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A kind of superabsorbent hemicellulose airgel and preparation method thereof

A technology of hemicellulose and airgel, applied in the field of biomass materials, can solve the problems of complex reaction process, low degree of polymerization, high energy consumption, etc., and achieve the effects of simplifying the process flow, promoting cross-linking reaction, and simple operation

Active Publication Date: 2020-11-27
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the heterogeneous structure and low degree of polymerization of hemicellulose, it is not possible to directly prepare gel materials with complete shape and excellent water absorption capacity.
[0005] There have been many reports on the preparation of superabsorbent aerogels from hemicellulose, mainly using cross-linking agents to graft and copolymerize suitable vinyl or acrylic monomers to the surface of hemicellulose, but the reaction process is complex and High energy consumption, uneconomical, and the monomers used for graft polymerization are not easy to biodegrade

Method used

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  • A kind of superabsorbent hemicellulose airgel and preparation method thereof
  • A kind of superabsorbent hemicellulose airgel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] A kind of superabsorbent hemicellulose airgel of the present embodiment, concrete preparation steps are as follows:

[0031] (1) Dry beech hemicellulose in an oven at 105°C for 12h; at room temperature, dissolve 0.4g of dry hemicellulose in 5mL of 4% sodium hydroxide solution to obtain a hemicellulose solution; press polyethylene glycol and In the hemicellulose, the molar ratio of anhydrous xylose unit is 1:1 and the polyethylene glycol with a molecular weight of 400g / mol is added in 15mL of 4% sodium hydroxide solution to obtain a polyethylene glycol solution; the hemicellulose The plain solution and polyethylene glycol solution are blended to obtain hemicellulose / polyethylene glycol mixed solution;

[0032] (2) Add the cross-linking agent into the hemicellulose / polyethylene glycol mixed solution according to the molar ratio of the cross-linking agent epichlorohydrin to the hemicellulose anhydrous xylose unit of 3:1, microwave-assisted cross-linking at 40°C After 12 h...

Embodiment 2

[0037] A kind of superabsorbent hemicellulose airgel material of the present embodiment, concrete preparation steps are as follows:

[0038] (1) Dry corn cob hemicellulose in an oven at 105°C for 12 hours; at room temperature, dissolve 0.4g of dry hemicellulose in 5mL of 1% sodium hydroxide solution to obtain a hemicellulose solution; The molar ratio of the anhydrous xylose unit in the hemicellulose is 0.5:1 and the polyethylene glycol with a molecular weight of 6000g / mol is dissolved in 15mL of 1% sodium hydroxide solution to obtain a polyethylene glycol solution; The cellulose solution is blended with the polyethylene glycol solution to obtain a hemicellulose / polyethylene glycol mixed solution;

[0039] (2) Add the cross-linking agent into the hemicellulose / polyethylene glycol mixed solution according to the molar ratio of the cross-linking agent genipin to the hemicellulose anhydrous xylose unit of 1:1, and microwave-assisted oven at 80°C Medium cross-linking for 0.5h; soa...

Embodiment 3

[0042] A kind of superabsorbent hemicellulose airgel material of the present embodiment, concrete preparation steps are as follows:

[0043] (1) Dry bagasse hemicellulose in an oven at 105°C for 12h; at room temperature, dissolve 0.4g of dry hemicellulose in 5mL of 10% sodium hydroxide solution to obtain a hemicellulose solution; Anhydrous xylose unit molar ratio in hemicellulose is that the ratio of 4:1 weighs the polyethylene glycol of molecular weight 1000g / mol and is dissolved in 15mL 10% sodium hydroxide solution, obtains polyethylene glycol solution; The solution is blended with a polyethylene glycol solution to obtain a hemicellulose / polyethylene glycol mixed solution;

[0044] (2) Add the cross-linking agent into the hemicellulose / polyethylene glycol mixed solution according to the ratio of cross-linking agent glutaraldehyde to hemicellulose anhydrous xylose unit molar ratio of 8:1, microwave-assisted cross-linking at 60 °C 6h; soak the gel in 200mL ultrapure water af...

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Abstract

The invention belongs to the technical field of biomass materials and discloses an ultra-water-absorbing hemicelluloses aerogel and a preparation method thereof. The preparation method comprises the following steps: dissolving hemicelluloses and polyethylene glycol with a sodium hydroxide solution respectively; mixing the mixtures to obtain a hemicelluloses / polyethylene glycol mixed solution; andthen slowly adding a crosslinking agent into the hemicelluloses / polyethylene glycol mixed solution for microwave assisted crosslinking for 0.5-12 hours at 40-80 DEG C, washing the solution with ultra-pure water and drying the same to obtain the ultra-water-absorbing hemicelluloses aerogel. The method is simple to operate and high in efficiency. A product is intact in surface shape and free of shrinkage, shows a highly crosslinked compact porous structure inside, has a repeatable ultra-water-absorbing ability and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of biomass materials, and in particular relates to a superabsorbent hemicellulose airgel and a preparation method thereof. Background technique [0002] Super-absorbent materials refer to the ability to absorb and retain a large amount of water under the condition of free swelling, and can be used for sewage treatment, heavy metal adsorption or preparation of water-absorbing daily necessities. The most widely used water-absorbing material at present is petroleum-based water-absorbing resin, which is mainly prepared by cross-linking monomers such as acrylic acid or acrylamide. However, with the excessive consumption of non-renewable resources such as petroleum and the increasingly serious environmental pollution problems, the development and design of "all-natural" superabsorbent materials has become the focus and focus of current research. [0003] Airgel is a polymer with a three-dimensional network struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L71/02C08L5/14C08J9/28C08J3/075C08J3/28C08J3/24
CPCC08J3/075C08J3/246C08J3/28C08J9/28C08J2201/0504C08J2305/14C08J2371/02C08J2405/14C08J2471/02
Inventor 张雪琴肖乃玉钟乐翟万京
Owner ZHONGKAI UNIV OF AGRI & ENG