Polyester resin for triglycidyl isocyanurate (TGIC)-cured weather-resistant heat transfer printing powdery paint and preparation method thereof

Abstract

The invention discloses a polyester resin for a triglycidyl isocyanurate (TGIC)-cured weather-resistant heat transfer printing powdery paint. The polyester resin is prepared by a melt polycondensation reaction of 35 to 40wt% of one or more polyhydric alcohols, 48 to 55wt% of one or more aromatic polybasic acids, 0 to 2wt% of an alicyclic polyol, 0 to 2wt% of one or more alicyclic polybasic acids, 0 to 2wt% of a branching agent, 8 to 15wt% of one or more acidolysis agents, 0.05 to 0.20wt% of an esterification catalyst, 0 to 0.5wt% of one or more main antioxidants, 0 to 0.5wt% of one or more auxiliary antioxidants, and 0 to 0.5wt% of a curing accelerator. The invention also discloses a preparation method of the polyester resin for the TGIC-cured weather-resistant heat transfer printing powdery paint. The polyester resin has a high glass-transition temperature, a high softening point, appropriate melt viscosity and appropriate storage stability. The powdery paint prepared from the polyester resin has excellent heat transfer printing effects, realizes clear heat transfer printed patterns, does not adhere to a transfer paper and realizes easy tearing of the transfer paper.

Description

technical field [0001] The invention relates to a polyester resin, in particular to a triglycidyl isocyanurate (TGIC)-cured polyester resin for weather-resistant thermal transfer powder coatings, and secondly, the invention also relates to a preparation method of the polyester resin. Background technique [0002] With the improvement of people's living standards, the home decoration market is also booming. Natural wood and stone are the best decoration materials, but due to the demand for environmental protection and the scarcity of resources, it is difficult for people to obtain enough natural decoration materials, so people actively To explore other new materials, aluminum alloy has become the best choice for people due to its light weight, good durability, easy processing and reasonable price, which has promoted the vigorous development of the aluminum profile market. At present, aluminum profiles are mainly coated with powder coatings. Engineering Technicians study how t...

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Problems solved by technology

[0003] Chinese patent CN101704945A discloses polyester resin for hybrid powder coating and its preparation method. This patent mainly discusses the formula and preparation method of polyester resin for hybrid thermal transfer powder coating. Weather-resistant monomers such as formic acid and isophthalic acid and some ethylene glycol and diethylene glycol are non-weather-resistant and low-cost monomers. The polyester resin synthesized by this patent has an acid value of 50-75mgKOH / g and a viscosity of 2000-3500mPa. s. The glass transition temperature is 53-57°C, but due to the obvious difference between the indoor hybrid polyester resin and the outdoor polyester resin in the selection of formula monomers and the characteristic parameters of the resin, such as glass transition temperature and aging performance, etc., so hybrid polyester resins cannot be used outdoors, but the formula and process of this patent can provide a certain reference for the synthesis of polyester resins for TGIC curing thermal transfer powder coatings

In addition, although the commonly used polyester resins for weather-resistant powder coatings are widely used in outdoor air conditioners, hardware, guardrails, etc., when they are used to make thermal transfer powder coatings, they usually have difficulty in tearing paper, heavy surface adhesion, and heat transfer. Due to the shortcomings of easy yellowing during printing, it cannot be used in batches. The problem is that the molecular structure of conventional polyester resins cannot meet the requirements of polyester resins for thermal transfer powder coatings.

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