Powder coating with high-temperature-yellowing-resistant function

A technology for powder coatings and high temperature resistance, applied in powder coatings, fireproof coatings, polyester coatings, etc., can solve the limitations of the application and marketing of hydroxyalkylamide curing agents, poor heat resistance, yellowing resistance, and pinholes and other problems, to achieve good sun protection performance, long-term stability and aging resistance, and not easy to decompose

Inactive Publication Date: 2020-02-04
六安捷通达新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, as curing agents for polyester powder coatings, the existing hydroxyalkylamide products on the market will release small molecular compounds during the curing process, so pinholes will inevitably appear when the coating layer is too thick, and such products are resistant to Heat resistance and yellowing resistance are poor, which leads to poor decoration in some occasions, which greatly limits the application and market promotion of hydroxyalkylamide curing agent

Method used

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  • Powder coating with high-temperature-yellowing-resistant function
  • Powder coating with high-temperature-yellowing-resistant function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 4-Hydroxyphenylboronic acid pinacol ester: CAS: 269409-70-3, from Shanghai Xianding Biotechnology Co., Ltd.;

[0029] 2',5-dichloro-2-hydroxybenzophenone: CAS:61785-35-1, from Shanghai Xianding Biotechnology Co., Ltd.;

[0030] Ethyl 4-chlorobenzoate: CAS: 7335-27-5, from Shanghai Xianding Biotechnology Co., Ltd.

[0031] see figure 1 Shown, the synthetic method of modified bishydroxyalkylamide curing agent specifically comprises the following steps:

[0032] The first step is to add 2.05mol 4-hydroxyphenylboronic acid pinacol ester and 32g cesium carbonate to the reaction kettle, then add 12L tetrahydrofuran, stir at room temperature for 30min, after the dissolution is complete, add 1mol 2',5-dichloro -2-Hydroxybenzophenone was slowly poured into the reaction kettle, and the addition was completed within 15 minutes. Then, the temperature was raised to 100°C while stirring, and stirred and refluxed for 14 hours. After the reaction, cooled to room temperature, the crud...

Embodiment 2

[0038] A powder coating with high temperature yellowing resistance, comprising the following raw materials in parts by weight: 60 parts of polyester resin, 3 parts of curing agent, 1 part of smoothing and degassing agent, 1 part of leveling agent, and 30 parts of pigments and fillers;

[0039] The mass ratio of tetrafunctional hydroxyalkylamide curing agent and modified bishydroxyalkylamide curing agent in the curing agent is 17:20;

[0040] The preparation method of the powder coating is as follows: put the raw materials into the mixing tank according to the above ratio, and pre-mix for 5 minutes*3 times; then extrude and tablet on the extruder. The second zone is 115°C, and then the flakes are crushed for fine grinding, and the coarse powder is passed through a rotary sieve to obtain a fine powder of 20-50 microns as the final powder coating.

Embodiment 3

[0042] A powder coating with high temperature yellowing resistance, comprising the following raw materials in parts by weight: 58 parts of polyester resin, 2.5 parts of curing agent, 2 parts of smoothing and degassing agent, 2 parts of leveling agent, and 40 parts of pigment and filler;

[0043] The mass ratio of tetrafunctional hydroxyalkylamide curing agent and modified bishydroxyalkylamide curing agent in the curing agent is 15:20;

[0044] The preparation method of the powder coating is as follows: put the raw materials into the mixing tank according to the above ratio, and pre-mix for 5 minutes*3 times; then extrude and tablet on the extruder. The temperature in the second zone is 113°C, and then the flakes are crushed for fine grinding, and the coarse powder is passed through a rotary sieve to obtain a fine powder of 20-50 microns as the final powder coating.

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Abstract

The invention discloses powder coating with a high-temperature-yellowing-resistant function. The powder coating is prepared from the following raw materials in parts by weight: 58-66 parts of polyester resin, 2.5-5 parts of a curing agent, 1-2 parts of a smoothing degassing agent, 1-2 parts of a flatting agent, and 25-40 parts of pigments and fillers. The polyester resin is taken as a substrate, amixture of a four-degree-of-functionality hydroxyalkyl amide curing agent and a modified dihydroxyalkyl amide curing agent with the mass ratio being (14 to 17):(20 to 22) is taken as the curing agent, the hydroxyalkyl amide curing agent is modified, boron ester bonds, benzene rings and benzophenone structures are introduced in the form of firm chemical bonds, ultraviolet absorbents and anti-yellowing agents do not need to be added, the modified dihydroxyalkyl amide curing agent is applied to the coating, the activity of a curing reaction can be lowered, the pinhole phenomenon of a film is relieved, the high-temperature-resistant stability of the powder coating is further improved, thus the problem that the film is prone to being yellowed at the high temperature is solved, and the anti-aging property of the film can be maintained permanently.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a powder coating with high temperature yellowing resistance. Background technique [0002] Powder coating is a kind of green coating without volatile solvent, which has the advantages of no solvent, low pollution, high material utilization rate and low energy consumption. At present, powder coatings are widely used outdoors, such as transportation facilities, vehicles, exterior wall decoration coatings, etc., which requires them to have strong weather resistance. In recent years, there have been many studies on the weather resistance of powder coatings at home and abroad, and a series of powder coating systems suitable for outdoors have been successfully developed, such as polyester / triglycidyl isocyanurate (TGIC) system, poly Ester / acrylate system, polyurethane system and fluorine-containing, silicon system, etc. [0003] As people's requirements for health and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D5/03C09D5/18C09D7/65C09D7/61C08G63/91
CPCC08G63/91C08K2003/2241C08L2201/02C08L2201/08C08L2205/03C09D5/033C09D5/18C09D167/00C08L91/06C08L33/08C08K3/22C08K3/30
Inventor 鲍远志翁世兵
Owner 六安捷通达新材料有限公司
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