Wear resistance and anti-ultraviolet coating for polycarbonate and preparation thereof

A polycarbonate, UV-resistant technology, applied in the coating and other directions, can solve the problems of poor storage stability, poor storage stability, easy yellowing, etc., and achieve the effect of good transparency

Active Publication Date: 2017-05-17
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

[0003] Most of this transparent wear-resistant coating is silicon-containing coating at present, has adopted colloidal silicon dioxide and methyltriethoxysilane as raw material to prepare transparent hardening coating as U.S. Patent US3986997A, and this coating is on the surface of polycarbonate Poor adhesion, poor storage stability
US5503935A, US5349002A have adopted alkaline silica sol and methyltriethoxysilane cohydrolysis at room temperature and introduced polyhydroxy polyester and polyacrylic acid, and the storage stability of this product is poor
In US4291098A, epoxy resin is used as an adhesion promoter to prepare a primer-free wear-resistant coating, but the introduction of a strong solvent makes polycarbonate plastics prone to silver streaks
Chinese patent CN 101967350 B uses acidic silica sol and methyltriethoxysilane to hydrolyze, and introduces polymer polyols, curing agents, etc. to prepare a wear-resistant coating with good wear resistance, hardness, etc., but the UV resistance of this product Aging performance needs further improvement
[0004] The current transparent wear-resistant coatings have poor UV aging resistance and are prone to yellowing when used outdoors for a long time. Although CN201310694981. , after 240h, the adhesion of the coating can reach level 0, but the yellowing of the coating is more serious

Method used

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  • Wear resistance and anti-ultraviolet coating for polycarbonate and preparation thereof
  • Wear resistance and anti-ultraviolet coating for polycarbonate and preparation thereof
  • Wear resistance and anti-ultraviolet coating for polycarbonate and preparation thereof

Examples

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Effect test

preparation example 1

[0023] Preparation of adhesion promoter: Add 50g of polyether diol with a molecular weight of 200 and 148g of 3-isocyanatopropyltrimethoxysilane into the reactor, add 2 drops of 10% organotin catalyst, and let the system continue to stir at room temperature for 12 When the measured NCO content in the system reached or approached the theoretical value, the reaction was stopped, and the adhesion promoter number A-1 was obtained.

preparation example 2

[0025] Preparation of adhesion promoter: Add 45g of polyether diol with a molecular weight of 400 and 56g of 3-isocyanatopropyltriethoxysilane into the reactor, add 2 drops of 10% organotin catalyst, and let the system continue to stir at room temperature After 12 hours, when the NCO content in the system was measured to reach or approach the theoretical value, the reaction was stopped, and the adhesion promoter number A-2 was obtained.

preparation example 3

[0027] Preparation of adhesion promoter: add 45g polyether triol and 65g 3-isocyanatopropyltrimethoxysilane in the reactor, add 2 drops of 10% organotin catalyst, let the system continuously stir at room temperature for 12 When the measured NCO content in the system reached or approached the theoretical value, the reaction was stopped, and the adhesion promoter number A-3 was obtained.

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Abstract

The invention discloses a wear resistance and anti-ultraviolet coating for polycarbonate, and the coating is prepared through the following method: adding alkaline silica sol, distilled water, ultraviolet light absorber and acetic acid into a reactor; heating, and starting to dropwise add alkoxy silane with at least two degrees of functionality when a system temperature reaches 60 DEG C, wherein the dropwise adding takes 1 to 3 hours and the reaction system temperature in a dropwise adding process is controlled to be 60 to 72 DEG C; adding an adhesion promoter for heating and refluxing for 0.5 to 2 hours after dropwise adding, and adding a silane coupling agent and a solvent after cooling to below 40 DEG C. The coating layer obtained from the coating has performances of good transparency, wear resistance, water resistance, anti-ultraviolet ageing and the like.

Description

technical field [0001] The invention relates to a wear-resistant and UV-resistant coating for polycarbonate and a preparation method thereof. Background technique [0002] With the wide application of polymer transparent materials, especially the wide application of polycarbonate plastics, there are new needs and requirements for wear-resistant coatings used with them, especially for the wear resistance of coatings and after coating wear-resistant coatings. The aging resistance of polycarbonate plastics puts forward higher requirements. [0003] Most of this transparent wear-resistant coating is silicon-containing coating at present, has adopted colloidal silicon dioxide and methyltriethoxysilane as raw material to prepare transparent hardening coating as U.S. Patent US3986997A, and this coating is on the surface of polycarbonate Poor adhesion, poor storage stability. In US5503935A and US5349002A, alkaline silica sol and methyltriethoxysilane are co-hydrolyzed at room temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D7/12C08G77/04C08G77/06C08J7/04C08L69/00
CPCC08G77/04C08G77/06C08J7/0427C08J2369/00C08J2483/04C08L2201/08C08L2201/10C09D7/61C09D7/63C09D7/65C09D183/04C08L75/04C08K3/36C08K2003/2241C08K5/5435C08K5/5425
Inventor 王志强魏超杨茂林施颖波杨康周敏杨阳
Owner 中昊北方涂料工业研究设计院有限公司
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