Ding Wei, Yi Yudan, Wang Ya-Nan, Zhou Jianfei, Shi Bi
National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu, 610065, PR China; China Leather and Footwear Research Institute Co. Ltd., Beijing, 100015, PR China.
Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, 610065, PR China.
Carbohydr Polym. 2019 Nov 15;224:115169. doi: 10.1016/j.carbpol.2019.115169. Epub 2019 Aug 5.
Dialdehyde carboxymethylcellulose (DCMC) solution generally has quite low solid content, which inevitably limits its industrial application. In this work, carboxymethylcellulose sodium (Na-CMC) was pre-degraded using HO followed by periodate oxidation for preparing DCMC with high solid content as practical tanning agent. Pre-degradation conditions optimization showed that HO dosage most impacted the tanning effect of DCMC, and the M and viscosity of Na-CMC underwent remarkable reduction. FT-IR and H NMR illustrated that aldehyde group was successfully introduced into DCMC after periodate oxidation. Under the optimized conditions, the solid content of DCMC could be improved to around 30%. This DCMC could endow tanned leather with high shrinkage temperature and satisfactory fiber dispersion. Besides, DCMC tanned leather had comparable physical and organoleptic properties to those of leathers tanned by chrome tanning agent and commercial polyaldehyde tanning agent TWT. This suggests the prospect of DCMC with high solid content as useful tanning agent.
双醛羧甲基纤维素（DCMC）溶液的固含量通常相当低，这不可避免地限制了其工业应用。在这项工作中，羧甲基纤维素钠（Na-CMC）先用HO进行预降解，然后用过碘酸盐氧化，以制备具有高固含量的DCMC作为实用的鞣剂。预降解条件优化表明，HO用量对DCMC的鞣制效果影响最大，Na-CMC的分子量和粘度显著降低。傅里叶变换红外光谱（FT-IR）和核磁共振氢谱（¹H NMR）表明，过碘酸盐氧化后醛基成功引入到DCMC中。在优化条件下，DCMC的固含量可提高到30%左右。这种DCMC能赋予鞣制皮革高收缩温度和令人满意的纤维分散性。此外，DCMC鞣制皮革的物理和感官性能与铬鞣剂和商业聚醛鞣剂TWT鞣制的皮革相当。这表明高固含量DCMC作为有用鞣剂的前景。
