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Leather non-pickling salt-free high-absorption chrome tanning process method

A process method and high-absorption technology, which can be used in small raw hide/big raw hide/leather/fur treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, chemical treatment before tanning, etc., can solve the problem of unfavorable environment and increase Difficulty in process control, damage to the strength of the skin, etc., to avoid environmental pollution problems, facilitate contact, absorption and utilization, and promote penetration and combination

Pending Publication Date: 2022-03-25
无极县景森皮革制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the traditional pickling-chrome tanning process, the absorption rate of the chrome tanning agent is generally only 60%-70%, and about 30%-40% of the chromium is not used, resulting in waste of chromium resources, such as direct discharge will bring greater harm Environmental pollution: At the same time, the neutral salt added to prevent skin swelling is also discharged together with the tanning waste liquid, which further brings harm to the environment
The pickling process increases the use of materials, increases the difficulty of process control, and has adverse effects on the environment
It is necessary to use a large amount of neutral salt during pickling, otherwise the hide will be "sour and swollen", which is not conducive to the penetration of chrome tanning agent in the early stage of tanning, and seriously damages the strength of the hide
If the amount of neutral salt is too large, the skin will be dehydrated, and the resulting leather will be thin and plump.
In the late stage of tanning, the combination of tanning agent and skin collagen is the main way. At this time, it is necessary to neutralize and remove the acid to dissociate the carboxyl group of the collagen and increase the molecular size of the chrome tanning agent. Chrome spots and other quality problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A process method for non-pickling and salt-free high-absorption chrome tanning of leather, the method comprising the following steps:

[0039] Step 1, weighing and measuring: weighing raw hides and skins is used as the basis for calculating materials in subsequent processes such as water immersion, liming, water washing, pre-deliming, deliming, softening, pickling, and tanning;

[0040]Step 2, soaking in water: add water submerged in the raw skin to the raw skin, add 0.4% of immersion aid, 0.2% of degreasing agent, 0.15% of bactericide, and 0.4% of sodium carbonate after adding water, rotate for 20 minutes at room temperature, Stop for 40 minutes, then rotate for 10 minutes every time, stop for 50 minutes, and cycle 12 times to remove the meat, dirt and preservatives on the raw material skin;

[0041] Step 3, liming, add 0.8 times water to the drum, add 0.5% liming aid, 0.1% degreasing agent, rotate for 30 minutes, add 0.5% lime, rotate for 30 minutes; add 0.5% depilato...

Embodiment 2

[0053] A process method for non-pickling and salt-free high-absorption chrome tanning of leather, the method comprising the following steps:

[0054] Step 1, weighing and measuring: weighing raw hides and skins is used as the basis for calculating materials in subsequent processes such as water immersion, liming, water washing, pre-deliming, deliming, softening, pickling, and tanning;

[0055] Step 2, soaking in water: add water submerged in the raw skin to the raw skin, add 0.4% of immersion aid, 0.2% of degreasing agent, 0.15% of bactericide, and 0.4% of sodium carbonate after adding water, and rotate for 30 minutes at room temperature. Stop for 40 minutes, then rotate for 10 minutes every time, stop for 50 minutes, and cycle 12 times to remove the meat, dirt and preservatives on the raw material skin;

[0056] Step 3, liming, add 0.8-1 times of water to the drum, add 0.5% liming aid, 0.1% degreasing agent, rotate for 40min, add 0.5% lime, rotate for 30-40min; add 0.5% Then...

Embodiment 3

[0068] A process method for non-pickling and salt-free high-absorption chrome tanning of leather, the method comprising the following steps:

[0069] Step 1, weighing and measuring: weighing raw hides and skins is used as the basis for calculating materials in subsequent processes such as water immersion, liming, water washing, pre-deliming, deliming, softening, pickling, and tanning;

[0070] Step 2, soaking in water: add water submerged in the raw skin to the raw skin, add 0.4% of soaking aid, 0.2% of degreasing agent, 0.15% of bactericide, and 0.4% of sodium carbonate after adding water, and rotate for 25 minutes at room temperature. Stop for 40 minutes, then rotate for 10 minutes every time, stop for 50 minutes, and cycle 12 times to remove the meat, dirt and preservatives on the raw material skin;

[0071] Step 3, liming, add 0.9 times of water to the drum, add 0.5% liming aid, 0.1% degreasing agent, rotate for 35 minutes, add 0.5% lime, rotate for 35 minutes; add 0.5% de...

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Abstract

The invention provides a non-pickling salt-free high-absorption chrome tanning process method for leather. The method comprises the following steps: step 1, weighing and metering; step 2, soaking in water; step 3, liming; step 4, washing with water; step 5, pre-deliming; step 6, deliming and softening: adding 0.5-1 time of 30 DEG C water, adding 0.8% of a deliming agent and 0.2% of a degreasing agent, adding sulfuric acid to adjust the pH value to 3.5, and adding 0.5% of softening compound enzyme and 0.5% of an auxiliary agent; step 7, washing with water; step 8, chrome tanning; step 9, adding acid: adding formic acid and rotating for 30 minutes, wherein the use amount of the formic acid is 0.4-0.5% of the tare weight of the raw materials; step 10, adding acid for several times; the method has the characteristics that the production cost is saved, the environmental pollution is reduced, and the quality index of a finished product is not reduced by promoting chrome tanning absorption.

Description

technical field [0001] The invention relates to the technical field of clean leather production, in particular to a high-absorption chrome tanning process for leather without pickling and salt. Background technique [0002] The key process of transforming the raw skin into leather is the blue skin section: soaking, dehairing, liming, fleshing, softening, washing, pickling, chrome tanning and other processes, among which the pickling process is mainly to reduce the pH value of the bare hide , make it close to the PH value of the chrome tanning solution, prevent the surface from over-tanning, further disperse the collagen fibers, increase the reactive group of the collagen, further remove the non-fibrous protein in the skin and partially dehydrate the collagen, and increase the gap between the collagen fibers, which is beneficial Penetration and binding of tanning agent molecules. In the traditional chrome tanning process, pickling is generally carried out first, that is, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/04C14C1/08C14C3/06
CPCC14C1/04C14C1/08C14C3/06
Inventor 杨军子范闪杨世超靳龙涛银德海
Owner 无极县景森皮革制品有限公司
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