Method for preparing multiple metallic ion leather tanning agents

A metal ion and tanning agent technology, which is applied in the field of leather tanning agent preparation, can solve the problems of difficult industrialization promotion, water washing resistance, poor aging resistance, and leather not washing resistance.

Inactive Publication Date: 2008-12-03
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the history of tanning industry, iron salt was also one of the earliest inorganic salts used for tanning. However, due to the obvious defects of iron tanned leather, such as poor washing resistance and aging resistance, it is difficult to promote industrialization of iron tanning alone. ; The pollution of aluminum salt is also small, but the leather tanned with aluminum alone is not washable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Add 100 parts of sodium chromium into the reaction kettle, add 150 parts of water and 95 parts of sulfuric acid to dissolve the sodium chromium to make a dichromic acid solution; add crushed solid waste containing chromium and collagen to the dichromic acid solution, the amount is equivalent to The organic matter is 45 parts, heated to 90° C. in a water bath, and stirred for 120 minutes. Then weigh 25 parts of sulfuric acid, dilute with 100 parts of water, and use it to dissolve 125 parts of ferrous sulfate, then drop it into the reaction system at 90°C, stir for 10 minutes, take a sample to detect that there is no Cr(VI), then add 10 parts Sodium tartrate and 13 parts of solid sodium citrate were stirred at 90° C. for 20 minutes, and then left to age to obtain a liquid leather tanning agent containing various metal ions.

Embodiment 2

[0013] Add 100 parts of sodium rufium into the reaction kettle, add 160 parts of water and 96 parts of sulfuric acid, stir to dissolve the sodium ruthin, and make a dichromic acid solution. Add the pulverized solid waste containing chromium and collagen into the dichromic acid solution, the amount of which is converted into 46 parts of organic matter, and keep warm at 92° C. and stir for 130 minutes. Then weigh 24 parts of sulfuric acid, dilute with 100 parts of water, and use it to dissolve 120 parts of ferrous sulfate, then drop it into the reaction system at 92°C, stir for 15 minutes, take a sample to detect that there is no Cr(VI), and then add 11 parts Sodium tartrate and 14 parts of solid sodium citrate were stirred at 92° C. for 30 minutes, and then left to age to obtain a liquid leather tanning agent containing various metal ions.

Embodiment 3

[0015] Add 100 parts of sodium red vanadium to the reaction kettle, add 170 parts of water and 97 parts of sulfuric acid, stir to dissolve the sodium red vanadium, and make a dichromic acid solution. Add crushed solid waste containing chromium and collagen into the dichromic acid solution, the amount of which is equivalent to 47 parts of organic matter, and keep warm at 94° C. and stir for 140 minutes. Then weigh 23 parts of sulfuric acid, dilute with 100 parts of water, and use it to dissolve 115 parts of ferrous sulfate, then drop it into the reaction system at 94°C, stir for 15 minutes, and after sampling to detect that there is no Cr(VI), add 12- 1 part of sodium tartrate and 15 parts of solid sodium citrate, stirred at 94°C for 40 minutes, and left to age to obtain a liquid leather tanning agent containing various metal ions.

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PUM

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Abstract

The invention discloses a method for preparing a plurality of metal ion leather tanning agents by utilizing chromium-containing and collagen solid wastes. Materials belonging to leather originally such as leather meal, leather bits and pieces, waste leather are used as raw materials for preparing chemical material which can be processed into leather; the chemical material is used in leather tanning and then is applied back to the leather; the chemical material has the best compatibility with the leather and can effectively form the self-closed recycle of materials. Namely, the chromium-containing and collagen solid wastes are used as a reducing agent instead of glucose, sulfur dioxide, etc., and ferrous sulfate is used as a supplementary reducing agent, so as to deoxidize sodium bichromate to prepare the leather tanning agents; chromium compounds in the solid wastes again become part of the metal ions which are used for preparing the tanning agents; collagen hydrolysate or oxidation products become filling materials in the tanning agents; the supplementary reducing agent becomes another metal ion in the tanning agents after being oxidized; the leather tanning agents containing a plurality of metal ions are prepared through the bridge link between sodium citrate and sodium tartrate.

Description

technical field [0001] The invention relates to a preparation method of a leather tanning agent, in particular to a method for preparing a leather tanning agent with various metal ions from solid waste containing chromium and collagen. Background technique [0002] China is a big country in leather production and consumption. Since most manufacturers still mainly use chrome tanning, a large amount of chrome-containing solid waste will be generated, such as chrome-containing leather shavings, leftovers from making leather products, and waste leather products. Wait. The matrix of the above-mentioned chromium-containing solid waste is animal skin collagen, and contains a large amount of chromium compounds, wherein more than 90% of collagen is contained, and about 7% of the chromium-containing compound is sodium alum. There are only about 300,000 tons of chromium-containing leather shavings produced in China every year. If these chromium-containing wastes are discarded, one wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/02C14C3/32
CPCY02W30/50
Inventor 程凤侠李思益
Owner JIAXING UNIV
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