Characteristics of leather tanned with nano-SiO2
Characteristics of leather tanned with nano-SiO2
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DOI：
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发表时间：
2005-04
影响因子：
0.9
通讯作者：
H. Fan;Li Ling;B. Shi;Qiang He;B. Peng
中科院分区：
文献类型：
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作者：
H. Fan;Li Ling;B. Shi;Qiang He;B. Peng
为了提高皮革的水热稳定性，在特定的触发条件下，引入了一种可以原位生成纳米二氧化硅的纳米前驱体。为了阐明纳米二氧化硅与蛋白质的反应及其对蛋白质性质的影响，以胶原蛋白为模型进行了详细的研究。红外光谱（FTIR）结果表明，在有机-无机纳米杂化物的形成过程中产生了两个新的化学键。一种可能是由四乙氧基硅烷水解形成的纳米二氧化硅与胶原蛋白骨架中精氨酸、组氨酸和色氨酸的-C= n基团之间的反应。在与硅醇缩合同时发生的第二个键中，胶原蛋白的悬垂羟基可能与硅- oh部分反应，并在有机相和无机相之间形成强烈的相互作用。这两种化学键似乎有助于皮革的高水热稳定性。原子力显微镜测得纳米二氧化硅的尺寸分布约为50 ~ 80 nm，未出现团聚现象。有机-无机纳米杂化能有效提高胶原蛋白在酶、酸、碱存在下的水解稳定性。当用0.3 wt %的纳米二氧化硅（基于毛皮重量）处理软化后的毛皮时，收缩温度达到95℃以上。虽然纳米二氧化硅鞣革的机械性能不如铬鞣革，但其收率、颗粒度、丰满度、柔软度、耐洗性等性能均优于铬鞣革。
A nano-precusor which can, in-situ, produce nano-SiO 2 under particular triggering condition was introduced into leather to improve the hydrothermal stability. In order to elucidate the reaction of nano-SiO 2 with proteinand how it influences the properties of the protein, collagen was used as a model in a detailed investigation. The results from FTIR (Infrared) indicated that two new chemical bonds arose during the formation of the organic-inorganic nano-hybrid. One appears to be the reaction between nano-SiO 2 formed in-situ by the hydrolysis of tetraethoxy silane and the -C=N-groups of arginine, histidine, and tryptophane in the backbone of collagen. In a second bond, occurring at the same time as the condensation of silanol proceeds, the pendent hydroxyl groups of collagen may partly react with Si-OH and form a strong interaction between the organic and inorganic phases. These two chemical bonds seem to contribute to the leather's high hydrothermal stability. The size distribution of nano-SiO 2 as determined by Atomic Force Microscopy is approximately 50-80 nm and there appeared to be no agglomeration. Organic-inorganic nano-hybrid can improve the hydrolysis stability of collagen efficiently in the presence of enzyme, acid, and alkali. When the bated pelt is treated with 0.3 wt % nano-SiO 2 (based on bated pelt weight), the shrinkage temperature reached above 95°C. Although the mechanical properties of nano-SiO 2 tanned leather are inferior to chromium tanned leather, other properties of nano-SiO 2 tanned leather, such as yield, grain, fullness and softness together with washability are all superior to chromium tanned leather.