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A high-solid fast-drying scratch-resistant varnish composition, preparation method and application

A fast-drying, scratch-resistant technology that can be used in coatings to solve problems such as unavailability, unsatisfactory varnish drying speed, and lack of automotive refinish paint.

Active Publication Date: 2019-07-02
NIPPON PAINT CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In order to protect the environment, the development direction of automotive refinish paint is water-based paint and high-solid varnish. However, the traditional high-solid varnish needs to meet high construction solid content, the molecular weight of the resin is small, and the glass transition temperature is low. The (Tg) point is low, resulting in a slow initial drying speed of the varnish. It cannot be polished and assembled according to normal baking conditions or natural drying time, which reduces the production efficiency of car repair.
[0003] It is difficult to balance the drying speed and construction solid content of traditional automotive refinish varnishes. Using high molecular weight and high Tg resins can increase the drying speed, but often cannot achieve high construction solid content, and the drying speed of varnishes with high construction solid content cannot make people satisfy
By changing the main resin type of the paint from acrylic to a special functional resin, a fast drying speed and a good balance of construction solids can be achieved, but it will also bring new problems: a) too short usable time, usually In a sense, the varnish of automotive refinish paint needs at least 1 hour of usable time after it is prepared. After the usable time is exceeded, the paint will gel and cannot continue to be used. However, the usable time of this resin is only 10- 20 minutes, unable to adapt to the actual requirements of production; b) difficult to polish, in order to play a decorative and protective role, automotive repair varnishes need a certain cross-linking density, hardness and flexibility, high cross-linking density and flexibility are conducive to obtaining good Chemical resistance, scratch resistance and stone chip resistance, but the high crosslinking density and flexibility of this special functional resin will make it difficult to polish the varnish after construction and reduce production efficiency; the above shortcomings make this special function The resin cannot be used as the main resin of the paint, and meets the requirements of the refinish paint clear coat
To sum up, automotive refinish paint lacks a high-solid varnish with fast drying and good scratch resistance, especially a varnish with VOC<420g / L

Method used

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  • A high-solid fast-drying scratch-resistant varnish composition, preparation method and application
  • A high-solid fast-drying scratch-resistant varnish composition, preparation method and application
  • A high-solid fast-drying scratch-resistant varnish composition, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Add 7.18 parts of butyl acetate, 6 parts of methyl amyl ketone, 3 parts of methyl isobutyl ketone, and 3 parts of butyl 3-methoxypropionate into a container with a stirrer, and add the solid content in turn. 75% Seta 1603 BA-78 polyester resin 15 parts, dibutyltin dilaurate 0.02 parts, dimethylethanolamine 0.2 parts, 75% curing amount of Dianal LR-7928 acrylic resin 65 parts, Tinuvin 1130 UV absorption 1.0 part of Tinuvin 292 hindered amine light stabilizer, 0.2 part of BYK 306 silicone leveling agent, 0.4 part of BYK 358N acrylate leveling agent, 0.2 part of BYK 410 anti-sagging aid, stir evenly to obtain a varnish;

[0063] Under the protection of nitrogen, add 5 parts of butyl acetate, 10 parts of ethyl acetate, and 5 parts of methyl amyl ketone, stir evenly, use a moisture tester to test the moisture content, control the moisture content to ≤0.03%, and then stir under Add 55 parts of DESMOPHEN 3300 isocyanate and 25 parts of DESMODUR Z4470 BA isocyanate; stir evenly to...

Embodiment 2

[0066] Add 3.43 parts of butyl acetate, 6 parts of methyl amyl ketone, 3 parts of methyl isobutyl ketone, and 3 parts of butyl 3-methoxypropionate into a container with a stirrer, and add the solid content in turn. 54% BBHA D5025 (Cyglaz BB500) polyester resin 10 parts, dibutyl tin dilaurate 0.02 parts, 75% solid content Macrynal SM 2810 75 BAC acrylic resin 72 parts, Tinuvin 400 UV absorber 1.0 part, Tinuvin 292 0.5 part of hindered amine light stabilizer, 0.1 part of BYK 306 silicone leveling agent, 0.25 part of BYK 358N acrylate leveling agent, 0.2 part of solthix 250 rheological additive, and 0.05 part of BYK 331 silicone leveling agent. Stir uniformly to obtain Varnish

[0067] Under the protection of nitrogen, add 10 parts of butyl acetate, 25 parts of ethyl acetate, and 5 parts of methyl amyl ketone, stir evenly, use a moisture tester to test the moisture content, control the moisture content to ≤0.03%, and then stir under Add 60 parts of DESMOPHEN 3600 isocyanate; stir e...

Embodiment 3

[0070] Add 4.76 parts of butyl acetate, 6 parts of methyl amyl ketone, 5 parts of methyl isobutyl ketone, and 2 parts of butyl 3-methoxypropionate in a container with a stirrer, and add the solid content in turn. 8 parts of 62% BB 600 polyester resin, 0.02 parts of dibutyltin dilaurate, 72 parts of Uracron CY 250 E-75 acrylic resin with 75% solid content, 1.0 part of Tinuvin 1130 UV absorber, Tinuvin 292 hindered amine light 0.5 part of stabilizer, 0.3 part of BYK 358N acrylate leveling agent, 0.1 part of EFKA3600 fluoro-modified acrylate leveling agent, 0.04 part of Modaflow 2100 leveling agent, and 0.3 part of Solthix 250 rheological additive, and mix well to obtain a varnish;

[0071] Under the protection of nitrogen, add 5 parts of butyl acetate, 20 parts of ethyl acetate, 4.7 parts of S-100 mineral spirits or mesitylene mineral spirits, 5 parts of methyl amyl ketone and 0.3 parts of ADDITIVE TI monofunctional isocyanate, and stir well. , Use a moisture tester to test the moi...

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Abstract

The invention discloses quick-drying scratch-resistant varnish composition with high solid content. The quick-drying scratch-resistant varnish composition comprises varnish and a curing agent in a volume ratio being 2:1, wherein the varnish comprises components in parts by weight as follows: 60-80 parts of acrylic resin, 3-20 parts of polyester resin, 0.4-1 part of a leveling agent, 0.02-0.5 parts of a catalyst, 1-2 parts of an ageing-resistant auxiliary and 10-20 parts of a first solvent; the curing agent comprises components in parts by weight as follows: 60-80 parts of isocyanate and 10-20 parts of a second solvent. The quick-drying scratch-resistant varnish composition with high solid content has quick-drying performance and scratch resistance, further has good paint film property, workability and high construction solid content and is particularly applicable to painting for automobile repairing, and the VOC (volatile organic compounds) can be reduced to 420 g / L or lower.

Description

Technical field [0001] The invention relates to the technical field of coatings, in particular to a high-solid fast-drying scratch-resistant varnish composition, a preparation method and application. Background technique [0002] In order to protect the environment, the development direction of automotive refinish paints is water-based paints and high-solid varnishes. Traditional high-solids varnishes have to meet the high construction solid content, the molecular weight of the resin is small, and the glass transition temperature The low (Tg) point results in a slower initial drying speed of the varnish, and it cannot be polished and assembled according to normal baking conditions or natural drying time, which reduces the production efficiency of car repair. [0003] It is difficult to balance the drying speed and construction solid content of traditional automotive refinish varnishes. The choice of high molecular weight and high Tg resin can increase the drying speed, but often ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/06C09D7/63C08G18/42C08G18/62C08G18/79
CPCC08G18/4063C08G18/42C08G18/6216C08G18/792C08K5/00C09D7/63C09D175/06
Inventor 祁康法戚永君
Owner NIPPON PAINT CHINA