Acid epoxy high-temperature curing type coating varnish for automobile exterior coating and preparation method thereof

A high-temperature curing, overcoating varnish technology, applied in coatings, polyester coatings, etc., can solve problems such as damage, corrosion, weak chemical structure, etc.

Active Publication Date: 2019-05-21
湖南湘江关西涂料(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The chemical structure of the traditional acrylic acid-amino varnish crosslinked is an ether bond structure, which is weak and vulnerable to the invasion of strong oxidizing hydrogen ions in the acid, which is destroyed and causes corrosion:

Method used

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  • Acid epoxy high-temperature curing type coating varnish for automobile exterior coating and preparation method thereof
  • Acid epoxy high-temperature curing type coating varnish for automobile exterior coating and preparation method thereof
  • Acid epoxy high-temperature curing type coating varnish for automobile exterior coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0067] Reference example 1: the synthetic preparation of the thermosetting acrylic resin that the total acid value that the present invention uses is 120-140:

[0068] The acid value comes from the introduction of maleic anhydride monomer.

[0069] 1) The distribution of raw materials used in resin synthesis is shown in the table below.

[0070] raw material name

parts by weight

n-Butyl methacrylate

153.1

n-butyl acrylate

48.1

Styrene

131.3

maleic anhydride

105.0

Solvent: trimethylbenzene

178.0

Solvent: ethyl 3-ethoxypropionate

210

Solvent: Butanol

55

total

890.5

[0071] 2) In a four-necked flask equipped with a stirrer, a thermometer, a condenser, a water separator and a nitrogen device, add 110 parts by weight of styrene, n-butyl methacrylate, n-butyl acrylate, and trimethylbenzene according to the formula , Turn on and stir until uniform, and use jacket cooling to ke...

reference example 2

[0073] Reference example 2: the present invention uses the synthetic preparation of the thermosetting acrylic resin of epoxy value 2.0-4.0:

[0074] The epoxy value comes from the introduction of glycidyl methacrylate.

[0075] 1) The distribution of raw materials used in resin synthesis is shown in the table below.

[0076] raw material name

parts by weight

n-butyl acrylate

150

2-Hydroxyethyl methacrylate

120

Isobutyl methacrylate

60

4-Hydroxybutyl Acrylate

30

Styrene

30

Glycidyl methacrylate

210

Catalyst: di-tert-amyl peroxide

20

Solvent: trimethylbenzene

180

Solvent: Butanol

68

total

868

[0077] 2) In a four-necked flask equipped with a stirrer, a thermometer, a condenser, a water separator and a nitrogen device, add styrene, glycidyl methacrylate, and 2-hydroxyethyl methacrylate according to the formula in the above table. ester, n-butyl acrylat...

reference example 3

[0079] Reference example 3: the preparation of the anti-sagging additive containing fumed silica used in the present invention:

[0080] The gas phase silica is evenly dispersed into the resin through the dispersion equipment:

[0081] 1) See the table below for the weight ratio of raw materials

[0082]

[0083] 2) Put 60% glass beads of 1.0-1.4mm specification in a sealable container, then add the materials in Table 3, keep the total volume of glass beads and dispersion not exceeding 85% of the container volume, and seal it;

[0084] 3) Fix the sealed container in a high-speed shaker and shake it for more than 30 minutes, the speed is controlled at 500-700 times / min, until the fineness of the dispersion is less than 20 microns, and the anti-sag additive containing fumed silica is obtained .

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Abstract

The invention discloses an acid epoxy high-temperature curing type coating varnish for automobile exterior coating and a preparation method thereof. The varnish is prepared from the following components: thermosetting acrylic resin having a total acid value of 120 to 140, thermosetting acrylic resin having an epoxy value of 2.0 to 4.0, anti-sagging resin, saturated polyester containing a hexahydrophthalic anhydride monomer, amino resin, an ammonium bromide catalyst, a catalyst blocking agent, a leveling agent, a polyacrylate antifoaming agent, an ultraviolet absorber, a hindered amine light stabilizer, an anti-sagging aid containing fumed silica, an alcohol solvent and a diluent. The invention also discloses a preparation method of the varnish. The varnish disclosed by the invention has the characteristics of high construction solid content, attractive appearance, high acid resistance and the like, and has relatively high competitiveness in the market.

Description

technical field [0001] The invention relates to an acid epoxy high-temperature curing type finish varnish for automobile exterior coating and a preparation method thereof. Background technique [0002] In the prior art, the curing mechanism of acrylic acid-amino finish varnish for automobiles is: [0003] [0004] Note: R group is -C 4 h 9 or -CH 3 [0005] In the curing process shown in the above reaction formula, due to system reasons, small molecules will be released during curing, resulting in volume shrinkage and poor masking performance, which will result in poor smoothness of the matching topcoat, resulting in unsightly appearance of the product, which is not easy to be accepted by customers. [0006] Acrylic acid-amino varnish construction solid state in the prior art: [0007] The main resin of the prior art acrylic-amino varnish for automobiles is composed of acrylic acid and amino resin. Due to the resin itself, the crosslinking density is not high enough....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/10C09D167/00C09D161/32C09D7/65C09D7/61C08F220/18C08F212/08C08F222/06C08F220/20C08F220/32
Inventor 杨思志邓华坤李植张杰黄克仁
Owner 湖南湘江关西涂料(长沙)有限公司
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