Development of Waterborne Two-component Hydroxyl Acrylic Varnish with High Gloss
In order to reduce the defects such as shrinkage and shrinkage holes of the two-component hydroxyacrylic varnish film dried at higher temperature,the effects of hydroxy value of hydroxyacrylic dispersion and polyisocyanate curing agent on the properties of paint film were studied.The factors affecting the varnish viscosity were analyzed,and the varnish formulation and the construction process were optimized.The results were as follows:1)The hydroxyacrylic dispersion with a 3.9％hydroxy value was selected;2)Three kinds of polyisocyanate components were mixed,and the components with higher water compatibil-ity were wrapped around the components with lower water compatibility to improve the appearance of the film and optimize the drying speed of the film;3)Ethylene glycol butyl ether and propylene glycol butyl ether were selected as solvents for component A,and propylene glycol diacetate was selected as dilution solvent for component B;4)In the construction process,the component A and component B were stirred evenly in advance and then deionized water was added;5)The waterborne two-component hydroxyacrylic varnish with fast drying speed and high gloss was prepared,and the performance of the varnish film was qualified.
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