Anticorrosive silicone rubber coating and preparation method thereof

Abstract

The invention discloses an anti-corrosion silicone rubber coating and a preparation method, and belongs to the field of coatings. The invention relates to an anti-corrosion silicone rubber coating which is prepared from the following raw materials in percentage by weight: 40-60% of hydroxyl-terminated polydimethylsiloxane, 10-20% of a curing agent, 5-10% of a composite silane coupling agent, 5-10% of a diluent and 5-10% of a catalyst. 3-5% of dimethyl silicone oil; 3-10% of silicon resin; the balance of powder filler; the silicon resin is methyl phenyl type moisture curing silicon resin; the composite silane coupling agent is formed by reaction of a plurality of silane coupling agents, and the silane coupling agent is formed by reaction of at least two of amino silane, epoxy silane and isocyanate silane. The coating has the effects of improving the adhesive force between the coating and a base material and improving the corrosion resistance at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint, in particular to a kind of anticorrosive silicone rubber paint and preparation method. BACKGROUND

[0002] Engineering anticorrosion is one of the important guarantees of engineering quality, due to not paying attention to engineering anticorrosion, low standard defense, improper anticorrosion coating measures or poor engineering quality and environmental pollution aggravating corrosion, etc. The loss caused by corrosion every year is serious, especially the corrosion loss of civil buildings such as steel structure buildings accounts for a large proportion. Therefore, in the construction of engineering construction, the importance of anticorrosion coating engineering is more and more obvious, people pay more attention to the research and application of anticorrosive paint.

[0003] Anticorrosive silicone rubber paint is a new type of anticorrosive paint, which is made of modified silicone rubber as main film forming material, plasticizer, solvent and the like. The anticorrosive silicone rubber paint not only has better anticorrosion performance than traditional anticorrosive paint, but also has the characteristics of water-based environmental protection. The anticorrosive silicone rubber paint can be widely used in steel structure roof, old metal roof renovation, ship steel deck, open-air storage tank, container, sewage treatment pipe, chemical pipeline, machinery and other rust and corrosion prevention engineering.

[0004] The anticorrosive silicone rubber paint has high bond energy Si-O as main chain structure, so it has outstanding corrosion resistance. However, in practical application, it is found that the adhesion between the paint and the substrate is difficult to balance with the corrosion resistance, which affects the comprehensive application effect of the anticorrosive silicone rubber paint. SUMMARY

[0005] In order to improve the adhesion between the paint and the substrate and improve the corrosion resistance, the present application provides an anticorrosive silicone rubber paint and a preparation method.

[0006] In the first aspect, the anticorrosive silicone rubber paint provided by the present application adopts the following technical scheme: An anticorrosive silicone rubber paint, the preparation raw materials include base glue, curing agent, composite silane coupling agent, diluent and catalyst, the base glue is made of the following raw materials in weight percentage: Hydroxyl-terminated polydimethylsiloxane 40-60%; Dimethyl silicone oil 3-5%; Silicone resin 3-10%; Powder filler balance; The silicone resin is methylphenyl type moisture curing silicone resin; The composite silane coupling agent is formed by the reaction of a plurality of silane coupling agents, and the silane coupling agent includes at least two of amino silane, epoxy silane and isocyanate silane.

[0007] By adopting the technical scheme, the silicone resin can be cured by moisture to further crosslink with poly-silicon hydroxyl in the silicone rubber system, and the benzene ring structure in the silicone resin greatly enhances the hardness of the coating, thereby improving the fireproof and anticorrosive properties of the coating; the composite silane coupling agent is formed by the reaction of multiple silane coupling agents, which improves the oil immersion property of the base material, thereby improving the adhesion of the silicone rubber coating to the base material such as steel plate, glass and aluminum alloy, i.e. improving the adhesion of the coating, and further improving the durability of the anticorrosive coating.

[0008] Since the silicone resin is wound in the silicone rubber system, the dispersion and stability of the composite silane coupling agent are provided, thereby balancing the adhesion and anticorrosive properties of the coating.

[0009] In addition, the traditional anticorrosive coating includes three coating layers of primer, midcoat and topcoat, while the anticorrosive silicone rubber coating is only composed of one coating layer, and the construction is more convenient.

[0010] Optionally, the silane coupling agent is compounded by amino silane and epoxy silane in a mass ratio of (2-2.5):(1-1.2).

[0011] By adopting the technical scheme, the amino active hydrogen of the amino silane reacts with the epoxy group of the epoxy silane to realize the compounding of the silane coupling agent, improve the adaptability of the silane coupling agent to the silicone rubber coating system, and thereby enhance the anticorrosive properties and adhesion of the coating.

[0012] Optionally, the silane coupling agent is compounded by amino silane, epoxy silane and isocyanate silane in a mass ratio of (2-2.5):(0.7-0.9):(0.2-0.3).

[0013] By adopting the technical scheme, the isocyanate group of the isocyanate silane can further modify the composite structure of the silane coupling agent, and further enhance the comprehensiveness of the anticorrosive properties of the coating.

[0014] Optionally, the amino silane is one or more of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane and cyclohexylamine propyl trimethoxysilane; the epoxy silane is one or both of γ-glycidyl ether oxygen propyl trimethoxysilane and γ-glycidyl ether oxygen propyl triethoxysilane; and the isocyanate silane is γ-isocyanate propyl trimethoxysilane.

[0015] Optionally, the silane coupling agent is compounded by amino silane, epoxy silane and isocyanate silane according to the mass ratio of (2-2.5):(0.8-1):(0.2-0.3); the amino silane is selected from cyclohexylamine propyl trimethoxysilane, the epoxy silane is selected from γ-glycidyl ether propyl trimethoxysilane, and the isocyanate silane is selected from γ-isocyanate propyl trimethoxysilane.

[0016] By adopting the above technical scheme, the amino silane is selected from cyclohexylamine propyl trimethoxysilane, the spatial density is improved by using the cyclohexylamine structure, a small amount of γ-isocyanate propyl trimethoxysilane is matched to improve the adaptability of the silane coupling agent and the silicone resin, so that the coating has good toughness and can resist external impact.

[0017] Optionally, the curing agent is selected from methyl tributyl ketoxime silane.

[0018] By adopting the above technical scheme, the hydroxyl-terminated polydimethylsiloxane is subjected to condensation reaction crosslinking.

[0019] Optionally, the powder filler includes one or more of calcium carbonate, silicon dioxide, titanium dioxide and silicon powder.

[0020] By adopting the above technical scheme, the powder filler has high filling density, can effectively prevent moisture penetration, improve the waterproofness of the coating, and also can improve the hardness of the coating, and enhance the mechanical strength and wear resistance of the coating surface.

[0021] Optionally, the silicon dioxide is selected from hydrophobic fumed silicon dioxide.

[0022] Optionally, the calcium carbonate is selected from nano calcium carbonate.

[0023] Optionally, the titanium dioxide is selected from nano titanium dioxide.

[0024] Optionally, the powder filler is compounded by calcium carbonate, silicon dioxide, titanium dioxide and silicon powder according to the mass ratio of (3-4):(0.1-0.5):(0.1-0.5):(0.5-1).

[0025] Optionally, the diluent is selected from one or more of 100# solvent diluent, 120# solvent diluent and 150# solvent diluent.

[0026] Optionally, the catalyst is selected from organic tin catalyst.

[0027] Optionally, the base glue, the curing agent, the composite silane coupling agent, the diluent and the catalyst are compounded according to the mass ratio of 1:(0.1-0.15):(0.06-0.1):(0.15-0.25):(0.005-0.015).

[0028] By adopting the technical scheme, the proportion of the curing agent, the composite silane coupling agent, the diluent and the catalyst is controlled, and the silicone rubber coating with strong adhesion and stable storage is obtained.

[0029] In the second aspect, the application provides a preparation method of the anticorrosive silicone rubber coating. The preparation method of the anticorrosive silicone rubber coating comprises the following steps: The hydroxyl-terminated polydimethylsiloxane, the dimethyl silicone oil, the silicone resin and the powder filler are stirred and mixed to obtain a base glue; The base glue is ground, then the diluent is added by batches under stirring, and then the curing agent, the composite silane coupling agent and the catalyst are added after the addition of the diluent is completed, and the stirring is continued, and then the anticorrosive silicone rubber coating is obtained after filtration and sealing.

[0030] By adopting the technical scheme, the diluent is added by batches, which promotes the uniform dispersion of the base glue and helps to improve the uniformity of the coating.

[0031] Optionally, the preparation method of the composite silane coupling agent comprises the following steps: heating amino silane to 60-80℃, then adding other types of silane coupling agents dropwise for reaction, and obtaining the composite silane coupling agent after the dropwise addition is completed.

[0032] By adopting the technical scheme, the reaction between the silane coupling agents is promoted by heating, and the composite silane coupling agent is obtained.

[0033] In summary, the application has the following beneficial effects: 1. In the silicone rubber system, the silicone resin can be cured by moisture, and the silicone resin can be further crosslinked and wound in the silicone rubber system through the polyvalent silicon hydroxyl group. The benzene ring structure in the silicone resin greatly enhances the hardness of the coating, thereby improving the fireproof and anticorrosive properties of the coating. The composite silane coupling agent is formed by the reaction of multiple silane coupling agents, which improves the oil immersion property of the base material, thereby improving the adhesion of the silicone rubber coating to the base material, such as steel plate, glass and aluminum alloy, i.e. improving the adhesion of the coating, and further improving the durability of the anticorrosive coating. The silicone resin is wound in the silicone rubber system, which provides a basis for the dispersion and stability of the composite silane coupling agent, thereby balancing the adhesion and anticorrosive properties of the coating.

[0034] 2. The preferred composite silane coupling agent of the application is cyclohexylamine propyl trimethoxysilane, which uses the cyclohexylamine structure to improve the spatial density and matches with gamma-isocyanate propyl trimethoxysilane to improve the adaptability of the silane coupling agent to the silicone resin, so that the coating has good toughness and can resist external impact. DETAILED DESCRIPTION

[0035] The application will be further described below.

[0036] Preparation Example 1 The composite silane coupling agent is prepared by reacting amino silane and epoxy silane. The amino silane and the epoxy silane are compounded according to a mass ratio of 2:1. Specifically, the amino silane is γ-aminopropyl trimethoxysilane, and the epoxy silane is γ-glycidyloxypropyl trimethoxysilane.

[0037] The preparation method of the composite silane coupling agent comprises the following steps: The amino silane is put into a reaction container and heated to 60°C. Then, the epoxy silane is added dropwise while stirring. After the addition is completed, the composite silane coupling agent is obtained.

[0038] Preparation Example 2 The composite silane coupling agent is different from that of Preparation Example 1 in that the amino silane and the epoxy silane are compounded according to a mass ratio of 2.5:1.2.

[0039] Preparation Example 3 The composite silane coupling agent is prepared by reacting amino silane, epoxy silane and isocyanate silane. The amino silane, the epoxy silane and the isocyanate silane are compounded according to a mass ratio of 2:0.7:0.2. Specifically, the amino silane is γ-aminopropyl trimethoxysilane, the epoxy silane is γ-glycidyloxypropyl trimethoxysilane, and the isocyanate silane is γ-isocyanate propyl trimethoxysilane.

[0040] The preparation method of the composite silane coupling agent comprises the following steps: The amino silane is put into a reaction container and heated to 80°C. Then, the epoxy silane is added dropwise while stirring. After the addition is completed, the isocyanate silane is added dropwise. After the addition is completed, the composite silane coupling agent is obtained.

[0041] Preparation Example 4 The composite silane coupling agent is different from that of Preparation Example 3 in that the amino silane, the epoxy silane and the isocyanate silane are compounded according to a mass ratio of 2.5:0.9:0.3.

[0042] Preparation Example 5 The composite silane coupling agent is prepared by reacting amino silane, epoxy silane and isocyanate silane. The amino silane, the epoxy silane and the isocyanate silane are compounded according to a mass ratio of 2:0.7:0.2. Specifically, the amino silane is cyclohexylamine propyl trimethoxysilane, the epoxy silane is γ-glycidyloxypropyl trimethoxysilane, and the isocyanate silane is γ-isocyanate propyl trimethoxysilane.

[0043] The preparation method of the composite silane coupling agent comprises the following steps: The amino silane is put into a reaction container, heated to 80℃, and then the epoxy silane is added dropwise while stirring, after the dropwise addition is completed, the isocyanate silane is added dropwise, and after the dropwise addition is completed, a composite silane coupling agent is obtained.

[0044] Example 1 A corrosion-resistant silicone rubber coating is prepared by compounding raw materials including base glue, curing agent, composite silane coupling agent, diluent and catalyst in a mass ratio of 1:0.1:0.06:0.15:0.005. Specifically, the curing agent is methyltris(butanone oxime)silane; the diluent is 120# solvent diluent; the catalyst is stannous octoate; and the composite silane coupling agent is prepared according to Preparation Example 1.

[0045] The base glue is prepared from raw materials in the following weight percentages: hydroxyl-terminated polydimethylsiloxane 40%, dimethyl silicone oil 3%, silicone resin 10%, and powder filler 47%. Specifically, the viscosity of the hydroxyl-terminated polydimethylsiloxane is 6000 mPa·s; the viscosity of the dimethyl silicone oil is 1000 mPa·s; and the silicone resin is a methylphenyl type moisture curing silicone resin, specifically purchased from SLOCOC New Material Co., Ltd. Model 6104A. This model is disclosed for the purpose of fullness, and is not limited.

[0046] The powder filler is a compound of calcium carbonate, silicon dioxide, titanium dioxide and silicon powder in a mass ratio of 3:0.1:0.1:0.5. Specifically, the calcium carbonate is nano calcium carbonate, the silicon dioxide is hydrophobic fumed silica, and the titanium dioxide is nano titanium dioxide.

[0047] A method for preparing a corrosion-resistant silicone rubber coating includes the following steps: Hydroxyl-terminated polydimethylsiloxane, dimethyl silicone oil, silicone resin and powder filler are put into a kneader together and stirred and mixed. The stirring process is controlled at a temperature of 130±3℃, and the stirring time is 4h, to prepare the base glue.

[0048] The base glue is ground, and the ground base glue is then transferred into a planetary high-speed stirrer. The diluent is added in three portions while stirring, with each portion stirred for 1h. After the diluent is added, the curing agent, composite silane coupling agent and catalyst are added, and stirring is continued for 15min. The mixture is filtered through a filter screen, filled, sealed, and a corrosion-resistant silicone rubber coating is obtained.

[0049] Example 2 A corrosion-resistant silicone rubber coating is prepared by compounding raw materials including base glue, curing agent, composite silane coupling agent, diluent and catalyst in a mass ratio of 1:0.15:0.1:0.25:0.015. Specifically, the curing agent is methyltris(butanone oxime)silane; the diluent is 120# solvent diluent; the catalyst is stannous octoate; and the composite silane coupling agent is prepared according to Preparation Example 1.

[0050] The base glue is made of raw materials in the following weight percentages: hydroxyl-terminated polydimethylsiloxane 60%, dimethyl silicone oil 5%, silicone resin 3%, and powder filler 32%. Specifically, the viscosity of the hydroxyl-terminated polydimethylsiloxane is 6000 mPa·s; the viscosity of the dimethyl silicone oil is 1000 mPa·s; and the silicone resin is a methyl phenyl type moisture curing silicone resin, specifically of model 6104A purchased from SLOCOC New Material Co., Ltd.

[0051] The powder filler is a compound of calcium carbonate, silicon dioxide, titanium dioxide, and silicon powder in a mass ratio of 4:0.5:0.5:1. Specifically, the calcium carbonate is nano calcium carbonate, the silicon dioxide is hydrophobic fumed silica, and the titanium dioxide is nano titanium dioxide.

[0052] A preparation method of a corrosion-resistant silicone rubber coating, comprising the following steps: Hydroxyl-terminated polydimethylsiloxane, dimethyl silicone oil, silicone resin, and powder filler are put into a kneader together for stirring and mixing. The temperature during stirring is controlled at 130±3℃, and the stirring time is 4h, to obtain the base glue.

[0053] The base glue is ground, and the ground base glue is then transferred into a planetary high-speed stirrer. A diluent is added by stirring for 1h in three times. After the addition of the diluent is completed, a curing agent, a composite silane coupling agent, and a catalyst are added, and stirring is continued for 15min. The mixture is filtered through a filter screen, filled, sealed, and a corrosion-resistant silicone rubber coating is obtained.

[0054] Example 3 A corrosion-resistant silicone rubber coating, which is different from Example 1 in that the base glue content is different.

[0055] The base glue is made of raw materials in the following weight percentages: hydroxyl-terminated polydimethylsiloxane 53%, dimethyl silicone oil 4%, silicone resin 5%, and powder filler 38%.

[0056] Example 4 A corrosion-resistant silicone rubber coating, which is different from Example 1 in that the composite silane coupling agent is prepared according to Preparation Example 3.

[0057] Example 5 A corrosion-resistant silicone rubber coating, which is different from Example 1 in that the composite silane coupling agent is prepared according to Preparation Example 5.

[0058] Comparative Example 1 A corrosion-resistant silicone rubber coating, which is different from Example 1 in that the base glue composition is different.

[0059] The base glue is made of raw materials in the following weight percentages: hydroxyl-terminated polydimethylsiloxane 40%, dimethyl silicone oil 3%, silicone resin 10%, powder filler 47%; specifically, the viscosity of the hydroxyl-terminated polydimethylsiloxane is 6000 mPa·s; the viscosity of the dimethyl silicone oil is 1000 mPa·s; the silicone resin is a methyl silicone resin, specifically HSV2611 type purchased from Haiduo Organic Silicon Co., Ltd.

[0060] Comparative Example 2 A corrosion-resistant silicone rubber coating, the difference between this embodiment and Example 1 is that the raw materials for preparation are different.

[0061] The raw materials for preparation include base glue, curing agent, silane coupling agent, diluent and catalyst, which are compounded in a mass ratio of 1:0.1:0.06:0.15:0.005. Specifically, the curing agent is methyl tributylketoxime silane; the diluent is 120# solvent diluent; the catalyst is stannous octoate; the silane coupling agent is γ-aminopropyltrimethoxysilane.

[0062] Comparative Example 3 A corrosion-resistant silicone rubber coating, the difference between this embodiment and Example 1 is that the raw materials for preparation are different.

[0063] The raw materials for preparation include base glue, curing agent, silane coupling agent, diluent and catalyst, which are compounded in a mass ratio of 1:0.1:0.06:0.15:0.005. Specifically, the curing agent is methyl tributylketoxime silane; the diluent is 120# solvent diluent; the catalyst is stannous octoate; the silane coupling agent is γ-glycidyl ether propyltrimethoxysilane.

[0064] Comparative Example 4 A corrosion-resistant silicone rubber coating, the difference between this embodiment and Example 1 is that the raw materials for preparation are different.

[0065] The raw materials for preparation include base glue, curing agent, silane coupling agent, diluent and catalyst, which are compounded in a mass ratio of 1:0.1:0.06:0.15:0.005. Specifically, the curing agent is methyl tributylketoxime silane; the diluent is 120# solvent diluent; the catalyst is stannous octoate; the silane coupling agent is γ-glycidyl ether propyltrimethoxysilane.

[0066] Effect test According to the following test requirements, test the performance effects of the corrosion-resistant silicone rubber coatings prepared in Examples 1-5 and Comparative Examples 1-4.

[0067] Acid resistance test: refer to GB / T 9274-1988 "Determination of the resistance of paint and varnish to liquid medium", use steel plate as the test substrate to coat the corrosion-resistant silicone rubber coating, immerse in 5% sulfuric acid solution, observe and record the duration of no abnormality of the coating, the results are shown in Table 1.

[0068] Salt water resistance test: According to GB / T 9274-1988 "Determination of resistance to liquid media of paints and varnishes", the steel plate was coated with the anti-corrosion silicone rubber coating as the test substrate, and immersed in 3% sodium chloride solution. The duration of the coating without abnormality was observed and recorded, and the results are shown in Table 1.

[0069] Salt spray resistance test: According to GB / T 1771-2007 "Determination of resistance to neutral salt spray of paints and varnishes", the steel plate was coated with the anti-corrosion silicone rubber coating as the test substrate, and tested by using a salt spray test chamber. The duration of the coating without abnormality was observed and recorded, and the results are shown in Table 1.

[0070] High temperature and high humidity resistance test: The steel plate was coated with the anti-corrosion silicone rubber coating as the test substrate, and tested by using a high temperature test chamber. The temperature was set to 60℃±2℃, and the humidity was set to 85% RH. The duration of the coating without abnormality was observed and recorded, and the results are shown in Table 1.

[0071] Adhesion test: According to GB / T 9286-1998 "Cross-hatch test for paint and varnish films", the tin plate was coated with the anti-corrosion silicone rubber coating as the test substrate. The shedding of the coating after cutting was observed and recorded, and classified into 0-5 grades. The smaller the grade number, the smaller the shedding area, and the better the adhesion. The results are shown in Table 2.

[0072] Impact resistance test: According to GB / T 1732-2020 "Paint film impact resistance test method", the tin plate was coated with the anti-corrosion silicone rubber coating as the test substrate. The impact height that the coating could withstand without cracks, wrinkles and peeling was recorded, and the results are shown in Table 2.

[0073] Table 1 Table 2 adhesion rating impact resistance height (cm) example 1 1 35 example 2 1 35 example 3 1 35 example 4 1 40 example 5 1 50 comparative example 1 3 25 comparative example 2 3 30 comparative example 3 3 30 comparative example 4 3 30 From the test results in Table 1, it can be seen that the anti-corrosion silicone rubber coating prepared by Examples 1-3 has good acid resistance, salt water resistance and salt spray resistance, and therefore has excellent comprehensive corrosion resistance. In addition, it has long high temperature and high humidity resistance time, indicating good weather resistance.

[0074] From the test results in Table 2, it can be seen that the anti-corrosion silicone rubber coating prepared by Examples 1-3 has good adhesion, which helps to improve the stability of the coating, and has good impact resistance and toughness.

[0075] Compared with the comparative example 1, the anti-corrosion silicone rubber coating prepared in the example 1 has higher anti-corrosion performance and adhesion, which indicates that the selection of the silicone resin has a mutual influence on the anti-corrosion performance and the adhesion. Similarly, compared with the comparative examples 2-4, the anti-corrosion silicone rubber coating prepared in the example 1 has higher anti-corrosion performance and adhesion, which further indicates that the composite silane coupling agent is formed by a specific silane coupling agent reaction, and can improve the comprehensive performance of the coating.

[0076] The composite silane coupling agent used in the example 1 is a composite of amino silane and epoxy silane, and the composite silane coupling agents used in the examples 4-5 are all composites of amino silane, epoxy silane and isocyanate silane. Compared with the example 1, the examples 4-5 have the same acid resistance and salt water resistance, and have a greater improvement in salt mist resistance, are more suitable for corrosion in marine environment, and have improved weather resistance in high temperature and high humidity, and have stronger comprehensive durability.

[0077] Specifically, the examples 4 and 5 use different amino silanes to prepare the composite silane coupling agent, and the example 5 using cyclohexylamine propyl trimethoxysilane performs better in impact resistance, which represents that the coating has stronger toughness and wider application range.

[0078] This specific embodiment is only an explanation of the present application, and is not a limitation of the present application. Those skilled in the art can make modifications to the specific embodiment without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An anti-corrosion silicone rubber coating, characterized by: The raw materials for preparation include base glue, curing agent, composite silane coupling agent, diluent and catalyst. The base glue is made of the following raw materials in the following weight percentages: Hydroxyl terminated polydimethylsiloxane 40-60%; Dimethyl silicone oil 3-5%; Silicone resin 3-10%; Powder filler remainder; The silicone resin is a methylphenyl type moisture curing silicone resin; The composite silane coupling agent is formed by reacting a plurality of silane coupling agents, wherein the silane coupling agent is formed by reacting at least two of aminosilane, epoxysilane and isocyanatesilane.

2. The anti-corrosion silicone rubber coating according to claim 1, characterized in that: The silane coupling agent is prepared by compounding aminosilane and epoxysilane in a mass ratio of (2-2.5): (1-1.2).

3. The anti-corrosion silicone rubber coating according to claim 1, characterized in that: The silane coupling agent is prepared by compounding aminosilane, epoxysilane and isocyanatesilane in a mass ratio of (2-2.5):(0.7-0.9):(0.2-0.3).

4. The anti-corrosion silicone rubber coating according to claim 1, characterized in that: The aminosilane is selected from one or more of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane and cyclohexylaminopropyltrimethoxysilane; the epoxysilane is selected from one or two of γ-glycidyloxypropyltrimethoxysilane and γ-glycidyloxypropyltriethoxysilane; and the isocyanatesilane is selected from γ-isocyanatepropyltrimethoxysilane.

5. The anti-corrosion silicone rubber coating according to claim 1, characterized in that: The silane coupling agent is selected from aminosilane, epoxysilane and isocyanatesilane in a mass ratio of (2-2.5):(0.8-1):(0.2-0.3); the aminosilane is selected from cyclohexylaminopropyltrimethoxysilane, the epoxysilane is selected from γ-glycidyloxypropyltrimethoxysilane, and the isocyanatesilane is selected from γ-isocyanatepropyltrimethoxysilane.

6. An anti-corrosion silicone rubber coating according to any one of claims 1 to 5, characterized in that: The curing agent is methyl tributylidene oxime silane.

7. An anti-corrosion silicone rubber coating according to any one of claims 1 to 5, characterized in that: The powder filler includes one or more of calcium carbonate, silicon dioxide, titanium dioxide and silicon powder.

8. An anti-corrosion silicone rubber coating according to any one of claims 1 to 5, characterized in that: The base glue, curing agent, composite silane coupling agent, diluent and catalyst are compounded according to a mass ratio of 1:(0.1-0.15):(0.06-0.1):(0.15-0.25):(0.005-0.015).

9. A method for preparing the anticorrosive silicone rubber coating according to any one of claims 1 to 8, characterized in that: The following steps are involved: Hydroxyl-terminated polydimethylsiloxane, dimethyl silicone oil, silicone resin and powder filler are mixed to prepare a base rubber; The base rubber is ground, then stirred and the diluent is added in batches. After the diluent is added, the curing agent, the composite silane coupling agent and the catalyst are added, and the stirring is continued. The mixture is filtered and sealed to obtain the anti-corrosion silicone rubber coating.

10. The method for preparing an anti-corrosion silicone rubber coating according to claim 9, characterized in that: The preparation method of the composite silane coupling agent comprises the following steps: heating aminosilane to 60-80° C., then dropwise adding other types of silane coupling agents for reaction, and obtaining the composite silane coupling agent after the dropwise addition is completed.

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