A method for preparing composite protein filler by amino resin modification of tanning waste cow hair keratin

Abstract

The invention relates to the technical field of tanning waste resource utilization, and provides a method for preparing compound protein filler with amino resin modified tanning waste cowhair keratin. Cowhair is hydrolyzed through the combination of an oxidation method and an alkaline method, so that hydrolysis time of the cowhair is shortened, and the cowhair dissolution rate is increased; and meanwhile, amino resin is used for modifying a keratin solution obtained by means of hydrolysis, the relative molecular mass is increased, more functional groups capable of being stably combined with leather fibers and chromium ions are led in, the combining capacity of the keratin and the leather fibers is enhanced, and thus when the protein filler prepared through the method for preparing the compound protein filler with the amino resin modified tanning waste cowhair keratin is applied to tanning, the better sense property and physical and mechanical properties can be given to finished leather; and moreover, when the cowhair is hydrolyzed through the combination of the oxidation method and the alkaline method, the cowhair can be bleached, and therefore the protein filler with light colors can be obtained, and the method can be applied to filling light-color leather and bright-color leather.

Description

technical field [0001] The invention relates to the technical field of utilization of tanning waste resources, in particular to a method for preparing composite protein fillers by modifying tanning waste cow hair keratin with amino resin. Background technique [0002] With the development of clean tanning technology, the hair preservation and depilation method has gradually become one of the mainstream depilation methods in tannery. If it cannot be recycled effectively, it will also cause environmental pollution. At present, there are few examples of resource utilization of tanning waste cow hair in China, and most of them are disposed of through incineration or landfill, which wastes resources and pollutes the environment. [0003] The main component of cow hair is keratin, which is an important available resource. Hydrolyzing cow hair into keratin or polypeptide is beneficial to the resource utilization of cow hair. Because the waste cow hair produced by the hair-preserv...

AI Technical Summary

Problems solved by technology

Because the waste cow hair produced by the hair-preserving and depilatory method of tanning has undergone hair-preserving treatment, the hair-protecting effect has been produced. The keratin content of waste cow hair is more cystine, and the content of disulfide bonds is also more, which makes the chemical properties of keratin better. For stability, hydrolysis is relatively difficult, and it is difficult to achieve ideal results with a single hydrolysis method

[0004] At present, there are mainly two types of patents on the hydrolysis of cow hair. One is to use metal salts in combination with other methods to hydrolyze hair. This method requires a large amount of reagents, high cost, slow hydrolysis speed, and low hydrolysis rate; Hydrolyze with alkali, the keratin obtained by this method has dark color and small molecular weight, as a protein filler, it cannot be used for filling light-colored leather and bright-colored leather, and the selective filling and plumpness of the finished leather are poor