The aqueous polyurethane modified by epoxide resin(WPUE) was prepared with trimethylolpropane(TMP) as cross linker

then epoxide-acrylate-polyurethane(WPUEA) hybrid dispersions were synthesized by free-radical emulsion polymerization which were carried out by using azodiisobutyronitrile (AIBN) as initiator and methyl methacrylate (MMA) as monomerThe WPUEA hybrid dispersions were characterized with FT-IR

gel permeation chromatography (GPC)

Malvern particle size analyzer and TEMThe influences of the total mole ratio of NCO/OH

the type and amount of epoxide resin

the amounts of TMP and MMA on the properties of the hybrid dispersions and the coating films were studiedThe experimental results showed the WPUEA hybrid emulsions had better properties at total mole ratio of-NCO/OH 12—15

TMP 4%—8％

E20 4％—6％

MMA 10%—30%At the same time

the coating films of WPUEA showed such better properties as:hardness 073

gloss 85

surface drying time 30 min

freezing and thawing cycle above 5The water resistance and solvent resistance of the films of WPUEA were improvedThe modified WPUEA hybrid emulsions could substitute for solvent polyurethane.