A kind of multiple chemical cross-linking reinforced cellulose airgel and its preparation method

A technology of cellulose airgel and chemical crosslinking, which is applied in the field of multiple chemical crosslinking reinforced cellulose airgel and its preparation, and can solve the problems of complex cellulose modification process, poor biocompatibility, and long production cycle , to achieve a uniform and stable porous structure, increase the connection density, and enhance the mechanical properties

Active Publication Date: 2018-10-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the problems of high toxicity and poor biocompatibility of glutaraldehyde as a cross-linking agent, and the modification process of cellulose is complex, high energy consumption, and long production cycle

Method used

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  • A kind of multiple chemical cross-linking reinforced cellulose airgel and its preparation method
  • A kind of multiple chemical cross-linking reinforced cellulose airgel and its preparation method
  • A kind of multiple chemical cross-linking reinforced cellulose airgel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Weigh 10 g of wood pulp cellulose micron wire suspension with a mass fraction of 1.1 wt%, add silane coupling agent KH-560 into the cellulose micron wire suspension, and hydrolyze with magnetic stirring for 2 h at room temperature and neutral conditions, The methoxy groups on the silane coupling agent KH-560 are fully hydrolyzed into silicon hydroxyl groups to obtain a mixed suspension; wherein the mass ratio of cellulose micron wires to silane coupling agent KH-560 is 1:0.5.

[0031] (2) Prepare an aqueous solution of branched polyethyleneimine (molecular weight: 600) with a concentration of 15 wt % with deionized water. At room temperature, add the branched polyethyleneimine aqueous solution to the mixed suspension obtained in (1), and at room temperature, stir magnetically for 30 minutes to make the epoxy group of the silane coupling agent KH-560 and the branched polyethyleneimine The amino group of the cellulose fully reacts and cross-links; wherein, the mass ra...

Embodiment 2

[0034] (1) Weigh 10 g of wood pulp cellulose micron wire suspension with a mass fraction of 1.1 wt%, add silane coupling agent KH-560 into the cellulose micron wire suspension, adjust the pH value to 8 at room temperature, and magnetically stir Hydrolyze for 2 hours to fully hydrolyze the methoxy groups on the silane coupling agent KH-560 into silicon hydroxyl groups to obtain a mixed suspension; wherein the mass ratio of cellulose micron wires to silane coupling agent KH-560 is 1:1.

[0035] (2) Prepare an aqueous solution of branched polyethyleneimine (molecular weight: 1000) with a concentration of 15 wt % with deionized water. At room temperature, add the branched polyethyleneimine aqueous solution to the mixed suspension obtained in (1), and at room temperature, stir magnetically for 30 minutes to make the epoxy group of the silane coupling agent KH-560 and the branched polyethyleneimine The amino group of the group fully reacts and cross-links; wherein, the mass ratio of...

Embodiment 3

[0039] (1) Weigh 10 g of wood pulp cellulose micron wire suspension with a mass fraction of 1.1 wt%, add silane coupling agent KH-560 into the cellulose micron wire suspension, and hydrolyze with magnetic stirring for 2 h at room temperature and neutral conditions, The methoxy groups on the silane coupling agent KH-560 are fully hydrolyzed into silicon hydroxyl groups to obtain a mixed suspension; wherein, the mass ratio of cellulose micron wires to silane coupling agent KH-560 is 1:1.

[0040] (2) Prepare an aqueous solution of branched polyethyleneimine (molecular weight: 1200) with a concentration of 25 wt % with deionized water. At room temperature, add the branched polyethyleneimine aqueous solution to the mixed suspension obtained in (1), and at room temperature, stir magnetically for 30 minutes to make the epoxy group of the silane coupling agent KH-560 and the branched polyethyleneimine The amino group of the group fully reacts and cross-links; wherein, the mass ratio ...

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Abstract

The invention relates to multiple chemical crosslinking reinforced cellulose aerogel and a preparation method thereof. A mass ratio of cellulose microwires to a silane coupling agent KH-560 in the aerogel is 1:0.5-1:2, and a mass ratio of the cellulose microwires and branched polyethylenimine is 1:0.5-1:2. The preparation method includes: adding the silane coupling agent KH-560 into a cellulose microwire suspension, and stirring to obtain a mixed suspension; adding a branched polyethylenimine water solution into the mixed suspension, stirring to obtain mixed liquid, freezing, drying, and backing to obtain the multiple chemical crosslinking reinforced cellulose aerogel. The cellulose aerogel is high in mechanical strength and flexibility and has a porous netty structure uniform in shape, the preparation process is simple, raw materials are extensive in source, and the cellulose aerogel is environment-friendly and has wide application prospect in the field of carrier materials, sensing and detecting, adsorption and heat insulation.

Description

technical field [0001] The invention belongs to the field of cellulose airgel and its preparation, in particular to a multi-chemically cross-linked reinforced cellulose airgel and its preparation method. Background technique [0002] Airgel is a highly porous material with a three-dimensional network structure. Because of its high specific surface area, low density, high porosity and other advantages, it is widely used in the fields of heat insulation materials, sound-absorbing materials, carrier materials and sensor detection. Cellulose is the most widely distributed and abundant natural polymer in nature, which is renewable and degradable. Compared with synthetic polymers, cellulose has the characteristics of non-toxic, non-polluting, easy to modify, good biocompatibility, and renewable, and is considered to be the most important chemical and energy raw material in the future world. With the increasing environmental problems and energy crisis, the research on cellulose-b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08L1/02C08L79/02
CPCC08J3/246C08J2301/02C08J2379/02C08J2401/02C08J2479/02
Inventor 隋晓锋成欢李营战毛志平徐红张琳萍钟毅
Owner DONGHUA UNIV
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