A primer for bonding polysulfide sealant under low temperature conditions and a method for preparing the same

Abstract

The application provides a primer for bonding polysulfide sealant under low temperature conditions and a preparation method thereof. The primer comprises the following components in parts by weight: solvent A 40-45 parts, organic metal ester compound mixture 5-15 parts, pigment 0.5-1 part, dispersant 0.5-1 part, and adhesion promoter 0.2-0.5 part. The primer prepared by the application has the advantages of fast surface drying time, long open time, long storage period, convenient construction and the like, and the primer prepared by the application has color, so that whether the primer is missed in construction can be easily distinguished, and the construction quality is further improved. The primer provided by the application solves the problem that the polysulfide sealant cannot be bonded to the surface of the anticorrosive coating when the polysulfide sealant is constructed outdoors in winter (0-10 DEG C), and the application field of the polysulfide sealant is expanded.

Description

Technical Field

[0001] This invention belongs to the field of polymer sealing materials, specifically relating to a primer for bonding polysulfide sealants under low-temperature conditions and its preparation method. Background Technology

[0002] Polysulfide sealant is a sealing material made by vulcanizing liquid polysulfide rubber with a curing agent. The abundant disulfide bonds in polysulfide rubber give it excellent corrosion resistance, aging resistance, low air permeability, and good processability. Therefore, polysulfide sealant has been widely used in the bridge construction field in recent years. When used in conjunction with anti-corrosion coatings, polysulfide sealant forms an anti-corrosion layer, preventing the entry of corrosive agents and thus protecting the bridge steel structure from external corrosion.

[0003] Generally, the safe application temperature for polysulfide sealants should be above 5℃, with optimal application conditions ranging from 15℃ to 40℃. When the ambient temperature is below 10℃, it is considered a low-temperature application environment. At this temperature, the interfacial adhesion between the polysulfide sealant and the anti-corrosion coating is significantly affected, particularly with a prolonged initial bonding time. In practical engineering applications, outdoor low-temperature application in winter (0℃ to 10℃) is unavoidable. Under low-temperature conditions, due to factors such as the slow reaction rate of the polysulfide sealant, reduced interfacial chemical reaction rate, increased viscosity of the polysulfide sealant, reduced wettability to the anti-corrosion coating surface, and the diversity of anti-corrosion coating components, the adhesion of the polysulfide sealant to the anti-corrosion coating essentially fails completely. Therefore, a primer is usually required to improve the interfacial adhesion between the polysulfide sealant and the anti-corrosion coating.

[0004] Through the applicant's testing and literature review, it was found that conventional silane coupling agent-based primers exhibit good interfacial adhesion to anticorrosive coatings when used with polysulfide sealant at room temperature. However, at low temperatures (0℃~10℃), the adhesion completely fails. This may be due to a mismatch in the formation rates of the bonding chemical bonds between the primer / polysulfide sealant and the primer / anticorrosive coating. Therefore, it is necessary to develop suitable primers to address the problem of poor interfacial adhesion between polysulfide sealant and anticorrosive coatings caused by low temperatures in practical engineering projects. Furthermore, on-site application revealed that most commercially available primers are transparent and colorless. When applied over various colored anticorrosive coatings, it is impossible to determine whether a primer has been applied, which is detrimental to controlling the quality of on-site application. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a primer for bonding polysulfide sealants under low-temperature conditions and its preparation method.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The first aspect of the present invention provides a primer for bonding polysulfide sealants under low-temperature conditions, comprising the following components in parts by weight:

[0008]

[0009]

[0010] In an optional embodiment, solvent A is at least one selected from xylene, toluene, and acetone.

[0011] In an optional embodiment, the organometallic ester compound mixture is 8 to 10 parts by weight.

[0012] In an optional embodiment, the organometallic ester compound mixture is prepared by uniformly mixing an organometallic ester compound, a silane coupling agent, and solvent B.

[0013] In an optional embodiment, the mass ratio of the organometallic lipid compound, the silane coupling agent, and solvent B is (1.2–2):1:(13–15).

[0014] In an optional embodiment, the organometallic lipid compound is at least one of acetylacetone diisopropyl aluminum complex and isopropoxy aluminum distearate.

[0015] In an optional embodiment, the silane coupling agent is at least one of mercaptosilane coupling agents and epoxysilane coupling agents.

[0016] In an optional embodiment, the mercaptosilane coupling agent is at least one of 3-mercaptopropylmethyldimethoxysilane and 3-mercaptopropyltrimethoxysilane.

[0017] In an optional embodiment, the epoxy silane coupling agent is at least one of 3-glycidoxypropyltriethoxysilane and 3-glycidoxypropyltrimethoxysilane.

[0018] In an optional embodiment, solvent B is prepared by uniformly mixing solvent C with phenolic resin, wherein the phenolic resin is present in a weight ratio of 0.5 to 1 part.

[0019] In an optional embodiment, the mass ratio of solvent C to phenolic resin is (40-45):1.

[0020] In an optional embodiment, the solvent C is at least one of xylene, toluene, and acetone.

[0021] In an optional embodiment, the phenolic resin is at least one of tert-butylphenol formaldehyde tackifying resin and alkylphenol formaldehyde tackifying resin.

[0022] In an optional embodiment, the pigment is carbon black.

[0023] In an optional embodiment, the dispersant is at least one of BYK-161, BYK-162, and BYK-2155.

[0024] In an optional embodiment, the adhesion promoter is a silane compound containing an epoxy group; the epoxy group silane compound is at least one of Adherant 1051 and ADP-S476.

[0025] A second aspect of the present invention provides a method for preparing the primer described in the first aspect, comprising the following steps:

[0026] Step 1: Place solvent D, dispersant and pigment together in a grinding kettle and grind them until uniform to obtain a color paste; the solvent D is at least one of xylene, toluene and acetone;

[0027] Step 2: Stir solvent C and phenolic resin at 30℃~40℃ until they are mixed evenly to obtain solvent B;

[0028] Step 3: Add silane coupling agent to solvent B, continue stirring, then add organometallic ester compound, continue stirring, and after mixing evenly, obtain organometallic ester compound mixture;

[0029] Step 4: Mix solvent A, color paste, organometallic ester compound mixture, and adhesion promoter, and stir until evenly mixed to obtain the primer.

[0030] In an optional embodiment, the pigment described in step one needs to be baked at a high temperature before use; the high temperature baking temperature is 120℃~140℃, and the time is 2~4h.

[0031] In an optional embodiment, the solvent D in step one is 1 to 2 parts by weight; the solvent C in step two is 40 to 45 parts by weight; and the solvent A in step four is 40 to 45 parts by weight.

[0032] In an optional embodiment, cooling water is used to cool the organometallic ester compound mixture in step three.

[0033] In an optional implementation, cooling water is used for cooling during the primer preparation process in step four.

[0034] In an optional embodiment, the stirring speed in step three is 20-30 Hz, and the stirring time is 5-15 min.

[0035] In an optional embodiment, the stirring speed in step four is 40-45 Hz, and the stirring time is 10-30 min.

[0036] The beneficial effects achieved by this invention are as follows:

[0037] (1) During construction in low-temperature environments, due to various factors such as the slow reaction rate of polysulfide sealant, reduced interfacial chemical reaction rate, increased viscosity of polysulfide sealant, reduced wettability of anti-corrosion coating surface, and the diversity of anti-corrosion coating components, the adhesion of polysulfide sealant to anti-corrosion coating is basically completely ineffective. The primer formulation of this invention is designed based on adhesive theory. Phenolic resin easily forms hydrogen bonds, which can improve polarity and enhance the wettability of the primer. Anti-corrosion coatings contain a large amount of zinc or iron, and the metal surface has free electrons (outer electrons), which easily form coordination bonds with mercapto, epoxy, hydroxymethyl, etc. in organometallic lipid mixtures. Organometallic lipid compounds and adhesion promoters significantly increase the formation rate of bonding chemical bonds between the primer and polysulfide sealant. The primer provided by this invention has excellent properties such as short surface drying time, long open time, long shelf life, and convenient construction. Therefore, the primer prepared by this invention achieves complete adhesion of polysulfide sealant to anti-corrosion coating under low temperature conditions by specifically increasing wettability and bonding speed, thereby solving the problem of polysulfide sealant not adhering to the surface of anti-corrosion coating during outdoor construction in winter (0℃~10℃), and expanding the application field of polysulfide sealant.

[0038] (2) The primer prepared by the present invention has color, making it easy to identify whether there is any omission during construction, which further improves the construction quality. Detailed Implementation

[0039] The technical solution of the present invention will be described in detail below with reference to specific embodiments and comparative examples. It should be understood that the following embodiments are only a part of the embodiments of the present invention, used to explain the technical solution of the present invention, and are not intended to limit the present invention. Based on the description of the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1: Effect of each component of the organometallic ester compound mixture on the performance of the primer prepared according to the present invention

[0041] Example 1.1

[0042] This embodiment prepares a primer for bonding polysulfide sealants under low-temperature conditions, and the preparation steps are as follows:

[0043] Step 1: Bake Cabot 880 carbon black with high specific surface area in a high-temperature oven at 140℃ for 2 hours; place the baked pigment carbon black, xylene solvent and BYK-161 in a grinding kettle, grind and stir evenly to obtain a color paste;

[0044] Step 2: Mix toluene solvent and tert-butylphenol formaldehyde tackifying resin, and stir evenly at 30℃~40℃ to obtain a polar solvent;

[0045] Step 3: Under the stirring state of polar solvent, 3-mercaptopropyltrimethoxysilane and 3-glycidoxypropyltrimethoxysilane were added successively and stirred for 10 min. Then, acetylacetone diisopropylaluminum complex was added and stirred for 10 min to obtain organometallic ester complex mixture. The entire process was cooled with cooling water.

[0046] Step 4: Mix acetone solvent, color paste, organometallic ester compound mixture and adhesion promoter, and stir at 40-45 Hz for 20 minutes to obtain the primer; the entire process is cooled with cooling water.

[0047] The dosage of each component in this embodiment is detailed in Table 1.

[0048] The primer, polysulfide sealant, epoxy zinc-rich primer spray plate, and epoxy micaceous iron oxide intermediate paint spray plate prepared in this embodiment were pre-conditioned at three experimental ambient temperatures (23±2℃, 10±2℃, and 0±2℃) for at least 24 hours. Then, experiments were conducted according to Method B of Appendix D.1.2 of GB 16776 under each experimental ambient temperature condition. The primer prepared in this embodiment was applied to the surface of the epoxy zinc-rich primer spray plate and the epoxy micaceous iron oxide intermediate paint spray plate, dried for 10 minutes, and then polysulfide sealant was applied. Curing was then carried out for 14 days under each experimental ambient temperature condition, simulating outdoor construction in winter and application and curing under low-temperature conditions. The test results are shown in Table 2.

[0049] Example 1.2

[0050] This embodiment prepares a primer for bonding polysulfide sealants under low-temperature conditions, and the preparation steps are as follows:

[0051] Step 1: Bake Cabot 880 carbon black with high specific surface area in a high-temperature oven at 140℃ for 2 hours; place the baked pigment carbon black, xylene solvent and BYK-161 in a grinding kettle, grind and stir evenly to obtain a color paste;

[0052] Step 2: Mix toluene solvent and tert-butylphenol formaldehyde tackifying resin, and stir evenly at 30℃~40℃ to obtain a polar solvent;

[0053] Step 3: Under the stirring state of polar solvent, 3-mercaptopropylmethyldimethoxysilane and 3-glycidoxypropyltriethoxysilane are added successively and stirred for 10 min. Then, isopropoxyaluminum distearate is added and stirred for 10 min to obtain organometallic ester compound mixture. The entire process is cooled with cooling water.

[0054] Step 4: Mix acetone solvent, color paste, organometallic ester compound mixture and adhesion promoter, and stir at 40-45 Hz for 20 minutes to obtain the primer; the entire process is cooled with cooling water.

[0055] The dosage of each component in this embodiment is detailed in Table 1.

[0056] The primer, polysulfide sealant, epoxy zinc-rich primer spray plate, and epoxy micaceous iron oxide intermediate paint spray plate prepared in this embodiment were pre-conditioned at three experimental ambient temperatures (23±2℃, 10±2℃, and 0±2℃) for at least 24 hours. Then, experiments were conducted according to Method B of Appendix D.1.2 of GB 16776 under each experimental ambient temperature condition. The primer prepared in this embodiment was applied to the surface of the epoxy zinc-rich primer spray plate and the epoxy micaceous iron oxide intermediate paint spray plate, dried for 10 minutes, and then polysulfide sealant was applied. Curing was then carried out for 14 days under each experimental ambient temperature condition, simulating outdoor construction in winter and application and curing under low-temperature conditions. The test results are shown in Table 2.

[0057] Example 1.3

[0058] This embodiment prepares a primer for bonding polysulfide sealants under low-temperature conditions, and the preparation steps are as follows:

[0059] Step 1: Bake Cabot 880 carbon black with high specific surface area in a high-temperature oven at 140℃ for 2 hours; place the baked pigment carbon black, xylene solvent and BYK-161 in a grinding kettle, grind and stir evenly to obtain a color paste;

[0060] Step 2: Mix toluene solvent and alkylphenol formaldehyde tackifying resin, and stir evenly at 30℃~40℃ to obtain a polar solvent;

[0061] Step 3: Under polar solvent stirring, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-glycidyl etheroxypropyltriethoxysilane, and epoxysilane coupling agent are added sequentially and stirred for 10 min. Then, isopropoxyaluminum distearate and acetylacetone diisopropylaluminum complex are added and stirred for 10 min to obtain organometallic ester complex mixture. This process is cooled with cooling water throughout.

[0062] Step 4: Mix acetone solvent, color paste, organometallic ester compound mixture and adhesion promoter, and stir at 40-45 Hz for 20 minutes to obtain the primer; the entire process is cooled with cooling water.

[0063] The dosage of each component in this embodiment is detailed in Table 1.

[0064] The primer, polysulfide sealant, epoxy zinc-rich primer spray plate, and epoxy micaceous iron oxide intermediate paint spray plate prepared in this embodiment were pre-conditioned at three experimental ambient temperatures (23±2℃, 10±2℃, and 0±2℃) for at least 24 hours. Then, experiments were conducted according to Method B of Appendix D.1.2 of GB 16776 under each experimental ambient temperature condition. The primer prepared in this embodiment was applied to the surface of the epoxy zinc-rich primer spray plate and the epoxy micaceous iron oxide intermediate paint spray plate, dried for 10 minutes, and then polysulfide sealant was applied. Curing was then carried out for 14 days under each experimental ambient temperature condition, simulating outdoor construction in winter and application and curing under low-temperature conditions. The test results are shown in Table 2.

[0065] Example 1.4

[0066] This embodiment prepares a primer for bonding polysulfide sealants under low-temperature conditions, and the preparation steps are as follows:

[0067] Step 1: Bake Cabot 880 carbon black with high specific surface area in a high-temperature oven at 140℃ for 2 hours; place the baked pigment carbon black, xylene solvent and BYK-161 in a grinding kettle, grind and stir evenly to obtain a color paste;

[0068] Step 2: Mix toluene solvent and alkylphenol formaldehyde tackifying resin, and stir evenly at 30℃~40℃ to obtain a polar solvent;

[0069] Step 3: Under the stirring state of polar solvent, 3-mercaptopropyltrimethoxysilane and 3-glycidyl etheroxypropyltrimethoxysilane are added successively and stirred for 10 min. Then, acetylacetone diisopropylaluminum complex is added and stirred for 10 min to obtain organometallic ester complex mixture. The entire process is cooled with cooling water.

[0070] Step 4: Mix acetone solvent, color paste, organometallic ester compound mixture and adhesion promoter, and stir at 40-45 Hz for 20 minutes to obtain the primer; the entire process is cooled with cooling water.

[0071] The dosage of each component in this embodiment is detailed in Table 1.

[0072] The primer, polysulfide sealant, epoxy zinc-rich primer spray plate, and epoxy micaceous iron oxide intermediate paint spray plate prepared in this embodiment were pre-conditioned at three experimental ambient temperatures (23±2℃, 10±2℃, and 0±2℃) for at least 24 hours. Then, experiments were conducted according to Method B of Appendix D.1.2 of GB 16776 under each experimental ambient temperature condition. The primer prepared in this embodiment was applied to the surface of the epoxy zinc-rich primer spray plate and the epoxy micaceous iron oxide intermediate paint spray plate, dried for 10 minutes, and then polysulfide sealant was applied. Curing was then carried out for 14 days under each experimental ambient temperature condition, simulating outdoor construction in winter and application and curing under low-temperature conditions. The test results are shown in Table 2.

[0073] Comparative Example 1

[0074] This comparative example prepared a conventional silane coupling agent primer, and the preparation steps are as follows:

[0075] The primer is obtained by mixing acetone solvent, 3-mercaptopropylmethyldimethoxysilane, tert-butylphenol formaldehyde tackifying resin, and ADP-S476 and stirring at 40-45 Hz for 20 minutes.

[0076] The amounts of each component used in this comparative example are detailed in Table 1.

[0077] The primer, polysulfide sealant, epoxy zinc-rich primer, and epoxy micaceous iron oxide intermediate coat prepared in this comparative example were pre-conditioned at three experimental ambient temperatures (23±2℃, 10±2℃, and 0±2℃) for at least 24 hours. Then, experiments were conducted according to Method B of Appendix D.1.2 of GB 16776 under each experimental ambient temperature condition. The primer prepared in this comparative example was applied to the surface of the epoxy zinc-rich primer and epoxy micaceous iron oxide intermediate coats, dried for 10 minutes, and then polysulfide sealant was applied. Curing was then carried out for 14 days under each experimental ambient temperature condition, simulating outdoor construction in winter and application and curing under low-temperature conditions. The test results are shown in Table 2.

[0078] The amounts of each component used in the primer preparation steps of Examples 1-4 and Comparative Example 1.1 are shown in Table 1, and no primer is set as a blank example.

[0079] Table 1. Dosage of each component in the preparation of the primer in the examples and comparative examples

[0080]

[0081]

[0082] Table 2. Performance test results of primers in examples and comparative examples

[0083]

[0084] Note: CF represents cohesive failure, and a larger value indicates a better bonding effect; AF represents interface failure, and a smaller value indicates a better bonding effect.

[0085] As shown in Table 2, in the blank example without primer, the polysulfide sealant failed to bond with the anti-corrosion coating. The conventional silane coupling agent primer (Comparative Example 1) maintained good bonding between the polysulfide sealant and the anti-corrosion coating under normal temperature conditions, but the bonding performance was basically lost under the two low temperature conditions. The primer prepared by this invention can maintain good bonding performance between the polysulfide sealant and the anti-corrosion coating under three environmental temperature conditions: normal temperature, low temperature (10±2℃), and low temperature (0±2℃).

[0086] Furthermore, when the performance of the primers prepared in Examples 1.1 to 1.4 was tested, it was found that the primers exhibited good adhesion to the anti-corrosion coatings after the drying time was extended to 60 minutes. Even after the primers prepared in Examples 1.1-1.4 were stored at room temperature and protected from light for 6 months, their adhesion to the anti-corrosion coatings remained good.

[0087] Example 2: Effect of silane coupling agent on the performance of the primer of the present invention

[0088] Example 2.1

[0089] This embodiment prepares a primer for bonding polysulfide sealants under low-temperature conditions, and the preparation steps are as follows:

[0090] Step 1: Bake Cabot 880 carbon black with high specific surface area in a high-temperature oven at 140℃ for 2 hours; place the baked pigment carbon black, xylene solvent and dispersant BYK-161 in a grinding kettle, grind and stir evenly to obtain a color paste;

[0091] Step 2: Mix toluene solvent and alkylphenol formaldehyde tackifying resin, and stir evenly at 30℃~40℃ to obtain a polar solvent;

[0092] Step 3: Under polar solvent stirring conditions, add acetylacetone diisopropyl aluminum complex, acetone solvent, color paste, and ADP-S476. Stir at 40-45 Hz for 20 minutes to obtain the primer. Cool with cooling water throughout the process.

[0093] The dosage of each component in this embodiment is detailed in Table 3.

[0094] The primer, polysulfide sealant, epoxy zinc-rich primer sprayed panels, and epoxy micaceous iron oxide intermediate paint sprayed panels prepared in this comparative example were pre-conditioned at three experimental ambient temperatures: room temperature (23±2℃), low temperature (10±2℃), and low temperature (0±2℃) for at least 24 hours. Then, experiments were conducted according to Method B of Appendix D.1.2 of GB 16776 under each experimental ambient temperature condition. The primer prepared in this comparative example was applied to the surface of the epoxy zinc-rich primer sprayed panels and the epoxy micaceous iron oxide intermediate paint sprayed panels. After drying for 10 minutes, polysulfide sealant was applied. Curing was then carried out for 14 days under each experimental ambient temperature condition, simulating outdoor construction in winter and application and curing under low-temperature conditions. The test results are shown in Table 4.

[0095] Example 2.2

[0096] This embodiment prepares a primer for bonding polysulfide sealants under low-temperature conditions, and the preparation steps are as follows:

[0097] Step 1: Bake Cabot 880 carbon black with high specific surface area in a high-temperature oven at 140℃ for 2 hours; place the baked pigment carbon black, xylene solvent and BYK-161 in a grinding kettle, grind and stir evenly to obtain a color paste;

[0098] Step 2: Mix toluene solvent and alkylphenol formaldehyde tackifying resin, and stir evenly at 30℃~40℃ to obtain a polar solvent;

[0099] Step 3: Under polar solvent stirring, add aluminum isopropoxy distearate, acetone solvent, color paste, and ADP-S476. Stir at 40-45 Hz for 20 minutes to obtain the primer. Cool with cooling water throughout the process.

[0100] The dosage of each component in this embodiment is detailed in Table 3.

[0101] The primer, polysulfide sealant, epoxy zinc-rich primer sprayed panels, and epoxy micaceous iron oxide intermediate paint sprayed panels prepared in this comparative example were pre-conditioned at three experimental ambient temperatures: room temperature (23±2℃), low temperature (10±2℃), and low temperature (0±2℃) for at least 24 hours. Then, experiments were conducted according to Method B of Appendix D.1.2 of GB 16776 under each experimental ambient temperature condition. The primer prepared in this comparative example was applied to the surface of the epoxy zinc-rich primer sprayed panels and the epoxy micaceous iron oxide intermediate paint sprayed panels. After drying for 10 minutes, polysulfide sealant was applied. Curing was then carried out for 14 days under each experimental ambient temperature condition, simulating outdoor construction in winter and application and curing under low-temperature conditions. The test results are shown in Table 4.

[0102] Table 3. Dosage of each component in the preparation of the primer in Examples 1.1 and 2.1-2.2

[0103] Components (parts by mass) Example 1.1 Example 2.1 Example 2.2 Toluene 44 44 44 acetone 44 44 44 xylene 1 1 1 tert-butylphenol formaldehyde tackifying resin 0.5 0.5 0.5 3-Mercaptopropylmethyldimethoxysilane / / / 3-Mercaptopropyltrimethoxysilane 2 / / 3-Glycidyl etheroxypropyltriethoxysilane / / / 3-Glycidyl etheroxypropyltrimethoxysilane 1 / / Isopropoxyaluminum distearate / / 9 Acetylacetone diisopropylaluminum complex 6 9 / Pigment carbon black 0.5 0.5 0.5 BYK-161 0.5 0.5 0.5 ADP-S476 0.5 0.5 0.5

[0104] Table 4. Performance test results of primers in Examples 1.1 and 2.1-2.2

[0105]

[0106] Note: CF represents cohesive failure, and a larger value indicates a better bonding effect; AF represents interface failure, and a smaller value indicates a better bonding effect.

[0107] As shown in Table 4, in Examples 2.1–2.2 without the addition of silane coupling agent, the adhesion performance of the polysulfide sealant to the anti-corrosion coating board was essentially lost under three environmental temperature conditions: room temperature, low temperature (10±2℃), and low temperature (0±2℃). Therefore, in the primer of this invention, the silane coupling agent plays a dominant role in its adhesion, while other components play a crucial role in adhesion under low temperature conditions.

[0108] In summary, the primer prepared by this invention possesses excellent properties such as fast surface drying time, long open time, long shelf life, and convenient application, solving the problem of polysulfide sealant not adhering to the surface of anti-corrosion coatings during outdoor application in winter (0℃~10℃). Furthermore, the primer prepared by this invention is colored, making it easy to identify any missed areas during application, further improving the quality of the application.

Claims

1. A primer for poly-sulfide sealant bonding under cryogenic conditions, characterized in that, Parts by weight, including the following components: Solvent A 40-45 parts; Pigment 0.5-1 part; Dispersant 0.5-1 part; Organometallic ester complex mixture 5-15 parts; Adhesion promoter 0.2-0.5 parts; The organic metal ester complex mixture is compounded by an organic metal fatty compound, a silane coupling agent and a solvent B; the organic metal fatty compound is at least one of acetylacetone diisopropyl aluminum complex, isopropoxy aluminum distearate; the silane coupling agent is at least one of mercapto silane coupling agent, epoxy silane coupling agent; The mass ratio of the organic metal fatty compound, the silane coupling agent and the solvent B is (1.2-2):1:(13-15); The solvent B is compounded by a solvent C and a phenolic resin; the mass ratio of the solvent C and the phenolic resin is (40-45):1; The solvent C is at least one of xylene, toluene, acetone; the phenolic resin is at least one of t-butyl phenol formaldehyde tackifying resin, alkyl phenol formaldehyde tackifying resin; The solvent A is at least one of xylene, toluene, acetone; the adhesion promoter is an epoxy silane compound.

2. The base coat of claim 1, wherein The epoxy silane compound is at least one of Adherant 1051, ADP-S476.

3. The base coat of claim 1 wherein, The mercapto silane coupling agent is at least one of 3-mercaptopropyl methyl dimethoxy silane, 3-mercaptopropyl trimethoxy silane; the epoxy silane coupling agent is at least one of 3-glycidyl ether oxygen propyl triethoxy silane, 3-glycidyl ether oxygen propyl trimethoxy silane.

4. The basecoat of claim 1, wherein The pigment is pigment carbon black; the dispersant is at least one of BYK-161, BYK-162, BYK-2155.

5. A process for the preparation of the primer coating according to claim 1, characterized in that, Including the following steps: Step one: the solvent D, the dispersant and the pigment are placed in a grinding kettle and ground and stirred uniformly to obtain a color paste; the solvent D is at least one of xylene, toluene, acetone; Step two: the solvent C and the phenolic resin are stirred at 30-40 DEG C to mix uniformly to obtain a solvent B; Step three: the silane coupling agent is added to the solvent B, and stirring is continued, and then the organic metal fatty compound is added, and after mixing uniformly, an organic metal ester complex mixture is obtained; Step four: the solvent A, the color paste, the organic metal ester complex mixture and the adhesion promoter are mixed and stirred uniformly to obtain a primer.

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