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Large-dimension aromatic ring structure-containing polyester for powder coating and preparation method of polyester

A powder coating, large-scale technology, applied in the direction of powder coatings, epoxy resin coatings, polyester coatings, etc., can solve the limited ability of molecular bond rotation and thermal movement, the limited improvement of polyester resin heat resistance, powder It is difficult to improve the heat resistance of coatings and other problems, and achieve the effect of solving heat resistance and melt processing processability, low melt viscosity and high heat resistance

Inactive Publication Date: 2014-12-17
HAIAN INST OF HIGH TECH RES NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the field of epoxy / polyester powder coatings, one of the technical problems in current applications is that it is difficult to improve the heat resistance of powder coatings
Usually, the heat resistance of polyester resins and powder coatings can be improved by increasing the cross-linking density of the resin. However, with the increase of the cross-linking density, the melt viscosity of the resin rises sharply, and the high-temperature fluidity becomes poor, which directly affects Powder coating coating process
Therefore, one of the biggest technical problems in the field of polyester resin is the contradiction between resin heat resistance and viscosity.
Japan's Sumitomo Chemical Co., Ltd. has disclosed a liquid crystal polyester composition in recent years. Through the introduction of regular structure benzene ring and biphenyl structure, it is surprisingly found that while the glass transition temperature of polyester is improved to a certain extent, its viscosity is not It is too affected, which provides a solution to solve the contradiction between heat resistance and viscosity that is difficult to balance. However, because the benzene ring and other structures used are small-sized aromatic rings, it limits the ability of molecular bond rotation and thermal movement. It is still relatively limited. While ensuring that the viscosity does not change significantly, the efficiency of improving the heat resistance of polyester resins is relatively limited

Method used

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  • Large-dimension aromatic ring structure-containing polyester for powder coating and preparation method of polyester
  • Large-dimension aromatic ring structure-containing polyester for powder coating and preparation method of polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 40 g of neopentyl glycol, 12 g of ethylene glycol, and 0.5 g of water into a 250 mL four-neck flask equipped with a mechanical stirrer, thermometer, rectification tube, vacuum and nitrogen introduction device, heat to 100 ° C and stir for 30 min. Add 26 g of dimethyl 1,8-anthracene dicarboxylate, 11 g of terephthalic acid, 6 g of isophthalic acid, and 1.5 g of adipic acid, stir and mix, and appropriately increase the nitrogen gas intake. 0.2 g of dibutyltin oxide was added, and the temperature was raised to 130° C. It was found that water generated by the esterification reaction was produced. When the esterification rate reaches about 95%, the acid value of the system reaches 15 mgKOH / g, vacuumize for polycondensation reaction; when the esterification rate reaches 5mgKOH / g, the softening point is around 100°C, add 2g of isophthalic acid for acidolysis reaction , when the acid value reaches 60-65 mgKOH / g, vacuumize for the second time, the reaction system ester reach...

Embodiment 2

[0021] Add 35 g of neopentyl glycol, 17 g of ethylene glycol, and 0.5 g of water into a 250 mL four-necked flask equipped with a mechanical stirrer, thermometer, rectification tube, vacuum and nitrogen introduction device, heat to 100 °C and stir for 30 min. Add 20 g of dimethyl 1,8-anthracene dicarboxylate, 8 g of terephthalic acid, 14 g of isophthalic acid, and 0.5 g of adipic acid, stir and mix, and appropriately increase the nitrogen gas intake. 0.5 g of dibutyltin oxide was added, and the temperature was raised to 130° C. It was found that water generated by the esterification reaction was produced. When the esterification rate reaches about 95%, the acid value of the system reaches 15 mgKOH / g, vacuumize for polycondensation reaction; when the esterification rate reaches 5mgKOH / g, the softening point is around 100°C, add 3g of isophthalic acid for acidolysis reaction , when the acid value reaches 60-65 mgKOH / g, vacuumize for the second time, the reaction system ester reac...

Embodiment 3

[0023] Add 20 g of neopentyl glycol, 21 g of ethylene glycol, and 0.8 g of water into a 250 mL four-necked flask equipped with a mechanical stirrer, a thermometer, a rectifying tube, a vacuum and nitrogen introduction device, heat to 100 °C and stir for 30 min. Add 15 g of dimethyl 1,8-anthracene dicarboxylate, 7 g of terephthalic acid, 12 g of isophthalic acid, and 2 g of adipic acid, stir and mix, and appropriately increase the nitrogen gas intake. 1.5 g of dibutyltin oxide was added, and the temperature was raised to 130° C. It was found that water generated by the esterification reaction was produced. When the esterification rate reaches about 95%, the acid value of the system reaches 15 mgKOH / g, and the polycondensation reaction is carried out by vacuuming; when the esterification rate reaches 5 mgKOH / g, the softening point is around 100°C, and 5 g of isophthalic acid is added for acidolysis reaction , when the acid value reaches 60-65 mgKOH / g, vacuumize for the second ti...

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Abstract

The invention discloses a large-dimension aromatic ring structure-containing polyester for a powder coating and a preparation method of the polyester. The adopted technical scheme is that 1,8-anthracenedicarboxylic acid dimethyl ester is selected as a synthesis raw material to introduce a large-dimension anthracene ring to the polyester so that the glass transition temperature of the polyester can be increased; the polyester resin is prepared from the following major components in parts by weight: 12.0-25.5 parts of 1,8-anthracenedicarboxylic acid dimethyl ester, 10.0-32.0 parts of terephthalic acid, 6.5-17.0 parts of m-phthalic acid, 0.5-3.0 parts of adipic acid, 18.0-41.0 parts of C2-C6 polyhydric alcohol and 0.02-2 parts of catalyst through the steps of heating at different stages to arouse an esterification reaction, a condensation polymerization reaction and an acidolysis reaction. The large-dimension aromatic ring structure-containing polyester for the powder coating has the beneficial effects that the obtained polyester resin is capable of solving the contradiction between heat resistance and melting manufacturability to a certain extent, and has the characteristics of high glass transition temperature, low melt viscosity, good storage stability and the like; and an epoxy / polyester powder coating prepared from the polyester is resistant to acids and bases, and also resistant to boiling in water, and has excellent adhesion to metal substrates.

Description

technical field [0001] The invention relates to the technical field of powder coatings, in particular to a polyester for powder coatings containing a large-size aromatic ring structure and a preparation method thereof. Background technique [0002] Powder coating is a coating that contains 100% solids and is applied in the form of powder. Unlike general solvent-based and water-based coatings, powder coatings use air as the dispersion medium, which is a solvent-free, low-pollution, high-efficiency coating. green paint. Polyester resin is an important class of thermosetting resins required for the preparation of powder coatings, most of which are saturated. It has a variety of systems, and its properties are easy to control. The prepared powder coating has incomparable advantages in terms of decoration, construction, stability and cost performance. It is widely used in household appliances, building materials, machinery manufacturing and interior products. [0003] The molec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/187C08G63/78C09D167/02C09D163/00C09D5/03
Inventor 任华仇叶云张亚曹婷婷
Owner HAIAN INST OF HIGH TECH RES NANJING UNIV
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