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A kind of high-hardness acrylate-modified polysiloxane resin and coating based on it

A polysiloxane resin, acrylate technology, applied in anti-corrosion coatings, anti-fouling/underwater coatings, coatings, etc., can solve the problems of restricting the promotion and application of coatings, and achieve good gloss and color retention performance and anti-corrosion performance, The effect of improving crosslinking density and film densification

Active Publication Date: 2019-09-03
中昊北方涂料工业研究设计院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned acrylates are all long-chain structures, and the pencil hardness of such resins and their coatings is generally less than or equal to 3H, which cannot meet the actual requirements of pencil hardness greater than or equal to 5H for the coating film of rail vehicles such as subways and high-speed rails. , thus limiting the popularization and application of such coatings

Method used

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  • A kind of high-hardness acrylate-modified polysiloxane resin and coating based on it
  • A kind of high-hardness acrylate-modified polysiloxane resin and coating based on it
  • A kind of high-hardness acrylate-modified polysiloxane resin and coating based on it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 Preparation of High Hardness Acrylic Modified Polysiloxane Resin A

[0032] Put 208g of dicyclohexylmethane diisocyanate, 230g of hydroxypropyl methacrylate, and 0.3g of 2,6-di-tert-butylphenol into a reactor equipped with a stirrer, thermometer, reflux and dropping device, start stirring, and heat up to 80° C., keep warm for 4-5 hours, and measure the NCO% of the product by di-n-butylamine titration method. When NCO%≤0.3%, the cyclohexyl-containing acrylate (HBA-1) is obtained.

[0033] Add 123g of 1,6-hexanediol diacrylate and 510g of polysiloxane intermediate DC-3074 (Dow Corning) to the above-mentioned cyclohexyl-containing acrylate (HBA-1), and mix uniformly to obtain mixture A, which is packaged separately ,spare.

[0034] When in use, mix the above-mentioned mixture A with 152 g of curing agent N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane to obtain high-hardness acrylic modified polysiloxane resin A.

Embodiment 2

[0035] Example 2 Preparation of High Hardness Acrylic Modified Polysiloxane Resin B

[0036]Put 165g of dicyclohexylmethane diisocyanate, 165g of hydroxyethyl methacrylate, and 0.3g of p-hydroxyanisole into a reactor equipped with a stirrer, a thermometer, reflux and dropping devices, start stirring, and heat up to 80°C. After incubation and reaction for 4-5 hours, the NCO% of the product was measured by di-n-butylamine titration method. When NCO%≤0.3%, cyclohexyl-containing acrylate (HBA-2) was obtained.

[0037] Add 70 g of neopentyl glycol diacrylate and 575 g of polysiloxane intermediate DC-3037 (Dow Corning) to the above-mentioned cyclohexyl-containing acrylate (HBA-2), and mix uniformly to obtain Mixture A, which is packaged separately and set aside.

[0038] When in use, mix the above-mentioned mixture A with 164 g of curing agent N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane to obtain high-hardness acrylic modified polysiloxane resin B.

Embodiment 3

[0039] Example 3 Preparation of High Hardness Acrylic Modified Polysiloxane Resin C

[0040] Put 180g of dicyclohexylmethane diisocyanate, 122g of hydroxyethyl methacrylate, 61g of hydroxypropyl acrylate, 0.3g of 2,6-di-tert-butylphenol into the reactor equipped with stirrer, thermometer, reflux and dropping device. g, start stirring, heat up to 80°C, and after 4-5 hours of insulation reaction, use the di-n-butylamine titration method to measure the NCO% of the product. When NCO%≤0.3%, the cyclohexyl-containing acrylate (HBA-3 ).

[0041] Add neopentyl glycol diacrylate 36g, 1,6-hexanediol diacrylate 36g, polysiloxane intermediate SY231 (Wack) 835g to the above-mentioned cyclohexyl-containing acrylate (HBA-3), mix Mixture A is obtained after homogenization, which is packaged separately and set aside.

[0042] When in use, mix the above-mentioned mixture A with 145 g of the curing agent γ-aminopropyltriethoxysilane to obtain the high-hardness acrylic modified polysiloxane res...

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Abstract

The invention discloses high-hardness acrylate-modified polysiloxane resin and a coating employing the high-hardness acrylate-modified polysiloxane resin as a base material. The resin is mainly prepared by compounding 41-65wt% of active polysiloxane intermediate, 15-36wt% of cyclohexyl-containing acrylic ester, 5-15wt% of polyfunctional acrylate monomer and 10-20wt% of amino-hydrocarbon alkoxy silane. The harness of a pencil solidified by a two-component coating prepared from the acrylate-modified polysiloxane resin as the base material is greater than or equal to 5H, and meanwhile, the acrylate-modified polysiloxane resin can meet high solid content, low viscosity, room-temperature fast curing performance, overlong weather resistance and anticorrosion performance, and can be widely applied to surface coating of rail vehicles of subways and high-speed rails.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a high-hardness acrylate-modified polysiloxane resin and a coating using the same as a base material. Background technique [0002] Polysiloxane coatings have been widely used as long-term anti-corrosion system topcoats. This type of coating has excellent gloss and color retention and anti-corrosion properties, and has the characteristics of high solid content and low viscosity. The VOC content is extremely low. Meet the requirements of environmental regulations. Polysiloxane coating products are mainly used for the surface of rail vehicles such as subways and high-speed rails, public buildings such as bridges, stadiums and TV towers, petrochemical equipment and wind power towers, etc., for decoration and protection. Superior to aliphatic urethane acrylate coatings. [0003] Polysiloxane resin is relatively brittle, and organic resins are often used for modification in practical applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D4/02C09D4/06C09D5/08C09D5/16C09D7/63
Inventor 胥卫奇王国志刘文兴沙伟华孙哲孟军锋
Owner 中昊北方涂料工业研究设计院有限公司
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