Unsaturated polyester resin for molding compound of auto parts and manufacturing method thereof

Abstract

The invention relates to a high molecular compound, in particular to an unsaturated polyester resin for molding compound of auto parts, which is prepared by dissolving a reaction product of the condensation reaction of propylene qlycol, diethylene qlycol, dipropylene glycol, phthalic anhydride and cis-butenedioic anhydride into styrene after the condensation reaction is completed. The invention has the advantages that: (1) the resin has good water resistance and flexibility through optimization combination on the premise that the cost of raw materials of the resin is not greatly increased, and products made of the resin have good anti-wet capacity and good mechanical property; (2) the reactivity of the resin is greatly enhanced so as to ensure that the surface of molding compound productsafter hot press molding has higher luster; (3) the resin is used together with a proper low-profile agent, and enables produced products to achieve zero shrinkage so as to ensure the accuracy of the size of the products; and the resin also can be used together with low-shrinkage agents in polystyrene so as to enhance stainability of the products; and (4) the reaction time can be shortened as wellas the energy consumption and the manufacturing cost of the resin can be reduced by adopting phthalic anhydride.

Description

1. Technical field [0001] The invention belongs to the field of macromolecule chemical industry, and in particular relates to unsaturated polyester resin used for molding materials. 2. Technical Background [0002] After decades of development, FRP products have changed from traditional manual production to highly mechanized molding production, and the production efficiency and product quality stability have been greatly improved. Of course, there are also requirements for unsaturated polyester resin. Very demanding. Most of the resins originally used for hand lay-up cannot meet the requirements of molding, such as insufficient reactivity of the resin, excessive shrinkage of the resin after curing, poor compatibility between the resin and the low-shrinkage agent, and so on. So so far, some resin production enterprises or research units have also developed unsaturated resins for different purposes according to the requirements of the molding process. From the raw materials ...

AI Technical Summary

Problems solved by technology

From the raw materials (mainly from the dibasic acid or dibasic anhydride used), these resins can be divided into isophthalic and orthophthalic types. The dibasic acid used in isophthalic resins is isophthalic acid, and the reaction time is longer, plus The price of isophthalic acid is high, and it is not widely used in China at present; the ortho-phthalic resin uses phthalic anhydride, the reaction time is moderate, and the price of phthalic anhydride is much lower than that of isophthalic acid , so the ortho-phthalic resins are mainly used in China, but the quality of the ortho-phthalic resins is not good, and the gap with the iso-phthalic resins is obvious, especially the use of high-demand auto parts is limited.

On the other hand, the currently used low-shrinkage agent is mainly formed by dissolving polystyrene into styrene. Its advantage is that it can improve the colorability of the resin, but the shrinkage rate of the control product cannot reach the desired value ( Less than one thousandth), so it cannot be used to produce and manufacture products that require high dimensional accuracy in the automotive field

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