capacity.

Peelable protective coatings mainly provide temporary anti-corrosion protection for non-machined surfaces of metal parts during the chemical milling process. This kind of coating must not only be resistant to high-temperature chemical corrosion, but also have good elastic-plasticity, easy engraving, good air tightness, appropriate etching ratio, and ensure the straightness of the trimmed edges. In addition, in order to avoid When chemical milling is carried out for a long time, a peeling phenomenon will occur. The bonding strength and peelability of the coating and the base material must be properly balanced. Therefore, peelable protective coating is a key material to ensure high-quality forming of chemical milled parts.

Currently, there are natural rubber-based water-based peelable protective coatings in China, but they require heating and curing; there are also butyl rubber-based acid and alkali-resistant generally peelable protective coatings. However, according to the type of chemical milling metal, it is divided into acid corrosion, alkali corrosion and oxidative acid corrosion. In terms of the resistance of protective coatings, oxidative acid corrosion is far more severe than acid and alkali corrosion. many.

Contents of the invention

The invention provides a strippable coating that is resistant to strong oxidants at room temperature, a production method and a coating structure, and solves the problems in the prior art that the coating needs to be heated and cured and has poor oxidation resistance.

According to the present invention, a strippable coating that is resistant to strong oxidants at room temperature is provided, which includes: SBS resin: phenolic resin: filler: auxiliary, and the mass ratio is 100: 10-20: 75-100: N for mixing. The first mixed original gum and the second mixed original gum with different components are mixed out; the first mixed original gum is made into the first original gum through thinning, cutting, and re-refining. The first original gum: solvent: The mass ratio of the additives is 100:200-230:2-5 to prepare the first coating; the second mixed raw rubber is made into the second raw rubber through thin pass, sheet removal and re-refining. The second raw rubber: solvent: The mass ratio of additives is 100:200-230:2-5 to prepare the second coating; the solid content of the first coating and the second coating is greater than 30%, and the viscosity is not less than 2000mPa·S, and after curing at room temperature for 24 hours, the The elongation at break is not less than 600%, and after being soaked in acid or alkali liquid, the elongation at break is reduced by no more than 50%. After the coating is cured at room temperature, the use temperature can reach 100°C.

According to another aspect of the present invention, there is also provided a method for making a strippable coating that is resistant to strong oxidants at room temperature, including the following steps: S10: SBS resin: phenolic resin: filler: additive mass ratio is 100: 10-20 : 75-100: N is mixed to form the first mixed raw rubber and the second mixed raw rubber with different components; S20 is made by thinning the first mixed raw rubber, cutting it, and re-refining it. The first raw rubber and the second mixed raw rubber are made into the second raw rubber through thin pass, sheet removal and re-refining; S30 sets the mass ratio of the first raw rubber: solvent: auxiliary to 100: 200-230: 2- 5 is dissolved and dispersed to form the first coating, and the mass ratio of the second original gum:solvent:auxiliary is 100:200-230:2-5. Dissolve and disperse it to form the second coating.

Furthermore, the grades of SBS resin are 1401 and 1201, the grade of phenolic resin is 2401, and the filler is magnesium silicate; the additives include accelerators and pigments.

Further, in S20, the SBS resin: phenolic resin: magnesium silicate: accelerator: pigment is 100: 10-20: 75-100: 1.5-2.0: 0.1-0.5; the mixing adopts the open mixing mode, according to the above formula sequence Add in sequence; cut the left and right knives no less than 8 times during mixing.

Further, in S20, the roller distance is M when thin passing, the roller distance when unloading is N, and the roller distance is P when returning to refining, then the roller distance value should be set as: P>M>N, and P is generally Not greater than 2.5mm, N is generally not less than 0.5mm.

Further, in step S30, first add the solvent in the stirring tank according to the mass ratio of the first original gum or the second original gum: solvent: additive mass ratio of 100: 200-230: 2-5, and then add the original film; After the film is dissolved, disperse it. The dispersion time is not less than 32 hours, and the rotation speed is not less than 960r/min. After the dispersion is completed, add the accelerator, and then disperse it for not less than 4 hours. After the preparation is completed, filter the material and test the solid content, viscosity, Elongation at break; it can only be used after passing the test.

Further, the solvent is toluene or tetrachlorethylene, and the auxiliary agent is an accelerator.

Further, in step S40, when the paint is used, the surface to be coated needs to be sand blown or polished, solvent degreasing and other operations are required to keep the surface clean.

Furthermore, the thickness of the primer, transition layer, and surface layer is controlled at 0.08mm-0.15mm. Each layer needs to be sprayed, dipped or brushed multiple times to ensure the thickness of each layer. The intervals between two adjacent operations should be left to dry. The time is about 20 minutes, and the total thickness after the three-layer construction is about 0.24mm-0.45mm. After the coating is completed, leave it at room temperature for 24 hours. According to actual needs, you can choose to directly proceed with subsequent operations, or keep it warm for 2 hours at 100°C. Follow up.

According to another aspect of the present invention, a coating structure is also provided, which sequentially includes a base material, a bottom layer, a transition layer and a surface layer. The bottom layer and the surface layer are sprayed with a first paint, and the transition layer is sprayed with a second paint. The first paint is the above-mentioned first paint, and the second paint is the above-mentioned second paint.

Applying the technical solution of the present invention, the mass ratio of SBS resin: phenolic resin: filler: auxiliary is 100: 10-20: 75-100: N for mixing, and then goes through a series of thin passes, sheeting, and back-refining. The tools are used to make the first coating and the second coating. The first coating and the second coating are used in different coatings of the same coating protection structure, which can effectively improve the density, adhesion and other properties. The technical solution of the present invention effectively solves the problems in the prior art that the coating needs to be heated for curing and has poor oxidation resistance.

Description of the drawings

The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the present disclosure are shown by way of illustration and not limitation, and like or corresponding reference numerals designate like or corresponding parts, wherein:

Figure 1 shows a schematic diagram of the coating structure of the present application;

Figure 2 shows a schematic diagram of the test curve after room temperature curing in Figure 1;

Figure 3 shows a schematic diagram of the test curve of Figure 1 after being soaked in a strong oxidant;

Detailed ways

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meanings commonly understood by one of ordinary skill in the art to which this application belongs.

For the convenience of description, spatially relative terms can be used here, such as "on...", "on...", "on the upper surface of...", "above", etc., to describe what is shown in the figure. The spatial relationship between one device or feature and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a feature in the figure is turned upside down, then one feature described as "above" or "on top of" other features or features would then be oriented "below" or "below" the other features or features. under other devices or structures". Thus, the exemplary term "over" may include both orientations "above" and "below." The device may be otherwise oriented, rotated 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

Now, exemplary embodiments according to the present disclosure will be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of these exemplary embodiments to those skilled in the art, and in the drawings, the layers are exaggerated for clarity. and the thickness of the region, and the same reference numerals are used to denote the same devices, and thus their descriptions will be omitted.

As shown in Figures 1 to 3, the room temperature strong oxidant-resistant peelable coating of the present application includes: SBS resin: phenolic resin: filler: additive mass ratio is 100: 10-20: 75-100: N for mixing Knead the first mixed raw gum and the second mixed raw gum with different components. The first mixed raw rubber is made into the first raw rubber through thin pass, sheet removal and re-refining. The mass ratio of the first raw rubber: solvent: auxiliary is 100: 200-230: 2-5 to prepare the first coating. The second mixed raw rubber is made into the second raw rubber through thin pass, sheet removal and re-refining. The mass ratio of the second raw rubber: solvent: auxiliary is 100: 200-230: 2-5 to prepare the second coating. The solid content of the first coating and the second coating is greater than 30%, and the viscosity is not less than 2000mPa·S. After curing at room temperature for 24 hours, the tensile elongation is not less than 600%, and the tensile elongation is not less than 600% after being soaked in acid or alkali solution. The elongation is reduced by no more than 50%, and after the coating is cured at room temperature, the service temperature can reach 100°C.

Applying the technical solution of this application, the mass ratio of SBS resin: phenolic resin: filler: auxiliary is 100: 10-20: 75-100: N for mixing, and then goes through a series of thin passes, sheeting, and back-refining. The tools are used to make the first coating and the second coating. The first coating and the second coating are used in different coatings of the same coating protection structure, which can effectively improve the density, adhesion and other properties. The technical solution of the present application effectively solves the problems in the prior art that coatings require heating for curing and have poor oxidation resistance.

This application also provides a method for preparing a paint, a method for making a strippable paint that is resistant to strong oxidants at room temperature, and is characterized in that it includes the following steps:

S10 mixes SBS resin:phenolic resin:filler:auxiliary at a mass ratio of 100:10-20:75-100:N, and mixes it into a first mixing raw material and a second mixing raw material with different components. glue;

S20: The first mixed raw rubber is made into the first raw gum through thin passing, sheeting and re-refining, and the second mixed raw rubber is made into the second raw rubber through thin passing, sheeting and back-refining;

S30 dissolves and disperses the first raw rubber: solvent: auxiliary agent in a mass ratio of 100: 200-230: 2-5 into the first coating, and dissolves the second raw rubber: solvent: auxiliary agent in a mass ratio of 100: 200- 230:2-5 dissolves and disperses as a second coating.

In the technical solution of this application, the grades of SBS resin are 1401 and 1201, the grade of phenolic resin is 2401, and the filler is magnesium silicate; the additives include accelerators and pigments. The above materials are easy to obtain and the coatings produced have good performance.

In the technical solution of this application, in S20, the SBS resin: phenolic resin: magnesium silicate: accelerator: pigment is 100: 10-20: 75-100: 1.5-2.0: 0.1-0.5; the mixing mode is open. , add in the order of the above formula; when mixing, cut the left and right knives no less than 8 times. The coating produced by the above processing steps has good performance and can meet the requirements of aerospace device processing.

In the technical solution of this application, in S20, the roller distance is M when thin passing, the roller distance when unloading is N, and the roller distance is P when returning to refining, then the roller distance value should be set as: P>M> N, and P is generally not greater than 2.5mm, and N is generally not less than 0.5mm. The above roller distance value has better processing effect.

In the technical solution of this application, in step S30, the solvent is first added into the stirring tank at a mass ratio of first original gum or second original gum: solvent: auxiliary agent of 100:200-230:2-5, Then add the original film; after the film is dissolved, disperse it, the dispersion time is not less than 32h, and the rotation speed is not less than 960r/min; after the dispersion is completed, add the accelerator, and then disperse it for not less than 4h; after the preparation is completed, filter out the material and test Solid content, viscosity, and elongation at break; it can only be used after passing the test. The coating effect processed by the above processing steps is better.

In the technical solution of this application, the solvent is toluene or tetrachlorethylene, and the auxiliary agent is an accelerator. In this way, there will be no interference from other factors during processing, such as bubbles.

In the technical solution of this application, in step S40, when the paint is used, the surface to be coated needs to be sand blown or polished, solvent degreasing and other operations are required to keep the surface clean. This way the coating effect is better and less likely to fall off.

In the technical solution of this application, the thickness of the primer, transition layer, and surface layer is controlled at 0.08mm-0.15mm. Each layer needs to be sprayed, dipped or brushed multiple times to ensure the thickness of each layer, two consecutive times. The operation interval, that is, the drying time, is about 20 minutes. The total thickness after three layers of construction is about 0.24mm-0.45mm. After the coating is completed, after leaving it at room temperature for 24 hours, according to actual needs, you can choose to directly carry out subsequent operations, or under 100°C conditions. , keep warm for 2 hours before proceeding with subsequent operations. This kind of coating has better anti-oxidation and anti-corrosion effects.

This application also provides a paint protection structure, which sequentially includes a base material, a bottom layer, a transition layer and a surface layer. The bottom layer and the surface layer are sprayed with a first paint, and the transition layer is sprayed with a second paint. The first paint is the above-mentioned The first paint and the second paint are the above-mentioned second paint. In this way, coating can be carried out as needed. For example, the outermost layer requires dense coating, which can effectively prevent corrosive media from corroding the base material or oxidizing the base material during processing.

In summary, it can be seen that a multi-layer room temperature curing peelable protective coating that is resistant to strong oxidants is prepared and applied. Through research on the ratio and mixing process of peelable protective coatings, a peelable protective coating with moderate bonding force and peelability between primer and substrate, resistance to oxidants, and room temperature curing was developed; through the design of protective layers with different functions and compatible technology research, and propose a simple and practical construction technology method.

The preparation and application method of a multi-layer room temperature curing peelable protective coating that is resistant to strong oxidants is mainly achieved through the following technical solutions.

1) A peelable protective coating that is cured at room temperature and resistant to strong oxidants. Its characteristics are: the solid content of the coating is greater than 30%; the viscosity is not less than 2000mPa·S; after curing at room temperature for 24 hours, the elongation at break is not less than 600%; After being soaked in acid or alkali liquid, the elongation at break will be reduced by no more than 50%; after the coating is cured at room temperature, the service temperature can reach 100°C.

2) An application method of multi-layer peelable protective coating, its characteristics are: a three-layer structure of bottom layer - transition layer - surface layer, the thickness of each layer is controlled at 0.08 ~ 0.15mm; the construction process is simple, no complicated equipment is required, and spraying is used , dipping and brushing processes are available.

3) A method for preparing and applying a multi-layer room temperature curing peelable protective coating that is resistant to strong oxidants, including the following steps:

Step S1 is a preparation process for a multi-layer room temperature curing peelable protective coating that is resistant to strong oxidants. The raw materials are composed of SBS resin, phenolic resin, fillers and additives.

Step S2: Mix SBS resin:phenolic resin:filler:auxiliary in a mass ratio of 100:10~20:75~100:N to form two-component mixed raw gum 1 and 2.

In step S3, the mixed raw rubber 1 and 2 obtained in S2 are thinned, cut into sheets, and re-melted to make raw rubber sheets 1 and 2.

In step S4, the original film obtained in S3 is made into a peelable protective coating, and the original gum is dissolved and dispersed at high speed according to the mass ratio of original film 1 or 2: solvent: additive of 100:200~230:2~5.

Step S5, use the paint prepared from the original film 1 as the primer and topcoat, use the paint prepared from the original film 2 as the transition layer, and apply the prepared paint on the front by spraying, dipping, or brushing. For the treated surface to be coated, control the drying time and thickness of each layer, and then choose to cure at room temperature for more than 24 hours or heat curing according to actual usage conditions. After curing is completed, follow-up operations can be carried out.

Further, the SBS grades mentioned in step S1 are 1401 and 1201. This system glue has the advantages of good tensile strength, elasticity, air permeability, temperature resistance and good mixing characteristics; the selected grade of phenolic resin is 2401; the filler is silicon Magnesium acid; additives include accelerators and pigments.

Further, the mass ratio of the additives in step S2 includes: SBS resin (1401, 1201): phenolic resin: magnesium silicate: accelerator and pigment: 100: 10 ~ 20: 75 ~ 100: 1.5 ~ 2.0: 0.1 ~ 0.5 ; Use the open mixing mode for mixing, and add it in sequence according to the above formula; the left and right cutters should be cut no less than 8 times during mixing.

Further, as described in step S3, the roller distance is M when thin passing, the roller distance is N when unloading, and the roller distance is P when refining, then the roller distance value should be set as: P>M>N, and P Generally not greater than 2.5mm, N is generally not less than 0.5mm.

Further, the solvent in step S4 is toluene or tetrachlorethylene, and the auxiliary agent is an accelerator. First add the solvent into the stirring kettle according to the mass ratio of original film 1 or 2: solvent: additive of 100: 200 ~ 230: 2 ~ 5, and then add the original film; after the film is dissolved, perform high-speed dispersion, and the dispersion time is not less than 32h, the rotation speed is not less than 960r/min; after the dispersion is completed, add accelerator and disperse for not less than 4h. After the preparation is completed, the material is filtered and the solid content, viscosity, elongation at break and other properties are tested. It can only be used after passing the test.

Further, as described in step S5, when the paint is used, the surface to be coated needs to be sand blown or polished, solvent degreasing and other operations are required to keep the surface clean. The thickness of primer, transition layer and surface layer is controlled at 0.08~0.15mm. Generally, each layer needs to be sprayed, dipped or brushed twice to ensure the thickness of each layer. The interval between two operations, that is, the drying time, is about 20 minutes. The total thickness after three layers of construction is about 0.24~0.45mm. After the coating is completed, leave it at room temperature for 24 hours. Depending on actual needs, you can choose to proceed directly with the subsequent operation, or at 100°C, keep it warm for 2 hours before proceeding with the subsequent operation.

The solid content of the peelable protective coating prepared by the present invention is tested according to GB1725-2007, and the solid content is not less than 30%; the viscosity is tested according to GB2794-2013, and the viscosity is not less than 2000mPa·S or not less than 300s; the tensile elongation is tested according to GB528-2009 Elongation, after curing at room temperature for 24 hours, the elongation at break is not less than 600%; after being soaked in acid or alkali solution, the elongation at break is reduced by no more than 50%.

The currently reported peelable protective coatings are water-based natural rubber. The workpiece needs to be heated during coating. After the surface is dry, it still needs to be heated and cured to achieve the desired performance. This operation is relatively cumbersome for larger workpieces. The peelable protective coating prepared by the present invention can not only achieve room temperature curing, but the three-layer structure design also takes into account the balance between the bonding force and peelability between the base material and the coating, while ensuring the density and hardness of the coating, so that The coating has good milling straightness, acid resistance, alkali resistance and strong oxidant resistance. It can be widely used for chemical milling protection of aluminum alloy, titanium alloy, stainless steel and other workpieces.

beneficial effects

In this application, by conducting research on the ratio and mixing process of peelable protective coatings, a peelable protective coating with moderate bonding force and peelability between primer and substrate, resistance to oxidants, and room temperature curing was developed. The preparation process of this coating is simple, safe and easy to operate, and easy to achieve mass production; the research results can be widely used in aerospace, mechanical processing, electronics industry, electroplating, anodizing and other fields. The construction process is simple and practical, greatly improving production efficiency .

Specific examples are:

Example 1 is used to describe in detail the preparation and strong oxidant resistance performance of the room temperature curing peelable protective coating that is resistant to strong oxidants provided in this application.

Example 1 Preparation of a room temperature curing peelable protective coating that is resistant to strong oxidants, including the following steps:

Step S1 is a process for preparing a peelable protective coating that is cured at room temperature and resistant to strong oxidants. Its raw materials consist of SBS resin, phenolic resin, fillers and additives.

Step S2: Mix SBS resin: phenolic resin: filler: auxiliary agent at a mass ratio of 100: 10 to 20: 75 to 100: N to form two-component mixed raw gums 1 and 2 (No. The first mixed raw gum and the second mixed raw gum).

In step S3, the mixed raw gums 1 and 2 obtained in S2 are thinned, cut into sheets, and re-melted to form raw rubber sheets 1 and 2 (the first raw gum and the second raw gum).

In step S4, the original film obtained in S3 is made into a peelable protective coating, and the original gum is dissolved and dispersed at high speed according to the mass ratio of original film 1 or 2: solvent: auxiliary of 100:200-230:2-5.

Further, the SBS grades mentioned in step S1 are 1401 and 1201. This system glue has the advantages of good tensile strength, elasticity, air permeability, temperature resistance and good mixing characteristics; the selected grade of phenolic resin is 2401; the filler is silicon Magnesium acid; additives include accelerators and pigments.

Further, the mass ratio of the additives in step S2 includes: SBS resin (1401, 1201): phenolic resin: magnesium silicate: accelerator and pigment: 100: 10-20: 75-100: 1.5-2.0: 0.1-0.5 ; Use the open mixing mode for mixing, and add it in sequence according to the above formula; the left and right cutters should be cut no less than 8 times during mixing.

Further, as described in step S3, the roller distance is M when thin passing, the roller distance is N when unloading, and the roller distance is P when refining, then the roller distance value should be set as: P>M>N, and P Generally not greater than 2.5mm, N is generally not less than 0.5mm.

Further, the solvent in step S4 is toluene or tetrachlorethylene, and the auxiliary agent is an accelerator. First, add the solvent into the stirring tank according to the mass ratio of original film 1 or 2: solvent: additive of 100:200-230:2-5, and then add the original film; after the film is dissolved, perform high-speed dispersion, and the dispersion time is not less than 32h, the rotation speed is not less than 960r/min; after the dispersion is completed, add accelerator and disperse for not less than 4h. After the preparation is completed, the material is filtered and the solid content, viscosity, elongation at break and other properties are tested. It can only be used after passing the test.

After being cured at room temperature for 24 hours, the strong oxidant-resistant peelable protective coating prepared in Example 1 has an elongation at break of not less than 600%; after being soaked in a strong oxidant, the elongation at break is reduced by no more than 50%. Tested in accordance with GB528-2009, it meets the requirements; after being soaked in a strong oxidant for 15 minutes, its peelability is good. The tensile elongation test curve is shown in Figure 2.

The preparation and application method of a multi-layer room temperature curing peelable protective coating that is resistant to strong oxidants provided by the present invention is explained in detail through Example 2.

Embodiment 2, a method for preparing and applying a multi-layer room temperature curing peelable protective coating that is resistant to strong oxidants, includes the following steps.

Step S1 is a preparation process for a multi-layer room temperature curing peelable protective coating that is resistant to strong oxidants. The raw materials are composed of SBS resin, phenolic resin, fillers and additives.

Step S2: Mix SBS resin:phenolic resin:filler:auxiliary at a mass ratio of 100:10-20:75-100:N to form two-component mixed raw rubber 1 and 2.

In step S3, the mixed raw rubber 1 and 2 obtained in S2 are thinned, cut into sheets, and re-melted to make raw rubber sheets 1 and 2.

In step S4, the original film obtained in S3 is made into a peelable protective coating, and the original gum is dissolved and dispersed at high speed according to the mass ratio of original film 1 or 2: solvent: auxiliary of 100:200-230:2-5.

Step S5, use the paint prepared from the original film 1 as the primer and topcoat, use the paint prepared from the original film 2 as the transition layer, and apply the prepared paint on the front by spraying, dipping, or brushing. For the treated surface to be coated, control the drying time and thickness of each layer, and then choose to cure at room temperature for more than 24 hours or heat curing according to actual usage conditions. After curing is completed, follow-up operations can be carried out.

Further, the SBS grades mentioned in step S1 are 1401 and 1201. This system glue has the advantages of good tensile strength, elasticity, air permeability, temperature resistance and good mixing characteristics; the selected grade of phenolic resin is 2401; the filler is silicon Magnesium acid; additives include accelerators and pigments.

Further, the mass ratio of the additives in step S2 includes: SBS resin (1401, 1201): phenolic resin: magnesium silicate: accelerator and pigment: 100: 10-20: 75-100: 1.5-2.0: 0.1-0.5 ; Use the open mixing mode for mixing, and add it in sequence according to the above formula; the left and right cutters should be cut no less than 8 times during mixing.

Further, as described in step S3, the roller distance is M when thin passing, the roller distance is N when unloading, and the roller distance is P when refining, then the roller distance value should be set as: P>M>N, and P Generally not greater than 2.5mm, N is generally not less than 0.5mm.

Further, the solvent in step S4 is toluene or tetrachlorethylene, and the auxiliary agent is an accelerator. First, add the solvent into the stirring tank according to the mass ratio of original film 1 or 2: solvent: additive of 100:200-230:2-5, and then add the original film; after the film is dissolved, perform high-speed dispersion, and the dispersion time is not less than 32h, the rotation speed is not less than 960r/min; after the dispersion is completed, add accelerator and disperse for not less than 4h. After the preparation is completed, the material is filtered and the solid content, viscosity, elongation at break and other properties are tested. It can only be used after passing the test.

Further, as described in step S5, when the paint is used, the surface to be coated needs to be sand blown or polished, solvent degreasing and other operations are required to keep the surface clean. The thickness of primer, transition layer and surface layer is controlled at 0.08~0.15mm. Generally, each layer needs to be sprayed, dipped or brushed twice to ensure the thickness of each layer. The interval between two operations, that is, the drying time, is about 20 minutes. The total thickness after three layers of construction is about 0.24~0.45mm. After the coating is completed, leave it at room temperature for 24 hours. Depending on actual needs, you can choose to proceed directly with the subsequent operation, or at 100°C, keep it warm for 2 hours before proceeding with the subsequent operation.

The application process method of the multi-layer room temperature curing peelable protective coating that is resistant to strong oxidants provided in Example 2 has the following characteristics: 1) The construction process is simple and convenient, and can be realized by brushing, spraying, dipping and other process methods; 2) It takes into consideration It achieves a balance between the bonding force and peelability of the primer and the substrate, which not only ensures good peelability, but also prevents the occurrence of peeling or debonding during use; 3) Each spray or brush application The time interval is short, about 20 minutes, and the operation can be continued to save process time.

It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular forms are also intended to include the plural forms unless the context clearly indicates otherwise. Furthermore, it will be understood that when the terms "comprises" and/or "includes" are used in this specification, they indicate There are features, steps, operations, means, components and/or combinations thereof.

It should be noted that the terms "first", "second", etc. in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the application described herein, for example, can be practiced in sequences other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus that encompasses a series of steps or units and need not be limited to those explicitly listed. Those steps or elements may instead include other steps or elements not expressly listed or inherent to the process, method, product or apparatus.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A room temperature strong oxidizer resistant strippable coating comprising:

SBS resin: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: mixing the N to obtain first mixed raw rubber and second mixed raw rubber with different components;

the first mixed raw rubber is prepared into first raw rubber through thin pass, sheet falling and back refining, and the first raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, preparing a first coating;

the second mixed raw rubber is prepared into second raw rubber through thin pass, sheet falling and back refining, and the second raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, preparing a second coating;

the solid content of the first coating and the second coating is more than 30%, the viscosity is not less than 2000mPaS, the elongation at break is not less than 600% after the coating is cured at room temperature for 24 hours, the elongation at break is not more than 50% after the coating is soaked in acid solution or alkali solution, and the use temperature of the coating can reach 100 ℃ after the coating is cured at room temperature.

2. The preparation method of the room-temperature strong-oxidant-resistant strippable coating is characterized by comprising the following steps of:

s10, SBS resin: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: mixing the N, namely mixing the first mixed raw rubber and the second mixed raw rubber with different components;

s20, the first mixed raw rubber is processed into first raw rubber through thin pass, lower piece and back refining, and the second mixed raw rubber is processed into second raw rubber through thin pass, lower piece and back refining;

s30 adding the first virgin rubber: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5 into a first coating, dissolving and dispersing the second virgin rubber: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5 into a second coating.

3. The method for preparing the room temperature strong oxidizer resistant strippable coating according to claim 2, wherein the SBS resin is of the grades 1401 and 1201, the phenolic resin is of the grade 2401, and the filler is magnesium silicate; the auxiliary agent comprises an accelerator and a pigment.

4. The method for producing a room temperature strong oxidizer resistant peelable coating according to claim 3, wherein in S20, the SBS resin: phenolic resin: magnesium silicate: and (3) an accelerator: the pigment is 100:10-20:75-100:1.5-2.0:0.1-0.5; mixing adopts an open mill mode, and sequentially adding according to the formula sequence; the left and right cutters are not less than 8 times during mixing.

5. The method of producing a room temperature strong oxidizer resistant peelable coating according to claim 4, wherein in S20, the thin pass roll gap is M, the bottom sheet roll gap is N, and the return roll gap is P, and the roll gap value is set to be: p > M > N, and P is generally not more than 2.5mm, N is generally not less than 0.5mm.

6. The method for preparing the room temperature strong oxidizer resistant strippable coating according to claim 5, wherein in step S30, the first virgin rubber or the second virgin rubber is first stirred in a stirred tank: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, adding a solvent and then adding an original film; after the film is dissolved, dispersing for not less than 32 hours, wherein the rotating speed is not less than 960r/min; after the dispersion is completed, adding an accelerator, and re-dispersing for not less than 4 hours; after the preparation is completed, filtering and discharging are carried out, and the solid content, the viscosity and the stretch-break elongation are tested; after being qualified, the recipe can be used.

7. The method for producing a room temperature strongly oxidizing agent resistant releasable coating according to claim 6, wherein the solvent is toluene or tetrachloroethylene and the auxiliary agent is an accelerator.

8. The method for preparing a room temperature strong oxidizer resistant peelable coating according to claim 6, wherein in the step S40, the surface to be coated is subjected to operations such as sand blowing or polishing treatment, solvent degreasing, etc. to keep the surface clean when the coating is used.

9. The method for preparing the room-temperature strong oxidant resistant strippable coating according to claim 8, wherein the thicknesses of the primer, the transition layer and the surface layer are controlled to be 0.08-0.15 mm, each layer is required to be sprayed, dip-coated or brushed for multiple times to ensure the thickness of each layer, the open time of two adjacent operation intervals is about 20min, the total thickness of three layers after construction is about 0.24-0.45 mm, after the coating is finished, the three layers are placed at normal temperature for 24h, the subsequent operation is directly selected according to actual needs, or the subsequent operation is carried out after heat preservation for 2h at 100 ℃.

10. The coating protection structure is characterized by sequentially comprising a base material, a bottom layer, a transition layer and a surface layer, wherein the bottom layer and the surface layer are sprayed by adopting first coating, the transition layer is sprayed by adopting second coating, the first coating is the first coating of claim 1, and the second coating is the second coating of claim 1.