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Trimellitic anhydride (TMA)-free mixed matting powder coating and preparation method thereof

A matting powder coating and mixed technology, applied in powder coatings, polyester coatings, epoxy resin coatings, etc., can solve the problems of unfavorable human health, polyester resin does not indicate whether it contains, etc., to achieve good matting effect, matting gloss Low, good mechanical properties

Inactive Publication Date: 2019-12-20
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patents CN107936236A and CN105254863B respectively report a polyester resin for hybrid matting powder coatings. Trimellitic anhydride is used as the raw material for the preparation of such polyester resins, and there is free TMA in the prepared powder coatings, which is harmful to human health.
The polyester resin used in the epoxy polyester powder coating reported by patent CN108727530A does not indicate whether it contains TMA

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A TMA-free mixed matting powder coating, its raw material components and parts by mass are shown in Table 1.

[0017] The preparation of TMA-free type polyester resin is as follows:

[0018] Put 1120 parts by mass of neopentyl glycol, 390 parts of liquid alcohol, and 30 parts of trimethylolpropane into the reactor, heat to 110°C to melt, start stirring, then add 2590 parts of terephthalic acid, 4 parts of esterification Catalyst, heat up to 247°C to maintain the reaction until the reactant is clear, take a sample, test the acid value, then cool down to 220°C, put in 260 parts of end-capping agent, maintain until the reactant is clear, take a sample, test the acid value, then vacuum for 3 hours, and finally put in 12 Parts of curing accelerator and 35 parts of antioxidant, the acid value of the sample obtained after maintaining for 20min is 49.6mgKOH / g, and the viscosity is 2050mPa·s.

[0019] The preparation of TMA-free hybrid matting powder coatings is as follows:

...

Embodiment 2

[0022] A TMA-free mixed matting powder coating, its raw material components and parts by mass are shown in Table 1.

[0023] The preparation of TMA-free type polyester resin is as follows:

[0024] Put 1120 parts by mass of neopentyl glycol, 390 parts of liquid alcohol, and 30 parts of trimethylolpropane into the reactor, heat to 110°C to melt, start stirring, then add 2590 parts of terephthalic acid, 4 parts of esterification Catalyst, heat up to 247°C to maintain the reaction until the reactant is clear, take a sample, test the acid value, then cool down to 220°C, put in 260 parts of end-capping agent, maintain until the reactant is clear, take a sample, test the acid value, then vacuum for 3 hours, and finally put in 12 Parts of curing accelerator and 35 parts of antioxidant, the acid value of the sample obtained after maintaining for 20min is 49.6mgKOH / g, and the viscosity is 2050mPa·s.

[0025] The preparation of TMA-free hybrid matting powder coatings is as follows:

...

Embodiment 3

[0028] A TMA-free mixed matting powder coating, its raw material components and parts by mass are shown in Table 1.

[0029] The preparation of TMA-free type polyester resin is as follows:

[0030] Put 1120 parts by mass of neopentyl glycol, 390 parts of liquid alcohol, and 30 parts of trimethylolpropane into the reactor, heat to 110°C to melt, start stirring, then add 2590 parts of terephthalic acid, 4 parts of esterification Catalyst, heat up to 247°C to maintain the reaction until the reactant is clear, take a sample, test the acid value, then cool down to 220°C, put in 260 parts of end-capping agent, maintain until the reactant is clear, take a sample, test the acid value, then vacuum for 3 hours, and finally put in 12 Parts of curing accelerator and 35 parts of antioxidant, the acid value of the sample obtained after maintaining for 20min is 49.6mgKOH / g, and the viscosity is 2050mPa·s.

[0031] The preparation of TMA-free hybrid matting powder coatings is as follows:

...

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Abstract

The invention aims to provide a trimellitic anhydride (TMA)-free mixed matting powder coating and a preparation method thereof. Raw materials of the coating are TMA-free polyester resin, epoxy resin,titanium dioxide, an inorganic filler, a flatting agent, benzoin, a wetting accelerator and a matting agent. The raw materials are mixed according to a mass part ratio, and then extruding, crushing and sieving are carried out to prepare the TMA-free powder coating. The raw materials used in the preparation process do not contain TMA and are environmentally friendly and pollution free. A coating layer has the advantages of good mechanical property, excellent leveling, fine and smooth surface and good extinction effect. The surface of the cured coating layer is fine and smooth and has low matting gloss, and has good adhesion, impact and bending properties.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a TMA-free hybrid matting powder coating and a preparation method thereof. Background technique [0002] There are many types of matting powder coatings, and polyester / epoxy matting powder coatings have a better matting effect. Most of the polyester resins in this type of matting coatings will use trimellitic anhydride (TMA) as a synthetic raw material. TMA has high reactivity. In the synthesis of polyester resin, a part participates in the alkyd polycondensation reaction, and a part exists in the polyester resin in a free form. After being prepared into a powder coating, the difference in reactivity can be used to achieve good matting effect. For TMA-free polyester, the matting ability is generally insufficient, and the powder coating has poor leveling and mechanical properties, and the board surface is not fine enough. [0003] Although TMA has a good matting abi...

Claims

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Application Information

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IPC IPC(8): C09D167/02C09D163/00C09D7/61C09D5/03C08G63/78C08G63/672C08G63/183
CPCC08G63/183C08G63/672C08G63/78C08K2003/2241C09D5/033C09D167/02C08L63/00C08K3/22
Inventor 翟春海
Owner ANHUI SHENJIAN NEW MATERIALS
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