Method for stabilizing content of trivalent chromium and minimum hexavalent chrome in leather

A technology of trivalent chromium minimization, applied in leather impregnation, small raw hide/big raw hide/leather skin/fur chemical treatment, leather surface treatment, etc., to achieve the effect of low treatment cost, low price and wide source

Inactive Publication Date: 2009-09-09
西藏自治区拉萨皮革厂 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This shows that although hexavalent chromium in leather can be eliminated by using reducing agents, or the oxidation of trivalent chromium can be prevented to a certain extent by using antioxidants, this treatment method cannot be used in the long service life of leather and leather products. Prevent oxidation of trivalent chromium to hexavalent chromium

Method used

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  • Method for stabilizing content of trivalent chromium and minimum hexavalent chrome in leather
  • Method for stabilizing content of trivalent chromium and minimum hexavalent chrome in leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First weigh sodium sulfite and sodium salicylate respectively, and prepare them into aqueous solutions with a concentration of 3.0% and 0.5% respectively; 45mg / kg light gray sheepskin shoe upper leather, sprayed 3 times; then sprayed the prepared sodium salicylate aqueous solution, also sprayed 3 times; finally sprayed the sheepskin shoe upper leather after the treatment according to the meat surface of the meat surface. The method is to stack it in a normal temperature sheltered environment with a relative humidity of 45-55%. After stacking for 14 days, it can be dried and supplemented with finishing. Hexavalent chromium cannot be detected in the finished leather after treatment.

Embodiment 2

[0027] First weigh soluble starch and potassium cyclohexyl hexaphosphate respectively, and prepare them into aqueous solutions with a concentration of 2.0% and 1.5% respectively; The meat surface of the light yellow goatskin shoe upper leather with a chromium content of about 9mg / kg is sprayed twice; then the prepared aqueous solution of potassium hexaphosphate hexaphosphate is sprayed for 3 times; finally the treated goatskin shoe upper leather is sprayed Stack them in a normal temperature and wind sheltered environment with a relative humidity of 60-70% according to the meat face-to-meat mode, and after stacking for 5 days, dry and supplementary finishing process to it. Hexavalent chromium cannot be detected in the finished leather after treatment.

Embodiment 3

[0029] First weigh sucrose and ammonium citrate respectively, and prepare them into aqueous solutions with a concentration of 2.5% and 1.0% respectively; The meat side of the inner leather of beige pigskin shoes / kg is sprayed 2 times; then the prepared ammonium citrate aqueous solution is sprayed and sprayed 3 times; finally, the pigskin shoe inner leather after the spraying process is piled up in a way that the meat faces the meat side. In a normal temperature sheltered environment with a relative humidity of 65-75%, it can be dried and supplemented with finishing after stacking for 7 days. Hexavalent chromium cannot be detected in the finished leather after treatment.

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Abstract

The invention provides a method for stabilizing the content of trivalent chromium and minimum hexavalent chrome in leather, comprising the following steps: the respectively prepared water solution of reducing agent and protective solute are sprayed onto the flesh side of finished leather, the finished leather with the water solution is piled up in the wind-sheltering environment under normal temperature and invariable wetness for at least 3 days, or semi-finished leather which is operated by wet processing or finished leather which is processed by moisture regain is firstly put into the prepared water solution of reducing agent to be submerged for at least 0.25 hour and secondly put into the water solution of protective solute to be submerged for at least 0.25 hour, and the processed semi-finished leather is processed by normal working procedure. Because the method firstly adopts the reducing agent to reduce the hexavalent chrome remained in the leather into the trivalent chromium and secondly adopts the protective solute to stabilize the unconstant trivalent chromium which is uncombined or combined with collagen in a single-point way, therefore, the hexavalent chrome can not be detected in the proceed leather which, and the hexavalent chrome can not be generated or the content of the hexavalent chrome is under normal standard when the leather is naturally stored and within 10 years of using time.

Description

technical field [0001] The invention belongs to the technical field of reducing the content of hexavalent chromium in leather, and in particular relates to a method for stabilizing trivalent chromium in leather and minimizing the content of hexavalent chromium. Background technique [0002] Chromium ranks 10th in storage in the earth's crust, mainly in multiple oxidation states. In aqueous solution, chromium mainly exists in the form of trivalent chromium and hexavalent chromium, while in the air, chromium mainly exists in the form of trivalent chromium. Chromium compounds often pollute the environment in the form of solution, dust or steam, and invade the human body through the digestive tract, respiratory tract, skin and mucous membranes. Among them, trivalent chromium can participate in the metabolism of glucose in the human body and is an essential trace element for the human body. However, hexavalent chromium is a toxic substance, and its toxicity is not only 100 times...

Claims

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Application Information

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IPC IPC(8): C14C11/00C14C9/00
Inventor 陈武勇龚英陈小云刘晓玲肖烈忠次仁玉珍
Owner 西藏自治区拉萨皮革厂
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