【摘要】 提出了以特定尺寸天然革屑填料作为合成革聚氨酯发泡层的支撑材料，用以解决发泡涂层在烘干过程中的扁平化问题。此外，在复合涂层中，革屑还起到水汽通道及力学增强等作用。在此复合发泡层制备过程中，选取尺寸与发泡层初始厚度相仿的革屑填料，使得其能够支撑于发泡层上下两面。在干燥之后，该发泡涂层厚度保持率达到了96%,相较于纯PU发泡层提升17%。同时革屑的加入大大降低了涂层的泡孔直径与壁厚，分别达到了57与20μm,仅为纯聚氨酯发泡层的43%与24%。当m(革屑)∶m(聚氨酯)=1∶8时，成品革的透水汽性能与拉伸强度分别达到了368 mg/10 cm~2·24 h与11.45 MPa,相较于纯发泡PU合成革提升232%与85%。更多还原

【Abstract】 A specific size of natural chrome shaving filler was proposed as the support material for the polyurethane foam layer of synthetic leather to solve the problem of flattening of the foam coating during the drying process. In addition, in the composite coating, chrome shaving will also play the role of water vapor channel and mechanical enhancement. In the preparation process of the composite foam layer, the chrome shaving filler with the similar size as the initial thickness of the foam layer is selected so that it can be supported on the upper and lower sides of the foam layer. After drying, the thickness retention rate of the composite foamed coating reaches 96%, which is 17% higher than that of the pure PU foamed layer. At the same time, the addition of chrome shavings greatly reduces the cell diameter and wall thickness of the coating, reaching 57 μm and 20 μm respectively, which are only 43% and 24% of the pure PU foam layer. When m(chrome shavings)∶m(PU)=1∶8, the water vapor permeability and tensile strength of the finished leather reach 368 mg/10 cm~2·24 h and 11.45 MPa, respectively, which is 232% and 85% higher than that of pure foamed PU synthetic leather.更多还原