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A kind of modified chitosan amphoteric polymer retanning agent and preparation method thereof

An amphoteric polymer, chitosan technology, applied in animal husbandry, chemical treatment of small raw hides/large raw hides/leather hides/furs, applications, etc. Toxicity and other problems, to overcome the difficult regulation of structure and poor bond and ability, unique preparation method, easy pore size and shape.

Active Publication Date: 2011-11-30
南通安广美术图案设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Immobilized enzyme technology currently has problems such as expensive carrier, low immobilization efficiency, toxicity of the carrier, high cost, and poor stability, which limit the development and application of immobilized enzyme technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Preparation of immobilized horseradish peroxidase: Put 1 gram of activated silica gel in a round bottom bottle, add 10 grams of acetone and 1 gram of γ-(2,3-epoxypropoxy)propyltrimethoxy Silane, in N 2 Under protection, reflux for 8 hours, filter with suction to obtain epoxy silica gel, then add 15 grams of horseradish peroxidase solution with a concentration of 0.25 g / L and 10 grams of mixed phosphate buffer solution with a pH of 6.9, at 30 ° C reacted at low temperature for 10 hours, filtered, washed with the above-mentioned mixed phosphate buffer solution, and suction filtered to obtain immobilized HRP;

[0017] 2) Preparation of degraded chitosan: Mix 5 grams of chitosan and 90 grams of water and heat to 95°C, add 5 grams of hydrochloric acid with a mass fraction of 25%, and keep warm for 3 hours to obtain a degraded chitosan solution;

[0018] 3) Graft copolymerization reaction: add 4.5 grams of hydroxypropyl acrylate and 3.6 grams of methacrylic acid to 30 gra...

Embodiment 2

[0020] 1) Preparation of immobilized horseradish peroxidase: put 1.4 grams of commercially available activated silica gel in a round bottom bottle, add 11 grams of acetone and 1.2 grams of γ-(2,3-glycidoxy) propyl Trimethoxysilane, in N 2 Under protection, reflux for 8 hours, filter with suction to obtain epoxy silica gel, then add 17 grams of horseradish peroxidase solution with a concentration of 0.25 g / L and 11 grams of mixed phosphate buffer solution with a pH of 6.9, at 30 ° C React for 10 hours, filter, wash with the above-mentioned mixed phosphate buffer solution, and filter with suction to obtain immobilized horseradish peroxidase;

[0021] 2) Preparation of degraded chitosan: Mix 5 grams of chitosan and 90 grams of water and heat to 95°C, add 5 grams of hydrochloric acid with a mass fraction of 25%, and keep warm for 3 hours to obtain a degraded chitosan solution;

[0022] 3) Graft copolymerization reaction: add 6.1 grams of hydroxypropyl acrylate and 4.8 grams of me...

Embodiment 3

[0024] 1) Preparation of immobilized horseradish peroxidase: Preparation of immobilized horseradish peroxidase: Put 1.8 grams of commercially available activated silica gel in a round bottom bottle, add 12 grams of acetone and 1.4 grams of γ-(2 ,3-glycidoxy)propyltrimethoxysilane, in N 2 Under protection, reflux for 8 hours, filter with suction to obtain epoxy silica gel, then add 19 grams of horseradish peroxidase solution with a concentration of 0.25 g / L and 12 grams of mixed phosphate buffer solution with a pH of 6.9, at 30 ° C React for 10 hours, filter, wash with the above-mentioned mixed phosphate buffer solution, and filter with suction to obtain immobilized horseradish peroxidase;

[0025] 2) Preparation of degraded chitosan: Mix 5 grams of chitosan and 90 grams of water and heat to 95°C, add 5 grams of hydrochloric acid with a mass fraction of 25%, and keep warm for 3 hours to obtain a degraded chitosan solution;

[0026] 3) Graft copolymerization reaction: add 7.6 g...

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Abstract

The invention relates to a modified chitosan amphoteric polymer retanning agent and a preparation method thereof. In the technical scheme, the preparation method comprises the following steps of: immobilizing horseradish peroxidase (HRP) on activated silica gel by taking gamma-(2,3-epoxy propoxy)propyl trimethoxy silane as a coupling agent, and performing graft copolymerization reaction of hydroxypropyl acrylate, methacrylic acid and degraded chitosan under the initiation of an immobilized HRP / H2O2 / diacetone ternary system. The enzyme in the retanning agent can be recycled, so the cost is reduced, and the efficiency is improved; the modified chitosan amphoteric polymer retanning agent is non-toxic and non-irritant, has the high water solubility, and is suitable for the retanning of various kinds of leather, the viscosity is 18.5 mPa S (25 DEG C), the solid content is between 20 and 25 percent, and the pH value is between 6.5 and 7.0; the retanned products are high, plump and soft in fillibility; the thickening rate is 19 percent when the retanning agent is applied to sheep skin retanning leather, and the contraction temperature of the leather is 108 DEG C; and the application leather is high in a dyeing effect, the dyed leather is pure and bright in color, and the absorption rate of dyes is over 94 percent.

Description

technical field [0001] The invention belongs to the technical field of leather chemical industry, and relates to a modified chitosan amphoteric polymer retanning agent used in the leather tanning process and a preparation method thereof. Background technique [0002] Since the leather industry widely uses anionic vinyl polymers, which brings inconvenience to the subsequent dyeing process, it is of practical significance to prepare amphoteric polymer tanning agents, which can increase the absorption of dyes and improve leather fading. Chitosan has a large number of cationic groups-amino groups. Applying its grafted vinyl monomers to leather retanning agents can provide cationic dyes and covalent bond sites for anionic dyes. At the same time, chitosan also It has special physiological activity, antibacterial property, good biodegradability and biocompatibility. However, its molecular weight is large and its water solubility is poor. In the actual application process, it must ...

Claims

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Application Information

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IPC IPC(8): C14C3/22C08F251/00
Inventor 吕生华闫小亮
Owner 南通安广美术图案设计有限公司
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