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Polyester resin for self-leveling powder coating and preparation method thereof

A polyester resin and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of complex preparation process, high cost, incomplete applicable system, etc., and achieve the effect of simple process and low cost

Active Publication Date: 2021-10-26
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

[0006] The preparation of self-leveling powder coatings mainly depends on the polyester resin products used, but at present, polyester resins for self-leveling powder coatings have complex preparation processes, high costs, and incomplete applicable systems (no indoor hybrid products), Problems such as inability to cure at low temperature

Method used

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  • Polyester resin for self-leveling powder coating and preparation method thereof
  • Polyester resin for self-leveling powder coating and preparation method thereof
  • Polyester resin for self-leveling powder coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a preparation method of polyester resin for self-leveling powder coatings, including:

[0037] (1) Add 9 mole parts of pentaerythritol and 11 mole parts of glycerin into the reaction kettle, and stir and mix evenly below 120°C;

[0038] (2) In the mixed material that step (1) obtains, add the adipic acid of 8 mole fractions, the catalyst monobutyl tin oxide relative to the 0.12% of raw material total molar weight, under nitrogen protection, with 10 DEG C / h The heating rate is raised to 164°C and kept warm to carry out the polymerization reaction;

[0039] (3) When the acid value of the reactant is reduced to below 20mgKOH / g and the hydroxyl value is 380mgKOH / g, stop the reaction, add 17 molar fractions of isooctanoic acid and 5 molar fractions of n-butyric acid, and The heating rate of h is raised to 179° C. and continues to be incubated to carry out the polymerization reaction;

[0040] (4) When the hydroxyl value of the reactant is reduced t...

Embodiment 2

[0047] This embodiment provides a preparation method of polyester resin for self-leveling powder coatings, including:

[0048] (1) Add 13 mole parts of pentaerythritol and 13 mole parts of glycerin into the reaction kettle, and stir and mix evenly below 120°C;

[0049] (2) In the mixed material that step (1) obtains, add the adipic acid of 10 mole fractions, the catalyst monobutyl tin oxide relative to the 0.18% of raw material total molar weight, under nitrogen protection, with 12 DEG C / h The heating rate is raised to 165°C and kept warm to carry out the polymerization reaction;

[0050](3) When the acid value of the reactant is reduced to below 20mgKOH / g and the hydroxyl value is 385mgKOH / g, stop the reaction, add 15 molar fractions of isooctanoic acid and 6 molar fractions of n-butyric acid, and The heating rate of h is raised to 180° C. to continue the insulation to carry out the polymerization reaction;

[0051] (4) When the hydroxyl value of the reactant is reduced to ...

Embodiment 3

[0058] This embodiment provides a preparation method of polyester resin for self-leveling powder coatings, including:

[0059] (1) Add 12 mole parts of pentaerythritol and 14 mole parts of glycerin into the reaction kettle, and stir and mix evenly below 120°C;

[0060] (2) In the mixed material that step (1) obtains, add the adipic acid of 10 mole fractions, the catalyst monobutyl tin oxide relative to the 0.2% of raw material total molar weight, under nitrogen protection, with 11 DEG C / h The heating rate is raised to 163°C and kept warm to carry out the polymerization reaction;

[0061] (3) When the acid value of the reactant is reduced to below 20mgKOH / g and the hydroxyl value is 320mgKOH / g, stop the reaction, add 17 molar fractions of isooctanoic acid and 7 molar fractions of n-butyric acid, and The heating rate of h is raised to 183° C. and continues to be incubated to carry out the polymerization reaction;

[0062] (4) When the hydroxyl value of the reactant is reduced ...

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Abstract

The invention provides polyester resin for the self-leveling powder coating and a preparation method. Pentaerythritol, adipic acid, glycerol, terephthalic acid, isocaprylic acid, n-butyric acid, diethylene glycol diglycidyl ether and methylmalonic acid are used as main raw materials; the polyester resin for the disposable low-temperature curable self-leveling powder coating is obtained by adopting a segmented polymerization mode. The polyester structure has a proper amount of ester groups with low surface tension, so that the softening point of the product is reduced, low-temperature curing is realized, the problem of insufficient leveling property of a low-temperature curing coating film is solved due to excellent self-leveling property, and the ultrahigh-leveling coating film is obtained. According to the preparation process, special raw materials do not need to be prepared in advance, the 70 / 30 self-leveling polyester resin product is directly prepared by adopting a single-kettle synthesis process, the process is simple, and the cost is relatively low.

Description

technical field [0001] The invention belongs to the field of powder coatings, in particular to a polyester resin for self-leveling 70 / 30 powder coatings and a preparation method thereof. Background technique [0002] Powder coating is a new type of solvent-free 100% solid powder coating, which has the characteristics of solvent-free, pollution-free, recyclable, environmental protection, energy and resource saving, labor intensity reduction and high mechanical strength of the coating film. It is widely used in the field of surface coating. [0003] The current powder coatings all need to add leveling agent to increase the leveling performance of the coating film to obtain a high leveling level coating film, but the use of leveling agent will cause obvious batches due to uneven mixing due to the small amount of leveling agent used. The problem of poor stability. [0004] Polyester resins for self-leveling powder coatings can better solve this problem. For example, ZL20171057...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/12C08G63/78C09D167/00C09D5/03
CPCC08G63/914C08G63/12C08G63/78C09D167/00C09D5/03
Inventor 汪云端梁优莲刘春容
Owner 黄山嘉恒科技有限公司
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