Ultralow-temperature epoxy cured polyester resin and preparation method thereof

Abstract

The invention discloses ultralow-temperature epoxy cured polyester resin and a preparation method thereof. The formula comprises the components in parts by mass: 1-5 parts of core monomer dipentaerythritol, 0.08-0.12 part of a catalyst, 30-55 parts of polybasic acid, 30-42 parts of polyhydric alcohol, 10-25 parts of end-capping acid, 0.01-0.12 part of an antioxidant and 1-5 parts of a curing accelerator. The product obtained by adopting the formula provided by the invention has a hyperbranched structure and relatively low viscosity, is beneficial to melt flow curing, realizes low-temperature curing, and has excellent impact property and high leveling grade; according to the preparation method disclosed by the invention, alcohol with six functional groups is firstly introduced as a core monomer, a part of polyatomic acid is firstly added, and then the polyatomic alcohol and the rest of polyatomic acid are added, so that the product obtained by the method has a certain hyperbranched structure, and is good in impact resistance and high in leveling grade.

Description

technical field [0001] The invention relates to the field of coating chemistry, in particular to an ultra-low temperature epoxy-cured polyester resin and a preparation method thereof. Background technique [0002] As a kind of solid coating, powder coating still has some problems compared with conventional coatings: 1. Its baking and curing temperature is too high, which makes the user to invest a huge amount of baking equipment and energy when spraying and baking. 2. The higher baking temperature also limits the application fields of powder coatings. For example, at such a high baking temperature, heat-sensitive substrates such as medium density fiberboard (MDF), wood, and plastic cannot be coated and baked; 3. Due to the relatively high viscosity of powder coatings, it is difficult to obtain a thickness of 40 μm, which will As a result, the overall effect of the coating is not as good as that of liquid paint. Therefore, it is of great significance to develop low-temperat...

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Problems solved by technology

[0002] As a solid coating, powder coatings have some problems compared with conventional coatings: 1. The temperature of baking and curing is relatively high, which makes the use of Manufacturers have to invest a huge amount of paint baking equipment and energy when spraying and baking; 2. Higher baking temperature also limits the application field of powder coatings

Patent CN101735432B has reported that the glass transition temperature of synthetic polyester in US5262510 and US563765 is too low, the viscosity is relatively high, and it is easy to oxidize after adding unsaturated monomers to synthesize polyester with suitable glass transition temperature, softening point, viscosity and storage Stable mixed powder uses polyester resin cured at low temperature at 160°C; although low temperature curing is achieved, the impact performance and surface leveling level of the cured powder are not high. Ultra-low temperature solidified powder with excellent impact performance and high surface leveling level, this invention solves such problems

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