Decolorizing method of keratin dissolved re-crosslinked material

Abstract

The invention relates to a decolorizing method of a keratin dissolved re-crosslinked material. The decolorizing method comprises the following steps: (1) washing a colored keratin raw material, drying and shearing so as to obtain colored keratin raw material powder, adding the colored keratin raw material powder in a dissolution liquid and then reacting at the temperature of 70-120 DEG C, adding deionized water for dilution, filtering for removing residues, desalting supernate so as to obtain a clear solution, and then standing to obtain a formed keratin re-crosslinked material; and (2) adding a FeSO4 aqueous solution in the keratin re-crosslinked material, reacting for 0.5-3 hours at the temperature of 25 DEG C-35 DEG C, removing a liquid on the upper layer and then adding a H2O2 aqueous solution, and reacting for 1-5 hours at the temperature of 30 DEG C-40 DEG C so as to obtain a bleached keratin re-crosslinked material. The decolorizing method provided by the invention is simple and low in cost, has no high requirement on equipment and is suitable for large-scale production; and the material obtained by using the decolorizing method is dried to obtain the decolorized keratin regenerated material which has wide application prospect.

Description

technical field [0001] The invention belongs to the field of decolorization of keratin, in particular to a decolorization method for keratin dissolution and recrosslinking materials. Background technique [0002] Keratin waste, mainly poultry feathers and animal hair, is one of the largest biosolid wastes, and the world produces tens of millions of tons of keratin waste every year. The recycling of keratin as other materials meets the requirements of sustainable development, but most of the keratin has various colors, which affects the use effect of its recycled materials. At present, many methods have been proposed for the decolorization of keratin, but these studies mainly focus on the decolorization of natural keratin materials, and do not involve the decolorization of keratin regeneration. [0003] Li Qingxiang (Jiangsu chemical industry, the first issue in 1991) proposed decolorization research to colored feathers and black bristles, at first adopt 0.5%-1%NaOH solution...

AI Technical Summary

Problems solved by technology

[0003] Li Qingxiang (Jiangsu chemical industry, the first issue in 1991) proposed decolorization research to colored feathers and black bristles, at first adopt 0.5%-1%NaOH solution to carry out degreasing 24h, clean with 1% oxalic acid immersion process 7 days, finally use 1%-5% hydrogen peroxide bleaching for 16-18 days, the final whiteness can reach or approach natural feathers, and still maintain the original elasticity and flexibility of colored feathers, but the processing time is too long and the efficiency is low

In 2006, Zhang Shengmin, Zhang Juanjuan, etc. decolorized wool in patent CN200510104625. They first added 1% NH by weight to wool 4 OH and 0.5% H 2 o 2 , raise the temperature to 45°C-50°C in the steam heating pool, then add bleaching powder accounting for 2.5% of the total amount of wool in the second steam heating pool, heat at a constant temperature of 60°C for 60 minutes, and finally add washing powder in the third steam heating pool Sodium hexametaphosphate, fluorescent powder and whitening powder TiO 2 , maintained at 70°C for 30 minutes, centrifugal dehydration and drying to obtain decolorized wool, this process consumes a lot of energy, and at the same time it only decolorizes natural wool

Song Yongkang, Yu Hua, Yao Qinghua, Luo Qin and others published a process for decolorizing feather or feather powder degradation products in patent CN200910310716.0, which is to add sulfuric acid, hydrochloric acid, etc. Reagent, through the difference of isoelectric points of various polypeptides in the product, it is graded and separated, dried and crushed to obtain a khaki-yellow finished product. This method is simple in process, has extensive use value, and protects the environment. In this process, feather keratin is decomposed into monomer form, which cannot be regenerated into insoluble materials, and can only be used as feed fertilizer, etc., and the added value of feather utilization is low.