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Method for producing unsaturated polyester resin by using polycarboxylic anhydride by-product

A polycarboxylic acid anhydride and polyester resin technology, which is applied in the field of producing unsaturated polyester resin by polycarboxylic acid anhydride by-products, can solve problems such as uneven quality, inability to meet performance requirements, and lower prices, so as to achieve high production efficiency and increase resources. Effectiveness of utilization rate and reduction of raw material cost

Active Publication Date: 2019-04-19
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 by using polycarboxylic anhydride by-product
  • Method for producing unsaturated polyester resin by using polycarboxylic anhydride by-product
  • Method for producing unsaturated polyester resin by using polycarboxylic anhydride by-product

Examples

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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 polycarboxylic acid anhydride by-products, comprising 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 Light components produced by rectification, including 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 tempe...

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 an unsaturated polyester resin by using a polycarboxylic anhydride by-product, comprising the following steps: preparing raw materials including 5-20 parts of a polycarboxylic anhydride by-product, 0-10 parts of phthalic anhydride, 16-22 parts of maleic anhydride or fumaric acid and 30-38 parts of dihydric alcohol; preparing unsaturated polyester fromthe raw materials by an esterification polycondensation method; diluting unsaturated polyester and styrene to obtain liquid-state unsaturated polyester resin. The unsaturated polyester resin producedby the method keeps relevant properties equivalent to the existing similar products, and the mechanical properties are at least equivalent after curing of the resin, and especially the tensile elongation at break, the heat distortion temperature of the load and Barcol hardness are all promoted. By reusing waste polycarboxylic anhydride by-product to partly or completely replace phthalic anhydride, resource utilization is improved, and cost of raw material, operating cost of manufacturing enterprises and other cost are reduced. Production efficiency is high, and energy consumption is also reduced to some 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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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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