Polyester resin for weather-proof and impact-resisting powder coating and preparation method of polyester resin

A technology of powder coating and polyester resin, which is applied in the field of polyester resin, can solve the problems such as the impact of polyester resin on impact performance, and achieve the effects of good storage stability, excellent weather resistance and impact resistance

Inactive Publication Date: 2015-02-18
GUANGZHOU KINTE IND
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of a large amount of weather-resistant monomer IPA has a greater impact on the impact properties of polyester resins

Method used

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  • Polyester resin for weather-proof and impact-resisting powder coating and preparation method of polyester resin

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Experimental program
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Embodiment Construction

[0028] (1) Add neopentyl glycol, terephthalic acid, isophthalic acid, trimethylolpropane and monobutylene in the proportioning amount in Table 1 in the 100L reactor equipped with distillation column, agitator, and heating device Based on tin oxide, heat until the material melts, start stirring with nitrogen, the stirring rate is 30-50r / min, continue to heat up the reaction, at about 180°C, esterification water begins to be formed and distilled, and then the temperature rises at 10-20°C / h Gradually raise the temperature to 240-250°C, keep it warm for 3-5 hours, and measure the acid value when the column top temperature drops to about 40°C and the material is clear. The acid value range is 12-15mgKOH / g.

[0029] (2) Take isophthalic acid, an acidolysis agent, and add it to the above-mentioned reaction kettle, and continue the heat preservation reaction at 240°C for 3-5 hours. 35mgKOH / g, the reaction can be stopped when the viscosity reaches 5000-6000mPa?s, and the vacuum is rele...

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Abstract

The invention discloses polyester resin for a weather-proof and impact-resisting powder coating. The polyester resin is mainly prepared through polycondensation and synthesis of raw materials in percentage by weight as follows: 34%-40% of polyhydric alcohol, 50%-60% of polyatomic acid, 0.1%-0.5% of a branching agent, 0.05%-1.0% of an esterification catalyst, 5%-10% of an acidulation agent, 0.05%-1.0% of a curing accelerator and 0.4%-0.8% of an antioxidant. The invention further discloses a preparation method of the polyester resin. The polyester resin has excellent weather resistance and impact resistance, simultaneously has good levelling property, appropriate glass transition temperature and better storage stability and is applicable to a TGIC (triglycidyl isocyanurate)-polyester powder curing system.

Description

technical field [0001] The invention relates to a polyester resin, in particular to a polyester resin for weather-resistant and impact-resistant powder coatings. The invention also relates to a preparation method of the polyester resin. technical background [0002] In recent years, with the rapid advancement of my country's large-scale infrastructure investment and industrialization process, aluminum profiles, as an important application material in the field of construction and machinery industry, have seen rapid growth in production and consumption in the entire industry, and my country has also become the world's largest The largest aluminum profile production base and consumer market. [0003] There are three treatment methods for the surface treatment of aluminum profiles: anodic oxidation, electrophoretic coating and powder coating spraying, each of which occupies a considerable market share. Among them, powder coating has become an important branch of aluminum profi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/78C08K5/134C08K5/3492C08K5/526C08K5/524C09D175/06C09D7/12C09D5/03
Inventor 陈闯王伟跃何涛林锡恩陶志荣
Owner GUANGZHOU KINTE IND
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