Method for preparing protein filling agent from organic phosphate and chitosan modified keratin

Abstract

The invention relates to the technical field of leather waste resource utilization, and provides a method for preparing a protein filling agent from organic phosphate and chitosan modified keratin. The method comprises the steps that animal fur is hydrolyzed through an alkali-reducing agent combined method, then, organic phosphate and chitosan are used for modifying obtained keratin, the relative molecular mass of the keratin is increased, and the crosslinking behavior and antibacterial and antifungal properties of the protein filling agent are improved, so that when the protein filling agent prepared by the method for preparing the protein filling agent from the organic phosphate and the chitosan modified keratin is applied to leather making, obtained leather is flat, fine, soft and full in grain surface, bright in color and good in antibacterial and antifungal property.

Description

Technical field [0001] The invention relates to the technical field of resource utilization of tannery waste, in particular to a method for preparing a protein filler from organic phosphine and chitosan modified keratin. Background technique [0002] The toxic substances in tannery wastewater mainly come from the sulfur-containing wastewater generated in the dehairing process. The COD in it is more than 10,000 mg / L, accounting for about 40% of the total load of tanning wastewater, and the sulfur content is as high as 5500 mg / L, accounting for the total tanning wastewater The sulfur content is about 90%. Therefore, the use of hair-preserving hair removal method instead of depilation method to achieve clean hair removal process is the root of reducing pollution in the leather industry. Although the hair preservation depilation method can reduce the organic content in the tannery wastewater and reduce the waste water treatment cost, the preservation depilation method will produce a ...

AI Technical Summary

Problems solved by technology

There are two main methods for producing keratin from animal 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; One type is directly hydrolyzed 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. Moreover, protein fillers have poor binding properties and are prone to mildew, which reduces the efficiency of retanning and filling, is not conducive to the preservation of finished leather, and has low practicability