Production technology of high-absorbability chrome tanned leather

Abstract

The invention discloses a production technology of high-absorbability chrome tanned leather. The production technology comprises following steps: raw materials are softened, and are restored to be in the fresh skin state, not-required components in fur machining are removed, according to a full-depth limed skin, a first layer and a second layer are separated through the splitting working procedure, and the second limed skin is put into a tanning drum to be subject to deliming, softening and pickling; 80% of water is added, and the temperature is controlled to 22 DEG C; 8% of salt is added, and rotating is carried out for 10min; 150% of water is continuously added, and the temperature is controlled to 45 DEG C; 0.6% of formic acid is added, and rotating is carried out for 30 min; 2% of glyoxylic acid is added, and rotating is carried out for 30 min; 0.4% of sulfuric acid is added, rotating is carried out for 120 min, and the PH value is controlled to range from 3.0 to 3.2 until core penetrating is achieved; 4% of a chrome tanning agent is added; 0.15% of a mildew preventive is added, and rotating is carried out for 180 min; 0.45% of a leather basifying agent is added, rotating is carried out for 360 min, and the PH value is controlled to range from 4.0 to 4.2; the composite mixing technology is achieved; household leather is dyed; emulsion is oiled.

Description

Technical field [0001] The invention relates to a production process of high-absorption chrome tanned leather, which belongs to the production process of furniture leather. Background technique [0002] In this era of increasing emphasis on ecology and environmental protection, the tanning industry will face severe challenges. The domestic leather industry actively promotes the leather mark ecological leather certification and stipulates that the content of related chemical substances that may exist in ecological leather must be strictly controlled within a limited range Inside. [0003] The chrome tanned household leather in the prior art uses a large amount of chrome tanning agent. Although the traditional chrome tanning method has an irreplaceable position, it still has shortcomings. Chromium is a non-renewable resource. Although trivalent chromium is used for chrome-tanned leather, trivalent chromium can be converted into hexavalent chromium under certain conditions, which is ...

AI Technical Summary

Problems solved by technology

[0003] The chrome-tanned home leather in the prior art requires a large amount of chrome tanning agent. Although the traditional chrome-tanning method has an irreplaceable position, there are still deficiencies.

Chromium is a non-renewable resource. Although trivalent chromium is used for chrome tanning, trivalent chromium can be converted into hexavalent chromium under certain conditions. Hexavalent chromium is highly toxic.

The absorption of chromium in the modern chrome tanning process is up to 70% to 80%, and the content of chromium trioxide (Cr2O3) in the chromium waste liquid is as high as 3.0-5.0g / L, which not only causes waste of chromium resources, but also increases the degree of environmental pollution and Waste liquid treatment burden

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