蓖麻油改性两性聚氨酯复鞣剂的制备及应用  

Preparation and application of castor oil modified amphoteric polyurethane retanning agent

作　　者：王学川 蓝晓梅[1,2] 朱兴 刘新华 孙思薇 WANG Xuechuan;LAN Xiaomei;ZHU Xing;LIU Xinhua;SUN Siwei(College of Bioresources Chemical and Materials Engineering,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China;Institute of Biomass&Functional Materials,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China;College of Chemistry and Chemical Engineering,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China)

机构地区：[1]陕西科技大学轻工科学与工程学院,陕西西安710021 [2]陕西科技大学生物质与功能材料研究所,陕西西安710021 [3]陕西科技大学化学与化工学院,陕西西安710021

出　　处：《精细化工》2021年第6期1220-1226,1278,共8页Fine Chemicals

基　　金：“十三五”国家重点研发计划(2017YFB0308500);国家自然科学基金(2207081675)。

摘　　要：以异氟尔酮二异氰酸酯和聚四氢呋喃二醚醇为原料、2,2-二羟甲基丙酸为阴离子扩链剂、N-甲基二乙醇胺为阳离子扩链剂,制备了两性聚氨酯乳液,接着使用蓖麻油改性两性聚氨酯得到产物(COWPU)。通过FTIR对其进行了表征,采用纳米粒度及zeta电位仪对COWPU乳液的粒径及等电点进行了测试,采用TG对COWPU膜进行了热性能测试。随后将其用于有机无铬鞣剂TWS鞣制绵羊皮服装白湿革的复鞣工序。结果表明,COWPU已成功制备,具有显著的两性特征(等电点为6.29)和良好的生物降解性[5日生化需氧量(BOD_(5))与化学需氧量(COD)的比值为0.37],经COWPU复鞣后的坯革的撕裂强度为43.15 N/mm,抗张强度为9.99 MPa,均优于市售两性丙烯酸复鞣剂复鞣后的坯革。此外,COWPU还对坯革有一定的柔顺作用,有望实现复鞣-加脂一体工艺。Amphoteric polyurethane emulsion was prepared by using isophorone diisocyanate and polytetrahydrofuran diether alcohol as raw materials, 2,2-dimethylolpropionic acid as anionic chain extender and N-methyldiethanolamine as cationic chain extender. Then, the product(COWPU) was obtained by modifying amphoteric polyurethane with castor oil. The particle size and isoelectric point of COWPU emulsion were measured by nano particle size and Zeta potentiometer. The thermal properties of COWPU film were tested by TG. Then, COWPU used in retanning process of white wet sheepskin garment leather with organic chrome-free tanning agent TWS. The results showed that COWPU was successfully prepared and had significant amphiprotic characteristics(isoelectric point of 6.29) and good biodegradability [5-day biochemical oxygen demand(BOD_(5))/chemical oxygen demand(COD) = 0.37]. The tear strength(43.15 N/mm) and tensile strength(9.99 MPa) of the leather retanned by COWPU were better than those of the leather retanned by commercially available amphoteric acrylic retanning agent. In addition, COWPU possessed a certain softening effect on leather, which had the potential to realize an integrated process of fatliquoring and retanning.

关 键 词：蓖麻油 改性 两性聚氨酯 无铬鞣皮革 复鞣剂 皮革化学品 

分 类 号：TS529.2[轻工技术与工程—皮革化学与工程]