Low-temperature and high-humidity resistant primer for silicone sealant, and preparation method therefor

Abstract

Disclosed in the present invention are a modified silane coupling agent, a low-temperature and high-humidity resistant primer for a silicone sealant, and a preparation method therefor. The modified silane coupling agent is obtained by a dealcoholization cyclization reaction of bis(allyl-dialkoxysilyl) amine under the action of a catalyst, the bis(allyl-dialkoxysilyl) amine is obtained by an amino substitution reaction of allyl chloropropyl dialkoxysilane and liquid ammonia, and the allyl chloropropyl dialkoxysilane is obtained by an alcohol substitution reaction between allyl chloropropyl dichlorosilane and a short-chain alcohol. The structure of the modified silane coupling agent contains nitrogen heterocyclic rings, and in a high-humidity environment, the nitrogen heterocyclic rings are easily hydrolyzed, to form secondary amino silanes and to consume part of water on surfaces of the base materials. In addition, the secondary amine groups are capable of promoting hydrolysis of siloxane into a plurality of silanols and a rapid reaction capacity is achieved. The plurality of silanols have a good compatibility with the inorganic surface of the base materials, and can quickly form a film in the high-humidity environment. Strong adhesion in a low-temperature environment is achieved.

Description

A low-temperature and high-humidity resistant primer for silicone sealant and its preparation method

[0001] The present invention claims priority to a Chinese patent application filed with the Patent Office of China on August 25, 2023, with application number 2023110803778, entitled “A primer liquid for silicone sealant resistant to low temperature and high humidity and its preparation method,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The invention belongs to the technical field of sealants, and in particular relates to a primer liquid for silicone sealant that is resistant to low temperature and high humidity and a preparation method thereof. Background Art

[0003] Silicone sealant has excellent weather resistance, aging resistance, good sealing performance and easy construction and maintenance. It can achieve adhesion between most building materials. It is an important raw material in the construction field and is widely used in building curtain walls, insulating glass, energy-saving doors and windows, prefabricated buildings, decoration and decoration, etc.

[0004] The adhesion of silicone sealant to the substrate is related to the silicone sealant formula system on the one hand, and is affected by the temperature and humidity of the construction environment on the other hand. Under low temperature conditions, the wettability of silicone sealant to the substrate surface is reduced, and under high humidity conditions, the water-resistant adhesion of the sealant is poor, resulting in a decrease in adhesion to some substrates. For example, powder spraying and fluorocarbon spraying with special surface treatments often require applying a primer on the substrate surface to improve interfacial adhesion. Silicone sealant primer can significantly improve the adhesion between silicone sealant and the substrate, but it is easily affected by environmental factors during actual application. Under low temperature and high humidity conditions, the reaction activity of the primer is reduced, which slows down the initial bonding speed. In addition, the primer is easily hydrolyzed and ineffective after contacting the fog or frost on the substrate surface, and the organic system solvent has poor compatibility with water, resulting in uneven film formation, local non-stickiness and other problems, affecting adhesion.

[0005] Patent CN113402695A discloses a low-temperature and high-humidity resistant water-based polyurethane resin, which is prepared by reacting terminal hydroxyl polybutadiene, castor oil-modified polyester polyol, and isophorone diisocyanate. The resin forms an interpenetrating network structure through the reaction of terminal hydroxyl polybutadiene, castor oil-modified polyester polyol, and isophorone diisocyanate. After film formation, the resin has good low-temperature and high-humidity resistance. However, the preparation process is cumbersome, and good adhesion is exhibited after curing and placement for a week, and the initial adhesion is not significantly improved.

[0006] Therefore, in view of the problems existing in the silicone sealant primer in the prior art, it is particularly important to provide a silicone sealant primer that not only meets the performance of the existing silicone sealant primer but also has the ability to maintain high adhesion under extreme environments of low temperature and high humidity, which has good application value.

[0007] Summary of the Invention

[0008] Based on this, the present invention provides a modified silane coupling agent, which is used to prepare a silicone sealant primer. It maintains high reactivity at low temperatures, has good initial adhesion, can quickly form a film in a high-humidity environment, and has good water-resistant adhesion.

[0009] The first aspect of the present invention provides a modified silane coupling agent having the following structure:

[0010] Wherein, R is a C1-C4 alkyl group.

[0011] The second aspect of the present invention provides a modified silane coupling agent, which is obtained by a dealcoholization cyclization reaction of bis(allyldialkoxysilylpropyl)amine in the presence of a catalyst, wherein the bis(allyldialkoxysilylpropyl)amine is obtained by an amino substitution reaction of allylchloropropyldialkoxysilane and liquid ammonia, and the allylchloropropyldialkoxysilane is obtained by an alcohol substitution reaction of allylchloropropyldichlorosilane and a short-chain alcohol.

[0012] In some embodiments, the catalyst is composed of metallic nickel and an organic base in a mass ratio of (8-22):1, and the organic base is preferably sodium ethoxide.

[0013] In some embodiments, the short-chain alcohol is selected from C1-C4 saturated fatty alcohols. Preferably, the short-chain alcohol is selected from methanol or ethanol.

[0014] In some embodiments, the molar ratio of the allylchloropropyldichlorosilane to the short-chain alcohol is 1:(2-5), preferably 1:(3-3.8).

[0015] In some embodiments, the molar ratio of 1, allylchloropropyldialkoxysilane to liquid ammonia is 1:(0.5-3), preferably 1:(0.5-1).

[0016] In some embodiments, the mass ratio of the catalyst to the 2,bis(allyldialkoxysilylpropyl)amine is (0.001-0.01):1, preferably (0.0017-0.007):1.

[0017] The third aspect of the present invention is to provide a method for preparing a modified silane coupling agent, comprising the following steps:

[0018] (1) mixing allylchloropropyldichlorosilane with a short-chain alcohol, heating to 70-90° C. and reflux for 1-2 hours to obtain allylchloropropyldialkoxysilane;

[0019] (2) mixing the allylchloropropyldialkoxysilane and liquid nitrogen, introducing an inert gas, and reacting under constant temperature reflux at 60-70° C. for 1-2 hours to obtain bis(allyldialkoxysilylpropyl)amine;

[0020] (3) Adding a catalyst to the bis(allyldialkoxysilylpropyl)amine and reacting at 70-80° C. for 2.5-3.5 hours to obtain a modified silane coupling agent.

[0021] The fourth aspect of the present invention provides a silicone sealant primer, comprising the modified silane coupling agent.

[0022] In some embodiments, the raw materials of the silicone sealant primer include the following components in parts by weight:

[0023] In some embodiments, the raw materials of the silicone sealant primer include the following components in parts by weight:

[0024] In some embodiments, the raw materials of the silicone sealant primer include the following components in parts by weight:

[0025] In some embodiments, the adhesion promoter is selected from at least one of methyltrimethoxysilane and methyltriethoxysilane.

[0026] In some embodiments, the bonding catalyst is a titanate-based organometallic catalyst. Preferably, the bonding catalyst is selected from at least one of isopropyl titanate, n-butyl titanate, poly-n-butyl titanate, and isooctyl titanate.

[0027] In some embodiments, the solvent is a mixed solvent of solvent A and solvent B, the solvent A is isopropanol, the solvent B is xylene and / or acetone, and the weight ratio of the solvent A to the solvent B is 1:(1-2), preferably 1:(1.2-1.6).

[0028] The fifth aspect of the present invention provides a method for preparing a silicone sealant primer, comprising the following steps: adding a solvent, an adhesion promoter and an adhesion catalyst to a modified silane coupling agent, and mixing them uniformly to obtain the silicone sealant primer.

[0029] The modified silane coupling agent of the present invention contains functional groups such as nitrogen heterocycles, allyl groups, and siloxy groups in its structure. In a high-humidity environment, the nitrogen heterocycles are easily hydrolyzed and ring-opened to form secondary aminosilanes, which consume part of the moisture on the surface of the substrate. The secondary amino groups formed simultaneously can further promote the hydrolysis of siloxane into multiple silanols, and have rapid reaction capability. The multiple silanols have good compatibility with the inorganic surface of the substrate and can quickly form a film in a high-humidity environment. The allyl groups and secondary amino groups of the modified silane coupling agent react with the organic groups of the silicone sealant to form chemical bonds, effectively improving the compatibility between the organic components in the silicone sealant and the inorganic substances on the surface of the substrate, and achieving strong adhesion in a low-temperature environment.

[0030] The modified silane coupling agent preparation method of the present invention comprises the following steps: preparing allylchloropropyldichlorosilane by reacting with a short-chain alcohol to obtain allylchloropropyldialkoxysilane; reacting the allylchloropropyldialkoxysilane with liquid ammonia to obtain bis(allyldialkoxysilylpropyl)amine; and subjecting the bis(allyldialkoxysilylpropyl)amine to a dealcoholization cyclization reaction, thereby obtaining the modified silane coupling agent. The method has a simple synthesis process, mild reaction conditions, and is suitable for large-scale production.

[0031] The silicone sealant primer of the present invention can maintain high film-forming properties and adhesion in low-temperature, high-humidity environments, and has high reactivity and good initial adhesion. This overcomes the problems of uneven film formation and localized non-stickiness caused by reduced interfacial chemical reactivity and self-hydrolysis failure in low-temperature, high-humidity environments, thereby alleviating the limitations of the silicone sealant primer on the construction environment in practical applications. Furthermore, the silicone sealant primer utilizes the mutual solubility of isopropyl alcohol and water in the solvent to reduce the critical surface tension of the substrate in high-humidity environments, enhance compatibility with organic polymer materials, and thus strengthen bonding ability. DETAILED DESCRIPTION

[0032] The technical solutions of the present invention are further illustrated by specific examples below. Those skilled in the art should understand that the examples are only for helping to understand the present invention and should not be regarded as specific limitations of the present invention.

[0033] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0034] A method for preparing a modified silane coupling agent comprises the following steps:

[0035] (1) Allylchloropropyldichlorosilane is mixed with a short-chain alcohol, heated to 70-90°C and refluxed for 1-2 hours to obtain allylchloropropyldialkoxysilane (intermediate 1); the synthesis route is shown in Reaction I;

[0036] Wherein, the short-chain alcohol (R-OH) is a C1-C4 saturated fatty alcohol.

[0037] (2) The allylchloropropyldialkoxysilane (intermediate 1) and liquid nitrogen are mixed, an inert gas is introduced, and the mixture is refluxed at a constant temperature of 60-70° C. for 1-2 hours to obtain bis(allyldialkoxysilylpropyl)amine (intermediate 2); the synthesis route is shown in Reaction II.

[0038] (3) Add a catalyst to the bis(allyldialkoxysilylpropyl)amine (intermediate 2) and react at 70-80° C. for 2.5-3.5 hours to obtain a modified silane coupling agent; the synthesis route is shown in Reaction III.

[0039] Wherein, the catalyst is composed of metallic nickel and an organic base, and the organic base is preferably sodium ethoxide.

[0040] The following are specific examples.

[0041] Example 1

[0042] A method for preparing a modified silane coupling agent comprises the following steps:

[0043] (1) 326 parts of allylchloropropyldichlorosilane were taken in a four-necked flask, 160 parts of methanol were slowly added dropwise, and the mixture was stirred evenly after the addition. The mixture was heated to 80° C. and refluxed for 1 hour. Nitrogen was introduced to blow out the by-product hydrogen chloride gas to obtain allylchloropropyldialkoxysilane;

[0044] (2) After the material is cooled, 14 parts of liquid ammonia are slowly added, stirred evenly, and nitrogen is passed through. The mixture is refluxed at a constant temperature of 65°C for 1 hour, and then the temperature is raised to 85°C and purified by vacuum distillation to obtain bis(allyldialkoxysilylpropyl)amine;

[0045] (3) Transfer bis(allyldialkoxysilylpropyl)amine to a three-necked flask, add 0.2 parts of nickel powder and 0.02 parts of sodium ethoxide, stir evenly, heat to 75°C for 3 hours, and purify by vacuum distillation to obtain the product modified silane coupling agent. The product was analyzed by infrared spectroscopy, and the 875.3 cm-1 attributable to the Si-N bond was detected. -1 There is a strong peak at 1638.1cm assigned to the C=C bond. -1 There is a medium-strong peak at 1046.6 cm-1, which is attributed to the Si-OC bond. -1 There is a medium-strong peak, and there is no double peak attributed to the NH bond; it can be seen that the structural formula of the modified silane coupling agent is as follows:

[0046] A silicone sealant primer, comprising the following components in parts by weight:

[0047] The adhesion promoter is methyltrimethoxysilane, the bonding catalyst is isopropyl titanate, and the solvent is a mixture of isopropyl alcohol and xylene in a mass ratio of 1:1.2.

[0048] The preparation method of the silicone sealant primer comprises the following steps: taking the above-synthesized modified silane coupling agent, sequentially adding a solvent, an adhesion promoter, and an adhesion catalyst, stirring evenly to obtain the silicone sealant primer, and sealing and storing the mixture.

[0049] Example 2

[0050] A method for preparing a modified silane coupling agent comprises the following steps:

[0051] (1) 326 parts of allylchloropropyldichlorosilane were taken in a four-necked flask, 160 parts of methanol were slowly added dropwise, and the mixture was stirred evenly after the addition. The mixture was heated to 70° C. and refluxed for 1 hour. Nitrogen was introduced to blow out the by-product hydrogen chloride gas to obtain allylchloropropyldialkoxysilane;

[0052] (2) After the material is cooled, 23.8 parts of liquid ammonia are slowly added, stirred evenly, and nitrogen is passed through. The mixture is refluxed at a constant temperature of 60°C for 1 hour, and then the temperature is raised to 70°C and purified by vacuum distillation to obtain bis(allyldialkoxysilylpropyl)amine;

[0053] (3) Transfer bis(allyldialkoxysilylpropyl)amine to a three-necked flask, add 0.2 parts of nickel powder and 0.02 parts of sodium ethoxide, stir evenly, heat to 70°C and react for 3 hours, and purify by vacuum distillation to obtain the product modified silane coupling agent.

[0054] A silicone sealant primer, comprising the following components in parts by weight:

[0055] The adhesion promoter is methyltriethoxysilane, the bonding catalyst is n-butyl titanate, and the solvent is a mixture of isopropyl alcohol and acetone in a mass ratio of 1:1.6.

[0056] The preparation method of the silicone sealant primer comprises the following steps: taking the above-synthesized modified silane coupling agent, sequentially adding a solvent, an adhesion promoter, and an adhesion catalyst, stirring evenly to obtain the silicone sealant primer, and sealing and storing the mixture.

[0057] Example 3

[0058] A method for preparing a modified silane coupling agent comprises the following steps:

[0059] (1) 326 parts of allylchloropropyldichlorosilane were taken in a four-necked flask, 239 parts of ethanol were slowly added dropwise, and the mixture was stirred evenly after the addition. The mixture was heated to 90° C. and refluxed for 1 hour. Nitrogen was introduced to blow out the by-product hydrogen chloride gas to obtain allylchloropropyldialkoxysilane;

[0060] (2) After the material is cooled, 16 parts of liquid ammonia are slowly added, stirred evenly, and nitrogen is passed through. The mixture is refluxed at a constant temperature of 70°C for 1 hour, and then the temperature is raised to 100°C and purified by vacuum distillation to obtain bis(allyldialkoxysilylpropyl)amine;

[0061] (3) The bis(allyldialkoxysilylpropyl)amine was transferred to a three-necked flask, 0.1 parts of nickel powder and 0.005 parts of sodium ethoxide were added, stirred evenly, heated to 80°C for 3 hours, and purified by vacuum distillation to obtain the product modified silane coupling agent. The product was subjected to infrared spectroscopy analysis and testing, and the 871.5 cm-1 attributable to the Si-N bond was detected. -1 There is a strong peak at 1640.4 cm assigned to the C=C bond. -1 There is a medium-strong peak at 1048.4 cm-1, which is attributed to the Si-OC bond. -1 There is a medium-strong peak at 2975.8cm assigned to the NH bond. -1 、2927.2cm -1 Weak double peak; It can be seen that the structural formula of the modified silane coupling agent is as follows:

[0062] A silicone sealant primer, comprising the following components in parts by weight:

[0063] The adhesion promoter is methyltriethoxysilane, the bonding catalyst is tert-butyl titanate, and the solvent is a mixture of isopropyl alcohol and xylene in a mass ratio of 1:1.4.

[0064] The preparation method of the silicone sealant primer comprises the following steps: taking the above-synthesized modified silane coupling agent, sequentially adding a solvent, an adhesion promoter, and an adhesion catalyst, stirring evenly to obtain the silicone sealant primer, and sealing and storing the mixture.

[0065] Example 4

[0066] A silicone sealant primer, comprising the following components in parts by weight:

[0067] The modified silane coupling agent is the same as the modified silane coupling agent in Example 1;

[0068] The adhesion promoter is methyltrimethoxysilane, the bonding catalyst is isopropyl titanate, and the solvent is a mixture of isopropyl alcohol and xylene in a mass ratio of 1:1.4.

[0069] The preparation method of the silicone sealant primer comprises the following steps: taking the above-synthesized modified silane coupling agent, sequentially adding a solvent, an adhesion promoter, and an adhesion catalyst, stirring evenly to obtain the silicone sealant primer, and sealing and storing the mixture.

[0070] Example 5

[0071] A silicone sealant primer, comprising the following components in parts by weight:

[0072] The modified silane coupling agent is the same as the modified silane coupling agent of Example 3;

[0073] The adhesion promoter is methyltrimethoxysilane, the bonding catalyst is polybutyl titanate, and the solvent is xylene.

[0074] The preparation method of the silicone sealant primer comprises the following steps: taking the above-synthesized modified silane coupling agent, sequentially adding a solvent, an adhesion promoter, and an adhesion catalyst, stirring evenly to obtain the silicone sealant primer, and sealing and storing the mixture.

[0075] Comparative Example 1

[0076] The difference between the silicone sealant primer provided in this comparative example and Example 1 is that the silicone sealant primer provided in this comparative example comprises the following components in parts by weight:

[0077] The raw material components and preparation method of the silicone sealant primer are the same as those in Example 1.

[0078] Comparative Example 2

[0079] The difference between the silicone sealant primer provided in this comparative example and that in Example 1 is that the silane coupling agent used in this comparative example is 3-aminopropyltrimethoxysilane.

[0080] The amounts of the raw material components used in the above Examples 1-5 and Comparative Examples 1-2 are shown in Table 1 in parts by mass.

[0081] Table 1 Amounts of raw materials used in Examples and Comparative Examples

[0082] Performance Testing

[0083] The silicone sealant primers prepared in Examples 1-5 and Comparative Example 1 were subjected to adhesion tests on different substrates.

[0084] Experimental Method: Place the silicone sealant primer sample in a constant temperature and humidity chamber (10°C ± 0.2°C, 85% ± 5% humidity) for one day. After low-temperature, high-humidity treatment, remove the sample and apply it to the test substrate. After drying for 5 minutes, apply a two-component dealcoholized silicone structural sealant (purchased from Guangzhou Baiyun Chemical). After application, continue placing the sample in a constant temperature and humidity chamber (10°C ± 0.2°C, 85% ± 5% humidity) for 20 hours of low-temperature curing. Then, remove the sample and conduct a room-temperature peel test indoors. A control example was used, with the two-component dealcoholized silicone sealant applied directly instead of the silicone sealant primer. The test results are shown in Table 2.

[0085] Table 2 Test results of low temperature and high humidity adhesion between sealant and various substrates

[0086] As shown in Table 2, compared to the control example without primer, Examples 1-5 and Comparative Examples 1-2 exhibited greater cohesive failure values, indicating that the use of the silicone sealant primer significantly improved the adhesion of the silicone sealant under low-temperature, high-humidity conditions. The sealant in Example 1 exhibited 100% cohesive failure when bonded to various metal substrates, demonstrating extremely high bond strength between the sealant and the metal substrates, demonstrating the excellent low-temperature / high-humidity adhesion of the silicone sealant primer. Compared to Example 1, the cohesive failure areas in Examples 2 and 3 were somewhat smaller, and the primer film formation rate was slower. This is due to the reduced purity and reactivity of the modified silane coupling agent during the synthesis process, resulting in reduced adhesion under extreme conditions.

[0087] Comparing Examples 1 and 4, it can be seen that an appropriate amount of adhesion promoter and adhesion catalyst in the primer solution helps improve the adhesion of the primer. The primer solution in Example 5, which does not contain isopropyl alcohol, resulted in small areas of non-stickiness in the experimental sample. This is due to poor compatibility between the primer solution and the substrate after application.

[0088] The silane coupling agent content in Comparative Example 1 was low, resulting in a slow film-forming rate and large areas of non-stickiness. This indicates that the appropriate amount of modified silane coupling agent significantly impacts the primer's interfacial water-resistant adhesion and low-temperature initial bonding rate. Comparative Example 2, which uses 3-aminopropyltrimethoxysilane as a silane coupling agent, exhibits minimal cohesive failure. However, the primer's film-forming rate and initial bonding rate are too slow, demonstrating that conventional silane coupling agents fail to achieve strong adhesion in low-temperature, high-humidity environments.

[0089] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A modified silane coupling agent, characterized in that: It has the following structure: Wherein, R is a C1-C4 alkyl group.

2. A modified silane coupling agent, characterized in that: The bis(allyldialkoxysilylpropyl)amine is obtained by a dealcoholization cyclization reaction under the action of a catalyst, wherein the bis(allyldialkoxysilylpropyl)amine is obtained by an amino substitution reaction between allylchloropropyldialkoxysilane and liquid ammonia, and the allylchloropropyldialkoxysilane is obtained by an alcohol substitution reaction between allylchloropropyldichlorosilane and a short-chain alcohol.

3. The modified silane coupling agent according to claim 2, characterized in that: The catalyst is composed of metallic nickel and an organic base in a mass ratio of (8-22):1; and / or, The short-chain alcohol is selected from C1-C4 saturated fatty alcohols.

4. The modified silane coupling agent according to claim 3, characterized in that: The organic base is sodium ethoxide.

5. The modified silane coupling agent according to claim 3, characterized in that: The short-chain alcohol is selected from methanol or ethanol.

6. The modified silane coupling agent according to any one of claims 2 to 5, characterized in that: The molar ratio of the allylchloropropyldichlorosilane to the short-chain alcohol is 1:(2-5); and / or, The molar ratio of allylchloropropyldialkoxysilane to liquid ammonia is 1:(0.5-3); and / or, The mass ratio of the catalyst to the bis(allyldialkoxysilylpropyl)amine is (0.001-0.01):

1.

7. The modified silane coupling agent according to claim 6, characterized in that The molar ratio of the allylchloropropyldichlorosilane to the short-chain alcohol is 1:(3-3.8); and / or, The molar ratio of allylchloropropyldialkoxysilane to liquid ammonia is 1:(0.5-1); and / or, The mass ratio of the catalyst to the bis(allyldialkoxysilylpropyl)amine is (0.0017-0.007):

1.

8. A method for preparing the modified silane coupling agent according to any one of claims 1 to 7, characterized in that it comprises the following steps: (1) mixing allylchloropropyldichlorosilane with a short-chain alcohol, heating to 70-90° C. and reflux for 1-2 hours to obtain allylchloropropyldialkoxysilane; (2) mixing the allylchloropropyldialkoxysilane and liquid nitrogen, introducing an inert gas, and reacting under constant temperature reflux at 60-70° C. for 1-2 hours to obtain bis(allyldialkoxysilylpropyl)amine; (3) adding a catalyst to the bis(allyldialkoxysilylpropyl)amine and reacting at 70-80° C. for 2.5-3.5 hours to obtain a modified silane coupling agent.

9. A silicone sealant primer, characterized in that: The modified silane coupling agent comprises the modified silane coupling agent according to any one of claims 1 to 7.

10. The silicone sealant primer according to claim 9, characterized in that: The raw materials include the following components by weight:

11. The silicone sealant primer according to claim 10, characterized in that: The raw materials include the following components by weight:

12. The silicone sealant primer according to claim 11, characterized in that: The raw materials include the following components by weight:

13. The silicone sealant primer according to any one of claims 10 to 12, characterized in that: The adhesion promoter is selected from at least one of methyltrimethoxysilane and methyltriethoxysilane; and / or, The bonding catalyst is a titanate-based organometallic catalyst; and / or, The solvent is a mixed solvent of solvent A and solvent B, the solvent A is isopropanol, the solvent B is xylene and / or acetone, and the weight ratio of the solvent A to the solvent B is 1:(1-2).

14. The silicone sealant primer according to claim 13, characterized in that: The bonding catalyst is selected from at least one of isopropyl titanate, n-butyl titanate, polyn-butyl titanate and isooctyl titanate.

15. The silicone sealant primer according to claim 13, characterized in that: The weight ratio of the solvent A to the solvent B is 1:(1.2-1.6).

16. A method for preparing the silicone sealant primer according to any one of claims 10 to 15, characterized in that: The following steps are involved: The solvent, the adhesion promoter and the adhesion catalyst are added to the modified silane coupling agent and mixed evenly to obtain the silicone sealant primer liquid.

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