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Production method of leather in which hexavalent chromium content reaches the standard

A production method, hexavalent chromium technology, applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, tanning treatment, etc., can solve leather properties such as softness, Plumpness and other problems such as reduced feel

Inactive Publication Date: 2006-07-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method reduces the content of hexavalent chromium in the leather to a certain extent, but it has not fundamentally solved the problem. Another problem caused by this is that the performance of the leather, such as softness and plumpness, is greatly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1, water washing: place the basket wet leather in the drum, add water of 300% of the weight of the wet blue leather, at room temperature, rotate at a speed of 3 rpm for 13 minutes, and drain; degreasing: wash the basket Put the wet leather in the drum, add 180% water of the weight of the wet blue leather and 0.5% non-ionic degreasing agent, and rotate at 40°C for 20 minutes at a speed of 3 rpm; then add the wet blue leather Concentration of 0.3% by weight is 10% formic acid solution, rotates at a speed of 3 rpm for 13 minutes, and drains; retanning: put the degreased basket wet leather in the drum, add Water and 4% modified glutaraldehyde, at 45°C, rotated for 60 minutes at a speed of 3 revolutions / minute; then added 4% chromium powder of wet blue leather weight, and rotated for 40 minutes at a speed of 3 revolutions / minute; Add 0.4% of the weight of wet blue leather soda, rotate at a speed of 3 rpm for 20 minutes, and drain; then add water with a weight of 2...

Embodiment 2

[0008] Embodiment 2, water washing: place the basket wet leather in the drum, add water of 200% of the weight of the wet blue leather, under normal temperature, rotate at a speed of 3 rpm for 11 minutes, drain; degreasing: wash the basket Put the wet leather in the drum, add 150% water of the weight of the wet blue leather and 0.3% non-ionic degreasing agent, and rotate at 38°C for 45 minutes at a speed of 3 rpm; then add the wet blue leather Concentration of 0.2% by weight is 10% formic acid solution, rotates for 11 minutes with the rotating speed of 3 rev / min, drains; retanning: place the basket wet leather after degreasing in the drum, add Water and 2% modified glutaraldehyde, at 42°C, rotated for 40 minutes at a speed of 3 revolutions / minute; then added 4% chromium powder of wet blue leather weight, and rotated for 45 minutes at a speed of 3 revolutions / minute; Add 0.4% of the weight of wet blue leather soda, rotate at a speed of 3 rpm for 26 minutes, and drain; then add w...

Embodiment 3

[0009]Embodiment 3, water washing: place the basket wet leather in the drum, add water of 280% of the weight of the wet blue leather, at room temperature, rotate at a speed of 3 rpm for 15 minutes, and drain; degreasing: wash the basket Put the wet leather in the drum, add 200% water of the weight of the wet blue leather and 0.8% non-ionic degreaser flatly, at 35°C, rotate at a speed of 3 rpm for 55 minutes; then add the wet blue leather Concentration of 0.5% by weight is 10% formic acid solution, rotate at a speed of 3 rpm for 15 minutes, and drain; retanning: put the degreased basket wet leather in the drum, add Water and 1% modified glutaraldehyde, at 44, rotate for 45 minutes at a speed of 3 revolutions / minute; add 4% chrome powder by weight of wet blue leather, and rotate for 55 minutes at a speed of 3 revolutions / minute; 0.4% of the weight of the wet-blue leather, rotated for 23 minutes at a speed of 3 revolutions / minute, and drained; then added water with 300% of the we...

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PUM

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Abstract

The invention discloses a leather mark-reaching producing method of hexavalent chromium, which comprises the following steps: placing the basket wet leather in barrate to wash; adding in water, degreasant, aminic acid liquor; discharging liquor; putting in water, modified glutaral, chromium powder, sodium thiosulphate; discharging liquor; adding in water, sodium acid sulfite, sodium thiosulphate, neutralization multiple tanning agent PAK-N apocenosis; discharging liquor; adding in water, synthetic tanning agent, acrylic resin tanning agent ART-1, bayberry extract, dye, sulfating modified adeps lanae fatting agent, synthetic fatting agent SES201, SCF synthetic fatting agent, DF recombination fatting agent, gallic acid, eldopaque and formaldehyde solution; discharging liquor; filling water; discharging liquor in the end. The invention prevents every nucleus of hexavalent chromium produced.

Description

technical field [0001] The invention relates to a leather production method in the field of light industry, in particular to a leather production method with hexavalent chromium content reaching the standard. Background technique [0002] The basic process route of tanning is as follows: firstly, the raw leather is prepared before tanning, then chrome tanned, washed with basket wet hide, degreased, then (chrome) retanned, alkali-lifted and neutralized, then dyed and fatliquored. Finally, color fixing and finishing are carried out to make finished leather. [0003] At present, the tanning agent used in tanning leather (including retanning) is mainly chrome tanning agent, and its main component is chromium (III) sulfate. The hexavalent chromium in leather comes from the oxidation of free or uncombined trivalent chromium in chrome tanned leather. According to chemical principles, under alkaline or neutral conditions, trivalent chromium is easily oxidized to hexavalent chromium...

Claims

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Application Information

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IPC IPC(8): C14C3/28
Inventor 俞从正孙根行马兴元
Owner SHAANXI UNIV OF SCI & TECH
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