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Polyester resin capable of rapidly cured at low temperature and preparation method thereof

A polyester resin, curing technology, used in polyester coatings, coatings, powder coatings, etc., can solve the problems of high reactivity, poor coating flatness, high melt viscosity, etc., and achieve the effect of improving reactivity

Inactive Publication Date: 2019-03-22
ANHUI HENGMING MOLD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing powder coating system mainly has the following problems when it is used for low-temperature curing. On the one hand, the system has insufficient reactivity, the powder coating cannot be completely cured, and the coating performance is not ideal; on the other hand, the flatness of the coating is poor, which is mainly Due to the reactivity required for low temperature curing, polyester resins often have high melt viscosity, high reactivity, and insufficient leveling at low temperatures
These have greatly affected the decorative properties of powder coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of rapid low-temperature curing type polyester resin, comprises following raw materials in parts by weight:

[0033] 7.5 parts of polyol, 13.8 parts of acid, 0.018 part of monobutyltin oxide, 0.1 part of tetraethylammonium bromide, 0.15 part of isopropyltriphenylphosphonium bromide;

[0034] The polyol is neopentyl glycol, 2-butyl-2-ethyl-1,3-propanediol and trimethylolpropane in a mass ratio of 2:2.5:3.

[0035] The acid is selected from terephthalic acid, isophthalic acid, 1,4-cycloethanedicarboxylic acid and fumaric acid, and the mass ratio is: 5:3:2:3.8.

[0036] The preparation method of above-mentioned rapid low-temperature curing type polyester resin comprises the following steps:

[0037] 1) The first stage: Put the formula amount of alcohol into the reaction kettle, add the formula amount of terephthalic acid, isophthalic acid and monobutyltin oxide under the condition of stirring, seal the kettle and heat the reaction temperature to 175 ° C, and then ...

Embodiment 2

[0042] A kind of rapid low-temperature curing type polyester resin, comprises following raw materials in parts by weight:

[0043] 8.8 parts of polyol, 14.5 parts of acid, 0.025 part of esterification catalyst, 0.12 part of tetraethylammonium bromide and 0.18 part of ethyltriphenylphosphonium bromide;

[0044] The polyol is neopentyl glycol, 2-butyl-2-ethyl-1,3-propanediol and trimethylolpropane in a mass ratio of 1.5:2.5:3.

[0045] The acid is selected from terephthalic acid, isophthalic acid, 1,4-cycloethanedicarboxylic acid, fumaric acid and trimellitic anhydride, and the mass ratio is 5:3:2:1.5:3.

[0046] The preparation method of above-mentioned rapid low-temperature curing type polyester resin comprises the following steps:

[0047] 1) The first stage: Put the formula amount of alcohol into the reaction kettle, add the formula amount of terephthalic acid, isophthalic acid and monobutyltin oxide under the condition of stirring, seal the kettle and heat the reaction tem...

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Abstract

The invention provides polyester resin capable of rapidly cured at low temperature and a preparation method thereof. The polyester resin is prepared from the following raw materials in parts by weight: 6.5-9.5 parts of polyalcohol, 13.5-14.5 parts of acid, 0.015-0.025 part of an esterification catalyst and 0.2-0.3 part of a curing accelerant. Compared with the prior art, according to the polyesterresin capable of rapidly cured at low temperature, high-activity monomers are combined, so that the finally prepared polyester resin is high in activity; softening point of the polyester resin is slightly reduced; a powder paint prepared by the polyester resin can be fully cured in short time under the low-temperature condition; the energy consumption is greatly reduced; in addition, good low-temperature leveling property and storage stability of the powder paint can also be ensured; meanwhile, the powder paint has excellent curing property and film formation property.

Description

technical field [0001] The invention belongs to the field of polyester resin preparation, and in particular relates to a rapid low-temperature curing polyester resin and a preparation method thereof. Background technique [0002] With the strengthening of energy saving and environmental protection concepts, it is a development trend to develop low-temperature curing polyester resins; in addition, some heat-sensitive substrates are sensitive to temperature and require low-temperature curing. Reducing the curing temperature will inevitably require the resin to have high reactivity, and high reactivity will have a certain impact on the coating performance. The existing powder coating system mainly has the following problems when it is used for low-temperature curing. On the one hand, the system has insufficient reactivity, the powder coating cannot be completely cured, and the coating performance is not ideal; on the other hand, the flatness of the coating is poor, which is mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/52C09D167/06C09D5/03
CPCC08G63/52C09D5/03C09D167/06
Inventor 昝向明杨为华刘杰
Owner ANHUI HENGMING MOLD TECH
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