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Polyester resin and synthesis method thereof

A technology of polyester resin and synthesis method, which is applied in the direction of polyester paint, coating, powder coating, etc., can solve the problems of immature products and difficult control of synthesis process, and achieve a good matting effect

Inactive Publication Date: 2013-12-25
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the synthesis of high hydroxyl value polyester resin is also a breakthrough point in this field. Due to the high hydroxyl value, there must be a suitable alkyd equivalent, but this is a contradiction with the maintenance of the glass transition temperature of the resin.
And the synthesis process is difficult to control, so there are very few synthetic materials about high-hydroxyl value polyester, and the products are not very mature.

Method used

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  • Polyester resin and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of polyester resin, its raw material component and mass proportion are shown in Table 1;

[0019] A kind of synthetic method of polyester resin, uses the method synthetic of melt polycondensation, and step comprises:

[0020] A. Put dihydric alcohol and branching agent into 25L reactor according to the ratio, and heat until the material melts;

[0021] B. Stir, add the proportioning amount of aromatic dibasic acid and esterification catalyst at the same time, slowly raise the temperature to 235°C to maintain the acid value of 21mgKOH / g, then cool down to 200°C and continue to maintain the target acid value and hydroxyl value to obtain polyester resin;

[0022] The target acid value is 0.8 mgKOH / g, and the hydroxyl value is 295 mgKOH / g.

Embodiment 2

[0024] A kind of polyester resin, its raw material component and mass proportion are shown in Table 1;

[0025] A kind of synthetic method of polyester resin, uses the method synthetic of melt polycondensation, and step comprises:

[0026] A. Put dihydric alcohol and branching agent into 25L reactor according to the ratio, and heat until the material melts;

[0027] B. Stir, add the proportioning amount of aromatic dibasic acid and esterification catalyst at the same time, slowly raise the temperature to 240°C to maintain the acid value of 18mgKOH / g, then cool down to 205°C and continue to maintain the target acid value and hydroxyl value to obtain polyester resin;

[0028] The target acid value is 0.9 mgKOH / g, and the hydroxyl value is 288 mgKOH / g.

Embodiment 3

[0030] A kind of polyester resin, its raw material component and mass proportion are shown in Table 1;

[0031] A kind of synthetic method of polyester resin, uses the method synthetic of melt polycondensation, and step comprises:

[0032] A. Put dihydric alcohol and branching agent into 25L reactor according to the ratio, and heat until the material melts;

[0033] B. Stir, add the proportioning amount of aromatic dibasic acid and esterification catalyst at the same time, slowly raise the temperature to 230°C to maintain the acid value of 23mgKOH / g, then cool down to 195°C and continue to maintain the target acid value and hydroxyl value to obtain polyester resin;

[0034] The target acid value is 1.0 mgKOH / g, and the hydroxyl value is 285 mgKOH / g.

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Abstract

The invention relates to polyester resin and a synthesis method thereof. The polyester resin comprises the following raw material components in parts by mass: 45-53 parts of aromatic binary acid, 40-50 parts of a branching agent, 0-10 parts of dihydric alcohol and 0-0.01 part of an esterification catalyst; the polyester resin is synthesized by melt phase polycondensation. The polyester resin has an ultrahigh hydroxyl value, has acceptable glass-transition temperature, can be used for preparing an AB dry-blending extinction powder coating and has a favorable extinction effect.

Description

technical field [0001] The invention relates to the technical field of synthesis of organic polymer materials, in particular to a polyester resin and a synthesis method thereof. Background technique [0002] Thermosetting powder coatings have developed rapidly in recent years and are widely used in various electronic products, household appliances, agricultural equipment, machinery industry, automobile industry and construction industry and other fields. Thermosetting powder coatings are tough, have good solvent and weather resistance, and have good adhesion to metal substrates. Compared with traditional organic solvent liquid coatings, thermosetting powder coatings have unique advantages: on the one hand, no harmful organic solvents are released, and on the other hand, the coatings can be used almost completely, so thermosetting powder coatings are both environmentally friendly and economical. [0003] Polyester resin is the most important component of powder coatings, and...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/85C09D167/02C09D5/03
Inventor 吴德清杨兆攀武振生
Owner ANHUI SHENJIAN NEW MATERIALS
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