Method for preparing polyester resin for automobile coating

A polyester resin and coating technology, which is applied in the field of preparation of polyester resin for automotive coatings, can solve the problems of insufficient product performance and insufficient quality, and achieve the effects of overcoming large losses, stable product quality, and ensuring accuracy

Inactive Publication Date: 2016-06-22
LIUZHOU SHENTONG AUTOMOBILE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyester resin for automotive coatings produced by the prior art is due to limitations in equipment and technology, the product performance is not good enough, the quality is not high enough, and new technology is urgently needed to prepare high-tech, environmentally friendly products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] A preparation method of polyester resin for automotive coatings, comprising the following steps:

[0018] First, put solid terephthalic acid, isophthalic acid, adipic acid, trimethylolpropane, ethylene glycol, neopentyl glycol, and antimony trioxide in an airtight container and mix them uniformly by mass fraction; Dicarboxylic acid and isophthalic acid can improve the hardness, weather resistance and chemical resistance of the product; adipic acid can maintain the universality and flexibility of the product; the steric hindrance effect of the methyl group of trimethylolpropane can shield The ester group of polyester improves hydrolysis resistance and can introduce branches at the same time; neopentyl glycol has good hydrolysis resistance and weather resistance, and the prepared product is hard and tough, and has strong anti-fouling ability; ethylene glycol has better The universality and flexibility; antimony trioxide as a catalyst can promote the polycondensation react...

Embodiment 1

[0022] In terms of mass fraction, 10 parts of terephthalic acid, 10 parts of isophthalic acid, 5 parts of adipic acid, 5 parts of trimethylolpropane, 1 part of ethylene glycol, 25 parts of neopentyl glycol and 0.1 part of antimony trioxide Put it in a closed container and mix evenly; then pass nitrogen into the container, then heat up to 100°C, stir at a low speed after most of the raw materials start to melt, then heat up to 150°C, keep it warm for 30 minutes, and then use 0.3°C / min The heating rate was increased to 230°C until the reaction was complete. Then stop feeding nitrogen, then extract the gas in the container, make the vacuum less than -98kPa, and remove the water and small molecule products generated in the reaction; then restore the container to normal pressure, and add 1 part of trimellitic anhydride to stir, and keep the temperature at 160 °C, the acid value is 12 mgKOH / g, and finally a polyester resin is obtained. The polyester resin is used for automobile pai...

Embodiment 2

[0024] In terms of mass fraction, 15 parts of terephthalic acid, 16 parts of isophthalic acid, 3 parts of adipic acid, 3 parts of trimethylolpropane, 3 parts of ethylene glycol, 20 parts of neopentyl glycol and 0.15 parts of antimony trioxide Put it in a closed container and mix evenly; then pass nitrogen into the container, heat up to 110°C, stir at a low speed after most of the raw materials start to melt, then raise the temperature to 150°C, keep it warm for 25 minutes, and then use 0.4°C / min The heating rate was increased to 240°C until the reaction was complete. Then stop feeding nitrogen, then extract the gas in the container, make the vacuum less than -98kPa, and remove the water and small molecule products generated in the reaction; then restore the container to normal pressure, and add 1.5 parts of trimellitic anhydride to stir, keeping the temperature at 180 °C, the acid value is 16 mgKOH / g; finally a polyester resin is obtained. The polyester resin is used for auto...

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Abstract

The invention relates to a method for preparing polyester resin for an automobile coating.The method includes the steps that by mass, solid terephthalic acid, isophthalic acid, adipic acid, trimethylolpropane, ethanediol, neopentyl glycol and antimonous oxide are placed into a closed container to be mixed to be uniform; nitrogen gas is introduced into the container, and the mixed materials are stirred, heated and subjected to a melting reaction; then, intensity of pressure in the container is reduced, and water and micromolecule products generated in the reaction are removed; then trimellitic anhydride is added to conduct a stirring and heating reaction, and the polyester resin is obtained after the reaction is completed.According to the method, the polyester resin is obtained through melt phase polycondensation, due to the fact that a high temperature is required to be adopted for melting, dihydric alcohol of a low boiling point is discharged out of a system easily, and accuracy of feeding can be guaranteed.Meanwhile, the defect that the loss of organic alcohol is large can be overcome, and the method has the advantages of being high in reaction speed, stable in reaction process, stable in product mass and the like.

Description

technical field [0001] The invention relates to automobile coatings, in particular to a method for preparing polyester resins for automobile coatings. Background technique [0002] Automotive paint is a kind of paint with high requirements and high technical content, mainly including primer, intermediate paint and top coat. The water-based process of automotive coatings is carried out gradually from the bottom to the surface. As early as the 1960s, developed countries such as Europe and the United States have taken the lead in using water-based electrophoretic primers. At present, more than 90% of the primers are water-based paints, and 88% of the cars are made of water-based paints. Water-based cathodic electrophoretic paint is also used in the coating, but most of the intermediate coatings still use solvent-based coatings. Due to the relatively high technical difficulty of water-based topcoat, the water-based process is somewhat slow, and it is rarely used in the automoti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/86C09D167/02
CPCC08G63/20C08G63/86C09D167/02
Inventor 钟静清韦晗
Owner LIUZHOU SHENTONG AUTOMOBILE TECH CO LTD
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