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Method for preparing modified starch tanning agent

A starch tanning agent and modification technology are applied in the field of leather synthetic tanning agent and its preparation, and in the field of preparation of degradable and environmentally friendly modified starch tanning agent, which can solve the problems of easy mildew, poor permeability, hindering the application of starch and the like.

Inactive Publication Date: 2012-05-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early 1990s, my country also did exploratory research on the use of dialdehyde starch in the production of wet white leather and its tanning performance. Application in leather processing

Method used

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  • Method for preparing modified starch tanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Add 15 grams of cornstarch and 0.5 grams of ammonium persulfate into 85 grams of deionized water, stir and heat to 90°C, add 3 milliliters of 6mol.L after 15 minutes -1 Hydrochloric acid solution, continue heat preservation reaction for 3 hours to obtain acid-decomposed oxidized starch; Sodium bicarbonate neutralizes the pH of the system to 7, adding 5 milliliters of HRP solution with a concentration of 0.5 g / L, and adding 15.6 grams of hydrogen peroxide solution with a mass fraction of 30%, and controlling the dropping time for 1 hour. Continue the heat preservation reaction for 3.5 hours to obtain the grafted modified starch; add 2.6 grams of periodic acid to the above grafted starch, neutralize the pH of the system to 3 with hydrochloric acid, heat to 35°C, and react for 3 hours to obtain the modified starch tanning agent .

Embodiment 2

[0013] Example 2: Add 16.5 grams of cornstarch and 0.6 grams of ammonium persulfate into 93.5 grams of deionized water, stir and heat to 91°C, add 3.2 milliliters of 6mol.L after 15 minutes -1 Hydrochloric acid solution, continue the heat preservation reaction for 3.1 hours to obtain the acid-decomposed oxidized starch; Sodium bicarbonate neutralizes the pH of the system to 7, adds 6 milliliters of HRP solution with a concentration of 0.5 g / L, and adds 17.2 grams of hydrogen peroxide solution with a mass fraction of 30%, and controls the dropping time for 1.1 hours. Continue the heat preservation reaction for 3.8 hours to obtain the grafted modified starch; add 2.8 grams of periodic acid to the above grafted starch, neutralize the pH of the system to 3 with hydrochloric acid, heat to 36°C, and react for 3.2 hours to obtain the modified starch tanning agent .

Embodiment 3

[0014] Example 3: Add 18 grams of cornstarch and 0.7 grams of ammonium persulfate into 102 grams of deionized water, stir and heat to 92°C, add 3.4 milliliters of 6mol.L-1 hydrochloric acid solution after 15 minutes, and continue the heat preservation reaction for 3.2 hours. Obtain acid-decomposed oxidized starch; add 10.8 grams of p-aminobenzenesulfonic acid, 7.0 grams of gallic acid and 18.7 grams of pull-off powder to the above-mentioned degraded starch solution, stir and heat to 32 ° C, and neutralize the pH of the system to 7 with sodium bicarbonate , adding 7 milliliters of HRP solution with a concentration of 0.5 g / liter, adding 18.7 grams of hydrogen peroxide solution with a mass fraction of 30%, controlling the dropping time for 1.2 hours, and continuing the insulation reaction for 4 hours after the dropping to obtain grafting Modified starch: add 3.1 g of periodic acid to the above grafted starch, neutralize the pH of the system to 3 with hydrochloric acid, heat to 37...

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Abstract

The invention discloses a method for preparing a modified starch tanning agent, comprising the following steps of: firstly, degrading corn starch; in the presence of HRP (Horse Radish Peroxidase) / hydrogen peroxide (H2O2), grafting and modifying the degraded starch with sulfanilic acid, gallic acid and nekal; and then oxidizing the grafted starch with periodic acid. The invention has the innovation points that a nekal structure unit is introduced in the starch structure so as to improve the permeation wetting function of the modified starch tanning agent; the gallic acid structure unit is introduced to improve the tanning properties of the modified starch tanning agent, the sulfanilic acid is introduced to increase the dispersivity of the modified starch tanning agent, and dialdehyde action is used for improving the tanning properties of the modified starch tanning agent. The preparation method of the invention is peculiar and practical, and the obtained tanning agent is an environmentally-friendly leather tanning agent and is suitable for primary tanning and retanning. The shrinkage temperature (Ts) of pickled leather after primary tanning can be improved to 75-80 DEG C; and the retanned product has the advantages of wash resistance, high absorption rate on dyes and fatting agents and the like, is soft and plump.

Description

technical field [0001] The invention belongs to the technical field of leather chemical industry, relates to a synthetic leather tanning agent used in the leather tanning process and a preparation method thereof, in particular to a preparation method of a degradable and environment-friendly modified starch tanning agent. Background technique [0002] China's leather output and export both rank first in the world, and China is already a major leather producer in the world. At present, the pollution problem is the top priority that plagues the sustainable development of my country's leather industry. Among them, chrome tanning agents are one of the most serious pollution sources in leather factories. Therefore, the production of non-polluting syntans has become a current research focus. Domestically, a lot of work has been carried out around chrome-free tanning agents, such as Shi Bi, Ma Jianzhong and Shan Zhihua et al. , Modified starch retanning agent, modified glutaraldehy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/00C08B31/18C14C3/22
Inventor 吕生华闫小亮段建平高瑞军弓瑞马艳芬
Owner SHAANXI UNIV OF SCI & TECH
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