1. The polyurethane glass primer is characterized by comprising the following components in parts by weight:

10-30 parts of silane modified polyurethane prepolymer, 1-5 parts of adhesion promoter, 1-2 parts of dispersant, 1-5 parts of carbon black, 60-85 parts of solvent and 0.01-0.2 part of catalyst;

the silane modified polyurethane prepolymer is obtained by polymerizing 2-10 parts of polyol and 4-22 parts of polyisocyanate and then carrying out end capping on the polymerized product by using a silane coupling agent;

the adhesion promoter isγ-glycidyloxypropyltrimethoxysilane,γ-glycidyloxypropyltriethoxysilane,β- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane orβOne of (3, 4-epoxycyclohexyl) ethyltriethoxysilane;

the dispersant is one of Dispers 673 of Digao company, BYK-161 of Biker chemical company and GR-5100H of Shenzhen Henghe company.

2. The polyurethane glass primer according to claim 1, wherein the polyol is one of DL-400, DL-1000, dipropylene glycol, diethylene glycol, 1, 3-butanediol, methyl propanediol, 1, 5-pentanediol, neopentyl glycol, or hydroxypivalyl hydroxypivalate.

3. The polyurethane glass primer according to claim 1, wherein the polyisocyanate is selected from one or more of hexamethylene diisocyanate, hexamethylene diisocyanate group polyisocyanate, toluene diisocyanate, polymethylene polyphenyl isocyanate, 4' -diphenylmethane diisocyanate or isophorone diisocyanate.

4. The polyurethane glass primer according to claim 1, wherein the silane coupling agent is selected from the group consisting of 3-aminopropyltrimethoxysilane,γ-aminopropyltriethoxysilane,γMercaptopropyltrimethoxysilane, anilinomethyltrimethoxysilane orγ-one of aminoethylaminopropyltrimethoxysilane.

5. The polyurethane glass primer coating according to claim 1, wherein the carbon black is selected from one of the products of European Union U carbon, European Union 49L, European Union XPB-756, Shenzhen Heizhe GR-M26315L.

6. The polyurethane glass primer according to claim 1, wherein the solvent is one or more selected from ethyl acetate, butyl acetate, acetone, butanone, isobutyl ketone, cyclohexanone, toluene and xylene.

7. The polyurethane glass primer coating according to claim 1, wherein the catalyst is one or more selected from bismuth isooctanoate, stannous octoate, dibutyltin dilaurate, dimethyltin dioctanoate, triethylamine, triethylenediamine and bis (2, 2-morpholinoethyl) ether.

8. A method for preparing the polyurethane glass primer according to any one of claims 1 to 7, which is characterized by comprising the following steps:

(1) mixing 2-10 parts of polyol and 4-22 parts of polyisocyanate, reacting for 10-60 minutes at 40-60 ℃, adding 0.01-0.2 part of catalyst, continuing to react for 6-12 hours at 60-110 ℃, adding 1-5 parts of silane coupling agent when testing NCO content to be 6% -8%, reacting for 2-5 hours at 60-110 ℃, and obtaining silane modified polyurethane prepolymer when testing NCO content to be 4.5% -5.5%;

(2) adding 10-30 parts of silane modified polyurethane prepolymer, 1-5 parts of adhesion promoter, 1-2 parts of dispersant, 1-5 parts of carbon black, 60-85 parts of solvent and 0.01-0.2 part of catalyst into a grinding machine, and grinding at the rotating speed of 1200-1800 rpm for 3-10 hours to obtain the primer.

Background

The edge covering forming process for automobile glass includes precisely measuring the components in certain proportion, high pressure collision mixing in a mixing head, filling the mixture into a mold with glass, and reaction and curing the mixture in the mold cavity to coat the mixture on the edge surface of glass. The primer is coated on the surface of the glass, so that the bonding strength of the polyurethane material and the glass can be improved.

Patent document CN102516921A discloses a preparation method of silane modified polyurethane glass primer, and the prepared primer has longer open time; patent document CN103113819A discloses a primer for polyurethane sealant, which has short surface drying and curing time; patent CN106752838B discloses a polyurethane sealant primer with excellent humidity and heat aging resistance. The primer is used for bonding the polyurethane material and the skylight glass, the bonding effect is unsatisfactory, and the solid contents of the primer and the skylight glass are higher and higher than 30 percent, so that the cost is higher.

The primer prepared by the prior art has not the best bonding effect. After the primer and the polyurethane sealant or the edge covering material are sequentially constructed, in order to measure the peeling strength after the primer is used, the polyurethane sealant or the edge covering material needs to be peeled off from the glass, a 90-degree peeling test is carried out, and the maximum tensile value is recorded, which is a common test method for the product spot check of automobile manufacturers. If the polyurethane sealant or the edge covering material cannot be completely stripped from the glass, the peel strength is larger than the strength of the sealant or the edge covering material, and the true peel strength cannot be measured, namely the best bonding effect is obtained.

Disclosure of Invention

Based on the problems in the prior art, the first object of the invention is to provide a polyurethane glass primer, which can ensure that a polyurethane edge-covering material and skylight glass have higher bonding strength and large peeling strength when used together with a polyurethane glass sealant or edge-covering material, and can obviously reduce the cost due to lower solid content.

The second purpose of the invention is to provide a method for preparing the polyurethane glass primer.

In order to achieve the first purpose, the invention provides a polyurethane glass primer which comprises the following components in parts by weight:

10-30 parts of silane modified polyurethane prepolymer, 1-5 parts of adhesion promoter, 1-2 parts of dispersant, 1-5 parts of carbon black, 60-85 parts of solvent and 0.01-0.2 part of catalyst.

The silane modified polyurethane prepolymer is obtained by polymerizing 2-10 parts of polyol and 4-22 parts of polyisocyanate and then carrying out end capping on the polymerized product by using a silane coupling agent.

The polyalcohol is preferably one of DL-400 from Doctoria crassipes, DL-1000 from Doctoria crassipes, dipropylene glycol, diethylene glycol, 1, 3-butanediol, methyl propanediol, 1, 5-pentanediol, neopentyl glycol or hydroxypivalyl hydroxypivalate, etc.

The polyisocyanate is preferably one or more of hexamethylene diisocyanate, hexamethylene diisocyanate group polyisocyanate, toluene diisocyanate, polymethylene polyphenyl isocyanate, 4' -diphenylmethane diisocyanate or isophorone diisocyanate.

The silane coupling agent is preferably 3-aminopropyltrimethoxysilane,γ-aminopropyltriethoxysilane,γMercaptopropyltrimethoxysilane, anilinomethyltrimethoxysilane orγ-aminoethylaminopropyltrimethoxysilane and the like.

The adhesion promoter is preferablyγ-glycidyloxypropyltrimethoxysilane,γ-glycidyloxypropyltriethoxysilane,β- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane orβ- (3, 4-epoxycyclohexyl) ethyltriethoxysilane, etc.

The dispersant is preferably one of products such as Dispers 673 of Digao corporation, BYK-161 of Biker chemical corporation, GR-5100H of Shenzhen Henshe corporation and the like.

The carbon black is preferably one of products of European Union U carbon, European Union 49L, European Union XPB-756, Shenzhen Henshe GR-M26315L, and the like.

The solvent is preferably one or more of ethyl acetate, butyl acetate, acetone, butanone, isobutyl ketone, cyclohexanone, toluene or xylene.

The catalyst is preferably one or more of bismuth isooctanoate, stannous octoate, dibutyltin dilaurate, dimethyltin dioctanoate, triethylamine, triethylenediamine or bis (2, 2-morpholinoethyl) ether.

To achieve the second object, the present invention provides a method for preparing a polyurethane glass primer, comprising the steps of:

(1) mixing 2-10 parts of polyol and 4-22 parts of polyisocyanate, reacting for 10-60 minutes at the temperature of 40-60 ℃, adding 0.01-0.2 part of catalyst, continuing to react for 6-12 hours at the temperature of 60-110 ℃, adding 1-5 parts of silane coupling agent when testing the NCO content to be 6% -8%, reacting for 2-5 hours at the temperature of 60-110 ℃, and obtaining the silane modified polyurethane prepolymer when testing the NCO content to be 4.5% -5.5%.

(2) Adding 10-30 parts of silane modified polyurethane prepolymer, 1-5 parts of adhesion promoter, 1-2 parts of dispersant, 1-5 parts of carbon black, 60-85 parts of solvent and 0.01-0.2 part of catalyst into a grinding machine, and grinding at the rotating speed of 1200-1800 rpm for 3-10 hours to obtain the primer.

According to the invention, the silane coupling agent is used for modifying the polyurethane prepolymer, and the adhesion promoter is added, so that when the primer is matched with the polyurethane sealant or the edge covering material for use, the polyurethane material and the skylight glass can be ensured to have higher adhesion strength, the performances such as peel strength and the like of the primer are superior to those of similar products in the prior art, and the safety of an automobile glass product assembly can be obviously improved. In addition, the solid content of the primer is low, and the production cost can be obviously reduced on the premise of ensuring that the bonding strength is not reduced.

The polyurethane glass primer prepared by the invention can be used for automobile skylight assembly products, and can also be used for bonding front and rear windshields, rear triangular glass and the like.

Detailed Description

For the purpose of understanding, the present invention will be further described with reference to the following specific examples. The embodiment provides a primer for polyurethane glass wrapping and a preparation method thereof.

Example 1

(1) Preparing a silane modified polyurethane prepolymer:

fully mixing 5 parts of DL-400, 6 parts of hexamethylene diisocyanate, 1 part of hexamethylene diisocyanate-based polyisocyanate, 0.5 part of toluene diisocyanate and 3 parts of polymethylene polyphenyl isocyanate, reacting for 60 minutes at the temperature of 40 ℃, adding 0.05 part of bismuth isooctanoate, continuously reacting for 9 hours at the temperature of 85 ℃, testing the NCO content to be 6-8%, adding 3 parts of 3-aminopropyltrimethoxysilane, reacting for 3 hours at the temperature of 85 ℃, testing the NCO content to be 4.5-5.5%, and thus obtaining the silane-modified polyurethane prepolymer.

(2) Preparing a primer:

20 parts of silane modified polyurethane prepolymer and 3 parts of silane modified polyurethane prepolymerγGlycidyl ether oxypropyltrimethoxysilane, 1.5 parts of Dispers 673, 3 parts of U carbon, 30 parts of ethyl acetate, 40 parts of acetone and 0.05 part of stannous octoate are added into a grinding machine and ground for 5 hours at the rotating speed of 1500 revolutions per minute to obtain the primer.

Example 2

(1) Preparing a silane modified polyurethane prepolymer:

fully mixing 2 parts of DL-1000, 3 parts of hexamethylene diisocyanate, 0.1 part of hexamethylene diisocyanate group polyisocyanate, 0.1 part of toluene diisocyanate and 1 part of polymethylene polyphenyl isocyanate, reacting for 30 minutes at the temperature of 50 ℃, adding 0.01 part of dibutyltin dilaurate, continuously reacting for 12 hours at the temperature of 60 ℃, testing the NCO content to be 6-8%, and adding 1 part of dibutyltin dilaurateγAnd (3) reacting aminopropyltriethoxysilane for 5 hours at the temperature of 60 ℃, wherein the NCO content is 4.5-5.5% by testing, and thus obtaining the silane modified polyurethane prepolymer.

(2) Preparing a primer:

10 parts of silane modified polyurethane prepolymer and 1 part of silane modified polyurethane prepolymerγGlycidyl ether oxypropyltriethoxysilane, 1 part of BYK-161, 1 part of 49L, 25 parts of butyl acetate, 35 parts of butanone, and 0.01 part of dioctyl decanoic acidAnd adding the methyltin into a grinding machine, and grinding for 10 hours at the rotating speed of 1200 r/min to obtain the primer.

Example 3

(1) Preparing a silane modified polyurethane prepolymer:

fully mixing 10 parts of dipropylene glycol, 12 parts of hexamethylene diisocyanate, 3 parts of hexamethylene diisocyanate group polyisocyanate, 1.5 parts of toluene diisocyanate and 5 parts of polymethylene polyphenyl isocyanate, reacting at the temperature of 60 ℃ for 10 minutes, adding 0.2 part of triethylamine, continuously reacting at the temperature of 110 ℃ for 6 hours, testing the NCO content to be 6-8%, and adding 5 parts ofγAnd (3) reacting the-mercaptopropyl trimethoxy silane at the temperature of 110 ℃ for 2 hours, wherein the NCO content is 4.5-5.5% by testing, and thus obtaining the silane modified polyurethane prepolymer.

(2) Preparing a primer:

20 parts of silane modified polyurethane prepolymer and 3 parts of silane modified polyurethane prepolymerβ- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, 1.4 parts of GR-5100H, 3 parts of XPB-756, 30 parts of ethyl acetate, 45 parts of isobutyl ketone and 0.05 part of triethylenediamine are added into a grinding machine and ground for 3 hours at the rotating speed of 1800 revolutions per minute to obtain the primer.

Comparative example 1

(1) 15 portions of polyester polyol is dehydrated for 2 hours at the temperature of 110 ℃ and the pressure of less than-0.092 MPa, cooled to 65 ℃, added with 3 portions of toluene diisocyanate, reacted for 2 hours at the temperature of 85 ℃, cooled to 50 ℃, and then added with 2 portions of toluene diisocyanateγReacting for 1 hour, and cooling to 25 ℃ to obtain the silane-terminated polyurethane polymer.

(2) And (2) dehydrating 15 parts of acrylate polyol at the temperature of 110 ℃ and under the pressure of less than-0.092 MPa for 1.5 hours, cooling to 65 ℃, adding 4 parts of xylylene diisocyanate, reacting at the temperature of 80-85 ℃ for 2-3 hours, and cooling to 20-30 ℃ to obtain the modified polyurethane.

(3) Adding 25 parts of silane-terminated polyurethane polymer obtained in the step (1) and 25 parts of modified polyurethane obtained in the step (2) into a ball mill, adding 25 parts of ethyl acetate and 25 parts of acetone, 1.5 parts of water-removing agent vinyl trimethoxy silane, 1.5 parts of anti-settling agent fumed silica and 4 parts of adhesion promoter TDI trimer, adding 5 parts of carbon black, 0.05 part of triethylene diamine and 0.05 part of dibutyltin dilaurate after ball milling for 1.5 hours, and carrying out ball milling for 4 hours to obtain the polyurethane sealant primer.

Physical indexes of examples 1, 2 and 3 and comparative example 1 and performance indexes of the constructed skylight assembly product are shown in table 1.

TABLE 1 physical and Performance indices of the primers