Preparation method of hydroxyl-terminated polyester resin for co-extruding extinction powder coating

A technology of matting powder coatings and hydroxyl-terminated polyesters, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of increased external influencing factors, high requirements for active resins, and increased steps to achieve good storage stability sexual effect

Inactive Publication Date: 2015-02-18
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, t...

Method used

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  • Preparation method of hydroxyl-terminated polyester resin for co-extruding extinction powder coating
  • Preparation method of hydroxyl-terminated polyester resin for co-extruding extinction powder coating
  • Preparation method of hydroxyl-terminated polyester resin for co-extruding extinction powder coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coatings, comprising the following components by weight:

[0021]

[0022] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coating comprises the following steps:

[0023] 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;

[0024] 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

[0026] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coatings, comprising the following components by weight:

[0027]

[0028] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coating comprises the following steps:

[0029] 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;

[0030] b. Vacuum process: Add 0.026 parts of triphenyl phosphite antioxidant to the reactant obtained in the esterification process, and react...

Embodiment 3

[0032] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coatings, comprising the following components by weight:

[0033]

[0034] A kind of hydroxyl-terminated polyester resin for co-extrusion matting powder coating comprises the following steps:

[0035] 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;

[0036] 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 a preparation method of hydroxyl-terminated polyester resin for co-extruding an extinction powder coating. The preparation method comprises the following steps: adding dihydric alcohol and a branching agent into a synthetic reaction container, heating until materials are molten, adding p-terephthalic acid, m-phthalic acid and an esterified catalyst, then adding an antioxidant for reacting, to obtain the hydroxyl-terminated polyester resin for co-extruding the extinction powder coating. Compared with the prior art, the synthesized polyester resin has the following advantages that the glass transition temperature Tg of the polyester resin is more than 51 DEG C, and the storage stability can be provided; the viscosity is 2800-3000Pa.s (200 DEG C), and low viscosity can provide a good leveling effect; and the polyester resin has high hydroxyl value and can be subjected to coextrusion and extinction together with polyester resin having low hydroxyl value, and has low glossiness of 7-10%.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a method for preparing a hydroxyl-terminated polyester resin for co-extrusion matting powder coatings. 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. Firstly, i...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/78C08K5/524C08K5/526C09D167/02C09D5/03
Inventor 刘志坚吴德清张全栋焦金牛汪俊
Owner ANHUI SHENJIAN NEW MATERIALS
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