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Ultraviolet light-heat dual-curing primer for vacuum coating of vehicle headlight and application method

A dual-curing and vacuum coating technology, applied in coating, surface pretreatment, and devices for coating liquid on the surface, etc., can solve the problems of large internal stress, poor adhesion, unsatisfactory heat resistance, etc. The effect of bonding density, improving adhesion and reducing internal stress

Active Publication Date: 2015-01-28
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The primer used for vacuum coating in the early days is mainly two-component heat-baking paint, but the optical mirror effect of the car lamp after coating is not good, and the heat resistance is not ideal
At present, many manufacturers have begun to use UV-curable coatings. Because of their low viscosity and fast curing, the surface after coating is smooth and the mirror effect of the coating is good. However, the coating formed by UV-curable coatings has large internal stress, The disadvantage of poor adhesion makes it difficult to balance the adhesion and heat resistance of the coating film at the same time

Method used

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  • Ultraviolet light-heat dual-curing primer for vacuum coating of vehicle headlight and application method
  • Ultraviolet light-heat dual-curing primer for vacuum coating of vehicle headlight and application method
  • Ultraviolet light-heat dual-curing primer for vacuum coating of vehicle headlight and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Preparation of isocyanate-modified modified acrylic resin containing carbon-carbon double bond and hydroxyl group

[0027] Specific steps are as follows:

[0028] ① Synthesis of single-capped adducts

[0029] Add 55.5g of isophorone diisocyanate, 30g of dehydrated toluene, 0.1g of polymerization inhibitor p-hydroxyanisole, and 0.05g of catalyst dibutyltin dilaurate into the reaction flask, raise the temperature to 50°C, and start dropping 39g of hydroxypropyl acrylate The mixture of ester and 64.5g dehydrated toluene was added dropwise in 1 hour, kept at 50°C for 2 hours, raised to 60°C for 1 hour, continued to heat up to 70°C for 1 hour, added 0.05g of catalyst dibutyltin dilaurate and raised to 80°C After keeping warm for 1 hour, cool down to below 50°C, and the product is a single-capped adduct, which is stored for future use;

[0030] The reaction formula involved in the above synthesis is as follows:

[0031]

[0032] ② Synthesis of isocyanate-modif...

Embodiment 2

[0037] Example 2 Preparation of UV-heat dual curing primers 1-8

[0038] The ultraviolet-heat dual curing primer of the present invention is composed of component A and component B, and the component A is composed of 35 to 70 parts by weight of isocyanate-modified acrylic resin containing carbon-carbon double bonds and hydroxyl groups, and containing carbon-carbon double bonds 5-20 parts by weight of oligomers, 10-50 parts by weight of compounds containing at least 2 (meth)acryloyl groups, 2-5 parts by weight of photoinitiators, 10-40 parts by weight of solvents, organic silicon or fluorocarbon The leveling agent is composed of 0.1 to 3 parts by weight, and the sum of the above components is 100 parts by weight;

[0039] ① See Table 1 for the specific formulations of primers 1-8.

[0040] Table 1

[0041]

[0042]

[0043] Note 1: The total of each component A of primers 1 to 8 is 100 parts by weight; The molar ratio of -NCO groups contained in the polyfunctional isoc...

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Abstract

The invention relates to an ultraviolet light-heat dual-curing primer for vacuum coating of a vehicle headlight and an application method. The primer comprises a component A and a component B, wherein the component A is prepared from 35-70 parts of isocyanate modified acrylic resin containing carbon-carbon double bonds and hydroxyl, 5-20 parts of a low polymer containing carbon-carbon double bonds, 10-50 parts of a compound containing at least two (meth)acryloyl groups, 2-5 parts of a photo-initiator, 10-40 parts of a solvent, and 0.1-3 parts of organic silicon or fluorocarbon flatting agent, and the sum of the components is 100 parts by weight; the component B is a polyfunctional isocyanate curing agent; and before construction, the components A and B are mixed evenly according to the molar ratio of -OH groups contained in the component A to -NCO groups contained in the component B being (0.8-1.3) to 1. Due to adoption of the primer and the application method thereof disclosed by the invention, a primer film has good adhesive force and heat resistance on a plastic substrate which is difficult to attach.

Description

technical field [0001] The invention relates to an ultraviolet light-heat dual curing primer for vacuum coating of car lamps and a use method thereof. Background technique [0002] With the development of the automobile industry, the application of lightweight decorative materials is becoming more and more extensive, and automotive lighting components are one of the main parts. Automobile lights are mainly made of unsaturated polyester thermosetting plastics into molded products of various shapes, and then a layer of primer is coated on the surface of the plastic, and then vacuum coating is carried out by vapor deposition to form an optical mirror surface, resulting in a good Reflective effect. The primer used for vacuum coating in the early days was mainly two-component heat-baking paint, but the optical mirror effect of the car lamp after coating was not good, and the heat resistance was not ideal. At present, many manufacturers have begun to use UV-curable coatings. Bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14B05D1/38B05D3/02B05D3/06
CPCB05D3/0254B05D3/067B05D7/24C08L2201/08C09D175/14C08L33/00
Inventor 苟小青王木立顾斌张玉兴马智俊
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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