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Novel additive for leather pickling procedure

A pickling and process technology, which is applied in the field of new additives in the leather pickling process, can solve the problems of non-compliance, increased tanning sewage salt and chromium pollution, etc., and achieve the goals of reducing use, increasing leather rate, and improving tensile strength Effect

Inactive Publication Date: 2017-06-09
QINGDAO SENMEIKE CHEM TECH 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 type of auxiliary agent for leather pickling process, its composition is: glutaric acid 60%, Pingpinga O-15 10%, sodium dodecylbenzene sulfonate 10%, sodium metapolyphosphate 20%, grinding Crush 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′ and stop 30′

[0025] Spin another 60′ and wash

[0026] Select 50 skins, face up, cut the skins from the rear buttocks to the front, and ...

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Abstract

The invention provides a novel auxiliary agent used in leather pickling process and usage of the novel auxiliary agent. This additive contains organic acid compounds, fatty alcohol polyoxyethylene ether surfactants, alkylbenzene sulfonate surfactants and calcium and magnesium ion chelates. This additive is used in the pickling process of the leather industry, which can effectively improve the absorption of chromium, reduce the use of chromium powder, and at the same time improve the yield and tensile strength of leather. In the low pH value, it can avoid the damage of high mechanical action to the leather surface, and can also improve the firmness, fineness and softness of the leather grain. Especially it has obvious effect on skin samples that have not been deashed in the previous process.

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 Applications(China)
IPC IPC(8): C14C1/08C14C3/02
CPCC14C1/08C14C3/02
Inventor 李春梅
Owner QINGDAO SENMEIKE CHEM TECH CO LTD
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