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Bifunctional polyester resin for super-weather-resistant heat transfer printing powder coating and preparation method thereof

A technology of powder coating and polyester resin, which is applied in the direction of powder coating, polyester coating, coating, etc., which can solve the problems of high weather resistance, high acid value and other coating requirements, and achieve good heat transfer printing Effect of performance and/or leveling, reduced dosage, improved weatherability

Inactive Publication Date: 2020-05-01
帝兴树脂(昆山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the currently known weather-resistant polyester resin powder coatings have certain weather resistance, their weather resistance still cannot meet the coating requirements of outdoor high weather resistance
Moreover, existing weather-resistant polyester resins are usually carboxyl-terminated polyesters, which have a higher acid value

Method used

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  • Bifunctional polyester resin for super-weather-resistant heat transfer printing powder coating and preparation method thereof
  • Bifunctional polyester resin for super-weather-resistant heat transfer printing powder coating and preparation method thereof
  • Bifunctional polyester resin for super-weather-resistant heat transfer printing powder coating and preparation method thereof

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preparation example Construction

[0033] Preparation method of bifunctional polyester resin

[0034] The difunctional polyester resins described above can be prepared by a variety of methods. For example, a kind of exemplary preparation method comprises the following steps: polyhydric alcohol, polybasic acid, branching agent, and optional esterification catalyst are mixed and heated to carry out esterification polycondensation reaction; Then control reaction system at given temperature In case of adding an acidolysis agent or an alcoholysis agent, carry out further esterification reaction; control the acid value within a given range, then vacuum polycondensation until a resin product within the predetermined acid value and hydroxyl value range is obtained; optionally, Add additives such as antioxidants.

[0035] Therefore, another aspect of the present invention also relates to a method for preparing the difunctional polyester resin according to the present invention, comprising:

[0036] The following rea...

Embodiment 1-2 and comparative example A-C

[0099] Examples 1-2 and Comparative Examples A-C: Powder Coating Compositions

[0100] Prepare powder coatings by following steps:

[0101] 1. Premix all the raw materials polyester, curing agent, leveling agent, pigment and defoamer used in the manufacture of powder coatings in the premixer;

[0102] 2. Melt and extrude the pre-mixed raw materials through the extruder;

[0103] 3. Cool and press the molten extruded material into tablets;

[0104] 4. The flakes are pulverized by a pulverizer and sieved to obtain powder particles with a suitable particle size, which is the powder coating.

[0105] Respectively use Resin 1, Resin 2, Comparative Resin 1, Comparative Resin 2 and Comparative Resin 3 (1:1 mixture of Comparative Resin 1 and Comparative Resin 2) as raw material polyester to prepare powder coatings and measure the properties of the coating .

[0106]

[0107] It can be seen from the above results that the coating composition formulated with the bifunctional po...

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Abstract

The invention discloses a bifunctional polyester resin for a super-weather-resistant heat transfer printing powder coating and a preparation method thereof. The bifunctional polyester resin has an acid value of at least 10 and less than 28 mg KOH / g polyester and a hydroxyl value of 10 to 40 mg KOH / g polyester, and at least 88 mol% of the polyacid structural units in the bifunctional polyester resin are derived from isophthalic acid. The invention also relates to a super-weather-resistant heat transfer powder coating comprising the bifunctional polyester resin and a coated article.

Description

technical field [0001] The invention relates to a bifunctional polyester resin for super weather-resistant thermal transfer powder coating and a preparation method thereof. The present invention also relates to coating compositions and coated articles comprising the difunctional polyester resins of the present invention. Background technique [0002] In recent years, weather-resistant powder coatings have become more and more popular in the market. At present, the weather-resistant powder coatings applied to metal materials are mainly polyester and polyurethane powder coatings. Although the currently known weather-resistant polyester resin powder coatings have certain weather resistance, their weather resistance still cannot meet the coating requirements of outdoor high weather resistance. Moreover, the existing weather-resistant polyester resins are usually carboxyl-terminated polyesters, which have a relatively high acid value. [0003] With the development of society, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/78C08G63/85C09D167/02C09D5/03C09D7/61
CPCC08G63/20C08G63/78C08G63/85C08K2003/2241C08K2003/3045C09D5/03C09D167/02C08K13/02C08K3/22C08K3/30
Inventor 杜娟黄汝彬
Owner 帝兴树脂(昆山)有限公司
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