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Chrome-free tanning processing process for sheepskins, sheep white wet pelts and sheepskins

A processing technology, chrome-free tanning technology, applied in leather/skin/leather/hide chemical treatment equipment, small raw hide/large raw hide/leather skin/fur chemical treatment, small raw hide/large raw hide/leather/fur treatment, etc. It can solve the problems of insufficient chromium resources, unfavorable environmental protection, and large pollution of chrome tanning, and achieve the effects of excellent air permeability, high safety, and good storage resistance

Active Publication Date: 2019-12-31
辛集市凌爵皮革有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the reserves of chromium in the world are limited after all, and my country’s chromium resources are not abundant, and it is an unavoidable reality that a large amount of use will be exhausted; Chromium-containing wastewater and chrome leather shavings, which is not conducive to environmental protection

Method used

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  • Chrome-free tanning processing process for sheepskins, sheep white wet pelts and sheepskins
  • Chrome-free tanning processing process for sheepskins, sheep white wet pelts and sheepskins

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A processing technology for chrome-free tanning of sheep leather, which comprises the following processing steps:

[0039] 1. Salt throwing of raw skins: Put the raw skins into the tumbler to rotate, and turn out the salt in the raw skins;

[0040] 2. Soak in water

[0041] 2.1. Pre-soaking water: Select the six raw skins with a total weight of 21kg and put them into the drum; add 200% water at 20°C to the drum, add 0.4% anionic surfactant, 0.1% fungicide and 0.4% soda ash, turn for 5 hours, drum out, and remove the flesh from the fur;

[0042] 2.2. Main immersion: Put the skins after fleshing into an empty drum, add 200% of water at 20°C, add 0.5% of anionic surfactant, 0.2% of fungicide and 0.6% of inorganic alkali, turn for 22 hours, and take out the drum. For horses, control water for 3 hours;

[0043] 3. Alkali depilation: add sodium sulfide and water to prepare lye with two concentrations of 180g / L and 30g / L, add calcium hydroxide respectively, and adjust the c...

Embodiment 2

[0054] A processing technology for chrome-free tanning of sheep leather, which comprises the following processing steps:

[0055] 1. Salt throwing of raw skins: Put the raw skins into the tumbler to rotate, and turn out the salt in the raw skins;

[0056] 2. Soak in water

[0057] 2.1. Pre-soaking water: select the six raw skins with a total weight of 21kg and put them into the drum; add 200% water at 23°C to the drum, add 0.4% anionic surfactant, 0.1% fungicide and 0.4% soda ash, turn for 6 hours, take out the drum, and remove the flesh from the fur;

[0058] 2.2. Main immersion: Put the skins after fleshing into an empty drum, add 200% water at 22°C, add 0.5% anionic surfactant, 0.2% fungicide and 0.6% inorganic alkali, turn for 26 hours, and take out the drum. For horses, control water for 4 hours;

[0059] 3. Alkali depilation: add sodium sulfide and water to prepare lye with two concentrations of 180g / L and 30g / L, add calcium hydroxide respectively, and adjust the conc...

Embodiment 3

[0070] A processing technology for chrome-free tanning of sheep leather, which comprises the following processing steps:

[0071] 1. Salt throwing of raw skins: Put the raw skins into the tumbler to rotate, and turn out the salt in the raw skins;

[0072] 2. Soak in water

[0073] 2.1. Pre-soaking water: Select the six raw skins after the above-mentioned salt drop, with a total weight of 21kg, and put them into the drum; add 200% of 25°C water to the drum, add 0.4% anionic surfactant, 0.1% fungicide and 0.4% soda ash, turn for 7 hours, drum out, and remove the flesh from the fur;

[0074] 2.2. Main immersion: Put the skins after fleshing into an empty drum, add 200% of water at 25°C, add 0.5% anionic surfactant, 0.2% bactericide and 0.6% inorganic alkali, turn for 30 hours, and take out the drum. For horses, control water for 5 hours;

[0075] 3. Alkali depilation: add sodium sulfide and water to prepare lye with two concentrations of 180g / L and 30g / L, add calcium hydroxide...

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Abstract

The invention relates to a chrome-free tanning processing process for sheepskins. The process comprises the following processing steps sequentially: water soaking, alkali sprinkled unhairing, liming,deliming softening, degreasing, pickling tanning, retanning dyeing, dressing and finishing, wherein a degreased skin material is subjected to chrome-free tanning by adopting a chrome-free tanning agent TWLZ in the step of pickling tanning so as to obtain white wet pelts, and the sheepskins are obtained through carrying out retanning dyeing on the white wet pelts and carrying out dressing and finishing processing. A chrome-free tanning process is successfully applied to raw sheep skin so as to prepare the white wet pelts and the sheepskins, and a tanning process does not generate chrome containing wastewater and chrome shavings, so that the processing process is environmentally friendly; the prepared white wet pelts have a maximum shrinkage temperature of 95 DEG C and are good in performance; the prepared white wet pelts are relatively good in whiteness and good in storability and do not discolor in one year, and the yellowing resistance is 4 level; and the finished sheepskins are goodin air permeability, and a shrinkage temperature reaches 90 DEG C or above.

Description

technical field [0001] The invention relates to the technical field of sheep leather processing, in particular to a chrome-free tanning process of sheep leather, sheep wet white leather and sheep leather. Background technique [0002] Leather is denatured and non-perishable animal skin obtained through physical and chemical processing such as depilation and tanning. It has a special grain layer on the surface, which has natural grain and luster, and feels comfortable. The leather processing technology mainly includes two processes: water field and dry field. The water field mainly includes immersion, hair removal, deliming, alcoholysis, pickling, chrome tanning, dyeing, fatliquoring and skinning. The semi-finished leather after skinning can directly produce suede leather and suede leather; the drying field mainly includes Rewetting, softening or softening, buffing, surface finishing and embossing, finally the finished leather is obtained. [0003] In leather processing, th...

Claims

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Application Information

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IPC IPC(8): C14C1/06C14C1/04C14C1/08C14C3/02C14C5/00C14C15/00
CPCC14C1/04C14C1/06C14C1/08C14C3/02C14C5/00C14C15/00
Inventor 温卫领
Owner 辛集市凌爵皮革有限责任公司
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