Polyester resin for 70/30 epoxy polyester mixed powder coating and preparation method of polyester resin

A powder coating, epoxy polyester technology, applied in powder coatings, polyester coatings, epoxy resin coatings, etc., can solve the problems of reducing the leveling performance of the board surface, reducing the glass transition temperature, and reducing the storage stability of the resin. Achieve the effects of excellent impact resistance, high storage stability and excellent leveling

Inactive Publication Date: 2017-12-26
江苏宝田新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase in the amount of monomers with a high degree of branching such as trimethylolpropane and trimellitic anhydride will significantly reduce the leveling performance of the board surface, and the orange peel is very serious; if the aliphatic long-chain monomer adipic acid is used, it will significantly improve the l

Method used

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  • Polyester resin for 70/30 epoxy polyester mixed powder coating and preparation method of polyester resin
  • Polyester resin for 70/30 epoxy polyester mixed powder coating and preparation method of polyester resin
  • Polyester resin for 70/30 epoxy polyester mixed powder coating and preparation method of polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) 2000g of PET that has been cleaned, removed, and crushed is mixed with 540g of neopentyl glycol and 440g of diethylene glycol in the presence of 4g of alcoholysis catalyst zinc acetate, with a reaction pressure of 1.3MPa and a reaction temperature of 235-240°C. Solution reaction 3h;

[0043] 2) Alcoholysis is completed, the pressure in the reactor is ≤-0.095MPa, the temperature is 180-240°C, and 420g of free polyols are removed by distillation, and 200g of terephthalic acid and 60g of isophthalic acid are added to the remaining molten mixture in the kettle , trimethylolpropane 50g, stabilizer (triphenyl phosphite) 4g, carry out esterification and / or transesterification reaction in the presence of monobutyl tin oxide 4g; Transesterification and / or esterification reaction temperature is 200 ℃ ~245°C; between 200-210°C, control the heating rate at 2-3°C / half hour; between 210-245°C, control the heating rate at 3-4°C / half hour;

[0044] 3) When the degree of esterificat...

Embodiment 2

[0048] 1) 2000g PET after cleaning, impurity removal and crushing, in the presence of 4g of alcoholysis catalyst zinc acetate and 540g of neopentyl glycol, 380g of 2-methyl-1,3-propanediol, the reaction pressure is 9MPa, and the reaction time is 235-240°C alcoholysis reaction for 0.6h;

[0049] 2) After the alcoholysis is over, directly add 1500g of terephthalic acid, 55g of trimethylolpropane, 4g of stabilizer (triphenyl phosphite) into the reactor, and carry out esterification in the presence of 4g of monobutyltin oxide And / or transesterification reaction; transesterification and / or esterification reaction temperature is 190°C~245°C; between 190-210°C, control the heating rate to 2-3°C / half hour, between 210-245°C, control The heating rate is 3-4°C / half an hour;

[0050] 3) When the degree of esterification reaches more than 96% (generally, it is observed that the temperature at the top of the reactivity tower drops below 50°C, the esterification water in the reactor is bas...

Embodiment 3

[0054] 1) PET2000g after cleaning, impurity removal and crushing treatment, in the presence of 5g alcoholysis catalyst tetrabutyl titanate, with 1080g neopentyl glycol, 190g 2-methyl-1,3-propanediol, the reaction pressure is 3MPa, the reaction temperature Alcoholysis reaction at 235-240°C for 2 hours;

[0055] 2) The alcoholysis is completed, the pressure in the reactor is ≤-0.09MPa, the temperature is 180-240°C, 540g of free polyols are removed by distillation, and 300g of terephthalic acid and trimethylolpropane are added to the remaining molten mixture in the kettle 50g, stabilizer (triphenyl phosphite) 4g, carry out esterification and / or transesterification reaction in the presence of monobutyl tin oxide 4g; The temperature of transesterification and / or esterification reaction is 200 ℃~245 ℃; 200- Between 210°C, control the heating rate at 2-3°C / half hour; between 210-245°C, control the heating rate at 3-4°C / half hour;

[0056] 3) When the degree of esterification reaches...

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Abstract

The invention discloses a polyester resin for 70/30 epoxy polyester mixed powder coating. The acid value of the polyester resin is 28-35 mg KOH/g, and the viscosity of the polyester resin is 3500-4500 mPa*s/200 DEG C. The polyester resin is prepared by melt polymerization of PET, a polyhydric alcohol, a polybasic acid and/ or an anhydride, and trimellitic anhydride, wherein the PET accounts for 40-75 wt% of total feeding amount, the polyhydric alcohol accounts for 40-80% of the mass of the PET, the molar ratio of the polyhydric alcohol to the polybasic acid and/ or anhydride is (1.0-1.1):1, and the trimellitic anhydride accounts for 4-6 wt% of the polyester resin for the 70/30 epoxy polyester mixed powder coating. According to the polyester resin prepared by the technical scheme disclosed by the invention, the molecular weight distribution is uniform; the glass transition temperature Tg is higher than 54 DEG C; the polyester resin is configured to the powder coating according to a standard formula; and the board surface prepared by spraying and curing with the coating has the characteristics of yellowing resistance, baking resistance, salt-fog resistance and the like which are characteristics of the powder coatings produced by the synthesis of high-quality polyester resin, and also has the advantages of good luster, good impact resistance (a test of positive/reverse impact of 100Kg*cm is passed) and a good leveling property.

Description

technical field [0001] The invention relates to a polyester resin and a preparation method thereof, in particular to a polyester resin for 70 / 30 epoxy polyester hybrid powder coating and a preparation method thereof. Background technique [0002] Polyester resins for thermosetting powder coatings are mostly made of thermosetting saturated polyester resins by polycondensation reaction of aromatic hydroxy acids (or anhydrides) and polyols. The polyol may be polyester polyol, ethylene glycol, diethylene glycol, etc. or a mixture of polyols. The product is used in epoxy polyester powder coating. The use of one polyol cannot meet the performance requirements of polyester, and it is often necessary to rationally mix and use multiple alcohols to achieve the best performance of polyester. Generally speaking, the deployment and use of various alcohols is beneficial to improve the gloss, viscosity, flow and other properties of polyester, thereby improving the stability of polyester....

Claims

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Application Information

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IPC IPC(8): C09D167/00C09D163/00C09D5/03C08G63/78C08G63/20C08G63/668
CPCC09D167/00C08G63/20C08G63/668C08G63/78C08K2003/2241C08K2003/3045C09D5/03C08L63/00C08K3/22C08K3/30
Inventor 蒋云姚丙乾蒋志峰
Owner 江苏宝田新材料股份有限公司
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