Poster
Abstract
Research summary supplied by the authors
As a kind of dialdehyde polysaccharide, dialdehyde starch is widely used in leather tanning. Titanium tanning agent is also considered as a potential tanning agent. However, the tanning effect of dialdehyde starch and titanium tanning agent is not ideal. I n this study, a system of dialdehyde starch with different aldehyde group contents was prepared by the oxidation of tapioca with sodium periodate. The highest aldehyde content of tapioc can reach 93.17%. The molecular weight of dialdehyde starch decreased, while their aldehyde group content increased withincreasing dosage of sodium periodate. The degradation products of dialdehyde starch with different molecular weight were obtained by degradation. Fourier transform infrared spectroscopy (FT -IR), X -ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study the effect of composite tannery of degradation products of dialdehyde starch and titanium sulfate. Under the experimental con ditions, the leather was tanned with dialdehyde starch degr adation products, and then the leather was re -tanned with titanyl sulfate. The effect of single tanning of dialdehyde starch degradation products and combined tanning with titanium oxide sulfate on the tanning effect of sheep skin was investigated. The res ults show that the tannability of leather can be improved by combining disaldehyde -degradation products with titanyl sulfate.The shrinkage temperature of DAS combined with titanium oxide sulfate increased by 9℃ compared with that of DAS alone . The dispersi on and fixation degree of collagen fiber network of leather tanned by the combination of degraded DAS and titanium -oxysulfate were the highest, and the tanning effect was the best.