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Low-acid-value polyester resin for ultralow-temperature curing powder coating and preparation method thereof

A polyester resin and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of high acid value, low activity of powder coatings, high preparation costs, etc., to overcome coating defects and reduce formulation costs , Accelerate the effect of promotion and application

Active Publication Date: 2021-10-01
安徽永利新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, its preparation cost is high, and the price of PT910 curing agent is about 10,000 / ton more expensive than TGIC. The bigger problem is its high epoxy equivalent, which is about 155g / mol (TGIC epoxy equivalent is 105g / mol)
Therefore, in the preparation of powder coatings, if the carboxylated polyester resin of the current TGIC system is used, due to the high acid value of the polyester resin (generally 30-35mgKOH / g), the amount of PT910 curing agent that matches the polyester resin To achieve about 1.5 times of TGIC, the formula cost of the final powder coating is too high to be applied, and because the compatibility between the polyester resin and the PT910 curing agent is not enough, although the curing can be achieved, the appearance of the cured coating film and Poor gloss
[0005] At present, there is a lack of low-acid-value polyester resins that match the PT910 curing agent system in China. In order to reduce the amount of PT910 curing agent, reducing the acid value of polyester alone will lead to low activity of powder coatings, which will not be able to achieve effective curing. Performance does not meet application requirements

Method used

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  • Low-acid-value polyester resin for ultralow-temperature curing powder coating and preparation method thereof
  • Low-acid-value polyester resin for ultralow-temperature curing powder coating and preparation method thereof
  • Low-acid-value polyester resin for ultralow-temperature curing powder coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This embodiment provides a method for preparing a low-acid value polyester resin for ultra-low temperature curing powder coatings, which also includes the following steps:

[0035] (1) Add 10 molar parts of triethylene glycol and 4 molar parts of glycerin into the reaction kettle, and stir and mix evenly below 120°C; then add 13 molar parts of terephthalic acid in an amount of 0.12 % of the catalyst monobutyltin oxide, under the protection of nitrogen, the temperature is raised to 184°C at a heating rate of 17°C / h and kept warm for reaction;

[0036] (2) When the acid value of the reactants in the system is reduced to 61mgKOH / g, 5 molar parts of sebacic acid and 15 molar parts of triisopropanolamine are added at the same time, and the temperature is raised to 232 °C at a heating rate of 7 °C / h to continue Insulation for polymerization;

[0037] (3) When the acid value of the reactants in the system is reduced to 21mgKOH / g, add 9 molar parts of isophthalic acid, and con...

Embodiment 2

[0043] This embodiment provides a method for preparing a low-acid value polyester resin for ultra-low temperature curing powder coatings, which also includes the following steps:

[0044] (1) Add 7 molar parts of triethylene glycol and 5 molar parts of glycerin into the reaction kettle, and stir and mix evenly below 120°C; then add 15 molar parts of terephthalic acid in an amount of 0.18% of the total molar weight of raw materials % of the catalyst monobutyltin oxide, under the protection of nitrogen, the temperature is raised to 182°C at a heating rate of 16°C / h and kept for reaction;

[0045] (2) When the acid value of the reactants in the system is reduced to 63mgKOH / g, add 6 moles of sebacic acid and 14 moles of triisopropanolamine at the same time, and heat up to 234°C at a rate of 8°C / h to continue Insulation for polymerization;

[0046] (3) When the acid value of the system reactant is reduced to 22 mgKOH / g, add 8 molar parts of isophthalic acid, and continue to carry ...

Embodiment 3

[0052] This embodiment provides a method for preparing a low-acid value polyester resin for ultra-low temperature curing powder coatings, which also includes the following steps:

[0053] (1) Add 9 molar parts of triethylene glycol and 3 molar parts of glycerin into the reaction kettle, and stir and mix evenly below 120°C; then add 17 molar parts of terephthalic acid in an amount of 0.2 % of the catalyst monobutyltin oxide, under the protection of nitrogen, the temperature is raised to 182°C at a heating rate of 18°C / h and kept for reaction;

[0054] (2) When the acid value of the reactants in the system is reduced to 64mgKOH / g, add 5 molar parts of sebacic acid and 12 molar parts of triisopropanolamine at the same time, and heat up to 233 °C at a heating rate of 6 °C / h to continue Insulation for polymerization;

[0055] (3) When the acid value of the system reactant is reduced to 21mgKOH / g, add 8 molar parts of isophthalic acid, and continue to carry out the chain extension ...

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Abstract

The invention provides a low-acid-value polyester resin for the ultralow-temperature curing powder coating and a preparation method. A flexible chain segment raw material triethylene glycol is matched with liquid polyfunctional raw materials glycerol and triisopropanolamine to serve as main raw materials, the main raw materials, terephthalic acid and sebacic acid are subjected to a chain extension reaction, finally, high-activity polyisobutylene succinic anhydride is used for blocking, the end-capped chain segment of the finally obtained polyester resin exists in the form of partial acid anhydride, and although the acid value is low, the activity of the acid anhydride is extremely high. The acid value of the obtained polyester resin is controlled to be 16-20 mgKOH / g, the softening point is 87-95 DEG C, ultralow-temperature curing can be achieved under the curing condition of 135 DEG C / 20 min, and the coating performance completely meets the requirements of a universal TGIC coating.

Description

technical field [0001] The invention belongs to the field of powder coatings, and in particular relates to a low-acid-value polyester resin for ultra-low temperature curing powder coatings and a preparation method thereof. Background technique [0002] At present, the weather-resistant powder coating is mainly triglycidyl isocyanurate (TGIC) curing type. Although the coating performance of the TGIC curing system is excellent, its potential sensitization has led to the suspension of use in the European Union. [0003] In response to this problem, the industry has also developed products that can replace the TGIC curing system. The more mature product is the PT910 curing agent product developed by Huntsman Corporation of the United States, which is mainly triglycidyl trimesate and p-benzene The mixture of diglycidyl diformate is completely comparable to TGIC in performance. [0004] But its preparation cost is high, and the price of PT910 curing agent is about 10,000 / ton mor...

Claims

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Application Information

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IPC IPC(8): C08G63/685C08G63/668C08G63/91C09D167/00C09D5/03
CPCC08G63/6854C08G63/668C08G63/914C09D167/00C09D5/03
Inventor 余利军余洪涛吴云凤
Owner 安徽永利新材料科技有限公司
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