Method for preparing nano composite high-absorptivity chrome tanning auxiliary agent by combining polycarboxylic acid copolymer with montmorillonite

A nano-composite and montmorillonite technology, which is applied in animal husbandry, small raw hide/large raw hide/leather skin/fur chemical treatment, application, etc., can solve the problem of low absorption rate of chrome tanning agent, soil pollution, and rising cost of tanning and other problems, to achieve the effect of good physical and mechanical properties, improved exhaustion rate, and obvious thickening

Inactive Publication Date: 2012-06-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional chrome tanning method has brought serious environmental problems. The absorption rate of chrome tanning agent is not high, only about 60%. The direct discharge of a large amount of chromium-containing waste liquid has caused serious pollution to soil and water; Cr 3+ Oxidized to Cr 6+ It will directly cause damage to human skin and induce various diseases
In addition, due to the shortage of chrome resources in my country, almost all chrome tanning agents are imported. In recent years, the price of chrome tanning agents has been rising year after year, resulting in a sharp increase in the cost of tanning.
As the main tanning method, the traditional chrome tanning method has faced enormous pressure and challenges

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The method for preparing nano-composite high-absorption chrome tanning auxiliary agent in combination with polycarboxylic acid copolymer with montmorillonite is realized by the following steps:

[0018] Step 1: Disperse 2g of nano-montmorillonite with 150g of distilled water, add 0.5g of cetyltrimethylammonium chloride, react at 60°C for 4h, ultrasonicate for 0.5h, cool, filter, and wash with water until chlorine-free Ionization, drying, and grinding to obtain modified montmorillonite;

[0019] Step 2: Disperse 2g of modified montmorillonite with 150g of water for 2 hours, add 15g of methacrylic acid, react for 0.5h, heat in a water bath, continue to add methacrylic acid and ammonium persulfate dropwise at 50°C for 30min, react at constant temperature for 1h, cool, The material is discharged to prepare polycarboxylic acid copolymer combined with montmorillonite nano-composite high-absorption chrome tanning auxiliary.

Embodiment 2

[0021] The method for preparing nano-composite high-absorption chrome tanning auxiliary agent in combination with polycarboxylic acid copolymer with montmorillonite is realized by the following steps:

[0022] Step 1: Disperse 6g of nano-montmorillonite with 250g of distilled water, add 1g of cetyltrimethylammonium chloride, react at 80°C for 5h, ultrasonicate for 1.2h, cool, filter, and wash with water until there is no chloride ion , dried, and ground to obtain modified montmorillonite;

[0023] Step 2: Disperse 6g of modified montmorillonite with 250g of water for 3.5h, add 23g of methacrylic acid, react for 1.2h, heat in a water bath, continue to drop methacrylic acid and ammonium persulfate at 65°C for 30min, react at constant temperature for 2h, and cool , and discharging, to prepare polycarboxylic acid copolymer combined with montmorillonite nano-composite high-absorbing chrome tanning auxiliaries.

Embodiment 3

[0025] The method for preparing nano-composite high-absorption chrome tanning auxiliary agent in combination with polycarboxylic acid copolymer with montmorillonite is realized by the following steps:

[0026] Step 1: Disperse 10g of nano-montmorillonite with 400g of distilled water, add 1.5g of hexadecyltrimethylammonium chloride, react at 95°C for 6h, ultrasonicate for 2h, cool, filter, and wash with water until there is no chloride ion , dried, and ground to obtain modified montmorillonite;

[0027] Step 2: Disperse 10g of modified montmorillonite with 300g of water for 5h, add 30g of methacrylic acid, react for 2h, heat in a water bath, continue to add methacrylic acid and ammonium persulfate dropwise at 80°C for 30min, react at constant temperature for 3h, cool, and release The material is used to prepare polycarboxylic acid copolymer combined with montmorillonite nano-composite high-absorption chrome tanning auxiliary.

[0028] Aiming at the problems of low absorption r...

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Abstract

The invention relates to a method for preparing a nano composite high-absorptivity chrome tanning auxiliary agent by combining polycarboxylic acid copolymer with montmorillonite. In the traditional chrome tanning method, the absorptivity is not high, and serious pollution is caused by direct discharge of a great deal of chromium-containing waste liquid. The method comprises the steps of: dispersing 2-10 g of nano montmorillonite with 150-400 g of distilled water, adding 0.5-1.5 g of cetyl trimethyl ammonium chloride, reacting at the temperature of 60-95 DEG C for 4-6 hours and ultrasonically treating for 0.5-2 hours to obtain modified montmorillonite; and dispersing 2-10 g of modified montmorillonite with 150-300 g of water for 2-5 hours, adding 15-30 g of methacrylic acid, reacting for 0.5-2 hours, heating in water bath, keeping dropwise adding methacrylic acid and an initiator at 50-80 DEG C for 30 minutes, carrying out an isothermal reaction for 1-3 hours, cooling and discharging to obtain a final product. The method has the advantages that: a pickling working procedure in the traditional chrome tanning process is omitted, the absorptivity to the chrome tanning waste liquid is improved, and the final product is a environment-friendly nano composite material.

Description

technical field [0001] The invention relates to a preparation method of a nano-composite high-absorption chrome tanning auxiliary, in particular to a method for preparing a nano-composite high-absorption chrome tanning auxiliary by combining a polycarboxylic acid copolymer with montmorillonite. Background technique [0002] In tanning production, due to the excellent properties of chrome tanned leather, most of the finished leather is produced by chrome tanning. However, the traditional chrome tanning method has brought serious environmental problems. The absorption rate of chrome tanning agent is not high, only about 60%. The direct discharge of a large amount of chromium-containing waste liquid has caused serious pollution to soil and water; Cr 3+ Oxidized to Cr 6+ It will directly cause damage to human skin and induce various diseases. In addition, my country is short of chromium resources, and chrome tanning agents are almost entirely imported. In recent years, the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F2/44C08K9/04C08K3/34C14C3/02C14C3/22
CPCC14C3/02C08F220/06C08K2201/011C14C3/06C08F2/44C08K3/346C08K3/34C14C3/22C08K9/04
Inventor 马建中李运高党鸽吕斌吕秀娟
Owner SHAANXI UNIV OF SCI & TECH
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