Study on the Preparation of Powder Coatings by Precipitation Antisolvent Technology of SC-CO_2 (Ⅱ)——Preparation of Powder Coatings from SC-CO_2 Containing Solution by Precipitation Antisolvent Technology
In this paper,the solution(compositions:epoxy/polyester resin of 40%(mass),toluene of 40%(mass),CO2 of 20%(mass)) is atomized into an autoclave (with pressure of 10 MPa,temperature of 35 ℃,inner diameter of 50 mm and height of 1 600 mm) through nozzle (with pore diameter of 0.4 mm,pore depth of 0.5 mm,and cone angle of 45° and 1 mm cone depth) at the pressure of 22 MPa and the temperature of 70 ℃,and epoxy/polyester powder coatings are obtained with average diameter of 65 μm.The coatings can comply with the...