多羧基P(POSS-MAA)复合材料的制备及应用

Preparation and Application of Multi-carboxy P(POSS-MAA) Composite Materials

以乙烯基三甲氧基硅烷(A-171)为原料,水解缩合合成了笼型八乙烯基倍半硅氧烷(POSS-Vi),POSS-Vi与甲基丙烯酸(MAA)发生自由基聚合,制备了多羧基P(POSS-MAA)复合材料。采用核磁共振波谱(NMR),傅里叶变换红外光谱(FTIR),X射线衍射(XRD)和透射电子显微镜(TEM)对其进行了表征。结果表明,成功制备了P(POSS-MAA)复合材料,POSS-Vi均匀分散于P(POSS-MAA)复合材料中。将P(POSS-MAA)复合材料配合2%(以山羊皮酸皮质量为基准,下同)铬粉应用于山羊皮酸皮的鞣制工艺,将其作为结合鞣制与2%铬粉鞣制进行对比。结果表明,复合材料的引入有利于提高坯革的收缩温度、增厚率、降低废液中Cr2O3含量;当POSS—Vi在P(POSS-MAA)复合材料中含量为6%(以MAA的质量为基准,下同)时,结合鞣鞣制效果最好,坯革收缩温度(Ts)可达96.5℃,增厚率达36%;与铬单独鞣制对比,废液中Cr2O3质量浓度由122mg/L降低至41mg/L。

Octavinyl polyhedral oligomeric silsesquioxane(POSS-Vi) was prepared by hydrolysis and condensation of vinyl trimethoxysilane(A-171), and then a multi-carboxyl P(POSS-MAA) composite material was synthesized by the free radical polymerization of POSS-Vi and methacrylic acid(MAA). The structure of the P(POSS-MAA) composite material was characterized by nuclear magnetic resonance(NMR), Fourier transform infrared(FTIR) spectroscopy, X-ray diffraction(XRD) and transmission electron microscope(TEM). The results showed that the P(POSS-MAA) composite material was successfully obtained, and POSS-Vi was evenly distributed in the P(POSS-MAA) composite material. Subsequently, the P(POSS-MAA) composite material combined with 2%(based on mass of goat acid skin, as the below)chromium was applied to the tanning process of goat acid skin. As a result, the introduction of P(POSS-MAA) composite material could improve the shrinkage temperature and thickening rate of leather and decrease content of Cr2 O3 in the waste solution. The P(POSS-MAA) composite material containing 6%(based on the mass of MAA, as the below) POSS-Vi had the best tanning effect. The shrinkage temperature(Ts) reached 96.5 ℃ and the thickening rate was up to 36%. Compared with chrome tanning process without addition of P(POSS-MAA) composite material, the mass concentration of Cr2 O3 in the waste solution decreased from 122 mg/L to 41 mg/L.