A kind of silicate composite alkali expansion agent and preparation method thereof

Abstract

The invention discloses a silicate compound alkali swelling agent. A preparation method comprises the following steps: adding 0.5 to 5 parts of enzyme activity stabilizer into an alkali protease liquid; adding a mixture of the enzyme activity stabilizer and the alkali protease liquid into a mixed system of a silicate and an organic amine according to the ratio of 1:1; and evenly stirring, thereby obtaining the silicate compound alkali swelling agent of which the pH is between 11.0 and 13.0, the solid content is between 5% and 10%, the enzyme activity in the liquid is between 80mu / mL and 100mu / mL and the drop-out value of the enzyme activity is less than 10% after being stored at a room temperature for 180 days. The prepared silicate compound alkali swelling agent has a good swelling effect and cannot generate sludge pollution. The adopted materials are wide in source and low in cost. The silicate compound alkali swelling agent can be prepared by the existing instruments and equipment in a leather chemical factory and is mature in process. Thus, the silicate compound alkali swelling agent is easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of leather chemical materials and preparation thereof, and in particular relates to a silicate composite alkali expansion agent containing silicate, alkaline protease, organic amine and enzyme activity stabilizer and a preparation method thereof. Background technique [0002] As we all know, the looseness of collagen fibers directly determines whether the leather chemical materials used in each process of tanning can smoothly enter the bare hide fibers and evenly act on the skin collagen, and liming is the main process to complete the loose collagen fibers. The traditional lime liming method has the characteristics of low cost, easy to obtain materials, and easy operation, so it has been widely used by tanneries. However, due to the problems of low solubility, poor suspension stability, and difficulty in infiltration of lime itself, it is easy to produce a large amount of difficult-to-handle sludge after the...

AI Technical Summary

Problems solved by technology

And when the pH of the expansion system is higher than 12, as the pH further increases, the alkali expansion agent will cause excessive expansion of the bare hide, and at the same time, excessive hydrolysis will also occur, resulting in a decline in the mechanical properties of the finished leather and a decrease in Sensory properties such as fullness and filling of finished leather