Hydroxyl polyester resin for polypropylene primer, and preparation method and application of hydroxyl polyester resin

Abstract

The invention discloses hydroxyl polyester resin for polypropylene primer, and a preparation method and application of the hydroxyl polyester resin, and belongs to the technical field of polyester resin. The hydroxyl polyester resin for polypropylene primer is prepared from the following components in percentage by mass: 17-24% of butyl acetate, 7-10% of a polyol compound, 27-30% of hydrogenated anhydride, 38-45% of glycidyl tertiary carboxylic ester and 0.05-0.1% of a catalyst, wherein the catalyst is one or two selected from dibutyltin dilaurate and tetrabutyl ammonium bromide. The hydroxylpolyester resin for the polypropylene primer provided by the invention has good compatibility with CPP (chlorinated polypropylene), so that the double-component primer, which is used for automobile bumpers and is prepared from the hydroxyl polyester resin for polypropylene primer provided by the invention, has excellent water resistance and extremely good chemical resistance and moisture resistance. Moreover, the preparation process of the hydroxyl polyester resin for polypropylene primer is simple; no byproduct water is generated; the addition of benzene solvents are not needed for backflow;so that the hydroxyl polyester resin is safe, environmentally friendly, low in production cost and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of polyester resins, in particular to a hydroxyl polyester resin for a polypropylene primer and a preparation method and application thereof. Background technique [0002] Polypropylene (PP) plastic is widely used in automobile bumpers and interior and exterior trims due to its low density, easy molding process, and low price. However, PP is a non-polar plastic with high crystallinity, low surface tension, and is difficult to be wetted. It is difficult for the coating to adhere to the PP substrate. Usually, chlorinated polypropylene (CPP) is used to improve the coating on the PP substrate. of adhesion. Therefore, at present, most of the interior and exterior paints such as automobile bumpers use a blend of CPP and other resins as the film-forming substance of the PP primer, but CPP has a small polarity and is not compatible with many resins. The occurrence of phase separation leads to the deterioration of ...

AI Technical Summary

Problems solved by technology

However, acrylic acid grafted modified CPP resin belongs to thermoplastic acrylic resin, and the PP primer prepared by it has poor water resistance, chemical resistance and heat and humidity resistance. Therefore, how to provide a kind of good compatibility with CPP, which can give PP primer Resins with excellent water resistance, excellent chemical resistance and heat and humidity resistance are the common challenges faced by resin development engineers at present

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