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Method for tanning leather by external electric field

A technology of applied electric field and leather, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, chemical treatment before tanning, etc., can solve the problem of low shrinkage temperature and fracture of leather Problems such as poor elongation, limitation of chrome-free tanning method, etc., to achieve good tanning effect, low cost and improve tanning effect

Active Publication Date: 2020-05-08
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the chrome tanning method, the chrome-free tanning method has a poorer tanning effect on leather. The specific performance is that the shrinkage temperature of the leather is lower and the elongation at break is also poorer, which greatly limits the application of the chrome-free tanning method.

Method used

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  • Method for tanning leather by external electric field
  • Method for tanning leather by external electric field
  • Method for tanning leather by external electric field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of the (E)-4-(3,4,5-trichlorophenyl)but-3-enenitrile is:

[0030] At room temperature, 150 mmol (3,4,5-trichlorophenyl)boronic acid, 100 mmol 3-butenenitrile, 10 mmol catalyst palladium acetate, 5 mmol 2,2'-bipyridine, 250 mmol oxidant silver acetate and 600 mmol trifluoroacetic acid were added to Stir and mix in a reaction vessel with 20ml of solvent tetrahydrofuran, mix evenly, and react at a temperature of 90°C for 25 hours to obtain (E)-4-(3,4,5-trichlorophenyl ) but-3-enenitrile; Productive rate is 83.7%;

[0031] characterizing data

[0032] 1 H NMR (400MHz, CDCl 3 )δ7.06(s,2H),6.52-6.49(m,1H),6.25-6.21(m,1H),3.02(s,2H); 13 C NMR (100MHz, CDCl 3 )δ141.8, 135.7, 132.1, 129.8, 125.3, 121.4.117.1, 20.3;

[0033] Its reaction formula is

[0034]

Embodiment 2

[0036] A method for tanning leather with an external electric field, comprising the following steps: the amount of additives in each process is based on the quality of acid leather

[0037] Step 1: Add 100% deionized water and 8% sodium chloride into the drum, rotate for 20-30min, then add acid skin, continue to rotate for 20min, then adjust the pH of the system to 7.0-7.5, then rotate for 50min, control dry;

[0038] Step 2: Add 4% organic chlorine tanning agent, 0.4% cotanning agent and 100% deionized water into the drum, rotate at 32°C for 3 hours, and then perform the first tanning at 40°C , the tanning time is 4h, after the tanning is finished, control the drying;

[0039] Step 3: Add 100% deionized water into the drum, then adjust the pH of the system to 2.5-3.0 with a 10% sulfuric acid aqueous solution, and then rotate for 60 minutes; then add 2% zirconium tanning to the drum 15% sodium bicarbonate solution to adjust the pH of the system to between 5.5-6.0, and rotate...

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PUM

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Abstract

The invention discloses a method for tanning leather by an external electric field. The method comprises the following steps: firstly, carrying out deacidification treatment on pickled leather; then adding an organochlorine tanning agent and a tanning aid, and tanning for the first time, wherein the organochlorine tanning agent is a mixture of (E)-4-(3,4,5-trichlorophenyl)butyl-3-enitrile and (E)-4,4'-(ethylene-1,2-diyl)bis(2,6-dichlorobenzoic acid), the (E)-4-(3,4,5-trichlorophenyl)butyl-3-enitrile is formed by reacting (3,4,5-trichlorophenyl)boric acid with 3-butyronitrile, and the tanningagent selects a mixture of N,N'-diallyl L-tartardiamide, diethylene glycol dimethacrylate and 2-hydroxyhexanedial; and then adding a zirconium tanning agent to carry out further tanning on the leather. In the whole tanning process, no chromium-containing substance is used, and chromium pollution cannot be generated, so the whole tanning process is green and environmentally friendly; the method hasa good tanning effect on the leather, so that the shrinkage temperature of the leather reaches 101 DEG C; and method makes the leather have high tearing strength and elongation at break.

Description

technical field [0001] The invention relates to the field of leather preparation, in particular to a method for tanning leather with an external electric field. Background technique [0002] Leather has been one of the materials used by humans for warmth and decoration since ancient times, and because different animal skins have different toughness and softness. In order to make the leather more flexible and thus more suitable for decoration and wearing, those skilled in the art tan the leather with various tanning agents. The so-called tanning is the physical and chemical process of turning raw hide into leather through tanning agents, and it is the process in which hide collagen and tanning agents combine to denature raw hides into non-perishable leather. [0003] At present, commonly used tanning methods include chrome tanning, vegetable tanning, aluminum tanning, aldehyde tanning, etc. Among them, chrome tanning has the widest application range and is suitable for the p...

Claims

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Application Information

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IPC IPC(8): C14C3/30C14C3/26C14C3/04C14C1/00
CPCC14C3/30C14C3/26C14C3/04C14C1/00
Inventor 柴玉叶许晓红柴玉枝
Owner WENZHOU UNIVERSITY
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