A method for combination tanning with less chromium after immersion of compound enzyme preparation

A compound enzyme preparation, combined with tanning technology, is applied in chemical treatment before tanning, small raw hide/large hide/leather/fur treatment, tanning treatment, etc. Scavenging, reducing the effect of chromium salt consumption

Inactive Publication Date: 2019-04-09
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The inorganic tanning agents used in the commonly used inorganic tanning methods include aluminum, titanium, zirconium, iron, zinc salts, etc., and it is often difficult to obtain satisfactory tanning effects with these single metal tanning agents. Combined, it can improve the tanning effect

Method used

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  • A method for combination tanning with less chromium after immersion of compound enzyme preparation
  • A method for combination tanning with less chromium after immersion of compound enzyme preparation
  • A method for combination tanning with less chromium after immersion of compound enzyme preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The used technological process of the present invention is as shown in table 1, and the specific operation steps of each operation of the tanning workshop section of tanning process and materials used are as follows:

[0036] (1) Soaking in water: in the drum, water: 200%; temperature: 25°C; add water from the drum door, compound protease (alkaline protease: neutral lipase = 5:1), cowhide, rotate for 60 minutes, stop for 20 minutes, Turn for 20 minutes, stop for 50 minutes, first turn for 40 minutes in the first 2 hours, stop for 20 minutes (second time), turn for 20 minutes in the next 2 hours, stop for 40 minutes (second time), and then carry out subsequent conventional hair removal and liming processes.

[0037] (2) Pre-tanning: carry out in the drum, the liquid ratio is 1, add 4-8wt% of zinc sulfate, 1% of sodium citrate, and the tanning temperature is 30°C. Turn for 6 hours, stop for 5 minutes every 1 hour, and stop the drum overnight.

[0038] (3) Pickling: carry...

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PUM

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Abstract

The invention relates to a chrome-reduced combination tanning method of a compound enzyme preparation after soaking. A compound enzyme is used as a soaking auxiliary agent, zinc salt is used for pretanning, then chromic salt is added for tanning, and then basification is performed, so that tanning is completed. The compound enzyme preparation contains alkaline protease and neutral lipase. According to the chrome-reduced combination tanning method, in the process that the compound enzyme is used as the soaking auxiliary agent, the enzyme dosage of the compound enzyme preparation is adjusted, so that compared with a simple soaking method, the time can be effectively shortened for 8 to 10 hours, in the chrome-reduced combination tanning process, the zinc salt is used for pretanning first, so that the consumption of the chromic salt can be effectively reduced, and blue wet skin after zinc and chrome combined tanning can satisfy normal production requirements.

Description

technical field [0001] The present invention relates to the production field of tanning industry, in particular to pre-tanning the composite enzyme preparation prepared by alkaline protease and neutral lipase in water, and applying zinc salt in the tanning process, so as to achieve less chrome tanned leather, The method includes process conditions. Background technique [0002] Chrome tanning is currently the main method of tanning leather, but the negative impact of chrome tanning on the environment has attracted more and more attention. Therefore, a series of new chrome-free and low-chrome tanning methods have been developed and utilized. The inorganic tanning agents used in the commonly used inorganic tanning methods include aluminum, titanium, zirconium, iron, zinc salts, etc., and it is often difficult to obtain satisfactory tanning effects with these single metal tanning agents. Combined, it can improve the tanning effect. Contents of the invention [0003] The pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/28C14C3/06C14C3/04C14C1/08C14C1/06C14C1/04
CPCC14C1/04C14C1/065C14C1/08C14C3/04C14C3/06C14C3/28
Inventor 路福平李玉曹珊程宝箴辛青龙
Owner TIANJIN UNIV OF SCI & TECH
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