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
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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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