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Semi-crystalline polyester resin and powder coating

A polyester resin, semi-crystalline technology, applied in the field of polyester resin and coatings containing polyester resin, can solve problems such as environmental and human health impacts, achieve excellent leveling performance, low curing temperature, improve impact resistance and and the effect of smoothness

Pending Publication Date: 2021-08-03
黄山佳杰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

Although low-temperature curing at 160°C can be achieved by adding a curing accelerator, since the curing system is triglycidyl isocyanurate (TGIC for short), it has a great impact on the environment and human health.

Method used

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  • Semi-crystalline polyester resin and powder coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 25 parts by mass of diethylene glycol, 300 parts by mass of NPG, 34 parts by mass of 1,6-hexanediol, 32 parts by mass of TMP, and 19 parts by mass of isosorbide into the reaction kettle, heat to 60°C until partially melted, and then add 540 parts by mass of PTA, 52 parts by mass of IPA, 13 parts by mass of adipic acid, 13 parts by mass of 1,4-cyclohexanedioic acid, 1.5 parts by mass of esterification catalyst, 1 part by mass of antioxidant, feed nitrogen, and continue to heat up Reaction, heat preservation at 240°C for 5 hours.

[0033] Take the sample in the kettle to test the acid value, adjust and add 160 parts by mass of acid decapping agent dodecanedioic acid according to the acid value data, and continue the reaction for 2 hours.

[0034] Take the sample in the kettle to test the acid value, vacuumize for 5 hours, measure the acid value and viscosity, cool down to 185°C, discharge the material into slices, and pack to obtain the finished product.

Embodiment 2

[0036] Add 14 parts by mass of diethylene glycol, 348 parts by mass of NPG, 8 parts by mass of 1,4-butanediol, 12 parts by mass of 1,6-hexanediol, 12 parts by mass of TMP, and 5 parts by mass of isosorbide in the reaction kettle parts, heated to 60°C until partially melted, then added 556 parts by mass of PTA, 57 parts by mass of IPA, 12 parts by mass of sebacic acid, 8 parts by mass of 1,4-cyclohexanedioic acid and 1.5 parts by mass of esterification catalyst, antioxidant 1 part by mass of the agent, nitrogen gas was introduced, and the temperature was continuously raised to react, and the temperature was kept at 240° C. for 5 hours.

[0037] Take the sample in the kettle to detect the acid value, adjust and add 128 parts by mass of acid decapping agent dodecanedioic acid according to the acid value data, and continue to react for 2 hours.

[0038] Take the sample in the kettle to test the acid value, vacuumize for 5 hours, measure the acid value and viscosity, cool down to 185...

Embodiment 3

[0040] 288 parts by mass of NPG, 6 parts by mass of 1,4-butanediol, 12 parts by mass of cyclohexanedimethanol, 10 parts by mass of TMP, 16 parts by mass of dodecanediol, and 12 parts by mass of isosorbide were sequentially added to the reaction kettle , heated to 60°C until partially melted, then added 580 parts by mass of PTA, 50 parts by mass of IPA, 10 parts by mass of sebacic acid, 10 parts by mass of 1,4-cyclohexanedioic acid and 1.5 parts by mass of esterification catalyst, antioxidant 1 part by mass of the agent, nitrogen gas was introduced, and the temperature was continuously raised to react, and the temperature was kept at 240° C. for 5 hours.

[0041] Take the sample in the kettle to test the acid value, adjust and add 130 parts by mass of acid decapping agent dodecanedioic acid according to the acid value data, and continue to react for 2 hours.

[0042] Take the sample in the kettle to test the acid value, vacuumize for 5 hours, measure the acid value and viscosit...

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Abstract

The invention relates to a semi-crystalline polyester resin and a powder coating. The crystallinity of the semi-crystalline polyester resin is 10%-45%, the polymerization degree is 1.95-2.05, and the number-average molecular weight is 3000-5000. The semi-crystalline polyester resin has excellent leveling performance and mechanical performance, is low in curing temperature, and can be well matched with the characteristics of an HAA curing system, so that the impact resistance and smoothness of the HAA curing system powder coating after film forming are remarkably improved.

Description

technical field [0001] The invention relates to polyester resins and coatings containing polyester resins, in particular to semi-crystalline polyester resins and powder coatings. Background technique [0002] Powder coating usually has a high curing temperature (180-200°C), which can no longer meet the new development requirements, and also consumes a lot of heat. Low-temperature curing powder coatings have become an effective development direction for reducing energy consumption in the coatings industry. [0003] The semi-crystalline polyester resin has a high glass transition temperature and low viscosity, which overcomes the problems of poor storage stability of traditional amorphous polyester resins and poor surface leveling of powder coatings. However, when semi-crystalline polyester resin is used in matting powder coatings, the curing temperature is relatively high, generally 200°C, and the lowest can only reach 170°C / 15min (Chinese patent CN111234185A). Although low...

Claims

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Application Information

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IPC IPC(8): C08G63/672C09D167/02C09D5/03
CPCC08G63/672C09D167/02C09D5/03
Inventor 俞介兵许俊杰曹汪洋
Owner 黄山佳杰新材料科技有限公司