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Novel auxiliary agent for leather pickling procedure

A technology of pickling and process, applied in the field of new additives for the pickling process of leather, can solve the problems of non-conformity, increase of tanning sewage salt and chromium pollution, etc., and achieve the effects of reducing use, improving leather rate, and being difficult to wash off.

Active Publication Date: 2012-12-19
QI HE LI HOU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This increases the salt and chromium pollution in tannery sewage, which is not in line with the current purpose of environmentally friendly tannery clean production. According to statistics, the neutral salt produced in the pickling process can account for 30% of the neutral salt in tannery sewage. %~40%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A new auxiliary agent for leather pickling process, its composition is: 60% glutaric acid, 10% Pingpinga O-15, 10% sodium dodecylbenzenesulfonate, 20% sodium metapolyphosphate, Grind and mix thoroughly. According to the following process, the pickling process is carried out on the pickled leather, and the test is compared with that without the pickling assistant.

[0016] The amount of added materials is based on the quality of the pigskin-soaked inner leather

[0017] Weighing after tanning: 1.8mm±0.2mm (double layer)

[0018] Wash with distilled water 300% at room temperature and wash once in stuffy water for 5′

[0019] Softened distilled water 100% 35°C

[0020] Na 2 CO 3 0.5+0.6% 10' pH7.5-8.0

[0021] Softener SO 2.0%

[0022] NH 4 Cl 0.5%

[0023] Degreaser FB 0.5%, turn 60' stop 30'

[0024] Turn 90', stop 30'

[0025] Spin again 60' and wash with water

[0026] Select ...

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Abstract

The invention provides a novel auxiliary agent for a leather pickling procedure and a use method of the novel auxiliary agent. The auxiliary agent contains an organic acid compound, a fatty alcohol polyoxyethylene ether surface active agent, an alkylbenzene sulfonate surface active agent and calcium-magnesium ion chelate. The auxiliary agent is used for the leather pickling procedure in the tanning industry, can effectively improve the absorption of chromium and reduce the use of chromium powder and has the effect of improving the yield and the tensile strength of the leather. The invention can prevent the damage on the leather surface by the high mechanical effect in the low pH value and improve the solidity, the fine performance and the flexibility of the grain surface of the leather, and particularly has the obvious effect on a leather sample without completely de-ashing in the previous procedure.

Description

technical field [0001] The invention relates to the field of a new auxiliary agent for tanning production, more specifically, the invention relates to a new auxiliary agent used in leather pickling process, and the usage of the new auxiliary agent. Background technique [0002] The pickling process of leather is a relatively important process. After the leather is limed and delimed, the fibers in the raw hide are stretched, which provides a prerequisite for tanning. However, the deliming may not be clean in the previous process, and the fibers cannot be obtained. For the problem of full stretching, if the process of pickling is not carried out, there may be problems such as a lower leather yield of the tanned leather, high calcium and magnesium ions and hardening of the leather, and the quality of the finished leather will be greatly reduced. [0003] The pH of pickling in tanning is all below 3.2. At this time, the pH is lower than the isoelectric point of bare hide, and ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C1/08
Inventor 白清泉冯练享曲树光
Owner QI HE LI HOU CHEM CO LTD
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