Special high-performance carboxyl-terminated polyester resin for powder coating and synthesis method thereof

Abstract

The invention discloses special high-performance carboxyl-terminated polyester resin for a powder coating and a synthesis method thereof. The invention solves the problems that in the prior art, the outdoor powder coating, which is prepared by taking TGIC as a curing agent, has the curing condition of 200 DEG C * 10 minutes or above, and the curing condition of the indoor powder coating taking theepoxy resin as the curing agent is 180 DEG C * 10 minutes, wherein the excessive high curing temperature may cause serious waste of energy resources and long baking time, and further causes long production period and increase on equipment and manpower cost. In the invention, the polyester resin monomer for preparing the powder coating is improved and optimized, so that the polyester resin with good stability, the powder coating can be cured at a relatively low temperature, and the application range of the powder coating can be expanded through low-temperature curing; meanwhile, the processingefficiency can be improved, the production cost is greatly reduced, and the problem that the powder coating synthesized through traditional polyester resin is prone to causing a large amount of energy waste is solved.

Description

technical field [0001] The invention relates to the technical field of powder coatings, in particular to a special high-performance carboxyl-terminated polyester resin for powder coatings and a synthesis method thereof. Background technique [0002] Thermosetting powder coatings are widely used at home and abroad because of their pollution-free, resource-saving and high-efficiency characteristics. Performance requirements are getting higher and higher. Polyester resins for powder coatings are saturated resins. According to their terminal functional groups, they can be roughly classified into two types: hydroxyl-terminated polyester resins and carboxyl-terminated polyester resins. The former has a hydroxyl value between 30 Between -300mgKOH / g, caprolactam-blocked isocyanate is generally used as the curing agent of its powder coating, which can achieve excellent weather resistance and corrosion resistance, and has a very broad prospect. The powder coating based on carboxyl-ter...

AI Technical Summary

Problems solved by technology

[0004] The first object of the present invention is to provide a special high-performance carboxyl-terminated polyester resin for powder coatings, which aims to improve the existing outdoor powder coatings prepared with TGIC as a curing agent. The curing conditions are all above 200 ° C × 10 minutes to The curing condition of indoor powder coatings with epoxy resin as curing agent is 180°C×10 minutes. The curing temperature is too high, resulting in a lot of waste of energy, and long baking time, which makes the production time cycle longer and increases the cost of equipment and manpower. The problem

Images