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High-strength copolymer modified silk fibroin water absorbing material and preparation method thereof

A technology of copolymer modification and silk fibroin, which is applied in the field of silk fibroin composite water-absorbing materials, can solve the problems of reducing the practicability of silk fibroin water-absorbing materials, poor water absorption of silk fibroin, and unsatisfactory water absorption of silk fibroin, etc., to achieve Enhance chemical stability, improve stretch elasticity, promote absorption and storage effects

Inactive Publication Date: 2020-02-07
李彩琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few products that apply silk fibroin to high-grade water-based materials, mainly because it is difficult to modify silk fibroin. The main method is physical modification through blending modification, but the improvement of the water absorption of silk fibroin is not good. , and the chemical modification methods mainly include coupling method and grafting method, etc., and usually there are acrylic acid or acrylamide substances to modify it, but the water absorption of modified silk fibroin is still not ideal, and the modified silk fibroin is still unsatisfactory. Silk fibroin suffers mechanically in terms of texture, tensile elasticity, and breaking strength, greatly reducing the utility of silk fibroin as a water-absorbing material

Method used

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Examples

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preparation example Construction

[0024] Poly(vinyl alcohol-N-vinyl formamide), the preparation method comprises the following steps: (1) Add 600-1500mL of anhydrous ethylene glycol to the reaction bottle, then weigh 40-44 parts of vinyl alcohol and 46-55 parts Stir N-vinylformamide evenly, then add 3-5 parts of azobisisobutyronitrile as a polymerization initiator and 2-5 parts of dodecyl mercaptan as a chain transfer agent, and transfer the solution into a high-temperature hydrothermal reactor place in an oven and heat to 120-130°C, react for 4-4 hours, cool the material to room temperature after the reaction, filter ethylene glycol to obtain white flocs, and wash the flocs with appropriate amount of distilled water and absolute ethanol in turn , and then placed in an oven and heated to 60-65 ° C to fully dry to obtain a small molecular weight copolymer poly(vinyl alcohol-N-vinyl formamide).

[0025] A high-strength copolymer modified silk fibroin water-absorbing material, the preparation method comprising th...

Embodiment 1

[0029](1) Preparation of poly(vinyl alcohol-N-vinyl formamide): Add 600 mL of anhydrous ethylene glycol into the reaction bottle, then weigh 40 parts of vinyl alcohol and 55 parts of N-vinyl formamide and stir evenly, then add 3 parts of azobisisobutyronitrile as a polymerization initiator and 2 parts of dodecyl mercaptan as a chain transfer agent, transfer the solution into a high-temperature hydrothermal reaction kettle, and heat it in an oven to 120°C for 4 hours. At the end of the reaction, cool the material to room temperature, filter ethylene glycol to obtain white flocs, wash the flocs with appropriate amount of distilled water and absolute ethanol in turn, then place them in an oven and heat them to 60°C to fully dry to obtain a small molecular weight copolymer poly( Vinyl alcohol-N-vinyl formamide) component 1.

[0030] (2) Preparation of poly(vinyl alcohol-N-vinyl formamide) grafted modified silk fibroin: add 300 mL of anhydrous ethylene glycol and 200 mL of absolute...

Embodiment 2

[0033] (1) Preparation of poly(vinyl alcohol-N-vinyl formamide): Add 1000 mL of anhydrous ethylene glycol into the reaction bottle, then weigh 41 parts of vinyl alcohol and 53 parts of N-vinyl formamide and stir evenly, then add 3.5 parts of azobisisobutyronitrile as a polymerization initiator and 2.5 parts of dodecyl mercaptan as a chain transfer agent, the solution was transferred into a high-temperature hydrothermal reaction kettle, and heated to 120°C in an oven, and reacted for 6 hours. At the end of the reaction, cool the material to room temperature, filter ethylene glycol to obtain white flocs, wash the flocs with appropriate amount of distilled water and absolute ethanol in turn, then place them in an oven and heat them to 60°C to fully dry to obtain a small molecular weight copolymer poly( vinyl alcohol-N-vinyl formamide) component 2.

[0034] (2) Preparation of poly(vinyl alcohol-N-vinyl formamide) grafted modified silk fibroin: add 500 mL of anhydrous ethylene glyc...

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Abstract

The invention relates to the technical field of silk fibroin composite water absorbing materials, and discloses a high-strength copolymer modified silk fibroin water absorbing material and a preparation method thereof. The high-strength copolymer modified silk fibroin water absorbing material comprises the following formulas and raw materials: degumming silk, poly(vinyl alcohol-N-vinyl formamide),chitosan, an initiator and a cross-linking agent. The poly(vinyl alcohol-N-vinyl formamide) grafted modified silk fibroin has a large number of hydrophilic group hydroxyl groups, amide groups and imino groups, the amide groups increase the repulsive force among grafted macromolecular chains, a huge three-dimensional network space is formed among the poly(vinyl alcohol-N-vinyl formamide), the absorption and storage of water molecules by the material are promoted, and ester groups are formed between chitosan and carboxyl groups in the silk fibroin, so that the electronic cloud density of the silk fibroin is reduced, the chemical stability of the silk fibroin is enhanced, the chitosan is bonded on the surfaces of silk fibroin molecules, the tensile elasticity and the breaking strength of thematerial are improved, and the mechanical properties of the material are enhanced.

Description

technical field [0001] The invention relates to the technical field of silk fibroin composite water-absorbing material, in particular to a high-strength copolymer modified silk fibroin water-absorbing material and a preparation method thereof. Background technique [0002] Super absorbent materials can be divided into natural and modified polymer super absorbent resins and artificial synthetic absorbent resins, mainly starch-based, cellulose-based, polyvinyl salt-based, polyvinyl alcohol-based, polyoxyethylene-based And other materials, which have excellent water absorption properties, can absorb water dozens or even hundreds of times their own quality, and water-absorbing materials are widely used in sanitary products, absorbent paper, pet mats, moisture-proof agents, water-retaining agents and soil conditioners, etc. . [0003] Silk is a continuous long fiber formed by solidification of the silk liquid secreted by cooked silkworms when they cocoon. It is a natural fiber. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08F289/00C08F271/00C08F220/54
CPCC08F271/00C08F289/00C08G81/02C08F220/54
Inventor 李彩琴
Owner 李彩琴
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