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Synthetic method for preparing retanning agent of modified starch for leather

A technology of retanning agent and starch, which is applied in the field of synthesis and preparation of modified starch retanning agent for leather, can solve the problems of leather pollution, etc., and achieve the effect of significant thickening, plump and soft hand feeling, and fine grain surface

Inactive Publication Date: 2007-06-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem that plagues the development of the leather industry is the serious pollution it produces. The main reason is that a large amount of harmful leather chemicals are used in the leather processing process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: First, add 650 parts of distilled water and 90 parts of cornstarch in parts by mass to the reactor, heat and heat up under stirring to obtain a mixture, and add 2 parts by parts by mass of The mass fraction is 30% hydrogen peroxide, continue to heat up the temperature, carry out heat preservation reaction at 80 ℃, until the viscosity of the reactant in the system drops to 5mPa·s, the degradation reaction ends, and the mass fraction is 30% sodium hydroxide solution to adjust the system The pH value of the solution was 7 to obtain a degraded starch solution; when the temperature of the above degraded starch solution was kept at 70°C in the reactor, 200 parts of 10 parts of isopropanol and 90 parts of acrylic acid were added dropwise to the degraded starch solution in parts by mass. , 40 parts of acrylonitrile, 30 parts of acrylamide and 30 parts of butyl acrylate, simultaneously drop 40 parts of an aqueous ammonium persulfate solution obtained by dissolving 5 pa...

Embodiment 2

[0008] Example 2: First, add 850 parts of distilled water and 70 parts of cornstarch in parts by mass to the reactor, heat and heat up under stirring to obtain a mixture, and add 2 parts by parts by mass of For a sodium hypochlorite solution with an available chlorine content of 10%, continue to heat up and carry out a heat preservation reaction at 85°C until the viscosity of the reactant in the system drops to 3mPa·s. The pH value of the adjustment system is 6, and the degraded starch solution is obtained; when the temperature of the above-mentioned degraded starch solution is kept in the reactor at 75° C., 200 parts by mass parts are added dropwise in the degraded starch solution by 10 parts of isopropanol, 90 Parts of acrylic acid, 30 parts of methacrylic acid, 30 parts of acrylonitrile and 40 parts of methyl methacrylate, simultaneously drop 40 parts of ammonium persulfate aqueous solution obtained by dissolving 5 parts of ammonium persulfate in 35 parts of distilled water,...

Embodiment 3

[0009] Example 3: First, 720 parts of distilled water and 85 parts of cornstarch were added in parts by mass to the reactor, and the mixture was heated under stirring to obtain a mixture. When the temperature rose to 50°C, 2 parts of The mass fraction is 30% hydrogen peroxide, continue to heat up the temperature, carry out heat preservation reaction at 82 ℃, until the viscosity of the reactant in the system drops to 5mPa·s, the degradation reaction ends, and the mass fraction is 30% sodium hydroxide solution to adjust the system The pH value of the solution is 6 to obtain a degraded starch solution; when the temperature of the above-mentioned degraded starch solution is kept at 71° C. in the reactor, 200 parts of 10 parts of isopropanol and 90 parts of acrylic acid are added dropwise to the degraded starch solution in parts by mass. , 40 parts of acrylonitrile, a mixture of 30 parts of acrylamide and 30 parts of butyl acrylate, simultaneously drop 40 parts of ammonium persulfat...

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PUM

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Abstract

This is the method of preparing the modified starch-based retanning agent of leather. It oxidates and decomposes the starch, then react with vinyl monomer to polymerize. This retannage is used to leather cure of retanning, after retanning the leather feels soft and comfortable, exquisite surface, color uniformity, augment ply efficiently, no color withdraw. This chrome tanning can be used before retanning, and it can increase the absorption of the augmet, and decrease the quantity of chrome in the waste solution. The modified starch-based retanning agent of leather is a product valuable to environment protection, and has a significant mean of decreasing industrial pollution.

Description

technical field [0001] The invention relates to a method for synthesizing and preparing an eco-friendly leather retanning agent, in particular to a method for synthesizing and preparing a modified starch retanning agent for leather. Background technique [0002] my country is a veritable leather country and the center of the world's leather industry. The output and export volume of leather processing, leather shoes and leather goods in my country ranks first in the world. Leather export ranks first in foreign exchange earnings from light industry exports for many years. In 2003, the export of leather products reached $21 billion. But the main problem that plagues the development of the leather industry at present is the serious pollution it produces. The main reason is that a large amount of harmful leather chemicals are used in the leather processing process. Therefore, the synthesis of eco-friendly leather chemicals that can be used in leather processing is a research hots...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/12
Inventor 吕生华马建中吕庆强杨全荣
Owner SHAANXI UNIV OF SCI & TECH
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