Polyester resin for high gloss powder coating and preparation method and application thereof

A powder coating, polyester resin technology, applied in powder coatings, polyester coatings, epoxy resin coatings, etc., can solve the problems of poor leveling, high softening point and high temperature viscosity, affecting gloss performance, etc. The effect of prolonging the curing time, ensuring mechanical properties and high surface gloss

Active Publication Date: 2019-01-15
安徽恒隆新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain high leveling performance, it is required that the viscosity of polyester resin as the key material of powder coating should be low, but the viscosity is too low to affect the mechanical properties of the resin; on the other hand, in order to have qualified storage stability, polyester resin for powder coating is required The glass transition temperature of the resin must be above 50°C, and the weather-resistant polyester must even reach above 60°C. However, if the glass transition temperature is too high, the melt flow temperature of the resin will also increase accordingly, which will affect its leveling property and cause it to deteriorate. affect the gloss properties
[0005] In addition, for the 50/50 hybrid powder coating, because the resin components used are 50/50 polyester resin and E-12 epo...

Method used

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  • Polyester resin for high gloss powder coating and preparation method and application thereof
  • Polyester resin for high gloss powder coating and preparation method and application thereof
  • Polyester resin for high gloss powder coating and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The polyester resin for high-gloss powder coatings described in this embodiment, based on the total amount of raw materials for preparing the polyester resin, includes the following raw material components in molar percentages:

[0029]

[0030] The method for preparing high-gloss powder coating polyester resin described in the present embodiment may further comprise the steps:

[0031] (1) The neopentyl glycol, glyceryl isostearate, 2-hydroxyl-5-methyl m-xylylenedimethanol and 1,6-hexanediol dimethacrylate are mixed in a selected amount, and controlled Heating and melting at a temperature lower than 125°C;

[0032] (2) Add the described octadecanedioic acid, isophthalic acid and 4-trifluoromethyl salicylic acid of selected amount in above-mentioned mixture material, and add the described catalyst of selected amount, gradually heat up under nitrogen protection React until no obvious distillate is distilled out, and the acid value of the reactant is less than 30mgKOH...

Embodiment 2

[0037] The polyester resin for high-gloss powder coatings described in this embodiment, based on the total amount of raw materials for preparing the polyester resin, includes the following raw material components in molar percentages:

[0038]

[0039] The method for preparing the polyester resin for high-gloss powder coatings described in this embodiment is the same as that in Example 1.

[0040] After testing, the polyester resin prepared in this example has an acid value of 74 mgKOH / g, a softening point of 110° C., and a melt viscosity (200° C.) of 4210 mPa·s.

Embodiment 3

[0042] The polyester resin for high-gloss powder coatings described in this embodiment, based on the total amount of raw materials for preparing the polyester resin, includes the following raw material components in molar percentages:

[0043]

[0044] The method for preparing the polyester resin for high-gloss powder coatings described in this embodiment is the same as that in Example 1.

[0045] After testing, the polyester resin prepared in this example has an acid value of 72 mgKOH / g, a softening point of 98° C., and a melt viscosity (200° C.) of 2940 mPa·s.

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Abstract

The invention belongs to the technical field of powder coatings, in particular to polyester resin for a high gloss powder coating and a preparation method thereof and application thereof in preparinga 50/50 type powder coating. The polyester resin for the high gloss powder coating is prepared by polymerization of octadecanedioic acid, isophthalic acid, 4-trifluoromethylsalicylic acid, 2,6-Bis(hydroxymethyl)-p-cresol, neopentyl glycol, glyceryl isostearate, 1,6-hexanediol dimethacrylate, and 2,3-quinolinedicarboxylic acid as raw materials. The obtained polyester resin product has better structural flexibility and long flow time, has high surface gloss after curing into a film while ensuring mechanical properties, and can be used in the 50/50 mixed powder coating for obtaining a high glosscoating board surface.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, specifically relates to a polyester resin for high-gloss powder coatings, and further discloses its preparation method and its application for preparing 50 / 50 mixed powder coatings. Background technique [0002] Powder coating is a 100% solid powder that does not contain organic solvents. It is different from oil-based paints and water-based paints. It does not use solvent or water as a dispersion medium when coating, but uses air as a dispersion medium to evenly coat the workpiece. The surface is a new type of environmentally friendly paint that forms a special-purpose coating film after heating. Powder coating has the advantages of no VOC, environmental protection, energy saving, high construction efficiency and wide application range. With its advantages of economy, environmental protection, high efficiency and excellent performance, it is gradually replacing organic solvent-based coat...

Claims

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Application Information

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IPC IPC(8): C09D167/00C09D163/00C09D5/03C09D7/48C09D7/61C09D7/63C08G63/685C08G63/83
CPCC08G63/685C08G63/83C08K2003/2241C08K2003/3045C09D5/033C09D163/00C09D167/00C08L63/00C08K13/02C08K5/13C08K3/22C08K3/30C08K5/07C08L67/00
Inventor 叶新栋鲍观良王永垒
Owner 安徽恒隆新材料有限公司
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