Polyester resin used for TGIC curing high-toughness thermal transfer printing powder paints, and preparation method thereof

Abstract

The invention relates to a polyester resin used for TGIC curing high-toughness thermal transfer printing powder paints, and a preparation method thereof. The glass-transition temperature of the polyester resin is relatively high, so that prepared powder paint coating possesses high toughness at normal temperature and -15 DEG C. According to the preparation method, the polyester resin is obtained via melt polycondensation of following raw materials: a polyol, a polyacid, an acidolysis agent, an esterification catalyst, an antioxidant, and a curing accelerator. The preparation method comprises following steps: 1) the polyol is delivered into a reaction kettle at a needed ratio, rapid heating esterification is carried out, water is generated, and is removed via distillation; 2) temperature is increased gradually, and an obtained material is maintained to be clear; 3) sample examination is carried out; 4) one half of the antioxidant is added, and negative pressure polycondensation is carried out; and 5) cooling is carried out, one half of the antioxidant and the curing accelerator are added, stirring dispersing is carried out, and an obtained product is cooled, and is collected.

Description

technical field [0001] The invention relates to a polyester resin, in particular to a polyester resin for triglycidyl isocyanurate (TGIC) curing high-toughness thermal transfer powder coating, and also relates to a preparation method of the polyester. technical background [0002] Powder coating is a solvent-free and environmentally friendly coating that is widely used in the fields of building materials and home decoration. It has the advantages of simple preparation, efficient coating, economical and environmental protection, and superior performance. The composition of powder coating is mainly composed of main resin, curing agent, pigments and fillers and additives. Polyester resin is one of the main resins for powder coatings. It is a polymer prepolymer obtained by melt polymerization of polybasic acid and polyol. For powder coating systems, polyester resins are required to have a higher glass transition temperature (40-70°C) and certain active functional groups and fun...

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Problems solved by technology

There have also been some reports on the synthesis and preparation of polyester resins for transfer printing powder coatings. The way to improve the transfer performance of coating films in the industry is to modify polyester resins with a large amount of rigid monomers during the synthesis process; Chinese patent CN102977346A discloses A TGIC solidified weather-resistant type polyester resin for thermal transfer powder coatings, the polyester resin uses a large amount of neopentyl glycol, so it can be speculated that the surface hardness of the coating film prepared by the polyester resin is higher, but the polyester resin The mechanical properties of the prepared transfer coating film are general

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