Method for synthesizing retanning agent modified by starch in use for leather

A synthesis method and retanning agent technology, which is applied in the field of synthesis and preparation of modified starch retanning agent for leather, can solve problems such as leather pollution, and achieve the effects of significant thickening, simple preparation process, and plump and soft hand feeling

Inactive Publication Date: 2005-01-12
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

[0006] Example 1: Add distilled water with a starch mass of 350% and a 5% hydrogen peroxide solution with a concentration of 0.1mol / L to the starch, heat it to 80°C, and keep it warm for 1 hour. After the degradation reaction is complete, add sodium hydroxide solution to adjust the system The pH value of the solution is 7; when the degraded starch solution is heated to 73°C, the monomers of acrylic acid, acrylonitrile, acrylamide and butyl acrylate containing dodecylmercaptan in a molar ratio of 6:5:2:1 are added dropwise The mixture solution, the concentration of dodecyl mercaptan in the mixture is 0.3mol / L, the concentration of the monomer mixture is 2.8mol / L, and the ammonium persulfate initiator of 0.5mol / L is added dropwise at the same time, and the dropping time is controlled to be 1 Hours, carry out graft copolymerization reaction 2 hours after adding and complete and get final product.

Embodiment 2

[0007] Example 2: Add distilled water with 450% starch mass and 1% potassium permanganate solution with a concentration of 0.08mol / L to the starch, heat it to 85°C, and keep it warm for 3 hours. After the degradation reaction is completed, add sodium hydroxide The pH value of the solution adjustment system is 5; when the degraded starch solution is heated to 70°C, acrylic acid, methacrylic acid, acrylonitrile and methacrylic acid containing dodecylmercaptan in a molar ratio of 6:3:5:2 are added dropwise. The monomer mixture solution of methyl acrylate vinyl, the concentration of dodecyl mercaptan in the mixture is 0.1mol / L, the concentration of monomer mixture is 2.8mol / L, and the ammonium persulfate of 0.2mol / L is added dropwise at the same time to initiate agent, control the dropping time to 0.5 hours, and carry out the graft copolymerization reaction for 2.3 hours after the feeding is completed.

Embodiment 3

[0008] Example 3: Add distilled water with 380% starch quality and 4% sodium hypochlorite solution with a concentration of 0.05mol / L to the starch, heat it to 83°C, and keep it warm for 2.5 hours. After the degradation reaction is completed, add sodium hydroxide solution to adjust the system The pH value of the solution is 6; when the degraded starch solution is heated to 72°C, the monomers of acrylic acid, acrylonitrile, acrylamide and butyl acrylate containing dodecylmercaptan in a molar ratio of 6:5:2:1 are added dropwise The mixture solution, the concentration of dodecyl mercaptan in the mixture is 0.5mol / L, the concentration of the monomer mixture is 2.8mol / L, and the ammonium persulfate initiator of 0.6mol / L is added dropwise at the same time, and the dropping time is controlled to be 0.9 Hours, carry out graft copolymerization reaction 3 hours after adding and complete and get final product.

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Abstract

A composition method for a modified starch retuning agent used in leather is to oxidize and degrade the starch and then to be reacted with vinyl monomers in graft copolymerization reaction to finish the production, the retanned leather is plentiful and soft, if it is used before chrome tannage, then the absorption rate is increased obviously in chrome tannage so as to reduce the used level of Cr and it content in chrome tannage waste solution.

Description

technical field [0001] The invention relates to a preparation method of a leather retanning agent, in particular to a synthesis preparation method of 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 2002, the export of leather products reached $19 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-environmental materials that can be used in leather processing is a research hotspot at home and abroad. Eco-environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/12
Inventor 吕生华马建中吕庆强陈小强杨权荣
Owner SHAANXI UNIV OF SCI & TECH
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