Study on preparation of poly(lactic acid)-based waterborne polyurethane and its application in synthetic leathers
Poly(lactic acid)(PLA)-based waterborne polyurethane(WPU)was synthesized using PLA-OH and hexa-methylene diisocyanate as raw materials with different contents of 2,2-dimethylolbutyric acid(DMBA)as a hydrophilic chain extender.Then,the PLA-WPU adhesive film and ultrafine fiber synthetic leathers were prepared.The particle size of the PLA-WPU lotion decreased with an increase in the DMBA content,and however,its solid content increased.The resultant PLA-WPU superfine fiber synthetic leather also obtained an increase in the tensile strength and maximum load but a decrease in the water contact angle.The solid content of the PLA-WPU lotion containing 5.5 wt%DMBA reached 35.4%,and its particle size was 196.37 nm.In this case,the tensile strength of PLA-WPU superfine fiber syn-thetic leather was 29.9 MPa,which was as about 1.7 times as that of the superfine fiber substrate.In addition,the water contact angle of the PLA-WPU superfine fiber synthetic leather decreased to 73 ° when the DMBA content increased to 5.5%.
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NSTL
万方数据
维普
