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Subluminous weather-resistant coating powder and preparation thereof

A powder coating, low-light and weather-resistant technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of poor appearance and mechanical properties of powder coating films, increased powder manufacturing costs, unfavorable storage and spraying, etc., to achieve Excellent weather resistance and mechanical properties of the coating film, high glass transition temperature, and low cost

Inactive Publication Date: 2005-05-11
GUANGZHOU QINGTIAN INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a 15% to 40% (60°) low-gloss weather-resistant polyester powder coating is prepared, only by adding matting wax will not only greatly increase the powder manufacturing cost, but also the powder coating will become dull with the increase in the amount of matting wax added. Stickiness is not conducive to storage and spraying, and the appearance and mechanical properties of the powder coating film will also become poor, which limits its application range to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] In the 50-liter reaction kettle equipped with stirrer and distillation column, start the stirrer, add neopentyl glycol, 2-methyl-1,3-propanediol, 1,4-cyclohexane Alkanedimethanol, 1,6-hexanediol, trimethylolpropane, heat up to 160°C until the material melts, the time is 0.5-1.5h; then add terephthalic acid, 50% isophthalic acid, hexane Diacid and dibutyl tin oxide, continue to heat up the reaction with nitrogen, the esterification water starts to be generated and distilled out at about 170°C, control the temperature of the distillation column to be less than 105°C, and then gradually heat in sections to carry out the esterification reaction: 170~180°C for 2 Hours; heating at 180-220°C for 4 hours; heating at 220-230°C for 1 hour; heating at 230-245°C for 4-5 hours. When 95% of the esterified water is discharged and the material is clear, when the acid value reaches 10-18mgKOH / g by sampling, the temperature is lowered by 10-20°C, A adds the remaining isophthalic acid (B ...

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Abstract

A low lustre weather resisting powdery paint is composed of polyester resin A and B. The weight percent of the composition of A is : the new pentadiol 80-100, 2-methyl-1,3-propylene glycol 0-20, 1,4-cyclohexane dimethyl alcohol 0-10,1,6-hexylene glycol 0-5,trimethylolpropane 0-3, terephthalic acid 100-130, m-phthalic acid 10-50, adipic acid 0-5,dibutyl tin oxidate 0.1-0.3; and the B is :the new pentadiol80-100, 2-methyl-1,3-propylene glycol 0-10, 1,4-cyclohexane dimethyl alcohol 0-5, 1,6-hexylene glycol 0-5, trimethylolpropane 0-10, terephthalic acid 120-150, m-phthalic acid 10-50, adipic acid 0-8, dibutyl tin oxidate 0.1-0.3. The A and B are of high transformation temperature, good stability and so on, The paint has the lustre domain of 15-40%.

Description

technical field [0001] The invention relates to a low-light and weather-resistant powder coating, and also relates to a preparation method of the low-light and weather-resistant powder coating. Background technique [0002] Polyester / epoxy hybrid low-gloss powder coatings are limited in scope of use due to poor weather resistance and easy yellowing of the coating, while weather-resistant polyester powder coatings with a gloss greater than 40% (60°) are mainly achieved by adding matting wax. Prepared, such as CIBA's DT3329 and so on. If a 15% to 40% (60°) low-gloss weather-resistant polyester powder coating is prepared, only by adding matting wax will not only greatly increase the powder manufacturing cost, but also the powder coating will become dull with the increase in the amount of matting wax added. Stickiness is not conducive to storage and spraying, and the appearance and mechanical properties of the powder coating film will also become poor, which limits its applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/03C09D167/02
Inventor 陈龙才严来春张捷杨锐龙
Owner GUANGZHOU QINGTIAN INDAL
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