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Preparation method of lignocellulose three-component bi-crosslinking gel, the gel and application

A lignocellulose, three-component technology, applied in the field of preparation of lignocellulose three-component double cross-linked gel, can solve the problem of difficult preparation of high-solid gel with high-strength gel, difficulty in increasing gel solid content, chemical cross-linking problems such as difficulty in preparation, to achieve the effect of solving the difficulty of efficient utilization, improving the effective utilization rate, and reducing the cost of preparation

Active Publication Date: 2021-07-20
NANJING FORESTRY UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In summary, it is difficult to increase the solid content of the gel in a dispersion system, and it is difficult to fully mix the chemical crosslinking agent with the dispersion under high solid content, so it is difficult to prepare a high-solid high-strength gel with physical and chemical double cross-linking

Method used

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  • Preparation method of lignocellulose three-component bi-crosslinking gel, the gel and application
  • Preparation method of lignocellulose three-component bi-crosslinking gel, the gel and application
  • Preparation method of lignocellulose three-component bi-crosslinking gel, the gel and application

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preparation example Construction

[0040] According to one aspect of the present invention, as figure 1 Shown, the preparation method of lignocellulose three-component double-crosslinked gel is provided, and this preparation method comprises the following steps:

[0041] S1. Using cellulose raw materials to prepare a nanocellulose dispersion, and dissolving hemicellulose and lignin in corresponding solvents to obtain a hemicellulose solution and a lignin solution, respectively;

[0042] S2, uniformly mixing the nanocellulose dispersion, hemicellulose solution and lignin solution to obtain a lignocellulose dispersion containing nanocellulose, hemicellulose and lignin;

[0043] S3. Put the three-component lignocellulose dispersion in a double-steam bath closed environment with dual functions of physical crosslinking and chemical crosslinking to prepare lignocellulose three-component double-crosslinked gel.

Embodiment 1

[0047] Take a nanocellulose dispersion equivalent to 0.0750 g of absolute dry mass and add a certain amount of distilled water to fully mix to obtain a uniform and transparent dispersion of 5 g. Centrifuge to remove air bubbles and put it into a mold. Put a certain amount of ammonia water and ring Oxychloropropane provides a gas environment where physical and chemical cross-linking can occur, and the dispersion is placed in a double-steam bath environment, and reacted at 65° C. for 3 hours to obtain a cellulose double-cross-linked gel. The solid content in the obtained cellulose double-crosslinked gel was 1.5 wt%.

[0048] Transfer the reacted cellulose double-crosslinked gel to a clean beaker filled with ethanol to terminate the chemical reaction and perform solvent replacement, and replace the ethanol every few hours to ensure complete solvent replacement. Viscoelasticity measurements were performed on cellulose double-crosslinked gels to characterize their strength.

Embodiment 2

[0050] Take the nanocellulose dispersion equivalent to 0.0675g dry mass, dissolve 0.0075g glucomannan in distilled water, fully mix the above two raw materials and add a certain amount of distilled water to obtain 5g uniform and transparent dispersion, and remove it by centrifugation. Bubble and put into the mold, put a certain amount of ammonia water and epichlorohydrin into the airtight container to provide a gas environment where physical and chemical crosslinking can occur, place the dispersion in a double steam bath environment, and react at 65 °C After 3 hours, a lignocellulose two-component double-crosslinked gel was obtained. The obtained lignocellulose two-component double-crosslinked gel has a solid content of 1.5 wt%, and a cellulose:hemicellulose ratio of 9:1 (mass ratio).

[0051] The reacted lignocellulose two-component double-crosslinked gel was transferred to a clean beaker filled with ethanol to terminate the chemical reaction and perform solvent replacement, ...

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Abstract

The invention discloses a preparation method of lignocellulose three-component bi-crosslinking gel, the gel and application; the preparation method comprises the following steps: preparing a nanocellulose dispersion liquid by using a cellulose raw material, and respectively dissolving hemicellulose and lignin in corresponding solvents to respectively obtain a hemicellulose solution and a lignin solution; uniformly mixing the raw materials to obtain lignocellulose dispersion liquid containing three components, namely nanocellulose, hemicellulose and lignin; then feeding the three-component lignocellulose dispersion liquid to a double-steam-bath closed environment with double functions of physical crosslinking and chemical crosslinking for reaction so as to produce the lignocellulose three-component double-crosslinking gel. The method has the beneficial effects that the solid content of the gel can be effectively improved to prepare the high-strength gel, the operation is simple, industrialization is easy to realize; the obtained gel has good mechanical properties and biocompatibility and can be widely applied to the fields of catalytic adsorption, biological medicines, sensors and the like.

Description

technical field [0001] The invention relates to the technical field of gel preparation and production, in particular to a preparation method, gel and application of lignocellulose three-component double-crosslinked gel. Background technique [0002] The three major components of lignocellulose, a natural plant raw material, are cellulose, hemicellulose, and lignin. This kind of natural high molecular polymer, which is rich in sources, easy to obtain, easy to degrade, non-toxic and harmless, is used in human production and life. play a pivotal role. Gel is a substance with a three-dimensional network structure connected by a certain action, and is currently widely used in drug delivery, tissue engineering, wound dressing, water purification, catalysis, electrical components and other fields. In recent years, more and more researchers have used lignocellulose as a natural polymer to prepare gel materials with diverse functions. [0003] The cross-linking methods of lignocell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/04C08L5/14C08L97/00C08J3/24C08J3/075C08J9/28
CPCC08J3/246C08J3/075C08J9/28C08J9/0061C08J2301/04C08J2405/14C08J2497/00C08J2205/026C08J2201/0484
Inventor 王志国马丽莎张莉莉范一民
Owner NANJING FORESTRY UNIV
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