Study on the Synthesis of Aqueous Polyurethane Modified with Acrylate

The aqueous polyurethane prepolymers(PU) were synthesized from isocyanate,polyether polyhydric alcohol and dimethylolpropionic acid and the aqueous polyurethane modified with acrylate(PUA) was prepared through chain extending,cross bonding and modification and hybridization with acrylate. The result showed that the tensile strength,hardness,abrasive resistance,water resistance and alcohol resistance were enhanced dramatically after the aqueous polyurethane was modified by acrylate, chain extending and cross bonding,showing that the merits of aqueous polyurethane and acrylate were combined.The performances of aqueous PUA redispersible emulsions film were improved in order to meet the demands of using aqueous PUA as wood coatings.