Anti-aging unsaturated polyester resin and preparation method and application thereof

Abstract

The invention relates to anti-aging unsaturated polyester resin and a preparation method and application thereof. The anti-aging unsaturated polyester resin is prepared from the following reactants in percentage by weight: 28-35% of dihydric alcohol, 30-50% of dicarboxylic acid or anhydride and 25-35% of thinner, wherein the dicarboxylic acid or anhydride at least comprises 1,4-cyclohexanedicarboxylic acid, and the thinner is the combination of methyl methacrylate and styrene. The preparation method of the anti-aging unsaturated polyester resin comprises the following steps: carrying out a condensation reaction on the dihydric alcohol and the 1,4-cyclohexanedicarboxylic acid until the acid value is 20-40mgKOH / g, decreasing temperature, adding maleic anhydride or fumaric anhydride, slowly increasing temperature to carry out polycondensation reaction until the acid value is 45-55mgKOH / g, reducing pressure to carry out vacuum treatment until the acid value is 25-35mgKOH / g, adding an additive, cooling and adding the thinner. The anti-aging unsaturated polyester resin is used for making artificial stone plates, basins, sanitary ware and sheet molding compound. The content of benzene rings in the unsaturated polyester resin is greatly reduced, and anti-aging performance of the anti-aging unsaturated polyester resin is improved. The anti-aging unsaturated polyester resin has higher color and mechanical performance retention rate under the condition of coexistence of high light, oxygen and water.

Description

technical field [0001] The invention belongs to the technical field of unsaturated polyester resins, and in particular relates to an aging-resistant unsaturated polyester resin and a preparation method thereof. Background technique [0002] Ordinary unsaturated polyester resins are generally made of polycondensation of phthalic anhydride, maleic anhydride and propylene glycol, ethylene glycol, diethylene glycol, etc., and diluted with styrene at the same time. It has ester bonds and unsaturated double bonds. A linear polymer compound containing a large number of benzene rings in phthalic anhydride and styrene. The unsaturated polyester resin prepared by this traditional method has poor performance in aging resistance. It is shown that the surface of the product is easy to turn yellow under the influence of strong light, oxygen, water, etc., and it is easy to have defects, which cannot meet some requirements. Application requirements in high-end places. [0003] Generally, ...

AI Technical Summary

Problems solved by technology

[0004] In traditional unsaturated polyester resins, dibasic acids generally only contain phthalic anhydride and maleic anhydride, and styrene is used as a diluent, especially artificial stone resins, which generally contain phthalic anhydride and maleic anhydride with a mass ratio of 25% or more. Phthalic anhydride, the weight ratio of aromatic materials contained in such a common resin can reach about 50%, and the net weight of benzene ring can also reach about 30%, which seriously affects the stability of product quality