Method for producing terephthalic unsaturated polyester resin by using waste terephthalic acid

A technology for waste terephthalic acid and terephthalic acid, which is applied in the field of producing terephthalic unsaturated polyester resins with waste terephthalic acid, can solve the problems of high price of purified terephthalic acid and the like, and achieves improved hardness, The effect of reducing production costs and improving gloss

Active Publication Date: 2018-10-09
浙江东大树脂科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The price of purified terephthalic acid on the market is very expensive now, and it is urgent to find a cheap substitute, and there are a lot of very cheap waste terephthalic acid that need to be processed, but there is no more scientific and reasonable use of waste Method for producing terephthalic unsaturated polyester resin from phthalic acid

Method used

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  • Method for producing terephthalic unsaturated polyester resin by using waste terephthalic acid
  • Method for producing terephthalic unsaturated polyester resin by using waste terephthalic acid

Examples

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Embodiment 1

[0028] (1) Put 4400kg of waste terephthalic acid into 4200kg of diethylene glycol and 1400kg of ethylene glycol, and heat up to 120°C;

[0029] (2) Under the protection of nitrogen, add 8kg of composite catalyst, heat up to 190°C for esterification reaction, until the acid value of the system is lower than 10mgKOH / g; the composite catalyst is stannous oxide, dibutyl A mixture of base tin oxide and zinc acetate;

[0030] (3) When the temperature is lowered to 160°C, add 1400kg propylene glycol, 2.5kg triphenyl phosphite, 3000kg maleic anhydride and 2000kg fumaric acid, and heat up to 185°C for polycondensation until the acid value of the system is lower than 60mgKOH / g;

[0031] (4) At 202-205°C, depressurize and react until the acid value of the system is lower than 40mgKOH / g, cool down to 150°C and dilute, add 6700kg of styrene at 70-78°C, stir for 60-70 minutes, and react When the acid value of the system is 18-23 mgKOH / g, the p-phenylene type unsaturated polyester resin c...

Embodiment 2

[0034] (1) Put 4400kg of waste terephthalic acid into 4200kg of diethylene glycol and 1400kg of ethylene glycol, and heat up to 120°C;

[0035] (2) Under the protection of nitrogen, add 8kg of composite catalyst, heat up to 190°C for esterification reaction, until the acid value of the system is lower than 10mgKOH / g; the composite catalyst is stannous oxide, dibutyl A mixture of base tin oxide and zinc acetate;

[0036] (3) When the temperature is lowered to 160°C, add 1400kg propylene glycol, 2.5kg triphenyl phosphite, 3000kg maleic anhydride and 2000kg fumaric acid, and heat up to 185°C for polycondensation until the acid value of the system is lower than 60mgKOH / g;

[0037] (4) At 202-205°C, depressurize and react until the acid value of the system is lower than 40mgKOH / g, cool down to 150°C and dilute, add 6700kg of styrene at 70-78°C, stir for 60-70 minutes, and react When the acid value of the system is 18-23 mgKOH / g, the p-phenylene type unsaturated polyester resin c...

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Abstract

The invention relates to a method for recycling terephthalic acid water-washing residues, in particular to a method for producing terephthalic unsaturated polyester resin by using terephthalic acid water-washing residues. The method provided by the invention comprises the following steps: (1) throwing waste terephthalic acid into dihydric alcohol and heating to 120 DEG C; (2) adding a composite catalyst under the protection of nitrogen and performing esterification reaction at 175 to 190 DEG C until the acid value of the system is less than 10 mgKOH/g; (3) when cooling to 160 DEG C, adding dihydric alcohol, an antioxidant and unsaturated binary acid/anhydride, heating to 175 to 195 DEG C and carrying out a polycondensation reaction until the acid value of the system is less than 60 mgKOH/g; (4) performing reduced-pressure reaction at 202 to 205 DEG C until the acid value of the system is less than 40 mgKOH/g, cooling to 150 DEG C, diluting and performing reaction until the acid value of the system is 18 to 23 mgKOH/g to prepare the terephthalic unsaturated polyester resin. The product takes crude terephthalic acid as a raw material, so the production cost is greatly reduced, environment optimization is guaranteed and waste is changed into treasures.

Description

technical field [0001] The invention relates to a method for recycling terephthalic acid washing residue, in particular to a method for producing terephthalic acid unsaturated polyester resin using terephthalic acid washing residue. Background technique [0002] Terephthalic unsaturated polyester resin is a new product successfully developed in recent years. Terephthalic acid with a linear structure replaces phthalic acid to produce terephthalic unsaturated polyester resin. The carboxyl group is at the para position of the benzene ring. , the interaction is small, the chemical properties are relatively stable, so it shows good chemical corrosion resistance; at the same time, the polyester macromolecular structure is symmetrical, arranged neatly, and the dipole moment is close to zero, so it shows good electrical properties, mechanical properties and Heat resistance, its chemical corrosion resistance and heat resistance are particularly outstanding, surpassing the isophthalic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/676C08G63/78C08G63/85C08G63/83C08K5/526
CPCC08G63/676C08G63/78C08G63/83C08G63/85C08K5/526
Inventor 金春南郑怡帆周宗祥唐伟达
Owner 浙江东大树脂科技股份有限公司
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