Mixed polyester resin for matte powder coatings and preparation thereof

A polyester resin and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as the use of low-gloss powder coatings, the decline in the impact performance of coatings, and the high cost of polyester resins, and achieve low cost, The effect of excellent mechanical properties and simplified feeding method

Inactive Publication Date: 2008-06-25
GUANGZHOU QINGTIAN INDAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they are not used for low-gloss powder coatings, and most of the current patents use solid neopentyl glycol with high cost as synthetic raw materials. The cost of the obtained polyester resin is relatively high, which is not conducive to meeting different market needs.
In addition, when the polyester resin synthesized by solid neopentyl glycol is used to prepare powder coatings, more physical matting agents need to be added to achieve a better matting effect, and the matting effect is limited. , the impact performance of the coating will also decrease

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0016] The following examples are only used to illustrate the present invention, and the protection scope of the present invention is not limited to the following examples. Those of ordinary skill in the technical field can realize the object of the present invention according to the content disclosed in the present invention above.

[0017] In Table 1, A~G are examples without solid neopentyl glycol, and D is a comparative example with solid neopentyl glycol. In a 50-liter reactor, add 1,4-cyclohexanedimethanol, 2-methyl-1,3-propanediol, ethylene glycol, 1,3-propanediol, trimethylol in the ratio listed in Table 1 Propane and neopentyl glycol are heated until the material is melted; then terephthalic acid, isophthalic acid, adipic acid, dibutyltin oxide, and monobutyltin oxide are added successively, and the temperature is raised to 180 ℃, esterified water starts to be formed and distilled out, and then the temperature is gradually raised to 250 ℃, and the total reaction is 5...

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PUM

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Abstract

The invention discloses a mixed polyester resin for matte powder coating, which is obtained through the melting polycondensation by using the components with the following weight fraction: 23 percent to 50 percent of polyol, 35 percent to 65 percent of aromatic polybasic acid, 0 percent to 10 percent of fat polybasic acid, 0 percent to 2 percent of branching agent, 10 percent to 20 percent of acidulate agent and 0.01 percent to 0.15 percent of esterification catalyst. The invention also discloses a preparation method for a mixed polyester resin for matte powder coating. The polyester resin prepared through the method of the invention has the advantages of proper glass transition temperature,softening temperature, good storage stability, low cost, etc., and the matte powder coating with a gloss lower than 30 percent can be obtained by mixing the polyester resin with a certain proportion of the epoxy resin,stuffing, paint, flatting agent and matting agent and then melting, extruding, grinding and cribrating the mixtures and the obtained polyester resin has an outstanding mechanical performance and flatting effect.

Description

technical field [0001] The invention relates to a hybrid polyester resin for low-gloss powder coatings, and also relates to a preparation method of the hybrid polyester resin for low-gloss powder coatings. Background technique [0002] With its advantages of economy, environmental protection, high efficiency and excellent performance, powder coatings are gradually replacing organic solvent-based coatings, becoming an important development direction in the coatings industry, and have maintained a relatively fast growth rate. Mainly used in household appliances, garden metal furniture, hardware components, auto parts, outdoor fences and other fields. Polyester thermosetting powder coatings can be divided into pure polyester type and mixed type according to different curing systems, among which the mixed type is the most widely used. The pure polyester type mainly includes the polyester-TGIC system and the polyester-PRIMID system, which are mostly used outdoors; the mixed type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/85C09D167/03C09D5/03
Inventor 何涛顾宇昕张捷刘亮王亮李勇周年忠
Owner GUANGZHOU QINGTIAN INDAL
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