Fur free formaldehyde content reducing method

A technology of free formaldehyde content and free formaldehyde, applied in the field of leather, can solve problems such as the release pattern that cannot be completely targeted, and achieve the effect of strong wetting

Inactive Publication Date: 2015-06-24
ZHEJIANG ZHONGHUI FUR & LEATHER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] To sum up, whether it is the method of adding aldehyde remover or the process of enhancing mechanical action, there are certain limitations, that is, it cannot fully address the form of formaldehyde in fur products and the release of free formaldehyde, and at the same time take into account The generation and removal of free formaldehyde in two aspects

Method used

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  • Fur free formaldehyde content reducing method
  • Fur free formaldehyde content reducing method
  • Fur free formaldehyde content reducing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Retanning, dyeing and dealdehyde process of rabbit fur

[0070] 1) Rabbit fur is about 50kg, and the free formaldehyde content is determined to be 458.93mg / kg.

[0071] 2) Retanning, dealdehyde

[0072] Equipment: 1000L trough, ratio of water to fur liquid: 20 (mass ratio), temperature 35°C, industrial salt: (main component sodium chloride) 40g / L, formic acid: 0.5g / L, ammonium alum 5g / L, powder Chromium tanning agent (HLS-C of Brother Technology Co., Ltd., with a basicity of 33% and a content of 25% of chromium trioxide): 15g / L.

[0073] Operation: After adjusting the water temperature and water volume, add industrial salt and formic acid, paddle evenly, remove the skin, paddle for 30 minutes, add ammonium alum and chrome tanning agent, paddle for 60 minutes. After 5 minutes every hour, after 4 hours, add soda ash: 2-3g / L (dissolve soda ash with water 10 times the amount of soda ash, add it in three times, add once every 30 minutes), after 30 minutes, use a pH meter t...

Embodiment 2

[0102] Retanning, dyeing and dealdehyde process of raccoon fur

[0103] 1) About 50kg of raccoon fur, free formaldehyde content 661mg / KG.

[0104] 2) Retanning, dealdehyde

[0105] Equipment: 1000L trough, ratio of water to fur liquid: 20 (mass ratio), temperature 35°C, industrial salt: (main component sodium chloride) 40g / L, formic acid: 0.5g / L, ammonium alum 7g / L, powder Chromium tanning agent (HLS-C of Brother Technology Co., Ltd., with a basicity of 33% and a content of 25% of chromium trioxide): 13g / L.

[0106] Operation: After adjusting the water temperature and water volume, add industrial salt and formic acid, paddle evenly, remove the skin, paddle for 30 minutes, add ammonium alum and chrome tanning agent, paddle for 60 minutes. After 5 minutes every hour, after 4 hours, add soda ash: 3g / L (dissolve soda ash with water 10 times the amount of soda ash, add it in three times, add once every 30 minutes), after 30 minutes, use a pH meter to measure pH = 3.8 -4.0, when ...

Embodiment 3

[0121] Natural color raccoon fur retanning and dealdehyde process

[0122] 1) About 50kg of raccoon fur, the free formaldehyde content determined by the enterprise is 442.11mg / kg

[0123] 2) Retanning, dealdehyde

[0124] Equipment: 1000L trough, ratio of water to fur liquid: 20 (mass ratio), temperature 35°C, industrial salt: (main component sodium chloride) 40g / L, formic acid: 0.5g / L, ammonium alum 7g / L, powder Chromium tanning agent (HLS-C of Brother Technology Co., Ltd., 33% basicity, 25% chromium trioxide content): 13g / L.

[0125] Operation: After adjusting the water temperature and water volume, add industrial salt and formic acid, paddle evenly, remove the skin, paddle for 30 minutes, add ammonium alum and chrome tanning agent, paddle for 60 minutes. After 5 minutes every hour, after 4 hours, add soda ash: 3g / L (dissolve soda ash with water 10 times the amount of soda ash, add it in three times, add once every 30 minutes), after 30 minutes, use a pH meter to measure p...

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Abstract

The invention discloses a fur free formaldehyde content reducing method which comprises the following steps: 1) taking fur for weighing, and determining fur free formaldehyde content; 2) retanning for formaldehyde removal; 3) capturing to remove free formaldehyde; 4) washing to remove the free formaldehyde; 5) dye fixing; and 6) aldehyde fixing. The method can reduce the fur free formaldehyde content from about 450 mg / kg to 70 mg / kg or less, or even 20mg / kg or less, and the fur free formaldehyde content may not significantly rebound within three months.

Description

technical field [0001] The invention belongs to the technical field of leather, in particular to a method for reducing the content of free formaldehyde in fur. Background technique [0002] Formaldehyde is an indispensable and important chemical raw material in leather processing, especially fur processing. Due to the outstanding cost performance of formaldehyde, a large amount of formaldehyde has to be used in many cases. Taking leather processing as an example, tanning is the core of leather processing, and it is a process in which the chemical properties of the finished product change through chemical reactions between chemical reagents and hide proteins. [0003] At present, the materials (tanning agents) that can produce tanning effect on leather protein and can be used industrially mainly include chrome tanning agents (chrome complexes), vegetable tannins and aldehyde tanning agents. [0004] Chrome tanning agents have the best comprehensive effect on leather tanning,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/28C14C11/00
CPCC14C3/04C14C11/00D06P3/30
Inventor 马建标程凤侠俞中坚王亚平
Owner ZHEJIANG ZHONGHUI FUR & LEATHER
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