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Self-catalysis fast curing type pure polyester resin as well as preparation method and application thereof

A polyester resin, fast curing technology, used in polyester coatings, coatings, powder coatings, etc., can solve problems such as loss of catalytic activity, poor film performance stability, and inability to guarantee curing speed.

Active Publication Date: 2019-06-14
黄山市向荣新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the additive quaternary ammonium salt curing accelerator often has the problem of high viscosity of the polyester resin in the later stage, and even a very small amount of curing accelerator is unevenly mixed, which will lead to a large difference in curing activity of the same batch of polyester resin; Furthermore, the additive-type quaternary ammonium salt curing accelerators are generally small molecular compounds, which can easily absorb water and lose their catalytic activity, thereby affecting the storage stability of polyester resins; The powder coating prepared by the polyester resin of the amine salt curing accelerator has poor water boiling resistance, and too much free quaternary ammonium salt may cause the final coating to yellow easily, and a small amount of addition cannot guarantee a fast curing speed. Therefore, adding Type curing accelerators often lead to poor film performance stability
[0004] For example, Chinese patent CN107151315A discloses a polyester resin for powder coatings with self-catalytic activity. Although the polyester product can realize self-catalysis, it can only be used for indoor hybrid systems matched with E-12 epoxy resin. However, it cannot be used in outdoor TGIC systems, and its curing conditions still need 180°C / 15min, which cannot meet the needs of rapid curing

Method used

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  • Self-catalysis fast curing type pure polyester resin as well as preparation method and application thereof
  • Self-catalysis fast curing type pure polyester resin as well as preparation method and application thereof
  • Self-catalysis fast curing type pure polyester resin as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The self-catalyzed fast-curing pure polyester resin described in this embodiment, based on the total amount of raw materials for preparing the polyester resin, includes the following raw material components in molar percentages:

[0028]

[0029] The preparation method of self-catalyzed fast curing type pure polyester resin of the present invention comprises the steps:

[0030] (1) Mix the catalyst, terephthalic acid, 1,4-naphthalene dicarboxylic acid, trimethyl-1,6-hexanediol and neopentyl glycol in the formula amount, and first control the temperature below 165°C Esterification reaction 3-6h;

[0031] (2) When the acid value of the mixed material is reduced to 180mgKOH / g or below, nitrogen is introduced into the reaction system for protection, and the temperature of the above mixed material is gradually raised to 205°C at a heating rate of 5°C / h for heat preservation reaction 4-8h;

[0032] (3) When the acid value of the reaction mixture is reduced to 75mgKOH / g o...

Embodiment 2

[0038] The self-catalyzed fast-curing pure polyester resin described in this embodiment, based on the total amount of raw materials for preparing the polyester resin, includes the following raw material components in molar percentages:

[0039]

[0040]

[0041] The preparation method of self-catalyzed fast curing type pure polyester resin of the present invention comprises the steps:

[0042](1) Mix the catalyst, terephthalic acid, 1,4-naphthalene dicarboxylic acid, trimethyl-1,6-hexanediol and neopentyl glycol in the formula amount, and first control the temperature below 165°C Esterification reaction 3-6h;

[0043] (2) When the acid value of the mixed material is reduced to 180mgKOH / g or below, nitrogen is introduced into the reaction system for protection, and the temperature of the above mixed material is gradually raised to 215°C at a heating rate of 5°C / h for heat preservation reaction 4-8h;

[0044] (3) When the acid value of the reaction mixture is reduced to ...

Embodiment 3

[0050] The self-catalyzed fast-curing pure polyester resin described in this embodiment, based on the total amount of raw materials for preparing the polyester resin, includes the following raw material components in molar percentages:

[0051]

[0052] The preparation method of self-catalyzed fast curing type pure polyester resin of the present invention comprises the steps:

[0053] (1) Mix the catalyst, terephthalic acid, 1,4-naphthalene dicarboxylic acid, trimethyl-1,6-hexanediol and neopentyl glycol in the formula amount, and first control the temperature below 165°C Esterification reaction 3-6h;

[0054] (2) When the acid value of the mixed material is reduced to 180mgKOH / g or below, nitrogen is introduced into the reaction system for protection, and the temperature of the above mixed material is gradually raised to 210°C at a heating rate of 5°C / h for heat preservation reaction 4-8h;

[0055] (3) When the acid value of the reaction mixture is reduced to 75mgKOH / g o...

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Abstract

The invention belongs to the technical field of powdery paint, and particularly relates to self-catalysis fast curing type pure polyester resin, and further discloses a preparation method of the elf-catalysis fast curing type pure polyester resin and a purpose of the elf-catalysis fast curing type pure polyester resin for preparing outdoor TGIC powder paint. The self-catalysis fast curing type pure polyester resin is prepared by using terephthalic acid, 1,4-naphthalic acid, trimethyl-1,6-hexanediol, neopentyl glycol, 1,2,4-butanediol, gamma-trimethylamine-beta-hydroxybutyric acid, N,N,N-trimethyl-2-hydroxyhexadecyl ammonium chloride and glycol bis(2-aminoethyl ether) tetraacethyl as raw materials through polymerization. The self-catalysis performance of the polyester resin is prominent; the curing activity is high; under the condition without additionally adding a curing accelerant, the fast curing with a curing agent TGIC can be realized. A curing membrane prepared by the self-catalysis fast curing type pure polyester resin has excellent performance; the performance in all aspects better reaches the use requirements of outdoor pure polyester resin.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, in particular to a self-catalyzed fast-curing pure polyester resin, and further discloses its preparation method and its application for preparing outdoor TGIC powder coatings. Background technique [0002] Powder coating is a 100% solid powder that does not contain organic solvents. It is different from oil-based paints and water-based paints. It does not use solvent or water as a dispersion medium when coating, but uses air as a dispersion medium to evenly coat the workpiece. The surface is a new type of environmentally friendly paint that forms a special-purpose coating film after heating. Powder coating has the advantages of no VOC, environmental protection, energy saving, high construction efficiency and wide application range. With its advantages of economy, environmental protection, high efficiency and excellent performance, it is gradually replacing organic solvent-based coatings ...

Claims

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Application Information

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IPC IPC(8): C08G63/685C09D167/02C09D5/03
Inventor 郑荣辉毕海鹏江蓉冯小浩张齐
Owner 黄山市向荣新材料有限公司
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