Polyester resin for low-temperature cured powder paint and preparation method of polyester resin

A polyester resin and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as frosting, fogging, uneven film formation, and poor appearance of low-temperature cured coating films, and reach the glass transition temperature High, good mechanical properties and weather resistance, good surface decoration effect

Active Publication Date: 2012-10-10
广东伊诗德新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a catalyst is used to reduce the baking temperature, several important problems will arise: first, there is a risk of premature reaction in the extrusion process at a temperature of 90°C to 100°C; secondly, due to the part before the powder is completely melted Cross-linking will lead to uneven film formation, resulting in poor appearance, orange peel and ripples; in addition, there will be problems with low-temperature curing coating blooming and haze

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the reaction kettle equipped with heating device, agitator and condensation tower, add 8% ethylene glycol, 25% neopentyl glycol and 1.2% 1,6-hexanediol according to the mass ratio, and raise the temperature to 130°C Heat and stir to melt; add 50% terephthalic acid, 5.4% adipic acid and 0.1% monobutyltin oxide, continue to heat up the reaction under nitrogen, and start esterification reaction at 180°C and polycondensation to produce esterified water distillate from 180°C to 240°C for 2 hours, add 0.12% triphenyl phosphite, continue to heat up to 260°C, keep warm until the esterification rate reaches over 95%, cool down to 220°C, vacuum polycondensate, and then add 2.78 % adipic acid and 6% isophthalic acid; keep the temperature at 220°C, polycondense again in vacuum to remove the esterification water in the reaction material; cool down to 210°C, add 1.4% methacrylic acid, and stir well Discharge, obtain acid number 52.8 mgKOH / g, viscosity is 26 poises (broolfield cone...

Embodiment 2

[0020] In the reaction kettle equipped with heating device, agitator and condensation tower, add 30% neopentyl glycol, 2.2% 1,6-hexanediol and 5% 1,4-cyclohexanedimethanol in mass ratio , heat up to 150°C, heat and stir to melt; add 42% terephthalic acid, 6.1% adipic acid and 0.08% monobutyltin oxide, continue to heat up the reaction under nitrogen, and start esterification reaction and polycondensation at 190°C Esterified water is distilled out; gradually heat up from 190°C for 2 hours to 250°C, add 0.1% triphenyl phosphite, continue to heat up to 260°C, keep warm until the esterification rate reaches above 95%, cool down to 218°C, vacuum Polycondensation, then add 4.82% adipic acid and 7.2% isophthalic acid; keep the temperature at 222°C for another vacuum polycondensation, remove the esterification water in the reaction material, cool down to 212°C, add 2.5% methacrylic acid , stirred evenly and discharged, the acid value was 48.6mgKOH / g, the viscosity was 30.8 poise (brool...

Embodiment 3

[0022] In the reaction kettle equipped with heating device, agitator and condensation tower, add 27.5% of neopentyl glycol and 4.5% of 1,6-hexanediol according to the mass ratio, heat up to 160°C and heat and stir to melt; add 20% of Terephthalic acid, 8.6% adipic acid and 0.05% monobutyltin oxide, continue to heat up the reaction under nitrogen, and start the esterification reaction at 200 ° C, and polycondensate to produce esterification water; gradually increase the temperature from 200 ° C for 2 Hours to 245°C, add 0.02% triphenyl phosphite, continue to heat up to 260°C, keep warm until the esterification rate reaches 95%, cool down to 222°C, vacuum polycondensation, then add 2.8% adipic acid and 36.53% isophthalic acid; keep the temperature at 218°C for vacuum polycondensation again, remove the esterification water in the reaction material, and discharge the material after cooling down to 208°C. The obtained polyester resin had an acid value of 54 mgKOH / g, a viscosity of ...

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Abstract

The invention relates to polyester resin for low-temperature cured powder paint and a preparation method of the polyester resin. The polyester resin is characterized by comprising the following ingredients in percentage by mass: 0 to 10 percent of ethylene glycol, 10 to 40 percent of neopentyl glycol, 0 to 8 percent of 1,6-ethylene glycol, 0 to 5 percent of 1,4-cyclohexanedimethanol, 20 to 60 percent of terephthalic acids, 2 to 15 percent of adipic acid, 0.05 to 0.2 percent of monobutyltin oxide, 0.02 to 0.15 percent of triphenyl phosphate, 0 to 5 percent of adipic acid, 2 to 40 percent of m-phthalic acid and 0 to 5 percent of methacrylic acid. The polyester resin and the preparation method have the advantages that the curing at the low temperature condition of 130 DEG C to 140 DEG C can be realized, in addition, the storage stability is good, and the like.

Description

technical field [0001] The invention relates to a method for preparing polyester resin for low-temperature curing powder coatings, in particular to a method for preparing environmentally friendly polyester resins for low-temperature curing powder coatings using β-hydroxyalkylamide as a curing agent. The main raw material of the environment-friendly powder coating belongs to the technical field of material synthesis. Background technique [0002] Today's thermosetting powder coatings are quite mature in technology. Widely used in various fields such as home appliances, transportation and automobile industries, it provides many ecological advantages and high levels of performance over solvent-based coatings. However, it also has some limitations. One of the main issues faced in the development is how to coordinate some of its conflicting elements, such as: anti-caking stability during storage and coalescence and leveling at the lowest baking temperature and the shortest pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/47C08G63/85C09D167/02C09D167/06C09D5/03
Inventor 邓慕建祁永华龚兴宇曹永沂张良务
Owner 广东伊诗德新材料科技有限公司
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