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以耐水解性较好的聚己二酸新戊二醇酯二元醇(PNA)和聚氧化丙烯二元醇(PPG)为主要起始原料,在n(PNA)/n(PPG)=8/2、n(NCO)/n(OH)=1.5、ω(二羟甲基丙酸)=5.5%和ω(三羟甲基丙烷)=0.4%的条件下与甲苯二异氰酸酯(TDI)反应,制得用于半PU合成革的水性聚氨酯(WPU)贴合料。研究了软段分子链结构、n(PNA)/n(PPG)和三羟甲基丙烷用量等对WPU贴合料的剥离强度、100%模量和耐湿热性能的影响。应用结果表明:制得的WPU贴合料可用于半PU合成革生产线,当上料量为80g/m2时,PVC与涤纶基布的贴合强度达到3.0kg/3cm,温度70℃相对湿度95%,7d后为1.9kg/3cm,满足半PU合成革产品指标。
(PNA) / poly (propylene oxide) glycol (PPG) with good hydrolysis resistance as the main starting material, Was reacted with tolylene diisocyanate (TDI) under the conditions of n (NCO) / n (OH) = 1.5, ω (dimethylolpropionic acid) = 5.5% and ω (trimethylolpropane) = 0.4% , To prepare a water-based polyurethane (WPU) paste for semi-PU synthetic leather. The effects of soft segment molecular chain structure, n (PNA) / n (PPG) and trimethylolpropane dosage on the peel strength, 100% modulus and wet heat resistance of WPU laminates were studied. The application results show that the prepared WPU laminates can be used in the semi-PU synthetic leather production line. When the feeding amount is 80g / m2, the bonding strength between PVC and polyester fabric reaches 3.0kg / 3cm, the temperature is 70 ℃ and the relative humidity is 95 %, After 7d 1.9kg / 3cm, to meet the semi-PU synthetic leather product index.