For this research, prepared water soluble milk casein resin and waterborne polyurethane-acrylic resin. Use these resin, this article has been analyzed about change of mechanical properties by increasing amount of casein resin in polyurethane-acrylic resin on coated leather. According to measure data for solvent resistance, WPA(waterborne polyurethane-acrylic resin) resin and WPA-C1, C2, C3(samples of polyurethane-acrylic resin with milk casein resin) had good property. As known in the results, increase of casein constant did not influence to big change of hybrid resin properties. As test of tensile strength, WPA had lowest tensile characteristic(1.598 kgf/㎟) and WPA-C3 had highest tensile characteristic(1.718 kgf/㎟). Also best properties of abrasion was WPA-C3(06.021 ㎎.loss). In elongation case, WPA had best properties(754 %) in this experiment.

• 이주엽(중원대학교 방재안전공학과, 자원순환환경공학과) | Joo-Youb Lee Corresponding author
• 남상성(중원대학교 방재안전공학과, 자원순환환경공학과) | Sang-Sung Nam