【摘要】 蓖麻油经马来酸酐酯化得到羟基官能度为2.0～2.2的改性蓖麻油(MCO),将其作为多元醇成分与异佛尔酮二异氰酸酯(IPDI)、聚乙二醇1000(PEG1000)和二羟甲基丙酸(DMPA)等反应合成脂肪族耐光型聚氨酯复鞣填充剂(CPUF)。重点探讨了MCO/PEG1000、加料顺序、反应温度、DMPA用量和中和剂对乳液稳定性的影响。利用IR对聚氨酯复鞣剂的结构进行了表征。确定了工艺过程:改性蓖麻油首先同IPDI在70℃预聚40min,然后加入PEG1000和DMPA在80℃扩链100 min生成羟基终端的聚氨酯,其中m(MCO)∶m(PEG1000)=1∶1;中和剂选择三乙胺,聚氨酯复鞣剂中—COOH的质量分数为4%～5%。更多还原

【Abstract】 A new type of polyurethane retanning agent(CPUF) with excellent lightfastness was synthesized by the reaction of maleic anhydride modified castor oil(MCO) with hydroxyl functionality of 2.0～2.2i,sophorone diisocyanate(IPDI),poly(ethylene glycol)(PEG1000) and dimethylol propionic acid(DMPA).The effects of MCO/PEG1000,addition sequence,reaction temperatures,concentration of DMPA and neutralizer on the stability of CPUF emulsion were investigated.Fourier transform infrared spectroscopy(IR) was utilized to characterize CPUF structure.A preferred synthesis process was given as follows:MCO and IPDI prepolymerized at 70℃ for 40min,then chain extended with PEG1000 and DMPA at 80℃ for 100 min to get a hydroxyl terminated polyurethane,TEA was chosen neutralizer,m(MCO)∶m(PEG1000)=1∶1,the total content of —COOH was 4%～5%.更多还原