Abstract: Waterborne dispersion of raw lacquer(WRL) was prepared by composite emulsifier. The effects of types and the content of emulsifier, as well as the ratio of different emulsifiers on the stability of emulsion and phase inversion were investigated. The particle size, morphology and mechanical properties of the WRL film were examined by TEM and TG. It was shown that the emulsification could be improved by using composite emulsifier of OP-10/SDS/PVA and the optimum mass proportion was 7:3:10. The dispersion had a good stability, and its particle size was not more than 800 nm when the dosage of composite emulsifier reached 10% of raw lacquer by weight. The film of WRL had excellent mechanical properties, thermal-stability and resistance to chemicals and pollution. It was similar to raw lacquer. Pencil hardness, adhesion and flexibility were 4H, 2 grade and 0.5 mm, respectively. The square impact strength of the films was increased from 35 cm to 50 cm and the reverse impact strength was increased from 25 cm to 50 cm. The formation time was shortened form 4-5 to 3 days.

Key words: raw lacquer, emulsification, waterborne dispersion, property