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High-solid automobile finish varnish and preparation method thereof

A high-solid varnish technology, applied in coatings and other directions, can solve problems such as poor leveling, lower gloss, and increased costs, and achieve good weather resistance, increase construction solids, and reduce VOC emissions.

Active Publication Date: 2017-06-13
中山大桥化工集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to increasing the cost, the acquisition of thixotropy will also cause some unpredictable negative effects, such as reduced gloss, poor leveling, increased haze, etc.

Method used

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  • High-solid automobile finish varnish and preparation method thereof
  • High-solid automobile finish varnish and preparation method thereof
  • High-solid automobile finish varnish and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] Preparation of polyester resin A containing special functional groups: 416 parts of neopentyl glycol, 582 parts of dimethyl malonate and 2 parts of DBTO mixture were placed in a four-necked flask equipped with a stirrer and a condenser, Stir and heat up to 105°C under a nitrogen atmosphere, and continue to heat up to 190°C. Then 20 parts of hexane was added, and the methanol produced was removed by azeotropic distillation. Cool down to 160 DEG C and add 165 parts of xylenes subsequently, obtain polyester resin A containing special functional group, this resin non-volatile matter is 80.0%, acid value 0.3, hydroxyl content 1.88% (accounting for resin weight), number-average molecular weight 2450, activity The hydrogen equivalent is 245 (calculated according to the resin design structure, the same below).

[0027] Preparation of polyester resin B containing special functional groups: 216 parts of dimethylolcyclohexane, 158 parts of 1,6-hexanediol, 320 parts of dimethyl ma...

Embodiment

[0032] The weight percentages of the resins prepared in Examples 1-4 and Comparative Examples 1-2 are shown in Table 1, and they were formulated into varnishes with a solid content of 55-60% in the original paint.

[0033] The preparation process of the varnish is as follows: after cleaning the equipment with trimethylbenzene to confirm the cleanliness before feeding, put component a, component b, component c and component d into the main tank in sequence, and stir at 1000±100rpm for 1 hour until all components are mixed evenly , then add the catalyst, additives and solvent trimethylbenzene sequentially under the stirring state, stir at 500±50rpm for 30min, QC detects that the fineness of the varnish is <5μm, and sprays the plate (tinplate plate, 20×20cm) to check whether the varnish has shrinkage cavities, such as fine If the degree and shrinkage condition are qualified, it will be packaged and discharged.

[0034] Then, a single-layer varnish film with a thickness of 23±2μm ...

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Abstract

The present invention provides a high-solid automotive finish varnish composition, which contains a polymer with the following special structure: a) a thermosetting hydroxyl acrylic resin; One or more polymers of ester and acetylacetone groups; c) polymers containing unsaturated acrylate groups; d) crosslinking agent. In the varnish composition of the present invention, the two types of polymers of components b) and c) appear in pairs, and their function is to cross-link to form a Michael addition reaction during the baking of the car body after the varnish is sprayed. membrane. The finish varnish composition of the present invention has the characteristics of high solid content in construction, low VOC emission, easy film thickness, good anti-sagging; high hardness of the paint film, scratch resistance, full and bright appearance, good aging resistance and medium corrosion resistance, etc. It is especially suitable for automobile body coating, and can also be used in outdoor protective coating occasions such as motorcycles, construction machinery, railway locomotives and light industrial products.

Description

technical field [0001] The invention relates to a finishing varnish and a preparation method thereof, in particular to a high-solid automobile finishing varnish and a preparation method thereof. Background technique [0002] Automobiles are one of the products with the highest requirements for decorative protection of coatings among industrial OEM products. As the outermost layer of automotive coatings, varnish must not only meet the basic protective performance, but also meet the characteristics of good construction and high decoration , so the appearance of the varnish (leveling, sharpness and fullness, etc.), weather resistance, hardness, flexibility, sag resistance, stone chip resistance, crack resistance, scratch resistance, environmental corrosion resistance (biological Corrosion and acid rain erosion, etc.) and easy repairs have extremely high requirements. [0003] Due to the restriction of VOC emission regulations, how to reduce the content of volatile organic comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D4/02C09D4/06C09D7/12
Inventor 胡志标孟东阳刘安心周全肖迪张璇王伟徐德生黃谊操斌谭军
Owner 中山大桥化工集团有限公司
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