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Curing agent for pure polyester powder coating system and preparation method thereof

A technology of polyester powder and curing agent, used in powder coatings, polyester coatings, coatings, etc., can solve the problems of insufficient leveling on the surface of the coating film, prone to pinholes, unsatisfactory application or application effect, etc. Enhance outdoor weather resistance, moderate speed effect

Active Publication Date: 2019-01-01
安徽徽州正杰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the β-hydroxyalkylamide (HAA) curing agent used in the pure polyester resin powder coating system has a high hydroxyl value, generally 650-700mgKOH / g, high curing activity and fast curing speed, resulting in leveling of the coating surface Insufficient resistance, high leveling coating film is difficult to obtain, and it is easy to have pinholes when used for thick film coating above 120μm, so it cannot be used in thick film coating
Therefore, in practical applications, due to the above problems, its application is limited or the application effect is not ideal

Method used

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  • Curing agent for pure polyester powder coating system and preparation method thereof
  • Curing agent for pure polyester powder coating system and preparation method thereof
  • Curing agent for pure polyester powder coating system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A curing agent composition for pure polyester powder coating system, the components include 15 mol of dimethyl adipate, 25 mol of 1,3,5-cyclohexanetricarboxylic acid, 10 mol of hexahydrophthalic acid, 8 mol of diethanolamine, Tetrafluorobutanediol 10mol, triisopropanolamine 8mol, 1,1-cyclopentanedimethanol 14mol, pentaerythritol 10mol, tetraethoxytitanium 0.2mol, antioxidant 300, 0.3mol.

[0030] The preparation method of described pure polyester powder coating system hardener composition is, comprises and steps:

[0031] A. Add diethanolamine, tetrafluorobutanediol, triisopropanolamine, and 1,1-cyclopentanedimethanol into the reactor, and heat and melt at 105°C;

[0032] B, add the dimethyl adipate of formula quantity, 1,3,5-cyclohexane tricarboxylic acid, hexahydrophthalic acid in above-mentioned mixture material, add the catalyst tetraethoxytitanium of formula quantity simultaneously, in Under the protection of nitrogen, gradually increase the temperature until no o...

Embodiment 2

[0038] A curing agent composition for a pure polyester powder coating system, the components include dimethyl adipate 8mol, 1,3,5-cyclohexanetricarboxylic acid 28mol, hexahydrophthalic acid 12mol, diethanolamine 9mol, Tetrafluorobutanediol 18mol, triisopropanolamine 9mol, 1,1-cyclopentanedimethanol 6mol, pentaerythritol 10mol, tetraethoxytitanium 0.3mol, antioxidant 300, 0.4mol.

[0039] The preparation method is the same as in Example 1.

[0040] Prepared curing agent product index:

[0041] Appearance: Colorless transparent particles, the hydroxyl value is 242mgKOH / g, and the softening point is 121°C.

Embodiment 3

[0043] A curing agent composition for pure polyester powder coating system, the components include 15 mol of dimethyl adipate, 23 mol of 1,3,5-cyclohexanetricarboxylic acid, 11 mol of hexahydrophthalic acid, 11 mol of diethanolamine, Tetrafluorobutanediol 15mol, triisopropanolamine 10mol, 1,1-cyclopentanedimethanol 5mol, pentaerythritol 10mol, tetraethoxytitanium 0.2mol, antioxidant 300, 0.4mol.

[0044] The preparation method is the same as in Example 1.

[0045] Prepared curing agent product index:

[0046] Appearance: Colorless transparent particles, the hydroxyl value is 212mgKOH / g, and the softening point is 115°C.

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Abstract

The invention relates to a curing agent for a pure polyester powder coating system and a preparation method thereof. The curing agent is prepared by polymerizing dimethyl adipate, 1,3,5-cyclohexanetricarboxylic acid, cis-hexahydrophthalic acid, diethanol amine, tetrafluoro-butanediol, tri-isopropanolamine, 1,1-cyclohexanedimethanol and pentaerythritol. The final curing agent is colorless transparent particles with a hydroxyl value of 200-250 mgKOH / g and a softening point of 110-125 DEG C; the curing agent can be subjected to cross-linked curing with powder coating pure polyester resin, whereinthe curing speed is relatively moderate, and a film with perfect levelling property can be obtained; pinholes rarely appear when the curing agent is applied to the coating of a 130 mu m thick film. Meanwhile, due to the introduction of a fluorine-containing material, tetrafluoro-butanediol, the outdoor weather resistance of the film is enhanced.

Description

technical field [0001] The invention belongs to the field of chemical powder coatings, and in particular relates to a curing agent for a pure polyester powder system and a preparation method thereof. More specifically, the invention relates to a curing agent with good compatibility with pure polyester resin, moderate curing speed, high leveling and good weather resistance and a preparation method thereof. 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 powder coating that forms a special-purpose coating film after heating. It has the characteristics of no VOC, environmental protection, energy saving, high construction efficiency and wide application range. [0003] S...

Claims

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Application Information

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IPC IPC(8): C09D7/65C09D7/63C09D7/61C09D7/48C09D5/03C09D167/00C08G63/685C08G63/85
CPCC08G63/6854C08G63/85C08K2003/2241C08K2003/3045C08L2205/025C09D5/033C09D167/00C08L67/00C08K13/02C08K3/22C08K5/07C08K3/30C08K5/375
Inventor 江建明胡泽湘程明光王永垒
Owner 安徽徽州正杰科技有限公司
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