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PU curable powder paint polyester resin excellent in cold resistance and production method

A polyester resin and powder coating technology, applied in the polyester resin field, can solve the problems of poor weather resistance, loss of coating performance, and inability to use

Active Publication Date: 2019-08-23
黄山嘉恒科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the above patent application, bisphenol A type epoxy resin, polyvinyl chloride resin and epoxy resin are used; and the defect of the above-mentioned raw materials is poor weather resistance, which is easy to occur when used outdoors after being exposed to wind and sun. Degradation, thereby losing the performance of the coating film, and cannot be used in outdoor coating systems

Method used

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  • PU curable powder paint polyester resin excellent in cold resistance and production method
  • PU curable powder paint polyester resin excellent in cold resistance and production method
  • PU curable powder paint polyester resin excellent in cold resistance and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The preparation method of the PU solidified powder coating polyester resin with excellent cold resistance comprises the following steps:

[0055] (1) Add 15mol of terephthalic acid, 15mol of 3,3-tetramethylene glutaric acid, 15mol of N-butyldiethanolamine, 15mol of 1,4-di(hydroxymethyl)cyclohexane and catalyst into the reactor, first After fully melting at 120°C and stirring evenly, slowly raise the temperature to 185°C at a heating rate of 5°C / h and keep it warm for 3 hours to obtain a mixed material;

[0056] The polymerization catalyst is 2-octylsuccinate di(tributyltin), and the consumption is 0.12mol;

[0057] (2) When the acid value is reduced to 85mgKOH / g, add 10mol resorcinol-O, O'-diacetic acid, 10mol hydrogenated ricinoleic acid and 12mol neopentyl glycol to the above mixed material, and then Gradually raise the temperature at a rate of 10°C / h to 235°C, fully react for 6 hours, react until no obvious distillate is distilled out, add antioxidant tetrakis[β-(3,...

Embodiment 2

[0061] The preparation method of the PU solidified powder coating polyester resin with excellent cold resistance comprises the following steps:

[0062] (1) Add 12mol of terephthalic acid, 18mol of 3,3-tetramethylene glutaric acid, 12mol of N-butyldiethanolamine, 16mol of 1,4-di(hydroxymethyl)cyclohexane and catalyst into the reactor, first After fully melting at 120°C and stirring evenly, slowly raise the temperature to 185°C at a heating rate of 5°C / h and keep it warm for 3 hours to obtain a mixed material;

[0063] The polymerization catalyst is 2-octylsuccinate di(tributyltin), and the consumption is 0.12mol;

[0064] (2) When the acid value is reduced to 85mgKOH / g, add 10mol resorcinol-O, O'-diacetic acid, 12mol hydrogenated ricinoleic acid and 12mol neopentyl glycol to the above mixed material, and then Gradually raise the temperature at a rate of 10°C / h to 235°C, fully react for 6 hours, react until no obvious distillate is distilled out, add antioxidant tetrakis[β-(3,...

Embodiment 3

[0068] The preparation method of the PU solidified powder coating polyester resin with excellent cold resistance comprises the following steps:

[0069] (1) Add 10mol of terephthalic acid, 20mol of 3,3-tetramethylene glutaric acid, 15mol of N-butyldiethanolamine, 15mol of 1,4-di(hydroxymethyl)cyclohexane and catalyst into the reactor, first After fully melting at 120°C and stirring evenly, slowly raise the temperature to 180°C at a heating rate of 6°C / h and keep it warm for 3 hours to obtain a mixed material;

[0070] The polymerization catalyst is 2-octylsuccinate di(tributyltin), and the consumption is 0.1mol;

[0071] (2) When the acid value is reduced to 85 mgKOH / g, add 10 mol of resorcinol-O, O'-diacetic acid, 10 mol of hydrogenated ricinoleic acid and 10 mol of neopentyl glycol to the above mixed material, and then Gradually raise the temperature at a rate of 10°C / h to 235°C, fully react for 6 hours, react until no obvious distillate is distilled out, add antioxidant te...

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Abstract

The invention belongs to the field of polyester resin, and relates to PU curable powder paint polyester resin excellent in cold resistance and a production method thereof. The polyester resin is formed through copolymerization of terephthalic acid, 3,3-tetramethyleneglutaric acid, resorcinol-O,O'-diacetic acid, DL-12-hydroxystearic acid, N-butyldiethanolamine, 1,4-cyclohexanedimethanol, catechin and the like. According to the PU curable powder paint polyester resin excellent in cold resistance and the production method thereof, by means of the 3,3-tetramethyleneglutaric acid, the resorcinol-O,O'-diacetic acid, the DL-12-hydroxystearic acid and the N-butyldiethanolamine which are excellent in cold resistance, a chain segment of the polyester resin is soft, and the low-temperature resistanceperformance is outstanding, so that the low-temperature brittleness of final film is reduced; and the obtained polyester resin and a polyurethane curing agent can be cured, the cold resistance of thefilm is excellent, the impact is almost unaffected after freezing is conducted at 0 DEG C and -5 DEG C for 6 h respectively, and the performance of the final film completely meets the requirements ofpowder paint.

Description

technical field [0001] The invention belongs to the field of polyester resins, and relates to the above-mentioned polyester resin for PU curing powder coating with excellent cold resistance, and also relates to a preparation method of the above-mentioned polyester resin and its application in B1530 curing system. Background technique [0002] Due to its excellent comprehensive performance, weather resistance and relatively low cost, polyester powder coatings are widely used in outdoor facilities such as construction, automobiles, and transportation. With the weather resistance of polyester powder coatings, there are also disadvantages. For example, its high hardness and high brittleness lead to poor cold resistance, and the impact performance drops significantly at low temperatures. It has relatively large defects in many low-temperature areas in winter. [0003] PU is the abbreviation of polyurethane. In powder coatings, PU generally refers to polyurethane curing agent. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685C08G63/672C08G63/78C08G63/85C09D5/03C09D167/02
CPCC08G63/672C08G63/6856C08G63/78C08G63/85C09D5/03C09D167/02
Inventor 汪云端梁优莲王明良
Owner 黄山嘉恒科技有限公司
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