Non-chromium leather tanning method

A chrome leather and tanning technology, applied in the field of leather preparation, can solve the problems of high toxicity, easy residue, environmental pollution and the like

Active Publication Date: 2013-07-24
何裕华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chromium-containing additives mainly contain hexavalent chromium ions. Due to the high toxicity of hexavalent chromium, it is easy to remain, and the residual chromium salts cause great harm to the ecological environment, humans and animals.
In the traditional chrome tanning method, the waste chrome shavings produced after chrome tanning cannot be effectively utilized, resulting in a large loss of waste collagen produced in the leather industry, and also brought serious environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0074] 1. Sweeping salt, cutting edges, counting sheets, weighing:

[0075] 2. Soaking in water:

[0076] One immersion:

[0077] Water 200% Bleach 0.1%

[0078] time 3 hours

[0079] Secondary immersion:

[0080] Soaking aid 0.3% Degreaser DF 0.3%

[0081] Water 200% time 3 hours;

[0082] 3. Remove the meat and weigh;

[0083] 4. Drain gangue:

[0084] Water 100% normal temperature

[0085] Sodium Hydrosulfide 1.5% Degreaser 0.3%

[0086] Gangue 0.2% time 60 minutes

[0087] Penetrant 0.3% Liming aid 0.3%

[0088] Lime 1% Liquid gangue 0.4%

[0089] Bulking agent 0.4% Liming enzyme 0.15%

[0090] Time 50 minutes

[0091] Expansion agent 0.4% liquid gangue 0.4%

[0092] Liming aid 0.3% time 60 minutes

[0093] ? 100% water, turn 10 minutes,? ancient too bare;

[0094] 5. Pieces of gangue;

[0095] 6. Weighing;

[0096] 7. Deashing:

[0097] Water 50% Ammonia deliming agent 0.5%

[0098] time 30 minutes

[0099] Sulfuric acid 0.3% 30 minu...

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Abstract

The invention provides a non-chromium leather tanning method. The non-chromium leather tanning method comprises the following steps of: (a) pre-treating animal skin, soaking in water and weighing, and soaking in gangue to obtain gangue skin; (b) carrying out deliming, softening and primary pickling onto the raw gangue skin to obtain raw skin; (c) carrying out secondary pickling onto the raw skin; (d) tanning the raw skin after the secondary pickling; (e) primarily fixing the tanned raw skin in formic acid for 30 minutes after carrying out oxidizing, aldehyde-removing and re-tanning; and carrying out neutralizing treatment after rinsing for 60 minutes by virtue of oxalic acid; and (f) getting out the raw skin after the neutralizing treatment from a rotary drum after carrying out fat liquoring, secondary fixing, and water-washing, drying the raw skin after primary stabbing, re-moistening for 20 hours, knocking and softening for 8 hours, and carrying out secondary stabbing and drying to obtain the tanned leather. The leather tanning method provided by the invention is free of chromium-containing preparation, so that the leather processing process is more environment-friendly, and the harms to the construction staffs are reduced.

Description

technical field [0001] The invention relates to the field of leather preparation, in particular to a chrome-free leather tanning method. Background technique [0002] Leather has been one of the materials used by humans for warmth and decoration since ancient times, and because different animal skins have different toughness and softness. In order to make the leather more flexible and thus more suitable for decoration and wearing, those skilled in the art usually tan the leather. The so-called tanning is the physical and chemical process of turning raw hide into leather through tanning agents, which is called tanning. It is the process in which the combination of dermatogens and tanning agents denatures raw hides into non-perishable leather. A process in which leather is processed, after which only the genuine leather of the leather remains for further processing. [0003] The tanning of leather is generally carried out in a drum, and the tanning method varies according t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/08C14C1/04C14C1/00C14C1/06C14C3/08C14C3/02C14C3/28C14C9/02C14C15/00
Inventor 何裕华
Owner 何裕华
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