PEN modified polyester resin for epoxy polyester mixed powder paint and preparation method thereof

A technology of epoxy polyester and powder coatings, which is applied in the direction of powder coatings, polyester coatings, epoxy resin coatings, etc., which can solve the problems of complex production process, limited development, high cost, etc., and achieve reduced production costs and excellent leveling , high storage stability

Inactive Publication Date: 2018-01-19
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

[0006] However, the development of 2,6-naphthalene dicarboxylic acid monomer has been restricted for a long time due to the high cost and complicated production process.
The research on 2,6-naphthalene dicarboxylic acid in polyester resins for powder coatings is relatively rare, and there is no use of recycled PEN materials to prepare polyester resins for powder coatings

Method used

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  • PEN modified polyester resin for epoxy polyester mixed powder paint and preparation method thereof
  • PEN modified polyester resin for epoxy polyester mixed powder paint and preparation method thereof
  • PEN modified polyester resin for epoxy polyester mixed powder paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) 1850g of PET and 620g of PEN after cleaning, impurity removal and crushing are mixed with 850g of 2-methyl-1,3-propanediol in the presence of 4.8g of alcoholysis catalyst zinc acetate at a pressure of 1.2MPa and a temperature of 235-240 ℃ alcoholysis reaction for 3h;

[0043] 2) The alcoholysis is completed, the pressure in the reactor is ≤-0.095MPa, the temperature is 180-240°C, and the free polyols are removed by distillation (the polyols obtained after separation are separated by rectification, and the ethylene glycol in them is directly sold as a by-product , other polyols except ethylene glycol can be applied mechanically), add neopentyl glycol 50g, terephthalic acid 260g, isophthalic acid 100g, adipic acid 60g, stabilizer ( Triphenyl phosphite) 3.3g, carry out esterification and / or transesterification in the presence of monobutyl tin oxide 3.3g;

[0044] 3) When the degree of esterification reaches more than 96% (generally, it is observed that the temperature ...

Embodiment 2

[0048] Step 1) is identical with embodiment 1;

[0049] 2) After the alcoholysis is finished, directly add neopentyl glycol 50g, terephthalic acid 1200g, isophthalic acid 170g, adipic acid 90g, stabilizer (triphenyl phosphite) 3.3g in the reactor, Carry out esterification and / or transesterification in the presence of monobutyltin oxide 3.3g;

[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 basically exhausted, and the degree of esterification reaches more than 96%), when the acid value is When the test viscosity is 3000±500mPa.s at 28±2mgKOH / g and 150°C, the transesterification and esterification reactions are over;

[0051] Carry out reduced pressure polymerization reaction, the described reduced pressure polymerization reaction conditions are: the pressure inside the reactor ≤ -0.09MPa, temperature 220 ~ 250 ° C; ...

Embodiment 3

[0054] 1) 1850g of PET and 620g of PEN after washing, removing impurities and crushing, react with 1270g of neopentyl glycol in the presence of 8g of alcoholysis catalyst zinc acetate at a pressure of 8MPa and a temperature of 235-240°C for 1h;

[0055] 2) The alcoholysis is completed, the pressure in the reactor is ≤-0.09MPa, the temperature is 180-240°C, the free polyols are removed by distillation, and 940g of terephthalic acid, 230g of isophthalic acid, Adipic acid 90g, stabilizer (triphenyl phosphite) 4g, carry out esterification and / or transesterification in the presence of monobutyl tin oxide 4g;

[0056] 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 basically exhausted, and the degree of esterification reaches more than 96%), when the acid value is When the test viscosity is 3000±500mPa.s at 28±2mgKOH / g and 150°C, ...

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Abstract

The invention discloses a PEN modified polyester resin for epoxy polyester mixed powder paint. The PEN modified polyester resin for epoxy polyester mixed powder paint has an acid value of 68-75mgKOH / g, a viscosity of 2000-5500mPa.s / 200DEG C or an acid value of 48-55mgKOH / g, a viscosity of 3000-5500mPa.s / 200DEG C or an acid value of 32-35mgKOH / g, and a viscosity of 4000-6000mPa.s / 200DEG C. The preparation method includes: conducting alcoholysis on a mixture of PET and PEN in a mass ratio of 2.5-3:1 by polyol, then carrying out ester exchange reaction and / or esterification reaction with polyol,polyacid / anhydride, then carrying out decompression polycondensation reaction and trimellitic anhydride end-capping reaction, thus obtaining the polyester resin. The resin has the characteristics of ahigh glass transition temperature Tg above 58DEG C and high storage stability, and a board prepared from the polyester resin according to the standard formula has the characteristics of yellowing resistance, baking resistance, salt fog resistance and the like peculiar to powder paint produced by high quality polyester resin synthesis, and also has good gloss (greater than 105% (60DEG C glossmetertest)), and impact resistance (resistance to + / -100Kg.cm impact).

Description

technical field [0001] The invention relates to a preparation method of polyester resin, in particular to a polyester resin for PEN-modified 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 products are used in the manufacture of epoxy polyester powder coatings, pure polyester powder coatings and polyurethane powder coatings. 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, fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D163/00C09D5/03C08G63/20C08G63/668C08G63/78C08J11/24C08L67/02
CPCY02W30/62
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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