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Preparation method of polyester resin

A technology of polyester resin and polymerization degree, which is applied in the field of polyester resin preparation, can solve the problems of high cost of powder coating, influence on popularization and use, and high price of epoxy resin, achieve good gloss, reduce waste pollution, and reduce production cost Effect

Inactive Publication Date: 2013-07-17
江苏宝田新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Hybrid powder coatings are also called polyester-epoxy hybrid powder coatings. According to the curing ratio of polyester and epoxy resin, they can be divided into three types: 50 / 50, 60 / 40, and 70 / 30. Among them, 50 / 50 The proportion of epoxy resin in the type powder coating is the highest, so it is better in terms of impact performance and corrosion resistance, but because the price of epoxy resin is generally relatively high, the cost of the prepared powder coating is also higher, affecting Promoted the use of polyester resins for hybrid powder coatings

Method used

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  • Preparation method of polyester resin
  • Preparation method of polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] step one:

[0019] First crush 1030Kg of polyester waste (PET) to a particle size of 2-3mm, then add it to the alcoholysis reactor, add 170Kg of neopentyl glycol (NPG), and 129Kg of 2-methyl-1,3-propanediol (MPO) , 1.4Kg alcoholysis catalyst monobutyltin oxide (MBTO) and 1Kg zinc acetate for alcoholysis, the alcoholysis temperature is 220°C-250°C, when the temperature at the top of the tower drops to 80±5°C, the alcoholysis ends and is removed by filtration impurities;

[0020] Step two:

[0021] Add the melt obtained by filtering in step 1 into the esterification reactor, add 270Kg of purified terephthalic acid (PTA), and 0.8Kg of stabilizer triphenyl phosphite (TPP); carry out transesterification at 235°C to 250°C And esterification reaction, when the temperature at the top of the tower drops to 80±5°C (the water generated by the reaction does not distill out under normal pressure), take a sample, test the acid value and viscosity at 150°C, when the acid value is 28...

Embodiment 2

[0026] Reaction step is similar to embodiment 1, and reaction raw material and adding quality are as follows:

[0027]

[0028]

[0029] The performance test of the obtained product: the gloss is 95° tested by the gloss meter, and the paint film impact meter impacts the board surface, and there is no crack in the front impact of 50KG and recoil of 45KG.

Embodiment 3

[0031] Reaction step is similar to embodiment 1, and reaction raw material and adding quality are as follows:

[0032]

[0033] The performance test of the obtained product: the gloss is 85° tested by a gloss meter, and the paint film impact meter impacts the board surface, and there is no crack in the front impact of 50KG and recoil of 45KG.

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Abstract

The invention discloses a preparation method of polyester resin. The preparation method comprises the following steps of: carrying out alcoholysis on dacron, polybasic alcohol, an alcoholysis catalyst zinc acetate and monobutyl tin oxide; carrying out ester exchange reaction and esterification reaction on the molten mass, which is obtained after the alcoholysis, polyprotic acid and a stabilizer phosphite ester triphenyl ester; after the ester exchange reaction and esterification reaction, carrying out decompression polycondensation reaction; adding trimellitic anhydride and a curing agent octadecyl hexadecyl tertiary amine; and filtering impurities after reaction to obtain the polyester resin. By adopting the technical scheme disclosed by the invention, PET (polyethylene terephthalate) type waste materials with various shapes and performances can be used for producing the polyester resin, the recycling of waste and old PET is realized, an effect of environmental friendliness is achieved, the production cost is reduced, and compared with the prior art, the reduction degree reaches more than 10%. The polyester resin obtained by adopting the technical scheme has good luster, impact resistance and leveling performance, and the waste pollution caused by dacron and PTA (pure terephthalic acid) is reduced.

Description

technical field [0001] The invention relates to a preparation method of polyester resin, in particular to a preparation method of dark polyester resin for powder. Background technique [0002] As we all know, polyester resins for thermosetting powder coatings are mostly made of thermosetting saturated polyester resins by polycondensation reaction of aromatic hydroxy acids (or anhydrides) and polyols. The polyol can be polyester polyol, ethylene glycol, diethylene glycol or mixtures thereof. The products are used in the manufacture of epoxy polyester powder coatings, pure polyester powder coatings and polyurethane powder coatings. The use of one polyol cannot meet the performance requirements of polyester, and it is often necessary to rationally mix and use multiple alcohols to achieve the best performance of polyester. Generally speaking, the deployment and use of various alcohols is beneficial to improve the gloss, viscosity, flow and other properties of polyester, thereb...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08K5/17C08G63/20C08G63/672C08J11/24C09D167/02
CPCY02W30/62
Inventor 蒋云徐振华
Owner 江苏宝田新材料股份有限公司
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