Cleaner production method of ecological tanning of Tan sheep skin

Abstract

The invention discloses a cleaner production method of ecological tanning of Tan sheep skin, comprising the steps of preparation prior to tanning, degreasing, soaking in water, fleshing, degreasing, soaking in water, softening and pickling, tanning, neutralizing, wet grinding and oxidizing washing, fat liquoring, neutralizing, outputting skin and standing and clearing up. The softening and pickling comprises the following steps: edible salt, formic acid and water are mixed to obtain first mixed solution; fur fatting agent and softening enzyme are added into the first mixed solution and mixed uniformly to obtain softened pickling solution and the softened pickling solution is heated to 48 DEG C; a Tan sheep skin is put in the softened pickling solution in a drum, softening enzyme is added into the softened pickling solution again, the drum rotates continuously for 6 hours and the softened pickling solution is filtered. The tanning comprises the following steps: the filtered softened pickling solution is put again in the drum in which the Tan sheep skin is put, formic acid solution and sulfuric acid solution are added into the filtered softened pickling solution and the drum is rotated; edible salt, formic acid, white tanning agent and water are mixed to obtain second mixed solution and the drum is rotated continuously; sodium formate, bicarb and soda ash are added for alkali adjustment; then the tanning of the Tan sheep skin is finished.

Description

Technical field: [0001] The invention relates to the technical field of animal fur processing, in particular to a clean production method for ecological tanning of sheepskin. Background technique: [0002] Existing Tan sheepskin tanning process mainly contains following several kinds: chrome tanning method, aluminum tanning method. The disadvantages of the chrome tanning method are that the skin yield is small, the skin board is thicker, hair loss occurs, and the chrome tanning waste liquid pollutes the environment; the disadvantages of the aluminum tanning method are that the neutral salt in the waste liquid pollutes the environment, aluminum salt and collagen The fibers are not bonded firmly and damage the fur. [0003] However, the unique fur in some regions requires a special tanning process to ensure the unique characteristics of the fur. For example, the tanning process of Ningxia Tan sheepskin is currently tanned with aldehyde tanning process so as not to lose the tr...

AI Technical Summary

Problems solved by technology

The disadvantages of the chrome tanning method are that the skin yield is small, the skin board is thicker, hair loss occurs, and the chrome tanning waste liquid pollutes the environment; the disadvantages of the aluminum tanning method are that the neutral salt in the waste liquid pollutes the environment, aluminum salt and collagen The fiber bond is not strong and damages the fur

[0003] However, the unique fur in some regions requires a special tanning process to ensure the unique characteristics of the fur. For example, the tanning process of Ningxia Tan sheepskin is currently tanned with aldehyde tanning process so as not to lose the true color of Tan sheepskin. The performance of fur tanned with formaldehyde The unique "nine bends" style of Tan sheepskin is well maintained, but the residual formaldehyde is harmful to the human body and pollutes the environment. At the same time, it causes inconvenience to the export of Tan sheepskin manufacturers. Nitrogen is less than 30ppm, and the formaldehyde and azo content of aldehyde-tanned Tan sheepskin is 10 times higher than the EU standard, making it difficult to export Tan sheepskin to Europe

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