Polyester resin with excellent flexibility for power coating and preparation method thereof

A polyester resin and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as low softening point and poor coating flexibility, and achieve low softening point, soft chain segments, and easy process operation Effect

Active Publication Date: 2019-05-14
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

[0006] In view of the poor flexibility of the powder coating coating after curing of the N,N,N',N'-tetrakis(β-hydroxyethyl)adipamide (HAA) curing system in the prior art, in order to improve the polyester powder The flexibility, environmental protection and safety of coating, the object of the present invention is to provide a kind of polyester resin for powder coating with good flexibility and preparation method thereof, the raw material monomer linear structure that this method uses is better, and the obtained polyester resin The chain segment is soft, the softening point is low, and the process is stable

Method used

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  • Polyester resin with excellent flexibility for power coating and preparation method thereof
  • Polyester resin with excellent flexibility for power coating and preparation method thereof
  • Polyester resin with excellent flexibility for power coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of polyester resin for powder coating with good flexibility and preparation method thereof, its raw material composition and molar ratio are:

[0031]

[0032]

[0033] The method for preparing the above-mentioned polyester resin for powder coatings with excellent flexibility may further comprise the steps:

[0034] A. Add the terephthalic acid, dipropylene glycol, and catalyst in the formula amount into the reaction kettle, and heat the esterification reaction below 175°C for 2-4h;

[0035] B. Then add the formulated amount of 4-methoxyphthalic acid, neopentyl glycol and ethylene glycol salicylate to the mixed material prepared in the above steps, and gradually increase the temperature from 175°C to 200°C under nitrogen protection , the heating rate is controlled at 10°C / h, and the reaction is kept for 4-8h until no obvious distillate is distilled out, and the acid value of the reactant is less than 110mgKOH / g;

[0036] C. Then add adipic acid and 1,7-hep...

Embodiment 2

[0040] A kind of polyester resin for powder coating with good flexibility and preparation method thereof, its raw material composition and molar ratio are:

[0041]

[0042] Its preparation method etc. are the same as embodiment 1.

[0043] The acid value of the prepared polyester resin: 33 mgKOH / g, the softening point: 102°C.

Embodiment 3

[0045] A kind of polyester resin for powder coating with good flexibility and preparation method thereof, its raw material composition and molar ratio are:

[0046]

[0047]

[0048] Its preparation method etc. are the same as embodiment 1.

[0049] Acid value of the prepared polyester resin: 31 mgKOH / g, softening point: 100°C.

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Abstract

The invention relates to polyester resin with excellent flexibility for a power coating and a preparation method thereof and belongs to the technical field of powder coating chemical engineering. Rawmaterials used by the polyester resin are relatively good in monomer linear structure. By using high activity and high flexibility binary acid diglycollic acid as an end-capping reagent, a coating board with excellent flexibility is obtained while guaranteeing the comprehensive performance of the final power coating: impact resistance and water decoction resistance. The prepared polyester resin main body is good in linear structure, relatively low in softening point and excellent in flexibility and bending resistance, and can be matched with a high degree-of-functionality curing agent N,N,N',N'-tetra(beta-ethoxy) adipamide curing system. The decorative performance and the protecting performance of the power coating are improved, and the polyester resin is particularly remarkable in flexibility, and the highest T bending value reaches up to 1T. The preparation method is easily available in raw material, simple in process operation and suitable for scaled production and is widely appliedto the field of decoration and protection of home appliances, automobiles, metal furniture and the like.

Description

technical field [0001] The invention relates to a polyester resin for powder coatings with excellent flexibility and a preparation method thereof. The prepared polyester resin can be combined with a high-functionality curing agent N,N,N',N'-tetrakis(β-hydroxyethyl ) adipamide (HAA) curing system to prepare a powder coating with excellent flexibility, which belongs to the technical field of powder coating chemical industry. Background technique [0002] Unlike traditional solvent-based coatings, powder coatings are solid powders that contain neither organic solvents (VOCs) nor water, and are widely used in home appliances, automobiles, office appliances, steel and construction. Powder coatings are gradually replacing traditional solvent-based coatings due to their advantages of high inorganic content, no pollution and energy saving. With the advancement of science and technology and the development of the market, the application of powder coatings has attracted more and more...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/91C08G63/78C09D167/02C09D5/03C09D7/63
Inventor 余利军余洪涛朱学刚
Owner 安徽永利新材料科技有限公司
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