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Powder coating polyester resin which can be stably stored and preparation method thereof

A polyester resin and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of coating processing performance, storage performance and application performance discount, lower glass transition temperature, and lower storage stability. To achieve the effect of ensuring leveling performance, storage stability and high glass transition temperature

Inactive Publication Date: 2019-07-23
JIANGSU RAP RESIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve a proper balance among the parameters of molecular weight, functionality, acid value, viscosity and glass transition temperature of the resin, resulting in a discount on the processing performance, storage performance and application performance of the coating.
Generally speaking, the acid value increases, the viscosity decreases, and the leveling property improves, but the glass transition temperature will also decrease, and the storage stability will decrease. What's more, when the temperature is high in summer, agglomeration will occur

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0028] The embodiment of the present invention also provides a method for preparing a powder coating polyester resin with high acid value, low viscosity and high glass transition temperature, which is used to prepare the above-mentioned powder coating polyester resin, and the raw materials are taken according to the dosage given above, including the following step:

[0029] Step 1) The first stage reaction: Add the polyol, catalyst and the first part of polyacid weighed in proportion to the reaction kettle, pass nitrogen gas into the reaction kettle, raise the temperature to 150°C to melt the polyol, start stirring, and gradually increase the temperature To 220-240°C, continue to react for 8-10 hours until the reactant is clear and transparent, take a sample to test the acid value and viscosity of the reactant, if the acid value is 8-20mgKOH / g, and the viscosity is 200-500cps@200°C, proceed to step 2 the second stage reaction of

[0030] Step 2) The second-stage reaction: add...

Embodiment 1

[0038] This embodiment is a powder coating polyester resin with high acid value, low viscosity and high glass transition temperature, and its preparation steps are as follows:

[0039] The first step: in reactor, add neopentyl glycol 1500 weight parts, ethylene glycol 200 weight parts, trimethylolpropane 70 weight parts, terephthalic acid 3000 weight parts and 3 weight parts catalysts (monobutyl Tin oxide), nitrogen gas was passed into the reactor, the temperature was raised to 150°C, stirring was started, the temperature was raised to about 240°C at a rate of 20°C / 30min, the reaction was carried out for 8 hours, and the reactant was colorless and transparent, and the acid value of the reactant was determined by sampling and viscosity, and collect the water produced by the esterification reaction;

[0040]Step 2: When the acid value drops to 14.7mgKOH / g and the viscosity is 350cps@200°C, cool down to 210°C, add 200 parts by weight of adipic acid and 250 parts by weight of trim...

Embodiment 2

[0044] This embodiment is a powder coating polyester resin with high acid value, low viscosity and high glass transition temperature, and its preparation steps are as follows:

[0045] The first step: in the reactor, add 1300 parts by weight of neopentyl glycol, 80 parts by weight of ethylene glycol, 100 parts by weight of diethylene glycol, 60 parts by weight of trimethylolpropane, 3000 parts by weight of terephthalic acid and 3 parts by weight of catalyst (monobutyltin oxide), nitrogen gas was passed into the reactor, the temperature was raised to 150°C, stirring was started, the temperature was raised to about 240°C at a rate of 20°C / 30min, and the reaction was carried out for 8.5 hours until the reactant was colorless and transparent. Take samples to measure the acid value and viscosity of the reactants, and collect the water produced by the esterification reaction;

[0046] Step 2: When the acid value drops to 12.8mgKOH / g and the viscosity is 300cps@200°C, cool down to 21...

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Abstract

The invention discloses powder coating polyester resin which can be stably stored and a preparation method thereof. The polyester resin is prepared from the ingredients in weight percentage: 15 to 55%of polyhydric alcohol, 45 to 85% of polyatomic acid, a catalyst and an additive, wherein the use amount of the catalyst is 0.005 to 0.1% of the total weight of the polyhydric alcohol and the polyatomic acid, and the use amount of the additive is 0.01 to 0.03% of the total weight of the polyhydric alcohol and the polyatomic acid. An acid value of the polyester resin is 50 to 80 mg KOH / g, the viscosity of the polyester resin is 1000 to 3000 cps@200 DEG C, and a glass transition temperature of the polyester resin is 50 to 70 DEG C. According to the polyester resin disclosed by the invention, theraw material proportion is controlled; under the nitrogen environment, organic tin is utilized to catalyze the polyhydric alcohol and the polyatomic acid to prepare the powder coating polyester resinwith the high acid value, the low viscosity and the high glass transition temperature through esterification and condensation polymerization reaction. As the resin simultaneously has the characteristics of high acid value and high glass transition temperature, good leveling property and storage stability are both taken into consideration.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a powder coating polyester resin capable of stable storage and a preparation method thereof. Background technique [0002] Because it does not contain volatile solvents, powder coatings are environmentally friendly coatings, and have a wide range of uses in the environment where the entire industry advocates environmental protection and pollution-free. The unique characteristics of environmental protection, economy, high efficiency and excellent performance of powder coating also make it unique among environmentally friendly coatings. It is used in various fields such as automobiles, building materials, home appliances, cans, etc., especially in the building materials industry and home appliance industry. Development is rapid. [0003] Compared with solvent-based coatings, the performance of powder coatings in terms of production, processing and construction depends largely on the propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/668C08G63/85C09D167/00C09D5/03
CPCC08G63/20C08G63/668C08G63/85C09D5/03C09D167/00
Inventor 周琦邓煜东俞从昀夏丽莉宋继瑞
Owner JIANGSU RAP RESIN TECH CO LTD
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