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Fur tanning method capable of removing residual formaldehyde in fur product

A fur and tanning technology, applied in the field of tanning, can solve the problems of environmental pollution, operator injury, and the content of free formaldehyde cannot meet the national standards, and achieve the effect of reducing environmental pollution and reducing bodily harm.

Active Publication Date: 2009-12-30
天津市雄冠科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Formaldehyde is contained in many tanning agents commonly used at present, because formaldehyde is extremely easy to cause harm to the operator's body and produce environmental pollution, so it is internationally recognized as a harmful substance, and free formaldehyde will remain in fur products
Therefore, all countries have established standards for the content of free formaldehyde in fur products. The Chinese standard stipulates that the content of free formaldehyde in fur products sold domestically should be <300ppm, and the content of free formaldehyde in fur products exported to Japan and South Korea should be <75ppm. The content of free formaldehyde in fur products in Europe and America is required to be less than 20ppm, and the content of free formaldehyde in fur products made by the current fur tanning method cannot meet the national standards.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The fur tanning method capable of removing residual formaldehyde in fur products provided by the present embodiment includes the following steps carried out in order:

[0014] 1) First, process the raw hide item by item according to the current general classification, soaking, freshening, washing, reimmersing, freshening, fleshing, degreasing, softening, pickling, tanning and tanning;

[0015] 2) At a temperature of 35° C., add the above-mentioned tanned fur to a sulfuric acid solution with a concentration of 1.0 g / L for pickling for 2 hours, and then remove the skin and shake it;

[0016] 3) At a temperature of 55°C, add the above-mentioned pickled fur to a solution composed of 10ml / L hydrogen peroxide and 1.2ml / L ammonia water for oxygen washing for 6 hours, and then peel and shake water;

[0017] 4) At a temperature of 45°C, soak the above-mentioned fur that has been subjected to oxygen washing in a solution composed of 8g / L sodium sulfite, 8g / L sodium sulfite and 0...

Embodiment 2

[0020] The fur tanning method capable of removing residual formaldehyde in fur products provided by the present embodiment includes the following steps carried out in order:

[0021] 1) Firstly, the raw hides and hides are processed item by item according to the current general classification, soaking, freshening, washing, reimmersing, freshening, fleshing, degreasing, softening, pickling and tanning;

[0022] 2) At a temperature of 38°C, add the above-mentioned tanned fur to a sulfuric acid solution with a concentration of 1.1g / L for pickling for 2 hours, and then remove the skin and shake off water;

[0023] 3) At a temperature of 55°C, add the above-mentioned pickled fur to a solution composed of 10ml / L hydrogen peroxide and 1.2ml / L ammonia water for oxygen washing for 6 hours, and then peel and shake water;

[0024] 4) At a temperature of 45°C, soak the above-mentioned fur that has been treated with oxygen washing in a solution composed of 6g / L sodium sulfite, 6g / L sodium...

Embodiment 3

[0027] The fur tanning method capable of removing residual formaldehyde in fur products provided by the present embodiment includes the following steps carried out in order:

[0028] 1) Firstly, the raw hides and hides are processed item by item according to the current general classification, soaking, freshening, washing, reimmersing, freshening, fleshing, degreasing, softening, pickling and tanning;

[0029] 2) At a temperature of 40°C, add the above-mentioned tanned fur to a sulfuric acid solution with a concentration of 1.2g / L for pickling for 2 hours, and then remove the skin and shake off water;

[0030] 3) At a temperature of 55°C, add the above-mentioned pickled fur to a solution composed of 10ml / L hydrogen peroxide and 1.2ml / L ammonia water for oxygen washing for 6 hours, and then peel and shake water;

[0031] 4) At a temperature of 45°C, immerse the above-mentioned fur that has been treated with oxygen washing in a solution composed of 4g / L sodium sulfite, 5g / L sod...

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Abstract

The invention discloses a fur tanning method capable of removing residual formaldehyde in fur products. The fur tanning method is as follows: after the process in the current commonly used fur tanning method of the industry, the processes comprising pickling, oxidizing washing and removal of residual formaldehyde in peltry in the removing and tanning processes are added; the reaction among sodium hydrosulfite used as reducing agent and hydrogen peroxide with oxidization and formaldehyde and the pro-nuclear reaction between sodium sulfite and formaldehyde are utilized to change the molecular structure of formaldehyde, thereby denaturing and removing free formaldehyde. The content of free formaldehyde in prepared fur products is less than 20ppm, thereby not only meeting the national standards, but also reducing hazards to operators and environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of tanning, in particular to a fur tanning method capable of removing residual formaldehyde in fur products. Background technique [0002] In the tanning industry, the qualitative change process of turning raw hide into leather is called tanning. Among them, raw hides mainly include sheepskin, rabbit skin, mink skin, fox skin, cowhide, horse skin, etc. The tanned fur products can be used to make civilian products such as clothing, shoes and hats, car cushions, and indoor sheep shearing blankets. The chemicals used in the tanning process are called tanning agents. Many tanning agents commonly used at present all contain formaldehyde, because formaldehyde is extremely easy to cause harm to the operator's health and produce environmental pollution, so it is internationally recognized as a harmful substance, and free formaldehyde will also remain in fur products. Therefore, all countries have established stand...

Claims

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Application Information

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IPC IPC(8): C14C3/32
CPCY02W30/50
Inventor 何玉祥张瑾赵鑫
Owner 天津市雄冠科技发展有限公司
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