Terminal hydroxyl polyester resin for co-extrusion extinction powder coating and preparation method of terminal hydroxyl polyester resin

A matte powder coating and hydroxyl-terminated polyester technology, used in powder coatings, polyester coatings, coatings, etc., can solve the problems of increased external influencing factors, high requirements for active resin, increased difficulty, etc., and achieve good storage stability. The effect of stability, good leveling effect

Inactive Publication Date: 2015-03-25
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the second technology is adopted, the requirements for the active resin used are very high. Firstly, it increases the difficulty in production, and the stability of the product is not easy to control. Secondly, the number of steps in the milling process increases, which increases the cost and external factors. If the third method is adopted, it can not only save time, but also reduce production costs, which is the future development trend

Method used

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  • Terminal hydroxyl polyester resin for co-extrusion extinction powder coating and preparation method of terminal hydroxyl polyester resin
  • Terminal hydroxyl polyester resin for co-extrusion extinction powder coating and preparation method of terminal hydroxyl polyester resin
  • Terminal hydroxyl polyester resin for co-extrusion extinction powder coating and preparation method of terminal hydroxyl polyester resin

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coatings, comprising the following components by weight:

[0032]

[0033] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coating comprises the following steps:

[0034] a. Esterification process: In a synthetic reaction vessel, put 0.2 parts of neopentyl glycol and 9.9 parts of trimethylolpropane into the material and heat until the material melts. The heating temperature is 80°C, and then 8.8 parts of isophthalic acid, 1.2 parts of terephthalic acid and 0.02 parts of monobutyltin oxide, after sealing the kettle, gradually heat the reaction in a nitrogen atmosphere, slowly raise the temperature to 230°C and maintain it until no distillate is formed. At this time, the acid value of the reactant is 4.6 mgKOH / g;

[0035] b. Vacuum process: Add 0.02 parts of triphenyl phosphite antioxidant to the reactant obtained in the esterification process, and react when th...

Embodiment 2

[0037] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coatings, comprising the following components by weight:

[0038]

[0039] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coating comprises the following steps:

[0040] a. Esterification process: In the synthesis reaction vessel, put 0.12 parts of neopentyl glycol and 10.0 parts of trimethylolpropane into the material and heat until the material melts. The heating temperature is 70° C., and then 7.6 parts of isophthalic acid, 2.5 parts of terephthalic acid and 0.026 parts of monobutyltin oxide, after sealing the kettle, gradually heat the reaction in a nitrogen atmosphere, slowly raise the temperature to 235°C and maintain it until no distillate is formed. At this time, the acid value of the reactant is 4.3 mgKOH / g;

[0041] b. Vacuum process: Add 0.026 parts of triphenyl phosphite antioxidant to the reactant obtained in the esterification process, and react...

Embodiment 3

[0043] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coatings, comprising the following components by weight:

[0044]

[0045] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coating comprises the following steps:

[0046] a. Esterification process: In the synthesis reaction vessel, put 10.1 parts of trimethylolpropane into the material and heat until the material melts at a temperature of 90°C, then put 8 parts of isophthalic acid, 2 parts of terephthalic acid and 0.023 parts of monobutyltin oxide, after sealing the kettle, gradually heat the reaction in a nitrogen atmosphere, slowly raise the temperature to 235°C and maintain it until no distillate is formed. At this time, the acid value of the reactant is 4.0mgKOH / g;

[0047] b. Vacuum process: Add 0.023 parts of triphenyl phosphite antioxidant to the reactant obtained in the esterification process, and react when the temperature is lowered to 200°C and the v...

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Abstract

The invention discloses terminal hydroxyl polyester resin for co-extrusion extinction powder coating and a preparation method of the terminal hydroxyl polyester resin. The terminal hydroxyl polyester resin comprises trimethylolpropane, terephthalic acid, isophthalic acid, neopentyl glycol, an antioxygen and an esterification catalyst. Compared with the prior art, the synthesized polyester resin has the advantages that the glass transition temperature Tg of the polyester resin is higher than 51 DEG C; the polyester resin can provide a good storage stability; the viscosity is 2800-3000mPa.s (200 DEG C), and a good leveling effect can be provided due to the low viscosity; the polyester resin has a high hydroxyl value, carries out co-extrusion extinction with a low hydroxyl value, and has low luster being 7-10 percent.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a hydroxyl-terminated polyester resin for co-extrusion matting powder coatings and a preparation method thereof. Background technique [0002] With the rapid development of the powder coating industry, matting coatings are widely used in decoration and construction. There are many methods for powder coating matting: 1. Realize matting by adding physical or chemical matting agents; 2. Use two active resins to make powders, dry mix them at a weight ratio of 1:1, and then spray them using two groups. According to the difference in curing rate to achieve matting, low gloss can be obtained without adding any matting agent; 3. By co-extruding the two resins and curing agent according to the weight ratio to make powder spraying, it can be made into a lower gloss Glossy matte paint. [0003] When the second technology is adopted, the requirements for the active resin used are very high. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C09D167/02C09D7/12C09D5/03
Inventor 刘志坚吴德清张全栋焦金牛汪俊
Owner ANHUI SHENJIAN NEW MATERIALS
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