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Preparation method of nanocellulose/borax/polyvinyl alcohol self-healing hydrogel

A technology of nanocellulose and polyvinyl alcohol, which is applied in the field of hydrogel preparation, can solve the problems of poor flexibility, uncontrollable shape, and self-healing of cellulose hydrogel, and achieve improved material safety, low cost, The effect of restoring integrity

Active Publication Date: 2020-01-07
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems of poor flexibility, uncontrollable shape and self-healing of existing cellulose hydrogels, and provides a preparation method of nanocellulose / borax / polyvinyl alcohol self-healing hydrogels

Method used

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  • Preparation method of nanocellulose/borax/polyvinyl alcohol self-healing hydrogel
  • Preparation method of nanocellulose/borax/polyvinyl alcohol self-healing hydrogel
  • Preparation method of nanocellulose/borax/polyvinyl alcohol self-healing hydrogel

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specific Embodiment approach 1

[0041] Specific embodiment one: present embodiment a kind of preparation method of nanocellulose / borax / polyvinyl alcohol self-healing hydrogel, it is carried out according to the following steps:

[0042] 1. Delignification:

[0043] ①. Cut and grind the cellulose raw material to obtain powder;

[0044]②. Immerse the powder in NaOH and NaOH 2 SO 3 mixed solution, and heated in a water bath at a temperature of 90°C to 100°C for 0.1h to 10h, and then poured out the waste liquid to obtain NaOH and NaOH 2 SO 3 processed powder;

[0045] The NaOH and Na 2 SO 3 The mixed solution consists of a NaOH solution with a concentration of 1mol / L to 10mol / L and a NaOH solution with a concentration of 0.1mol / L to 10mol / L. 2 SO 3 The solution is mixed according to the volume ratio of 1: (0.1 ~ 10);

[0046] ③, NaOH and Na 2 SO 3 The treated powder is boiled with deionized water for 0.5h~5h, and then the waste liquid is poured out;

[0047] ④. Replace the deionized water, and then r...

specific Embodiment approach 2

[0060] Embodiment 2: This embodiment differs from Embodiment 1 in that the cellulose raw material described in step ① is bamboo, balsa wood or straw. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0061] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is: in step 1.2, the powder is impregnated in NaOH and NaOH 2 SO 3 mixed solution, and heated in a water bath at a temperature of 90°C to 100°C for 5h to 10h, and then poured out the waste liquid to obtain NaOH and NaOH 2 SO 3 processed powder. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a hydrogel, and concretely relates to a preparation method of a nanocellulose / borax / polyvinyl alcohol self-healing hydrogel. The problems of poor flexibility, uncontrollable shape and self-healing failure of existing cellulose hydrogels are solved. The preparation method comprises the following steps: 1, removing lignin; 2, preparing a cellulose dispersion; and 3, preparing the hydrogel. The preparation method is used for preparing the nanocellulose / borax / polyvinyl alcohol self-healing hydrogel.

Description

technical field [0001] The invention relates to a preparation method of hydrogel. Background technique [0002] Cellulose can be isolated from abundant biomass resources in nature (including plants, microorganisms, and animals). For plant cellulose, except for a small part in the form of high purity (such as cotton fiber and bamboo fiber), cellulose is usually combined with hemicellulose, pectin and lignin as the main structural components of plant cell walls. Lignocellulose is a cellulose resource produced by trees through photosynthesis, and the content of cellulose in wood is about 40% to 50%. Lignocellulose is widely stored in wood fibers in wood cell walls, and lignocellulose, as a raw material for traditional forestry engineering and wood processing industries, has problems such as overcapacity and low added value. At the same time, with the depletion of petroleum resources and the increasingly serious environmental pollution, green biomass resources such as lignocel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L1/02C08K3/38C08J3/075C08J3/24
CPCC08J3/075C08J3/246C08J2329/04C08J2401/02C08K2003/387
Inventor 万才超张陆雨吴义强魏松刘心怡田文燕
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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