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A kind of polyester resin for powder coating with low volatile content and preparation method thereof

A technology for powder coatings and polyester resins, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as low volatile content, and achieve low volatile content, improved utilization, and appropriate glass transition temperature. Effect

Active Publication Date: 2017-10-31
广东伊诗德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

[0005] However, there are few studies on polyester resins for powder coatings with low volatile content and only a small amount or no fouling when the powder coatings are baked and cured.

Method used

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  • A kind of polyester resin for powder coating with low volatile content and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: the synthesis of polyester resin A

[0038] Put 23.63kg of neopentyl glycol, 10.77kg of 1,4-cyclohexanedimethanol, and 11.97kg of 2-butyl-2-ethyl-1,3-propanediol into the reaction kettle, heat to 110°C, and wait until the alcohol is completely melted Finally, blow nitrogen, turn on the stirring, put in 57.95kg of terephthalic acid, 89.2g of monobutyltin oxide, and start to generate esterified water when the temperature is raised to 190°C, control the distillation temperature to 99°C, gradually raise the temperature to 250°C, and keep warm until the reaction The liquid was clear, the acid value was 18.4mg KOH / g and the viscosity was 1100cP / 200°C as measured by sampling.

[0039] Adjust the reaction temperature to 245°C, add 5.21 kg of isophthalic acid, 3.75 kg of 1,4-cyclohexanedicarboxylic acid, and 1.72 kg of 1,6-hexanedioic acid, and keep the reaction liquid until it is clear, and the acid value is 43.1 by sampling mg KOH / g, the viscosity is 1240cP / 200℃...

Embodiment 2

[0042] Embodiment 2: the synthesis of polyester resin B

[0043]Put 36.98kg of neopentyl glycol and 1.96kg of trimethylolpropane into the reactor, heat it to 130°C, after the alcohol is completely melted, blow nitrogen, turn on the stirring, put in 26.05kg of terephthalic acid, 27.36kg of isophthalic acid Formic acid, 157g of monobutyl dihydroxytin chloride, heated up to 170°C, controlled distillation temperature to 96-104°C, gradually heated up to 240°C, kept warm until the reaction solution was clear, and the acid value was 9.1mg KOH / g measured by sampling, The viscosity is 875cP / 200°C.

[0044] Adjust the reaction temperature to 230°C, add 7.81kg of isophthalic acid and 3.44kg of 1,6-adipic acid, and keep it until the reaction liquid is clear. The acid value is 42.0mg KOH / g and the viscosity is 970cP / 200°C. .

[0045] Adjust the reaction temperature to 240°C, and put in 209g of tris(2,4-di-tert-butylphenyl)phosphite and 418g of beta-(3,5-di-tert-butyl-4-hydroxyphenyl)octa...

Embodiment 3

[0047] Embodiment 3: the synthesis of polyester resin C

[0048] Put 31.42kg of neopentyl glycol, 10.77kg of 1,4-cyclohexanedimethanol into the reaction kettle, heat to 120°C, after the alcohol is completely melted, blow nitrogen, turn on the stirring, put in 31.26kg of terephthalic acid, 27kg 1,4-Cyclohexanedicarboxylic acid, 0.1kg stannous oxalate, heat up to 170°C, control the distillation temperature to 96-104°C, gradually raise the temperature to 245°C, keep warm until the reaction solution is clear, the acid value is 13.7mg measured by sampling KOH / g, the viscosity is 875cP / 200℃.

[0049] Adjust the reaction temperature to 235°C, add 6.75kg of isophthalic acid and 1.15kg of 1,6-adipic acid, and keep it until the reaction liquid is clear. The acid value is 44.5mg KOH / g and the viscosity is 970cP / 200°C. .

[0050] The reaction temperature was adjusted to 240°C, and 65g of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite and 300g of N,N'-bis-(3-(3,5-di-tert-butyl- ...

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Abstract

The invention provides a polyester resin for powder coatings with low volatile content. The polyester resin for powder coatings has the following characteristics: the molar ratio of polybasic acid to polyhydric alcohol is 1.04-1.08:1, and the acid value is 28 mgKOH / g- 45mgKOH / g, the polyester resin also includes the following components: by mass percentage, esterification catalyst 0.08% ~ 0.15%, auxiliary antioxidant 0.04% ~ 0.2%, main antioxidant 0.2% ~ 1%, curing accelerator 0 % to 0.1%, and also provides a method for preparing polyester resin for powder coating with low volatile content. The biggest feature of the polyester resin for powder coatings of the present invention is low volatile matter content, excellent mechanical properties, good water boiling resistance and good weather resistance.

Description

technical field [0001] The invention relates to a polyester resin for powder coatings with low volatile content and a preparation method thereof, in particular to a polyester resin which is used to prepare powder coatings and has extremely low volatility during its baking process and its preparation The method belongs to the field of industrial coatings. Background technique [0002] Powder coating has the characteristics of high efficiency, economy, environmental protection and excellent performance, and it is one of the important directions for the development of the coating industry. With the development of powder coating technology, its varieties are becoming more and more abundant, and its performance is more perfect. The current development of polyester resins for powder coatings focuses more on its application effects, such as leveling, surface clarity, impact, etc., and less attention is paid to its impact on the production process of powder coatings. [0003] Due ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08G63/181C08G63/18C08G63/20C08G63/78C09D167/02C09D7/12C09D5/03
Inventor 张良务陈国民曹永沂
Owner 广东伊诗德新材料科技有限公司
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