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Tanning method for tanning sheepskin clothing leather by hyperbranched polymer-aluminum salt tanning agent

A technology of hyperbranched polymer, aluminum salt tanning agent, applied in leather degreasing, leather impregnation, small raw hide/large hide/leather/fur treatment, etc. Less than requirements, difficult to achieve moisture and heat stability, etc., to achieve the effect of reducing chromium salt pollution, excellent physical and mechanical properties, and reducing environmental pressure

Inactive Publication Date: 2013-04-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, chrome-free tanning agents cannot completely replace chrome tanning agents to make leather have better moisture and heat resistance stability.
From the perspective of the molecular structure of organic tanning agents and the way they combine with collagen molecules, vegetable tanning agents, aldehyde tanning agents, acrylic resin tanning agents, etc. are limited by their own structures, and the tanning of collagen molecules. The degree of chemical crosslinking is limited, and it is difficult to achieve ideal moisture and heat stability when used as a tanning agent instead of chrome tanning agent
At the same time, the physical and mechanical properties of some chrome-free tanning agents are poor, mainly in that the tensile strength cannot meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Step 1: Preprocessing:

[0078] Take 80 parts by weight of normal temperature water and 6 parts by weight of table salt in the drum, and turn it for 10 minutes. After the table salt is completely dissolved, put it into the acid peel, then dilute 0.1 parts by weight of formic acid with ten times of water, add it to the drum, and continue to turn it. 5min, drain.

[0079] Step 2: pickling:

[0080] Get 80 parts by weight of normal temperature water and 6 parts by weight of salt in the drum, turn for 10 minutes, then dilute 0.4 parts by weight of formic acid with ten times water, add in three times, each time at intervals of 10 minutes, adjust the pH value to 3.0, Continue to turn for 10 minutes.

[0081] Step Three: Tanning:

[0082] Get the hyperbranched polymer-aluminum salt tanning agent of 6 weight parts and the normal temperature water of 80 weight parts in the drum, turn 3h, add the sodium formate of 1 weight part, rotate 20min; Dilute with water, add in three t...

Embodiment 2

[0109] Step 1: Preprocessing:

[0110] Take 90 parts by weight of normal temperature water and 7 parts by weight of salt in the drum, and turn it for 15 minutes. After the salt is completely dissolved, put it into the acid skin, then dilute 0.2 parts by weight of formic acid with ten times of water, add it to the drum, and continue to turn it. 6min, drain.

[0111] Step 2: pickling:

[0112] Get 90 parts by weight of normal temperature water and 7 parts by weight of salt in a drum, turn for 15 minutes, then dilute 0.5 parts by weight of formic acid with ten times of water, add in three times, each time at intervals of 20 minutes, adjust the pH value to 3.1, Continue to turn for 20 minutes.

[0113] Step Three: Tanning:

[0114] Get the hyperbranched polymer-aluminum salt tanning agent of 7 weight parts and the normal temperature water of 90 weight parts in the drum, turn 4h, add the sodium formate of 1 weight part, rotate 30min; Dilute with water, add in three times, each ...

Embodiment 3

[0141] Step 1: Preprocessing:

[0142] Take 100 parts by weight of normal temperature water and 8 parts by weight of salt in the drum, and turn it for 20 minutes. After the salt is completely dissolved, put it into the acid peel, then dilute 0.3 parts by weight of formic acid with ten times of water, add it to the drum, and continue to turn it. 7min, drainage.

[0143] Step 2: pickling:

[0144] Get 100 parts by weight of normal temperature water and 8 parts by weight of salt in the drum, turn for 20min, then dilute 0.6 parts by weight of formic acid with ten times water, add in three times, each time at intervals of 30min, adjust the pH value to 3.2, Continue to turn for 30 minutes.

[0145] Step Three: Tanning:

[0146] Get the hyperbranched polymer-aluminum salt tanning agent of 8 weight parts and the normal temperature water of 100 weight parts in the drum, turn 5h, add the sodium formate of 1 weight part, rotate 40min; Dilute with water, add in three times, each time ...

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Abstract

The invention relates to a tanning method for tanning sheepskin clothing leather by a hyperbranched polymer-aluminum salt tanning agent. Current chrome free tanning agents cannot completely replace chrome tanning agents for realizing better anti-hydrothermal stability of leather. The tanning method provided by the invention comprises the following steps of: pre-treating; pickling; tanning; degreasing; retanning; neutralizing; filling; oiling and drying acidic leather. The preparation method of the hyperbranched polymer-aluminum salt tanning agent used in the tanning process comprises the following steps of: mixing diethanol amine and methyl acrylate, and adding methanol to obtain an AB2 type monomer; carrying out reaction of the AB2 type monomer with trimethylolpropane, and adding para-toluenesulfonic acid for temperature rising reaction to prepare hydroxyl-terminated hyperbranched polymer; carrying out reaction of the hydroxyl-terminated hyperbranched polymer with maleic anhydride, adding para-toluenesulfonic acid to prepare an intermediate of an aqueous liquor of the hydroxyl-terminated hyperbranched polymer, and mixing and reacting the intermediate aqueous liquor with analytically pure analytically pure at normal temperature to obtain the hyperbranched polymer-aluminum salt tanning agent. The method provided by the invention is higher in shrinkage temperature and can replace the conventional chrome tanning method, so that chrome tanning pollution is reduced.

Description

Technical field [0001] The present invention belongs to the field of leather tanning technology, which is specific to the tanning method of a cotton leather clothing leather leather leather leather leather leather leather leather leather leather leather leather leather leather leather leather leather leather leather leather leather leather leather. Background technique [0002] Since its inception in 1858, the chromium tanning method will still be the main tanning method because of its excellent performance and simple operation process, and occupy a dominant position in the production of light leather.However, while creating significant economic benefits, chromium tanning also produces inevitable chromium ion pollution. In addition, chromium resources have been limited, which has always troubled the sustainable development of the leather industry.To achieve the sustainable development of the leather industry, it is necessary to solve the problem of chromium ion pollution in tanni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/22C14C3/28C14C1/00C14C1/08C14C5/00C14C9/02C14C9/00C08G63/91
Inventor 王学川陈小珂强涛涛孙森
Owner SHAANXI UNIV OF SCI & TECH
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