端羧基超支化聚合物-铝无铬鞣剂的制备及应用

Synthesis and Application of Hyperbranched Polymer with Terminal Carboxyl groups-Al Chrome-free Tanning Agent

摘要:

根据超支化聚合物官能团度大，反应活性高的特点，利用端羧基超支化聚合物（HPAE-C）的末端羧基与Al3+络合，制备一种新型的无铬鞣剂(HPC-Al)，通过单因素实验分析方法考察了反应条件对成革收缩温度的影响，确定了最佳合成条件：m(HPAE-C)：m(Al2(SO4)3)=2：1，反应温度为30℃，反应pH为3，反应时间3h。采用IR、XRD对产品分子结构进行表征，并采用热重分析仪测试了产品的热性能，HPC-Al的热分解温度为243℃。将产品应用于皮革鞣制中，其单独鞣革收缩温度为76.6℃，铬复鞣后收缩温度大于95℃，且物理力学性能明显提高。

Abstract:

The paper uses the terminal carboxyl groups of hyperbranched polymer complexing the Al3+ in aluminum sulphate synthesis a new chrome-free tanning agent (HPC-Al). Through single-laboratory methods optimize the conditions. The molecular structure of HPC-Al was characterized and analyzed by IR and XRD. The results indicated that the reaction raw ratio was m(HPAE-C)：m(Al2(SO4)3)=2：1, pH was 3, reaction temperature was 30℃, and the time was 3h. Thermal decomposition temperature is 243℃. Application results show that: the shrinkage temperature of HPC-Al tanning leather is 76.6 ℃, The shrinkage temperature greater than 95℃ after chrome retanning，and it has greatly improved leather fullness, softness and physical- mechanical properties.