Method for producing unsaturated polyester resin with polycarboxylic acid anhydride by-product

A polycarboxylic acid anhydride and polyester resin technology, which is applied in the field of producing unsaturated polyester resins by polycarboxylic acid anhydride by-products, can solve the problems of inability to meet performance, uneven quality, and lower prices, so as to improve resource utilization and production. The effect of high efficiency and reduction of raw material costs

Active Publication Date: 2021-04-09
ZHENJIANG UNION CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some products of this type with high performance have the disadvantage of high price. At the same time, the market competition is fierce and the quality is uneven, which cannot meet the requirements of high performance and low price. The cost of unsaturated polyester resin can be reduced. The purpose of this product price

Method used

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  • Method for producing unsaturated polyester resin with polycarboxylic acid anhydride by-product
  • Method for producing unsaturated polyester resin with polycarboxylic acid anhydride by-product
  • Method for producing unsaturated polyester resin with polycarboxylic acid anhydride by-product

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] A method for producing unsaturated polyester resin with polycarboxylic acid anhydride by-products, comprising the following steps:

[0035] Step 1: Prepare raw materials, 9 parts of polycarboxylic anhydride by-products, 7.1 parts of phthalic anhydride, 21.2 parts of maleic anhydride, 5.5 parts of ethylene glycol, and 29.1 parts of diethylene glycol; polycarboxylic acid anhydride by-products are produced by the trimethylene method Light components produced by rectification of trimellitic anhydride, including phthalic anhydride, trimellitic anhydride, benzoic acid and a small amount of other impurities.

[0036] Step 2: The unsaturated polyester is prepared by esterification and polycondensation.

[0037] Put all the raw materials in step 1 into the reactor, remove oxygen, raise the temperature to 160°C, react with water, keep it for 1 hour, then raise the temperature to 200°C at a rate of 10-15°C per hour, keep the distillation head temperature at 100°C, and maintain thi...

Embodiment 2

[0041] A method for producing unsaturated polyester resin with polybasic carboxylic acid anhydride by-product, comprises the following steps:

[0042] Step 1: Prepare raw materials, polycarboxylic acid anhydride by-product 15.6 parts, solid maleic anhydride 20.5 parts, propylene glycol 11.6 parts, diethylene glycol 24.3 parts; polycarboxylic acid anhydride by-product is trimellitic anhydride produced by trimellitic anhydride The light components produced by rectification include phthalic anhydride, trimellitic anhydride, benzoic acid and a small amount of other impurities.

[0043] Step 2: The unsaturated polyester is prepared by esterification and polycondensation.

[0044] Put the by-products of polycarboxylic acid anhydride, propylene glycol, and diethylene glycol in step 1 into the reactor, remove oxygen, raise the temperature to 160°C, react with water, and keep it for 1 hour, then raise the temperature to 205°C at a rate of 10-15°C per hour , keep the distillation head ...

Embodiment 3

[0048] A method for producing unsaturated polyester resin with polycarboxylic acid anhydride by-products, comprising the following steps:

[0049] Step 1: Prepare raw materials, 11.6 parts of polycarboxylic anhydride by-products, 4.6 parts of phthalic anhydride, 25.2 parts of fumaric acid, 4.4 parts of propylene glycol, 5.7 parts of ethylene glycol, 24.3 parts of diethylene glycol; Trimethylbenzene method produces trimellitic anhydride light components produced by rectification, including phthalic anhydride, trimellitic anhydride, benzoic acid and a small amount of other impurities.

[0050] Step 2: The unsaturated polyester is prepared by esterification and polycondensation.

[0051] Put all the raw materials in step 1 into the reactor, remove oxygen, raise the temperature to 160°C, react with water, keep it for 1 hour, then raise the temperature to 210°C at a rate of 10-15°C per hour, keep the distillation head temperature at 100°C, and maintain this temperature to carry out...

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Abstract

The invention discloses a method for producing unsaturated polyester resin with polycarboxylic anhydride by-products: raw materials are prepared, 5-20 parts of polycarboxylic anhydride by-products, 0-10 parts of phthalic anhydride, maleic anhydride or fumadiene 16-22 parts of acid, 30-38 parts of dihydric alcohol; unsaturated polyester is obtained by esterification and polycondensation of raw materials; unsaturated polyester and styrene are diluted to obtain liquid unsaturated polyester resin. The unsaturated polyester resin produced by the method of the present invention maintains the same relevant properties as the existing similar products, and the mechanical properties of the resin are at least equivalent after curing, especially the tensile elongation at break, load heat distortion temperature, and Bakery in physical properties. The hardness has been greatly improved; the waste polycarboxylic acid anhydride by-products are reused to partially or completely replace phthalic anhydride, which improves resource utilization and reduces raw material costs, operating costs of production enterprises and other costs; the production efficiency is high, and the energy consumption is low. reduced to a certain extent.

Description

technical field [0001] The invention relates to a method for producing unsaturated polyester resin, in particular to a method for producing unsaturated polyester resin with polycarboxylic acid anhydride by-products. Background technique [0002] The by-product of polycarboxylic acid anhydride is trimellitic anhydride produced by the trimellitic method, and the light components produced by rectification are mainly phthalic anhydride, trimellitic anhydride, benzoic acid and a small amount of other impurities. The previous treatment methods for this kind of light components were mainly entrusted incineration treatment or rectification treatment. The resource utilization rate is very low, the energy consumption is high, and the treatment cost is high. [0003] Unsaturated polyester resin is a general-purpose thermosetting polymer material, which is widely used in the production of products reinforced with glass fiber, aluminum hydroxide, calcium carbonate, silicon dioxide, etc.,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/676
CPCC08G63/676
Inventor 孙志坚吴荣泰汤继俊
Owner ZHENJIANG UNION CHEM IND
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