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Polyester resin for anti-blooming low-temperature hydroxyalkylamide curing powder coating and preparation method of polyester resin

A low-temperature hydroxyalkylamide and powder coating technology, which is applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of poor storage stability of coatings, affecting the mechanical properties of coating films, and poor appearance decoration, and achieves Excellent decorative performance and protective performance, improved low-temperature curing bloom resistance, excellent low-temperature curing bloom resistance effect

Inactive Publication Date: 2017-10-20
ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the low-temperature curing powder coatings and resins mainly have the following problems: 1. The glass transition temperature of the matrix resin is too low, resulting in poor storage stability of the resin and the finished coating, and easy agglomeration
2. The melt viscosity of the matrix resin is high, resulting in high melt viscosity of the coating film, poor leveling of the coating film, and poor appearance decoration
3. The curing cross-linking activity between the matrix and the curing agent is too high or too low. When curing and cross-linking, the reactivity is too high and the leveling of the coating film is poor; the reactivity is too low, the curing time is too long, the degree of curing cross-linking is low, and the Coating mechanical properties
4. When the low-temperature curing powder coating is cured, the surface is easy to bloom, which affects the surface performance and performance of the coating film. For this reason, some unsaturated carboxylic acids or anhydrides, such as maleic anhydride and fumaric acid, are introduced, but this will lead to Instability of resin performance and properties

Method used

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  • Polyester resin for anti-blooming low-temperature hydroxyalkylamide curing powder coating and preparation method of polyester resin
  • Polyester resin for anti-blooming low-temperature hydroxyalkylamide curing powder coating and preparation method of polyester resin
  • Polyester resin for anti-blooming low-temperature hydroxyalkylamide curing powder coating and preparation method of polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0036] The concrete implementation synthesis process is: (1) in the reaction kettle 3000ml that is equipped with heating device, stirrer and distillation column, the polyol component A (wherein 675 parts of neopentyl glycol , 75 parts of 2-methyl-1,3-propanediol), and the temperature is raised to 110-130°C under normal pressure; then the polyacid component B (990 parts of terephthalic acid, 990 parts of terephthalic acid, 90 parts of isophthalic acid, 75 parts of adipic acid) and 2.5 parts by mass of esterification catalyst component D (2.5 parts of which are monobutyltin oxide), and the temperature is gradually raised while stirring. (2) The temperature of the material rises to 165-175°C, the esterification reaction begins, and the esterification water begins to be generated and steamed out through the distillation column. The steam temperature at the top of the distillation column is controlled at 99°C ± 2°C; Esterification water is distilled out, and when the temperature of...

Embodiment B

[0038] The concrete implementation synthesis process is: (1) in the reaction kettle 3000ml that is equipped with heating device, stirrer and distillation column, the mass fraction that adds formula quantity is 725 parts of polyol component A (wherein 590 parts of neopentyl glycol , 60 parts of 2-methyl-1,3-propanediol, 75 parts of 1,4-cyclohexanedimethanol), and the temperature is raised to 110-130°C under normal pressure; Part B (990 parts of which is terephthalic acid, 90 parts of isophthalic acid), 60 parts by mass of hydrogenated dimer acid component C (60 parts of hydrogenated dimer soybean oil fatty acid) and 2.5 parts by mass Parts of esterification catalyst component D (wherein 2.5 parts are monobutyltin oxide), gradually warming up while stirring. (2) The temperature of the material rises to 165-175°C, the esterification reaction begins, and the esterification water begins to be generated and steamed out through the distillation column. The steam temperature at the to...

Embodiment C

[0040] The concrete implementation synthesis process is: (1) in the reaction kettle 3000ml that is equipped with heating device, stirrer and distillation column, the mass fraction that adds formula quantity is 746 parts of polyol component A (wherein 656 parts of neopentyl glycol , 15 parts of 2-butyl-2-ethyl-1,3-propanediol, 75 parts of 1,4-cyclohexanedimethanol), the temperature is raised to 110-130°C under normal pressure; 1080 parts of polybasic acid component B (wherein 960 parts are terephthalic acid, 120 parts of isophthalic acid), mass parts are 30 parts of hydrogenated dimer acid component C (wherein 30 parts of hydrogenated dimer tall oil fatty acid ) and mass parts are 3 parts of esterification catalyst component D (wherein 3 parts are stannous oxalate), gradually warming up while stirring. (2) The temperature of the material rises to 165-175°C, the esterification reaction begins, and the esterification water begins to be generated and steamed out through the distil...

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Abstract

The invention relates to polyester resin for powder coating and a preparation method of the polyester resin and provides polyester resin for an anti-blooming low-temperature hydroxyalkylamide curing powder coating and a preparation method of the polyester resin. The polyester resin is prepared from main components in percentage by mass as follows: a polyhydric alcohol component A, a polyhydric alcohol component B, a hydrogenated dimer acid component C, an esterification catalyst component D, an alcoholysis agent component E and an antioxidant component F through melt polymerization. The method comprises the steps as follows: the component A is added, then, the component B, the component C and the component D are added, and the temperature is gradually increased with stirring; a melt esterification condensation reaction is conducted; the component E is added for an acidolysis reaction; a decompression reaction is conducted; the component F is added and stirred to react; temperature decrease, discharging, cooling and crushing are performed. A film of the low-temperature hydroxyalkylamide curing powder coating has good low-temperature curing frosting resistance, good flexibility, excellent leveling property and excellent decoration performance and protection performance.

Description

technical field [0001] The invention relates to a polyester resin for powder coatings and a preparation method thereof, in particular to a polyester resin for anti-blooming low-temperature hydroxyalkylamide curing powder coatings and a preparation method thereof. Background technique [0002] With the increasing frequency of natural disasters caused by global warming, people's awareness and requirements for environmental protection have increased. Powder coatings are recognized as green and environmentally friendly coatings because they fully comply with the internationally popular "four E" (economy, environmental protection, high efficiency, and excellent performance) principles, and are one of the four directions for the development and research of the coatings industry. However, the leveling and curing temperatures of powder coatings are relatively high. The film-forming and curing temperatures of ordinary powder coatings are all between 180 and 220°C, and the baking time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C09D167/02C09D5/03C09D7/12
CPCC08G63/20C08K5/20C09D5/033C09D167/02
Inventor 应明友邱锋利汤明麟黄志钱廖萍
Owner ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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