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Preparation method of polyester resin master batch for regulating and controlling solidification speed of powdery coating, and application of polyester resin master batch

A polyester resin, curing speed technology, used in powder coatings, polyester coatings, coatings and other directions, can solve the problems of coating surface defects, gel particles, difficult to disperse well, etc., to improve efficiency, Energy saving, simple and reasonable preparation

Inactive Publication Date: 2013-11-20
浙江中法新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the amount of accelerator added is generally very small, it is difficult to disperse well when added in the powder making process. If the local concentration is too large, gel particles will easily be generated, and eventually defects will be formed on the surface of the coating; in synthetic resins Adding, because the viscosity of the resin is relatively small at this time, the accelerator is easy to disperse evenly, but the polyester resin with a fixed amount of curing accelerator is not suitable for all powder coating manufacturers.

Method used

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  • Preparation method of polyester resin master batch for regulating and controlling solidification speed of powdery coating, and application of polyester resin master batch
  • Preparation method of polyester resin master batch for regulating and controlling solidification speed of powdery coating, and application of polyester resin master batch
  • Preparation method of polyester resin master batch for regulating and controlling solidification speed of powdery coating, and application of polyester resin master batch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In the synthesis reaction vessel, put 160g of 2-methyl-1,3-propanediol, 210g of neopentyl glycol, 5g of trimethylolpropane, heat to melt and the temperature does not exceed 120°C; then add 540g of Terephthalic acid and 0.8g of monobutyltin oxide, while passing nitrogen gas for reaction protection; gradually heat the material to react, the temperature does not exceed 240 ° C, and maintain the temperature to continue the reaction until there is no more distillate So far, the acid value is 6-10mgKOH / g; then lower the temperature to below 220°C, add 5g of adipic acid and 130g of isophthalic acid to react, and then gradually increase the temperature without exceeding 240°C until the acid value is 43-48mgKOH / g , then vacuumize (-0.085~-0.1MPa) until the acid value is 32-40mgKOH / g; finally cool down to below 230°C, add 40g triphenylethylphosphine bromide and 30g18~16 alkyl tertiary amine, and stir for 30min After discharging, the polyester resin masterbatch A is obtained.

[...

Embodiment 2

[0044] In the synthesis reaction vessel, put 145g of 2-methyl-1,3-propanediol, 235g of neopentyl glycol, and 7.5g of trimethylolpropane, heat to melt and the temperature does not exceed 120°C; then, under stirring, add 560g of terephthalic acid and 0.8g of monobutyltin oxide, while passing nitrogen gas for reaction protection; gradually heat the materials for reaction, the temperature does not exceed 240°C, and maintain the temperature to continue the reaction until there is no more lutetization until the acid value is 6-10mgKOH / g; then lower the temperature to below 220°C, add 135g of isophthalic acid to react, then gradually increase the temperature and not exceed 240°C until the acid value is 43-48mgKOH / g, and then vacuumize (-0.085~-0.1MPa) until the acid value is 32-40mgKOH / g; finally lower the temperature to below 230°C, add 70g of triphenylethylphosphine bromide, stir for 30min, and discharge to obtain polyester resin masterbatch B .

[0045] After testing, the acid va...

Embodiment 3

[0047] In the synthesis reaction vessel, put 130g of 2-methyl-1,3-propanediol, 255g of neopentyl glycol, and 8g of trimethylolpropane, heat to melt and the temperature does not exceed 120°C; then add 548g of Terephthalic acid and 0.8g of monobutyltin oxide, while passing nitrogen gas for reaction protection; gradually heat the material to react, the temperature does not exceed 240 ° C, and maintain the temperature to continue the reaction until there is no more distillate So far, the acid value is 6-10mgKOH / g; then lower the temperature to below 220°C, add 5g of adipic acid and 140g of isophthalic acid to react, and then gradually increase the temperature and not exceed 240°C until the acid value is 43-48mgKOH / g , then vacuumize (-0.085~-0.1MPa) until the acid value is 32-40mgKOH / g; finally cool down to below 230°C, add 70g of 18-16 alkyl tertiary amine, stir for 30min and discharge to obtain polyester resin master grain C.

[0048] After testing, the acid value of polyester ...

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Abstract

The invention relates to the powdery coating field and discloses a preparation method of a polyester resin master batch for regulating and controlling solidification speed of a powdery coating, and application of the polyester resin master batch to powdery coating. The method provided by the invention employs alcohol and acid in a molar ratio of 1.02-1.2 / 1 to prepare the linear polyester resin master batch; and an added curing accelerator accounts for 0.2-8 wt%. The polyester resin master batch prepared according to the method has an acid value of 30-50 mg KOH / g and high glass-transition temperature; and the curing accelerator quaternary phosphonium salt and (or) quaternary ammonium salt in the weight proportion of 0.2-8% is added, so as to prepare the polyester resin master batch for regulating and controlling solidification speed of the powdery coating. The method provided by the invention can effectively shorten solidification time or reduce solidification temperature of the powdery coating, thereby reducing energy consumption and expanding scope of application of the powdery coating.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to the preparation of a polyester resin masterbatch for regulating the curing speed of powder coatings and its application in powder coatings. Background technique [0002] Powder coatings are favored by people for their advantages of resource saving, energy saving, pollution-free, high efficiency and easy realization of automatic production. The output is increasing rapidly, and it has become one of the development directions of the coating industry. [0003] The curing temperature of general-purpose powder coatings is relatively high. The curing conditions of general powder coatings are mostly at a temperature of 180-200°C, and some are as high as 220°C, and the curing time is 15-30min. There are disadvantages of high baking temperature and long time. The product The production cycle is long and the production efficiency is low. From the perspective of saving energy, reducing costs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D167/02C09D7/12C09D5/03C08G63/20
Inventor 曹平董亿政程坚
Owner 浙江中法新材料有限公司
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