A kind of preparation method of wet white skin

Abstract

A kind of preparation method of wet white skin, first adjust the pH of bare skin to the vicinity of the isoelectric point of the skin, and then squeeze water; put the squeezed skin into a sealing device, add dehydrated alcohol 2-4 times the weight of the skin to carry out Dehydration, after rotating for 5-240min, recover the bath liquid; repeat the dehydration operation 2-4 times; then prepare a mixed solution with a higher polarity than ethanol, and dehydrate 1-3 times, each time the dosage is 100-400% of the tare weight, After rotating for 30-600 minutes, recover the bath liquid; finally add an acetone solution with a tare weight of 100-400%, take it out after rotating for 5-240 minutes, the water content in the skin is less than 10%, and the wet white skin is obtained. The present invention adopts a step-by-step dehydration method with increasing solvent polarity, so that the water on the surface and inside of the bare hide can be replaced slowly and evenly without being affected by the original state and thickness of the bare hide, thereby obtaining a porous fiber structure , wet white leather with good physical and mechanical properties.

Description

technical field [0001] The invention belongs to the field of leather tanning, and in particular relates to a preparation method of wet white leather. Background technique [0002] Bare hide refers to the raw animal hide that has been removed from the hair, epidermis and subcutaneous tissue, leaving only the dermis, ready for further processing. Bare hides generally include raw hides after the liming process and before the tanning process, such as delimed hides, softened hides, pickled hides, etc. Tanning is the qualitative change process of treating bare leather with tanning agents to turn it into leather, and this tanning effect must be irreversible. The tanned leather has certain moisture and heat resistance stability, certain formability, good air permeability and bending resistance, and has good use value. Different tanning methods are produced by using different tanning agents to obtain the tanned leather. For example, leather tanned with chrome tanning agent is call...

AI Technical Summary

Problems solved by technology

But for the thicker areas such as the buttocks, if you use acetone to dehydrate directly, the surface will be dehydrated too quickly, and the water inside the skin will not be easily removed, so that the dehydration effect will not be good.

Second, if acetone dehydrates too quickly, it is easy to make fiber bundles, fibers, and fibrils shrink too quickly during the dehydration process, reduce the pore structure of the fiber structure, and directly affect the physical and mechanical properties of the leather.

Third, the state of bare skin is different, resulting in the difference in water content and hydrophilicity of bare skin, which directly affects the effect of acetone dehydration

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