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Secondary recycling method of pigskin chrome-free combination tannage waste liquid

A secondary cycle combined tanning technology, applied in the fields of application, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc., can solve the problem of polluting tanning agent usage efficiency , Reduced effective utilization of aldehydes, etc., to achieve considerable economic and social benefits, stable process, good product resistance to heat and humidity effects

Inactive Publication Date: 2012-01-11
温州复亿实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But there are two problems in the industrialized production, one is that there are more vegetable tanning agents in the bath liquid after the tanning and absorption balance of the vegetable tanning agent, which will not only cause pollution but also reduce the use efficiency of the tanning agent after being discarded; Vegetable tannins will react with the subsequent aldehydes to produce precipitation, which also leads to a decrease in the effective utilization of aldehydes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 Production of pigskin head layer light-colored shoe lining

[0029](1) The first batch of vegetable tanning: Take 100 parts by weight and put the acid skin with a pH of 3.5 into the circulation drum. The circulation drum is a one-way circulation drum. In the positive and negative rotation, one of the rotation directions can make the liquid Internal and external circulation flow, add 100 parts of pickling solution at a temperature of 25 °C, 8 parts of anhydrous sodium sulfate, 3 parts of sodium carbonate, non-circulating rotation for 20 minutes, add 20 parts of Vitex bark extract, non-circulating Turn for 20 minutes. Reverse, rotate in a circular manner, turn on the external heating device and rotate for 30 minutes, so that the temperature of the circulating fluid rises to 35°C. Reverse non-circular rotation for 3 hours. Then, the reversing cycle rotates, and all the liquid is exported out of the circulating drum, passed through filtration, and collected...

Embodiment 2

[0035] Embodiment 2 Production of pigskin top layer dark shoe upper leather

[0036] (1) The first batch of vegetable tanning: Take 100 parts by weight and put the acid skin with a pH of 3.0 into the circulation drum. The circulation drum is a one-way circulation drum. In the positive and negative rotation, one of the rotation directions can make the liquid Circulate internally and externally, add 100 parts of pickling solution at a temperature of 25°C, 6 parts of anhydrous sodium sulfate, 3 parts of sodium carbonate, and rotate for 20 minutes without circulation, add 20 parts of bayberry extract, and rotate for 20 minutes without circulation. minute. Reverse, rotate in a circular manner, turn on the external heating device and rotate for 20 minutes, so that the temperature of the circulating fluid rises to 35°C. Reverse non-circular rotation for 2 hours. Then, the reversing cycle rotates, and all the liquid is exported out of the circulating drum, passed through filtratio...

Embodiment 3

[0042] Example 3 Manufacture of pigskin top layer chrome-free shoe upper leather

[0043] (1) The first batch of vegetable tanning: take 90 parts of pickling skins with a pH of 3.3 and put them into the circulation drum, add 90 parts of pickling solution at a temperature of 23 °C, 7 parts of anhydrous sodium sulfate, 3 parts of sodium carbonate, non-circulating rotation for 17 minutes, adding 20 parts of vegetable tanning agent, wherein 10 parts of wattle bark extract, 10 parts of quince extract, non-circulation rotation for 17 minutes. Reverse, rotate in a circular manner, turn on the external heating device and rotate for 25 minutes, so that the temperature of the circulating fluid rises to 38°C. Reverse non-circular rotation for 2 hours. Then, the reversing cycle rotates, and all the liquid is exported out of the circulating drum, passed through filtration, and collected in the A pool, which is marked as "A" liquid.

[0044] (2) The first batch of aldehyde tanning: Put ...

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Abstract

The invention discloses a secondary recycling method of pigskin chrome-free combination tannage waste liquid, comprising the following steps: using a vegetable tanning agent to carrying out penetration and tanning, after finishing the balance, discharging the solution; adding glutaraldehyde in tanning, collecting the waste solution, when the second batch of tanning begins, adding the first waste solution and supplementing the vegetable tanning agent, discarding after the tanning; and then adding aldehyde-containing waste liquid recycled by the first time and supplementing aldehyde for tanning, after the tanning, discharging the tanning solution. So, a circulation is finished, and a pollution discharge is reduced. According to the invention, the combination of the vegetable tanning agent and the aldehyde tanning agent are used for carrying out respective tanning on rawhide, each tanning agent is used for tanning according to certain proportion and order, and the two tanning agent form a cooperative effect, the shrinkage temperature can reach more than 90 DEG C, the produced leather presents light yellow without dying, is soft and full hand feel and very good elasticity, and has good aging resistance, sweat resistance, and flame retardation performance. The invention provides a new approach for present industrial production of chrome-free-tanned leather of tannery.

Description

technical field [0001] The invention belongs to the field of leather tanning, and in particular relates to a method for secondary recycling of pigskin chrome-free combined tanning waste liquid. Background technique [0002] The wastewater discharge and pollution problems of tanning and fur industry have always been the bottleneck restricting the development of leather industry. The wastewater produced by the leather industry contains many types of pollutants, complex components, high concentration and high chroma. At present, the discharge of tannery wastewater worldwide, especially the discharge of wastewater after tanning, will cause waste of resources and pollution of the environment. For decades, tannery wastewater has been studied as an important topic to solve tannery pollution at home and abroad, and good results have been achieved. At present, the more recognized treatment method and the characteristics of recycling are to collect the wastewater from key pollution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/08C14C3/28C14C3/10C14C3/16
CPCY02B30/52
Inventor 单志华傅维石冯国涛梁钟尹陈慧
Owner 温州复亿实业有限公司
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