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Polyester resin used for TGIC-cured high-adhesive-force high-leveling-property powder coating and preparation method of the polyester resin

A powder coating, polyester resin technology, applied in powder coatings, polyester coatings, coatings and other directions, can solve the problems of acrylic coatings peeling off, inability to meet the coating and coating, and the adhesion is difficult to meet the requirements of use, etc. To achieve the effect of excellent leveling performance and excellent adhesion

Active Publication Date: 2014-03-05
GUANGZHOU KINTE IND +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acrylic resin has the advantages of good weather resistance, hardness, transparency, etc. If the acrylic powder coating is sprayed on the cured polyester powder coating coating cured by TGIC and then cured, the molecular structure, polarity, etc. of the acrylic resin are different from those of polyester. There is a large difference between the resins, the adhesion between the acrylic paint coating and the polyester powder coating coating is difficult to meet the requirements of use, and even the acrylic paint coating may fall off
At present, the TGIC curable polyester resin produced by various domestic polyester resin manufacturers can basically meet the adhesion requirements between the coating and the substrate, but it cannot meet the requirements of the coating and the coating, especially the TGIC curable powder coating. Adhesion bond requirements with acrylic paint coatings

Method used

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  • Polyester resin used for TGIC-cured high-adhesive-force high-leveling-property powder coating and preparation method of the polyester resin
  • Polyester resin used for TGIC-cured high-adhesive-force high-leveling-property powder coating and preparation method of the polyester resin

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Embodiment Construction

[0013] Table 1 is the embodiment and comparative example of polyester resins for high adhesion and high leveling powder coatings. The specific implementation method is as follows: under nitrogen protection, add Neopentyl glycol, methylpropanediol, trimethylolpropane, 2-ethyl-2-butyl 1,3-propanediol in the proportions listed in Table 1 were heated and stirred to dissolve, then added terephthalic acid, adipic di Acid, isophthalic acid and monobutyltin catalyst, gradually warming up to about 180°C to start esterification and water distilled out, then gradually warming up to 240°C, esterification and polycondensation reaction for 13 hours, the esterification rate reached more than 95%, the acid value When the acid value reaches 10-15mgKOH / g, add acidolysis agent isophthalic acid, adipic acid or 1,4-cyclohexanedicarboxylic acid, and conduct vacuum condensation at 240°C for 5 hours when the acid value reaches 43-47mgKOH / g 2h to obtain polyester resin acid value 30 ~ 37mgKOH / g, visco...

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Abstract

The invention discloses a polyester resin used for TGIC-cured high-adhesive-force high-leveling-property powder coating. The polyester resin is prepared by melt polymerization from following main components: 30-45% of a polyol, 40-60% of a polyatomic acid, 8-20% of an acidolysis agent and 0.03-0.15% of a catalyst. The invention also discloses a preparation method of the polyester resin. The resin has excellent adhesive force and leveling property. The powder coating prepared by the resin has excellent adhesive force between a coating and a base material, and between the coating and a coating of acrylic acid transparent powder coating so that the coatings are not liable to peel off. The polyester resin can be used for coating in fields of coil steel, doors, hardware, automobile parts, and the like.

Description

technical field [0001] The invention relates to a polyester resin and a preparation method thereof, in particular to a TGIC-cured polyester resin for high-adhesion and high-leveling powder coating and a preparation method thereof. Background technique [0002] In recent years, powder coatings have been widely used in the fields of hardware, furniture, electrical appliances, building materials, and auto parts. However, with the improvement of human protection and beautification needs for coatings, traditional single-coat coatings can no longer meet the needs of modern coatings. , Such as door industry, coil steel, auto parts and other industries generally have multi-layer coating requirements. The multi-layer coating process generally consists of primer, intermediate coat, top coat and finish coat, etc. Each layer of paint endows the coating with different functions. Due to the differences in the components, polarity, and interfacial tension of each layer of paint, the bond...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/183C08G63/78C09D167/02C09D5/03
Inventor 潘从艺李勇何涛顾宇昕古沸常刘亮李光
Owner GUANGZHOU KINTE IND
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