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Polyester resin for high-weather-resistance low-temperature TGIC cured powder coating and preparation method thereof

A powder coating and polyester resin technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of reducing the weather resistance of coating films, low melt viscosity and glass transition temperature of polyester resins, and low-temperature curing of coating films. Frost and other problems, to achieve the effect of excellent weather resistance, good leveling performance

Active Publication Date: 2020-08-14
ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the low-temperature TGIC curing powder coating mainly has the following two problems: one is that the weather resistance of the coating film is not enough, and the weather resistance is not good;
The weather resistance of the coating film is not good, the main reason is that the curing crosslinking activity and crosslinking density between the matrix resin and the curing agent TGIC are not enough, and the coating film cannot be fully cured under low temperature conditions, thereby affecting the weather resistance; in addition, in order to solve the problem of low temperature curing Frost, some use the introduction of unsaturated carboxylic acids or anhydrides, such as maleic anhydride and fumaric acid, the introduction of these unsaturated carboxylic acids or anhydrides reduces the weather resistance of the coating film
Third, in order to make the low-temperature curing coating have better leveling, the melt viscosity and glass transition temperature of polyester resin are generally low, resulting in poor powder storage

Method used

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  • Polyester resin for high-weather-resistance low-temperature TGIC cured powder coating and preparation method thereof
  • Polyester resin for high-weather-resistance low-temperature TGIC cured powder coating and preparation method thereof
  • Polyester resin for high-weather-resistance low-temperature TGIC cured powder coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] The concrete implementation synthesis process is: (1) in the reactor 5000ml that is equipped with heating device, agitator and distillation column, the polyol component A (wherein 1095 parts of neopentyl glycols of 1095 parts, 25 parts of three Methylol propane), the normal pressure is heated to 110-130 ℃; 1690 parts of polyacid component B (wherein 1610 parts of terephthalic acid, 80 parts of adipic acid) and 3.5 parts of esterification catalyst group are added into the formula Divide into C (3.5 parts of monobutyltin oxide), and gradually heat up while stirring. (2) The temperature of the material rises to 160-170°C, the esterification reaction begins, and the esterification water begins to be generated and steamed out through the distillation column. The steam temperature at the top of the distillation column is controlled at 100°C ± 1°C; Esterification water is distilled out, and when the temperature of the material rises to 245°C ± 2°C, heat preservation reaction i...

Embodiment 2

[0038] The concrete implementation synthesis process is: (1) in the reactor 5000ml that is equipped with heating device, stirrer and distillation column, the polyol component A (wherein 920 parts of neopentyl glycols, 100 parts of 2 -Methyl-1,3-propanediol, 75 parts of 2-butyl-2-ethyl-1,3-propanediol, 50 parts of tris(2-hydroxyethyl)isocyanurate)), the temperature is raised to 110-130°C; 1590 parts of polyacid component B (1410 parts of terephthalic acid, 480 parts of isophthalic acid) and 3.5 parts of esterification catalyst component C (3.5 parts of monobutyl tin oxide), and gradually heated up while stirring. (2) The temperature of the material rises to 160-170°C, the esterification reaction begins, and the esterification water begins to be generated and steamed out through the distillation column. The steam temperature at the top of the distillation column is controlled at 100°C ± 1°C; Esterification water is distilled out, and when the temperature of the material rises t...

Embodiment 3

[0040] The concrete implementation synthesis process is: (1) in the reactor 5000ml that is equipped with heating device, stirrer and distillation column, the polyol component A (wherein 925 parts of neopentyl glycols, 80 parts of 2 -Methyl-1,3-propanediol, 90 parts of 2-butyl-2-ethyl-1,3-propanediol, 70 parts of tris(2-hydroxyethyl)isocyanurate)), the temperature is raised to 110-130°C; 1630 parts of polyacid component B (1030 parts of terephthalic acid, 600 parts of isophthalic acid) and 3.5 parts of esterification catalyst component C (3.5 parts of monobutyl tin oxide), and gradually heated up while stirring. (2) The temperature of the material rises to 160-170°C, the esterification reaction begins, and the esterification water begins to be generated and steamed out through the distillation column. The steam temperature at the top of the distillation column is controlled at 100°C ± 1°C; Esterification water is distilled out, and when the temperature of the material rises to...

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Abstract

The invention relates to polyester resin for powder coating and a preparation method of the polyester resin, and particularly provides saturated carboxyl-terminated polyester resin for high-weather-resistance low-temperature TGIC cured powder coating and a preparation method thereof. The polyester resin is prepared from the following main components in percentage by mass through melt polymerization: a polyol component A, a polybasic acid component B, an esterification catalyst component C, an acidolysis agent component D, an antioxidant component E and a curing catalyst component F. The methodcomprises the following steps: adding the component A, then adding the component B and the component C, and gradually heating while stirring; carrying out a melt esterification condensation reaction;adding the component D, and carrying out an acidolysis reaction; performing reduced pressure reaction; adding the component E and the component E, and stirring for reaction; cooling, discharging, cooling and crushing. The TGIC cured powder coating provided by the invention can be cured under the condition of 150-160 DEG C / 15-25 min, and an obtained coating film has excellent weather resistance and also has good leveling property, frosting resistance and other decorative properties.

Description

technical field [0001] The invention relates to the technical field of polyester resins for powder coatings, in particular to a polyester resin for high weather resistance and low temperature TGIC curing powder coatings and a preparation method thereof Background technique [0002] Coating refers to a kind of liquid or solid material that can form a thin film on the surface of an object under certain conditions to protect, decorate or other special functions (insulation, rust prevention, mildew resistance, heat resistance, etc.). There are extensive and irreplaceable applications in life, social production, and national industrialization. Powder coatings are different from traditional paints and coatings. They are 100% solids and VOC-free coatings. They are economical, environmentally friendly, high-efficiency, and excellent in performance. They are recognized as green and environmentally friendly coatings. One of the major directions. [0003] The powder coating curing sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685C09D167/00C09D5/03C09D7/63C09D7/61
CPCC08G63/6854C09D167/00C09D5/033C08K2003/2241C08K2003/3045C08K13/02C08K3/22C08K3/30C08K5/34924
Inventor 应明友刘义邱锋利汤明麟童徐圆章道军储坚刚
Owner ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD