Vinyl borate modified acrylic resin film-forming agent and preparation method thereof, and universal primer

Abstract

The present invention discloses a vinyl borate-modified acrylic resin film-forming agent, a preparation method thereof, and a universal primer. The film-forming agent is obtained by modifying and polymerizing a (meth)acrylate monomer with a double-bond silane coupling agent and vinyl borate. The film-forming agent, silane coupling agent, catalyst, and solvent are prepared into the universal primer. The present invention combines the effective adhesiveness of the acrylic structure itself, the tackifying property of the boron atom in the borate structure, and the good adhesion of the silane coupling agent to the substrate. The resulting film-forming material is prepared into a primer. Moreover, by combining different monomers in the film-forming agent and different primer components, the film-forming agent exhibits good adhesion to various common types of adhesives and various substrates, greatly expanding the application range of the sealant.

Description

Technical Field

[0001] The present application relates to acrylic resin synthesis and related application fields, and relates to a vinyl borate-modified acrylic resin, a synthesis method, and a primer with improved universality. Background Art

[0002] In the field of adhesives, primers are widely used. Primers are generally composed of film-forming materials, solvents, additives, catalysts, and pigments. For some colloids with poor adhesion to the substrate, primers greatly improve the adhesion of the colloid to the substrate and broaden the application range of the colloid.

[0003] Currently, there are many excellent primers on the market that can significantly improve the adhesion of adhesives to certain substrates. However, the bonding performance of different colloids and substrates varies slightly, resulting in a large and diverse range of primer types. Some primers also have the disadvantages of harsh operating conditions and slow curing speeds, which greatly limit their use. Currently, there is an urgent need to develop primers with universal performance that can simultaneously improve the adhesion of multiple colloids to common substrates such as metals, plastics, and inorganic materials. Summary of the Invention

[0004] In order to improve the adhesion performance of various colloids to common substrates such as metals, plastics, and inorganic materials, the present invention provides a method for synthesizing a vinyl borate-modified acrylic resin and a primer for improving universal adhesion.

[0005] The present invention provides a vinyl borate modified acrylic resin as a film-forming agent, which includes the following raw materials and their weight fractions:

[0006] (Meth)acrylate monomer: 17-30 parts;

[0007] Silane coupling agent with double bond: 1 to 5 parts;

[0008] Vinyl borate: 7-15 parts;

[0009] Initiator: 0.2-0.5 parts;

[0010] Inhibitor: 0.02-0.05 parts;

[0011] Solvent: 30-55 parts.

[0012] The (meth)acrylate monomers are selected from two or more of methyl acrylate, ethyl acrylate, tert-butyl acrylate, cyclohexyl acrylate, isobornyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, butyl methacrylate, and isobutyl methacrylate, with methyl methacrylate and methyl acrylate being more preferred. There are no strict requirements for the ratio of methyl methacrylate to methyl acrylate. Optionally, the mass of methyl methacrylate is 2 to 6 times that of methyl acrylate.

[0013] The double bond silane coupling agent is one of acryloxytrimethylsilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, vinyltrimethoxysilane, and vinyltriethoxysilane, and is more preferably 3-methacryloxypropyltriethoxysilane or 3-methacryloxypropyltrimethoxysilane.

[0014] The vinyl borate has the following general structural formula:

[0015]

[0016] In the above formula, B is a boron atom;

[0017] R1 is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, or two R1s of OR1 are linked to form an alkylene group having 2 to 20 carbon atoms;

[0018] L is a group having a double bond.

[0019] One of vinyl boronic acid pinacol ester, 2-tert-butyl-e-vinyl boronic acid pinacol ester, and 2,2-dimethyl vinyl boronic acid pinacol ester can be selected, and vinyl boronic acid pinacol ester is more preferred.

[0020] The initiator is selected from one of benzoyl peroxide, azobisisobutyronitrile and azobisisoheptanenitrile, and is more preferably azobisisobutyronitrile.

[0021] The polymerization inhibitor is selected from one of hydroquinone, p-benzoquinone and p-hydroxyanisole, and hydroquinone is more preferably selected.

[0022] The solvent is selected from one or more of ethyl acetate, butyl acetate, toluene, xylene, and dichloroethane, and butyl acetate is more preferred.

[0023] The synthesis method of the vinyl borate modified acrylic resin described in this application adopts the following synthesis steps:

[0024] The entire solvent is added to a reactor equipped with a stirring, reflux, and dripping device; a (meth)acrylate monomer, a double-bond silane coupling agent, a vinyl borate, and an initiator are uniformly mixed to obtain a monomer mixture, which is added to a dropping funnel and heated to 75-85° C.; 10%-40% by volume of the monomer mixture is added to the reactor and reacted for 0.5-1 hour; the remaining monomer mixture is then added dropwise for 1-2 hours; after the addition is complete, the mixture is kept warm for 1-3 hours, the temperature is lowered to 55-65° C., the mixture is kept warm for 1-3 hours, a polymerization inhibitor is added, and the mixture is reacted for 1-2 hours; and after the reaction is completed, the mixture is cooled and discharged to obtain the vinyl borate modified acrylic resin film-forming agent.

[0025] The present invention provides a method for preparing a universal primer, which comprises the following components in parts by mass:

[0026] Film-forming agent: 35-50 parts;

[0027] Silane coupling agent: 2-4 parts

[0028] Catalyst: 0.02-0.1 parts

[0029] Solvent: 35-50 parts.

[0030] The prepared film-forming agent, silane coupling agent, catalyst and solvent are mixed at room temperature, stirred evenly to prepare a primer, and stored in a sealed container for use.

[0031] The silane coupling agent is one or more of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropylmethyldiethoxysilane, N-β-(aminoethyl)-γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldiethoxysilane, γ-glycidylpropyltrimethoxysilane, γ-glycidylpropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, and γ-(2,3-epoxypropyloxy)propyltrimethoxysilane, and is more preferably γ-(2,3-epoxypropyloxy)propyltrimethoxysilane and N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane.

[0032] The catalyst is one of dibutyltin dilaurate, stannous octoate and tetrabutyl titanate, and is more preferably dibutyltin dilaurate.

[0033] The solvent is selected from one or more of ethyl acetate, butyl acetate, toluene, xylene, and dichloroethane, and is more preferably ethyl acetate.

[0034] The application of the primer is to first use absorbent cotton or a small brush dipped in a small amount of alcohol to clean the surface of the substrate to remove oil stains on the surface of the substrate to avoid affecting the adhesion. After the surface of the substrate is dry, use absorbent cotton or a small brush to dip in the primer and evenly apply it on the surface of the substrate. Wait for 5-10 minutes. After the primer is dry, the sealant can be applied to the surface of the substrate after the primer treatment.

[0035] Compared with the existing technology, the present invention has at least the following advantages:

[0036] (1) The molecular structure is designed based on the bonding mechanism, combining the effective bonding of the acrylic structure itself, the viscosity-enhancing property of the boron atom in the borate structure, and the good bonding property of the silane coupling agent to the substrate. The resulting film-forming material is formulated into a primer. Moreover, by combining different monomers in the film-forming agent and different components of the primer, it has good bonding properties to various common types of glue and various substrates, so that the colloid, primer, and substrate form a solid whole, which greatly expands the application range of the sealant.

[0037] (2) The preparation process of the present invention is simple. After the film-forming agent is synthesized, the various components of the primer need only to be mixed evenly. The use conditions are convenient. The primer can be applied after simply cleaning the substrate. The primer dries quickly and the glue can be applied after a few minutes. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below in conjunction with specific embodiments. The embodiments described below are only part of the embodiments of the present invention and are used to explain the present invention, but not all embodiments.

[0040] Embodiment 1:

[0041] (1) Components and preparation of film-forming agents

[0042] Table 1 Film-forming agent components and dosage

[0043] raw material Dosage (parts by mass) Methyl methacrylate 17 Methyl acrylate 5 3-Methacryloxypropyltriethoxysilane 2 Vinylboronic acid pinacol ester 10 Azobisisobutyronitrile 0.3 hydroquinone 0.03 Butyl acetate 34

[0044] The solvent butyl acetate is completely added to a reactor equipped with a stirring, reflux, and dripping device; methyl methacrylate, methyl acrylate, vinylboronic acid pinacol ester, 3-methacryloyloxypropyltriethoxysilane, and azobisisobutyronitrile are uniformly mixed to obtain a monomer mixture, which is added to a dropping funnel and heated to 80° C.; 20% of the volume of the monomer mixture is added to the reactor and reacted for 30 minutes; then the remaining monomer mixture is added dropwise for 2 hours, the temperature is kept for reaction for 1 hour, and the temperature is lowered to 60° C. for reaction for 3 hours; and hydroquinone is added and reacted for 1 hour to obtain a film-forming agent.

[0045] (2) Preparation of primer

[0046] 35 parts by mass of the film-forming agent prepared above, 2 parts by mass of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, 1 part by mass of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and 0.02 parts by mass of dibutyltin dilaurate were added sequentially to 35 parts by mass of ethyl acetate and mixed uniformly at room temperature to obtain primer 1. The obtained primer was divided into sealed containers and set aside.

[0047] Example 2:

[0048] (1) Components and preparation of film-forming agents

[0049] Table 2 Film-forming agent components and dosage

[0050] raw material Dosage (parts by mass) Methyl methacrylate 16 Methyl acrylate 4 3-Methacryloxypropyltrimethoxysilane 3 Vinylboronic acid pinacol ester 7 Azobisisobutyronitrile 0.2 hydroquinone 0.02 Butyl acetate 30

[0051] All the solvents were added to a reactor equipped with a stirring, reflux, and dripping device; methyl methacrylate, methyl acrylate, vinylboronic acid pinacol ester, 3-methacryloyloxypropyltrimethoxysilane, and azobisisobutyronitrile were uniformly mixed to obtain a monomer mixture, which was added to a dropping funnel and heated to 85° C.; 20% of the volume of the monomer mixture was added to the reactor and reacted for 30 minutes; the remaining monomer mixture was added dropwise for 2 hours, the temperature was kept for reaction for 1 hour, and the temperature was lowered to 65° C. for reaction for 3 hours; and hydroquinone was added and reacted for 1 hour to obtain a film-forming agent.

[0052] (2) Preparation of primer

[0053] 38 parts by mass of the film-forming agent prepared above, 2.5 parts by mass of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, 1.2 parts by mass of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and 0.04 parts by mass of dibutyltin dilaurate were added sequentially to 38 parts by mass of ethyl acetate and mixed uniformly at room temperature to obtain primer 2. The obtained primer was divided into sealed containers for later use.

[0054] Example 3:

[0055] (1) Components and preparation of film-forming agents

[0056] Table 3 Film-forming agent components and dosage

[0057] raw material Dosage (parts by mass) Methyl methacrylate 18 Methyl acrylate 3 3-Methacryloxypropyltriethoxysilane 2 Vinylboronic acid pinacol ester 11 Azobisisobutyronitrile 0.4 hydroquinone 0.04 Butyl acetate 35

[0058] All the solvents were added to a reactor equipped with a stirring, reflux, and dripping device; methyl methacrylate, methyl acrylate, vinylboronic acid pinacol ester, 3-methacryloyloxypropyltriethoxysilane, and azobisisobutyronitrile were uniformly mixed to obtain a monomer mixture, which was added to a dropping funnel and heated to 75° C.; 20% of the volume of the monomer mixture was added to the reactor and reacted for 30 minutes; the remaining monomer mixture was added dropwise for 2 hours, the temperature was kept for reaction for 1 hour, and the temperature was lowered to 55° C. for reaction for 3 hours; and hydroquinone was added and reacted for 1 hour to obtain a film-forming agent.

[0059] (2) Preparation of primer

[0060] 40 parts by mass of the film-forming agent prepared above, 1.5 parts by mass of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, 1.5 parts by mass of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and 0.06 parts by mass of dibutyltin dilaurate were added sequentially to 40 parts by mass of ethyl acetate and mixed uniformly at room temperature to obtain primer 3. The obtained primer was divided into sealed containers for later use.

[0061] Embodiment 4:

[0062] (1) Components and preparation of film-forming agents

[0063] Table 4 Film-forming agent components and dosage

[0064] raw material Dosage (parts by mass) Methyl methacrylate 19 Methyl acrylate 7 3-Methacryloxypropyltrimethoxysilane 4 Vinylboronic acid pinacol ester 8 Azobisisobutyronitrile 0.3 hydroquinone 0.03 Butyl acetate 38

[0065] All the solvents were added to a reactor equipped with a stirring, reflux, and dripping device; methyl methacrylate, methyl acrylate, vinylboronic acid pinacol ester, 3-methacryloyloxypropyltrimethoxysilane, and azobisisobutyronitrile were uniformly mixed to obtain a monomer mixture, which was added to a dropping funnel and heated to 80° C.; 20% of the volume of the monomer mixture was added to the reactor and reacted for 30 minutes; the remaining monomer mixture was added dropwise for 2 hours, the temperature was kept for reaction for 1 hour, and the temperature was lowered to 60° C. for reaction for 3 hours; and hydroquinone was added and reacted for 1 hour to obtain a film-forming agent.

[0066] (2) Preparation of primer

[0067] 50 parts by mass of the film-forming agent prepared above, 3 parts by mass of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, 1 part by mass of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and 0.1 part by mass of dibutyltin dilaurate were added sequentially to 50 parts by mass of ethyl acetate and mixed uniformly at room temperature to obtain primer 4. The obtained primer was divided into sealed containers and set aside.

[0068] Example 5:

[0069] (1) Components and preparation of film-forming agents

[0070] Table 5 Film-forming agent components and dosage

[0071] raw material Dosage (parts by mass) Methyl methacrylate 15 Methyl acrylate 6 3-Methacryloxypropyltriethoxysilane 3 Vinylboronic acid pinacol ester 9 Azobisisobutyronitrile 0.2 hydroquinone 0.02 Butyl acetate 33

[0072] All the solvents were added to a reactor equipped with a stirring, reflux, and dripping device; methyl methacrylate, methyl acrylate, vinylboronic acid pinacol ester, 3-methacryloyloxypropyltriethoxysilane, and azobisisobutyronitrile were uniformly mixed to obtain a monomer mixture, which was added to a dropping funnel and heated to 75° C.; 20% of the volume of the monomer mixture was added to the reactor and reacted for 30 minutes; the remaining monomer mixture was added dropwise for 2 hours, the temperature was kept for reaction for 1 hour, and the temperature was lowered to 65° C. for reaction for 3 hours; and hydroquinone was added and reacted for 1 hour to obtain a film-forming agent.

[0073] (2) Preparation of primer

[0074] 42 parts by mass of the film-forming agent prepared above, 2.2 parts by mass of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, 1.1 parts by mass of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and 0.04 parts by mass of dibutyltin dilaurate were added sequentially to 42 parts by mass of ethyl acetate and mixed uniformly at room temperature to obtain primer 5. The obtained primer was divided into sealed containers for later use.

[0075] Comparative Example 1:

[0076] (1) Components and preparation of film-forming agents

[0077] Table 6 Film-forming agent components and dosage

[0078] raw material Dosage (parts by mass) Methyl methacrylate 15 Methyl acrylate 6 3-Methacryloxypropyltriethoxysilane 3 Azobisisobutyronitrile 0.2 hydroquinone 0.02 Butyl acetate 33

[0079] All the solvents were added to a reactor equipped with a stirring, reflux, and dripping device; methyl methacrylate, methyl acrylate, 3-methacryloyloxypropyltriethoxysilane, and azobisisobutyronitrile were evenly mixed to obtain a monomer mixture, which was added to a dropping funnel and heated to 75° C.; 20% of the volume of the monomer mixture was added to the reactor and reacted for 30 minutes; the remaining monomer mixture was added dropwise for 2 hours, the temperature was kept for reaction for 1 hour, and the temperature was lowered to 65° C. for reaction for 3 hours; and hydroquinone was added and reacted for 1 hour to obtain a film-forming agent.

[0080] (2) Preparation of primer

[0081] 42 parts by mass of the film-forming agent prepared above, 2.2 parts by mass of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, 1.1 parts by mass of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and 0.04 parts by mass of dibutyltin dilaurate were added sequentially to 42 parts by mass of ethyl acetate and mixed uniformly at room temperature to obtain a primer comparative example 1. The obtained primer was divided into sealed containers for use.

[0082] Comparative Example 2:

[0083] (1) Components and preparation of film-forming agents

[0084] Table 7 Film-forming agent components and dosage

[0085]

[0086]

[0087] All the solvents were added to a reactor equipped with a stirring, reflux, and dripping device; methyl methacrylate, methyl acrylate, vinylboronic acid pinacol ester, and azobisisobutyronitrile were uniformly mixed to obtain a monomer mixture, which was added to a dropping funnel and heated to 80° C.; 20% of the volume of the monomer mixture was added to the reactor and reacted for 30 minutes; the remaining monomer mixture was added dropwise for 2 hours, the temperature was kept for reaction for 1 hour, and the temperature was lowered to 60° C. for reaction for 3 hours; and hydroquinone was added and reacted for 1 hour to obtain a film-forming agent.

[0088] (2) Preparation of primer

[0089] 42 parts by mass of the film-forming agent prepared above, 2 parts by mass of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, 1 part by mass of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and 0.03 parts by mass of dibutyltin dilaurate were added sequentially to 42 parts by mass of ethyl acetate and mixed uniformly at room temperature to obtain a primer comparative example 2. The obtained primer was divided into sealed containers for standby use.

[0090] Performance Testing

[0091] The primer prepared above was applied to the surfaces of glass, aluminum, and steel sheets cleaned with anhydrous ethanol. After the surface was dry, a common one-component silicone sealant was applied. A blank group (the substrate surface was not primed and the sealant was applied directly) and a control group were also prepared. After curing, the test pieces were subjected to peel tests to observe the adhesion failure between the colloid and the substrate. The adhesion percentage was determined based on the cohesive failure area. The test results are as follows:

[0092] Table 8 Test results of various embodiments and comparative examples

[0093]

[0094] The primer prepared above was applied to the surfaces of glass, aluminum, and steel sheets cleaned with anhydrous ethanol. After the surface was dry, a common one-component polyurethane adhesive was applied. A blank group (the substrate surface was not primed and the adhesive was applied directly) and a control group were also prepared. After curing, the test pieces were subjected to a peel test to observe the adhesion failure between the colloid and the substrate. The adhesion percentage was determined based on the cohesive failure area. The test results are as follows:

[0095] Table 9 Test results of various embodiments and comparative examples

[0096]

[0097] As can be seen from Tables 8 and 9, the use of the primer prepared according to the present invention significantly improved the adhesion of the one-component silicone sealant and the one-component polyurethane sealant to various substrates, essentially achieving 100% cohesive failure. This indicates that the use of vinyl borate-modified acrylic resin as a film-forming agent can greatly improve the universality of the primer.

[0098] Although the present invention has been described herein with reference to illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise numerous other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope disclosed herein, various variations and improvements may be made to the components and / or layout of the subject combination layout. In addition to variations and improvements made to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A vinyl borate modified acrylic resin film-forming agent, characterized in that: It is prepared from the following raw materials in parts by mass: (Meth)acrylate monomer: 17-30 parts; Silane coupling agent with double bond: 1~5 parts; Vinyl borate: 7-15 parts; Initiator: 0.2~0.5 parts; Inhibitor: 0.02~0.05 parts; Solvent: 30~55 parts; The vinyl borate ester is selected from vinyl boronic acid pinacol ester or 2-tert-butyl-e-vinyl boronic acid pinacol ester; The solvent is selected from one or more of ethyl acetate, butyl acetate, toluene, xylene, and dichloroethane.

2. The vinyl borate modified acrylic resin film-forming agent according to claim 1, characterized in that: The (meth)acrylate monomers are selected from two or more of methyl acrylate, ethyl acrylate, tert-butyl acrylate, cyclohexyl acrylate, isobornyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, butyl methacrylate, and isobutyl methacrylate.

3. The vinyl borate modified acrylic resin film-forming agent according to claim 1, characterized in that: The double-bond silane coupling agent is one of acryloxytrimethylsilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, vinyltrimethoxysilane and vinyltriethoxysilane.

4. The vinyl borate modified acrylic resin film-forming agent according to claim 1, characterized in that: The initiator is selected from one of benzoyl peroxide, azobisisobutyronitrile and azobisisoheptanenitrile.

5. The vinyl borate modified acrylic resin film-forming agent according to claim 1, characterized in that: The polymerization inhibitor is selected from one of hydroquinone, p-benzoquinone and p-hydroxyanisole.

6. The method for preparing the vinyl borate modified acrylic resin film-forming agent according to any one of claims 1 to 5, comprising the following steps: The solvent is added to a reaction flask equipped with a stirring device and a reflux device, and heated to 70-80°C; a (meth)acrylate monomer, a double-bond silane coupling agent, a vinyl borate, and an initiator are added together and mixed evenly to form a monomer mixture, which is dropwise added to a dropping funnel and heated to 75-85°C; 10%-40% by volume of the monomer mixture is added to the reactor, reacted for 0.5-1h, and then the remaining monomer mixture is dropwise added for 1-2h. After the dropwise addition is complete, the mixture is kept warm for reaction for 1-3h, cooled to 55-65°C, kept warm for reaction for 1-3h, and then a polymerization inhibitor is added and reacted for another 1-2h; after the reaction is completed, the mixture is cooled and discharged to obtain the vinyl borate modified acrylic resin film-forming agent.

7. A universal primer, characterized in that: Prepare according to the following mass parts: 35-50 parts of the film-forming agent according to any one of claims 1 to 5; Silane coupling agent: 2~4 parts; Catalyst: 0.02~0.1 parts; Solvent: 35~50 parts.

8. The universal primer according to claim 7, characterized in that: The silane coupling agent is selected from one or more of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropylmethyldiethoxysilane, N-β-(aminoethyl)-γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldiethoxysilane, γ-glycidylpropyltrimethoxysilane, γ-glycidylpropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane.

9. The universal primer according to claim 7, characterized in that: The catalyst is selected from one of dibutyltin dilaurate, stannous octoate, and tetrabutyl titanate; the solvent is selected from one or more of ethyl acetate, butyl acetate, toluene, xylene, and dichloroethane.

Images