Anti-sticking lubricating coating and coating method and coating on rubber surface

Abstract

The invention discloses an anti-sticking lubricating coating and a method for coating the anti-sticking lubricating coating on a rubber surface and a coating, the anti-sticking lubricating coating is applied to a tire forming rubber sleeve, the coating is mainly composed of a primer, an adhesive force improving additive and an anti-sticking polymer, the primer is coated on the rubber surface, and the adhesive force improving additive is coated on the anti-sticking polymer. And the adhesion improving additive and the anti-sticking polymer form an anti-sticking lubricant which is coated on the surface of the primer. The invention can successfully solve the problem of excessive adhesion between the molded air bag and the tire blank in the use process of the molded air bag.

Description

Technical Field

[0001] The invention belongs to the technical field of tire molding capsule manufacturing, and particularly relates to an anti-sticking lubricating coating applied to a tire molding sleeve and an application method thereof. Background Art

[0002] The nitrile rubber center sleeve molding capsule is an auxiliary device used in tire molding machines to replace the traditional mechanical molding drum. The size of the tire molding is adjusted according to the pressure of the compressed gas. Because the rubber sleeve is light in weight and quick to install, it can greatly save the time and labor of replacing the mechanical molding drum for producing different tire specifications. However, because the rubber sleeve is made of rubber, the tire lining and the sleeve surface will adhere to each other during the molding process, resulting in unsmooth embryo removal. In severe cases, the tire embryo may be damaged, and the service life of the center sleeve may be reduced. Summary of the invention

[0003] In order to completely solve the problem of excessive adhesion between the tire embryo and the rubber center sleeve, and to further improve the service life of the center sleeve and thus increase the tire production efficiency, the present invention aims to provide a method for coating an anti-stick lubricating coating and a primer on the surface of a tire molding rubber sleeve to form a coating on the surface of the rubber sleeve.

[0004] The technical solution adopted by the present invention is as follows:

[0005] An anti-sticking lubricating coating applied to a rubber surface comprises an anti-sticking polymer and an adhesion improving additive. The anti-sticking polymer and the adhesion improving additive are mixed with rubber gasoline in the following mass ratio to obtain the coating:

[0006] Anti-stick polymer: adhesion improving additive: rubber gasoline = 1: 0.15: (0.5-0.6);

[0007] Wherein, the components and mass percentages of the anti-sticking polymer are as follows:

[0008]

[0009] The components and mass percentages of the adhesion improving additive are as follows:

[0010]

[0011] Wherein, the specific preparation steps of the anti-sticking polymer are:

[0012] ① Add hydroxymethyl silicone oil and white carbon black into a reaction tank according to the ratio and stir them thoroughly at 80-120°C for 6-8 hours to obtain an organosilicon composite;

[0013] ② Add rubber gasoline according to a certain proportion to dilute the organosilicon composite at room temperature;

[0014] ③ Before use, take the organosilicon composite, add vinyltributylidene oxime silane according to the proportion, stir well and then use, and it is required to be used up within 4 hours.

[0015] The specific preparation steps of the adhesion improving additive are: adding calcium carbonate, cocoa plant seed soap and hydroxymethyl silicone oil into a mixing tank according to a proportion, stirring for 2-3 hours, then adding octamethylcyclotetrasiloxane, and continuing to stir for 20-30 minutes to complete the preparation.

[0016] The present invention also provides a method for coating the anti-stick lubricating coating on a rubber surface, comprising the steps of 1) pre-treating the rubber surface - 2) applying a primer - 3) applying the anti-stick lubricating coating - 4) curing the coating;

[0017] Among them, the primer components and mass percentages used are as follows:

[0018]

[0019] Wherein, the step of applying the primer comprises:

[0020] S21. Take an appropriate amount of primer and dilute it with rubber gasoline in a mass ratio of 1:9;

[0021] S22, using a brush to apply a layer of the primer solution diluted in step S21 on the rubber surface;

[0022] S23. The coated rubber is left to stand at room temperature with a humidity lower than 60% for 1 to 3 hours.

[0023] The anti-stick lubricating coating is applied on the rubber surface coated with the primer using a brush or an air gun.

[0024] The consumption of the anti-stick lubricating coating is 0.04-0.06 g / cm2.

[0025] Wherein, the step of pre-treating the rubber surface comprises:

[0026] S11. Use a dry sponge or dry cloth to clean the rubber surface and remove any impurities adhering to the rubber;

[0027] S12. Based on step S11, the rubber surface is wiped with a rubber treating agent, and the treated rubber is allowed to stand at room temperature for 30 minutes to 1 hour to allow the volatile substances to evaporate safely.

[0028] The present invention also provides an anti-stick coating on a rubber surface, comprising:

[0029] 1) a primer layer, wherein the primer layer is prepared by mixing a primer and rubber gasoline in a mass ratio of 1:9;

[0030] Wherein, the components and mass percentages of the primer are as follows:

[0031]

[0032] 2) Anti-stick lubricating coating layer: the anti-stick lubricating coating is prepared by anti-sticking polymer, adhesion improving additive and rubber gasoline in a mass ratio of 1:0.15:(0.5-0.6));

[0033] Wherein, the anti-sticking polymer is the following components and mass percentages:

[0034]

[0035] The adhesion improving additives are the following components and their mass percentages:

[0036]

[0037] The primer layer is coated on the rubber surface, and the anti-sticking lubricating coating layer is coated on the surface of the primer layer.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] 1. The present invention can successfully solve the problem of excessive adhesion between the rubber molding sleeve and the tire embryo during use, making the embryo removal smoother, reducing the downtime for processing or replacing the airbag, improving production efficiency, and saving labor costs.

[0040] 2. The improved forming sleeve has a longer service life, which improves production efficiency, saves the tire factory's raw material costs, and actively practices low-carbon and environmentally friendly production.

[0041] 3. The amount of anti-sticking agent applied can be controlled according to the life cycle of the rubber molding sleeve so that they can match each other. The operation is simple and scientific without causing additional waste of resources.

[0042] Other features and advantages of the present invention will be set forth in the following description, and in part will be apparent from the description, or may be learned by practicing the present invention. DETAILED DESCRIPTION

[0043] The present invention is described in detail below in conjunction with embodiments. However, those skilled in the art should know that the following embodiments are not the only limitations on the technical solutions of the present invention, and any equivalent changes or modifications made within the spirit of the technical solutions of the present invention should be deemed to fall within the protection scope of the present invention.

[0044] The present invention provides an anti-stick lubricating coating applied to a rubber surface, the coating mainly comprising two ingredients: an anti-stick polymer and an adhesion improving additive. The anti-stick polymer is the main component of the coating, and its function is to prevent the center sleeve from adhering to the surface of the inner liner of the tire embryo, and the adhesion improving additive can enhance the adhesion of the coating on the surface of the center sleeve.

[0045] 1. The components and mass percentages of the anti-sticking polymer are as follows:

[0046]

[0047] The specific steps for making anti-sticking polymer are:

[0048] ① Add hydroxymethyl silicone oil and white carbon black into a reaction tank according to the ratio, fully stir and react at 80-120°C for 6-8 hours to obtain an organosilicon composite.

[0049] ② At room temperature, add rubber gasoline in proportion to dilute the organic silicon composite obtained after the reaction to facilitate subsequent application on the rubber sleeve.

[0050] ③ Before applying, take an appropriate amount of diluted silicone composite according to the dosage, then add vinyl trisbutyl ketoxime silane as a coupling agent in proportion, stir well and use it, and it is required to be used up within 4 hours.

[0051] The reaction mechanism is that the coupling agent vinyl trisbutyl ketoxime silane will vulcanize the organic silicon composite at room temperature to form a protective layer, which has good lubrication, wear resistance and corrosion resistance.

[0052] 2. The components and mass percentages of adhesion improving additives are as follows:

[0053]

[0054] The specific steps for making adhesion improving additives are:

[0055] Put calcium carbonate, cocoa butter or cocoa seed soap (break into small pieces in advance) and hydroxymethyl silicone oil into a mixing tank according to the proportion. After stirring for 2-3 hours, add octamethylcyclotetrasiloxane and continue stirring for 20-30 minutes to complete the preparation.

[0056] The reaction mechanism is that octamethylcyclotetrasiloxane reacts with hydroxymethyl silicone oil to form modified silicone oil, which can effectively penetrate into the nitrile rubber sleeve substrate to enhance the adhesion between the coating and the substrate. Calcium carbonate and cocoa butter are physical fillers of the vulcanized elastomer, which can make the coating an elastomer with a certain hardness and warmth.

[0057] The above calcium carbonate can be nano calcium carbonate, and the cocoa plant soap can be replaced by cocoa butter.

[0058] The above-mentioned adhesion improving additive and anti-sticking polymer are mixed in the following mass ratio, and diluted with rubber gasoline, where the rubber gasoline is 120# (CAS: 64741-42-0), to obtain the target anti-sticking lubricating coating:

[0059] Anti-stick polymer: adhesion improving additive: rubber gasoline = 1: 0.15: (0.5 ~ 0.6).

[0060] The anti-stick lubricating coating is applied to the surface of nitrile rubber to form an anti-stick coating layer, which plays an anti-stick and lubricating role.

[0061] The present invention also provides a method for coating the anti-stick lubricating coating on the surface of a nitrile rubber sleeve, which comprises the following steps: 1) pretreatment of the rubber sleeve surface - 2) application of primer - 3) application of the anti-stick lubricating coating - 4) coating curing.

[0062] 1) Surface pretreatment of rubber sleeve

[0063] S11. Use a dry sponge or dry cloth to clean the outer surface of the rubber sleeve and remove any impurities adhering to the rubber sleeve;

[0064] S12. Based on step S11, use a rubber treatment agent to wipe the surface of the rubber sleeve. This solution uses a 793K reinforced rubber treatment agent to improve the bonding effect between the rubber surface and the primer. The treated sleeve is left to stand at room temperature for 30 minutes to 1 hour to allow its volatile substances to evaporate safely.

[0065] 2) Primer application

[0066] The present invention uses a special primer for painting, and the components and mass percentages of the primer are as follows:

[0067]

[0068] The steps for making primer are:

[0069] Put all the ingredients into a mixing tank and stir for 5-10 minutes until they are evenly mixed.

[0070] The steps for applying primer are as follows:

[0071] S21, take an appropriate amount of the above primer, dilute it with rubber gasoline, the rubber gasoline is 120# (CAS: 64741-42-0), the dilution ratio of the primer to the rubber gasoline is 1:9 by mass;

[0072] S22, based on step S21, use a brush to dip the diluted primer solution and apply a layer of primer solution on the outer surface of the rubber sleeve;

[0073] S23. The coated sleeve is left to stand at room temperature with a humidity lower than 60% for 1 to 3 hours.

[0074] 3) Application of anti-stick lubricating coating

[0075] S31, placing the rubber sleeve that has been primed on the rotatable device;

[0076] S32. Use a brush or air gun to apply the anti-stick lubricating coating prepared according to the above formula (anti-stick polymer: adhesion improving additive: rubber gasoline = 1:0.15:(0.5~0.6)) on the surface of the primer. The amount of anti-stick lubricating coating depends on the size of the rubber sleeve. The general consumption is about 0.04-0.06g / c㎡. In order to enhance the lubrication effect, the amount can be increased as appropriate.

[0077] 4) Curing of anti-stick coating

[0078] Place the rubber sleeve coated with the anti-stick lubricating coating in a well-ventilated place for at least 72 hours to allow the coating to cure, allow the siloxane polymer to fully react with the moisture in the air, and allow the diluted solution to fully evaporate.

[0079] It can be seen that the present invention also provides an anti-stick coating on the surface of a rubber sleeve, comprising:

[0080] 1) a primer layer, wherein the primer layer is prepared by mixing a primer and rubber gasoline in a mass ratio of 1:9;

[0081] Wherein, the components and mass percentages of the primer are as follows:

[0082]

[0083] 2) Anti-stick lubricating coating layer

[0084] The anti-sticking lubricating coating is prepared from an anti-sticking polymer, an adhesion improving additive, and rubber gasoline in a mass ratio of 1:0.15:(0.5-0.6));

[0085] Wherein, the anti-sticking polymer is the following components and mass percentages:

[0086]

[0087] The adhesion improving additives are the following components and their mass percentages:

[0088]

[0089] The primer layer is coated on the surface of the rubber sleeve, and the anti-stick lubricating coating layer is coated on the surface of the primer layer to form an anti-stick coating.

Claims

1. An anti-stick lubricating coating applied to a rubber surface, characterized in that: The coating comprises an anti-sticking polymer and an adhesion improving additive, wherein the anti-sticking polymer and the adhesion improving additive are mixed with rubber gasoline in the following mass ratio to obtain the coating: Anti-stick polymer: adhesion improving additive: rubber gasoline = 1: 0.15: (0.5-0.6); Wherein, the components and mass percentages of the anti-sticking polymer are as follows: The components and mass percentages of the adhesion improving additive are as follows:

2. The anti-stick lubricating coating for rubber surface according to claim 1, characterized in that: The specific preparation steps of the anti-sticking polymer are: ① Add hydroxymethyl silicone oil and white carbon black into a reaction tank according to the ratio, stir and react at 80-120℃ for 6-8 hours to obtain an organosilicon composite; ② Add rubber gasoline according to a certain proportion to dilute the organosilicon composite at room temperature; ③ Before use, take the organosilicon composite, add vinyltributylidene oxime silane according to the proportion, stir well and then use, and it is required to be used up within 4 hours.

3. The anti-stick lubricating coating for rubber surface according to claim 1, characterized in that: The specific preparation steps of the adhesion improving additive are: adding calcium carbonate, cocoa plant seed soap and hydroxymethyl silicone oil into a mixing tank according to a proportion, stirring for 2-3 hours, then adding octamethylcyclotetrasiloxane, and continuing to stir for 20-30 minutes to complete the preparation.

4. A method for coating the anti-stick lubricating coating according to any one of claims 1 to 3 on a rubber surface, characterized in that: It includes several steps: 1) rubber surface pretreatment - 2) primer application - 3) anti-stick lubricating coating application - 4) coating curing; Among them, the primer components and mass percentages used are as follows:

5. The coating method according to claim 4, characterized in that: The step of applying the primer comprises: S21. Take an appropriate amount of primer and dilute it with rubber gasoline in a mass ratio of 1:9; S22, using a brush to apply a layer of the primer solution diluted in step S21 on the rubber surface; S23. The coated rubber is left to stand at room temperature with a humidity lower than 60% for 1 to 3 hours.

6. The coating method according to claim 4, characterized in that: The anti-stick lubricating coating is applied on the rubber surface coated with the primer using a brush or an air gun.

7. The coating method according to claim 4 or 6, characterized in that: The consumption of the anti-stick lubricating coating is 0.04-0.06 g / cm2.

8. The coating method according to claim 4, characterized in that: The steps of rubber surface pretreatment include: S11. Use a dry sponge or dry cloth to clean the rubber surface and remove any impurities adhering to the rubber; S12. Based on step S11, the rubber surface is wiped with a rubber treating agent, and the treated rubber is allowed to stand at room temperature for 30 minutes to 1 hour to allow the volatile substances to evaporate safely.

9. An anti-stick coating on a rubber surface, characterized in that: include: 1) a primer layer, wherein the primer layer is prepared by mixing a primer and rubber gasoline in a mass ratio of 1:9; Wherein, the components and mass percentages of the primer are as follows: 2) Anti-stick lubricating coating layer: the anti-stick lubricating coating is prepared by anti-sticking polymer, adhesion improving additive and rubber gasoline in a mass ratio of 1:0.15:(0.5-0.6)); Wherein, the anti-sticking polymer is the following components and mass percentages: The adhesion improving additives are the following components and their mass percentages: The primer layer is coated on the rubber surface, and the anti-sticking lubricating coating layer is coated on the surface of the primer layer.

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