A method for preparing silk fibroin-based water-absorbent material based on coupling and enzymatic graft copolymerization

A technology of water-absorbing materials and silk fibroin, which is applied in the direction of absorbent pads, pharmaceutical formulas, and cosmetic preparations, etc., can solve the problems of easy pollution of the environment and difficult biodegradation, and achieve safe treatment process, good water absorption, and mild enzyme treatment conditions Effect

Active Publication Date: 2019-10-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solution polymerization method is a method of using water as a carrier to dissolve monomers and carry out polymerization reactions. Among them, acrylic acid (AA) and acrylamide (AM) monomers are common raw materials for synthesizing water-absorbing materials, but due to the existence of polymers, they are not easy to The shortcomings of biodegradation and easy pollution of the environment affect its application to varying degrees

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The silk fibroin-based water-absorbing material is prepared by the method mentioned in the present invention, and the specific process steps are as follows:

[0045] (1) Preparation of silk fibroin solution: add mulberry silk to an aqueous solution of lithium bromide or calcium chloride, dissolve it at 70°C, put the silk fibroin solution into a dialysis bag, dialyze in deionized water for 24 hours, and filter to obtain silk fibroin. prime solution;

[0046] (2) Preparation of vinyl diazonium salt: dissolve 10 g / L 3-vinyl aniline with 6 g / L hydrochloric acid, add 8 g / L sodium nitrite to prepare diazonium salt solution, and treat at 0°C for 30 min; After the reaction, use starch-potassium iodide test paper to detect nitrous acid in the diazonium salt solution, remove excess nitrous acid with urea, and adjust the pH of the diazonium salt solution to 9.0;

[0047] (3) Coupling reaction of silk fibroin: add the silk fibroin prepared in step (1) to the diazonium salt solutio...

Embodiment 2

[0055] The silk fibroin-based water-absorbing material is prepared by the method mentioned in the present invention, and the specific process steps are as follows:

[0056] (1) Preparation of silk fibroin solution: add mulberry silk to an aqueous solution of lithium bromide or calcium chloride, dissolve it at 75°C, put the silk fibroin solution into a dialysis bag, dialyze in deionized water for 36 hours, and filter to obtain silk fibroin. prime solution;

[0057] (2) Preparation of vinyl diazonium salt: Dissolve 12.5 g / L 4-vinyl aniline with 7.5 g / L hydrochloric acid, add 7.5 g / L sodium nitrite to prepare diazonium salt solution, and treat at 0°C. Time 30min; after the reaction, use starch-potassium iodide test paper to detect nitrous acid in the diazonium salt solution, remove excess nitrous acid with urea, and adjust the pH of the diazonium salt solution to 9.0;

[0058] (3) Coupling reaction of silk fibroin: Add the silk fibroin prepared in step (1) to the diazonium salt ...

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Abstract

The invention discloses a fibroin based water absorbing material preparation method based on coupling and enzymatic graft copolymerization and belongs to the technical field of textile chemistry. According to the method disclosed by the invention, diazo salt is prepared by diazotization of arylamine containing vinyl, then the diazo salt generates coupling reaction with fibroin, and finally enzymatic fibroin and hydrophilic vinyl monomer generate graft copolymerization to improve hydrophilia of a fibroin material. The preparation method comprises the following specific technologies and steps: (1) fibroin solution preparation; (2) preparation of diazo salt containing vinyl; (3) fibroin coupling reaction; (4) graft copolymerization between the enzymatic fibroin and hydrophilic vinyl monomer;(5) fibroin based water absorbing material formation. Compared with introducing vinyl monomer on fibroin through a chemical crosslinking method and then utilizing persulfate or chemical methods of anultraviolet radiation method and the like to trigger the graft copolymerization between the fibroin and the hydrophilic vinyl monomer, the preparation method disclosed by the invention has the advantages of high graft copolymerization efficiency and moderate enzyme treatment conditions; furthermore, the fibroin based water absorbing material has the advantage of good water absorption.

Description

technical field [0001] The invention relates to a method for preparing silk fibroin-based water-absorbing materials based on coupling and enzymatic graft copolymerization, and belongs to the technical field of textile chemistry. Background technique [0002] Silk fibroin is the main component of silk, composed of 18 kinds of amino acids, most of which are less polar tyrosine and alanine segments, and the rest include polar amino acids, such as glutamic acid, aspartic acid, and serine and tyrosine etc. Silk fibroin has good biocompatibility and environmental friendliness, and the regenerated protein material processed from silk fibroin is non-toxic and non-irritating. The water-absorbing material is a high molecular polymer with many hydrophilic groups, which not only has a very high water-absorbing function, but also has a good water-retaining function (no dehydration or little dehydration under pressure). Generally speaking, after the ideal water-absorbing material is dri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F220/06C08J5/18A61K8/02A61K8/64A61L15/32
CPCA61K8/0212A61K8/64A61L15/32C08F289/00C08J5/18C08J2351/00C08F220/06C08L51/00
Inventor 王平郭晓晓崔莉余圆圆王强
Owner JIANGNAN UNIV
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