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Preparation method of high-strength cellulose/bentonite composite hydrogel

A technology of composite hydrogel and cellulose, applied in the field of preparation of high-strength cellulose/bentonite composite hydrogel, can solve the problems of limited improvement of mechanical properties, unfavorable promotion and production, unfavorable production practice, etc., and achieves low cost, Excellent mechanical properties and easy operation

Active Publication Date: 2020-03-06
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of interpenetrating network hydrogel requires the use of a large number of chemical reagents, which has the disadvantages of complex production process and high cost, which is not conducive to the promotion of production; nanocomposite hydrogel requires the use of some expensive nanoparticles, which is costly and expensive. It is beneficial to production practice; although the cost of physical and chemical cross-linked hydrogel is relatively low, however, this method in the prior art has very limited improvement in mechanical properties

Method used

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  • Preparation method of high-strength cellulose/bentonite composite hydrogel
  • Preparation method of high-strength cellulose/bentonite composite hydrogel
  • Preparation method of high-strength cellulose/bentonite composite hydrogel

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Sodium hydroxide, urea, and deionized water are prepared as 7wt% / 12wt% / 81wt% by mass ratio to obtain 97g mixed solvent, then after mixed solvent is precooled to-12 ℃, add 3g filter paper fiber ( General Electric Biotechnology Co., Ltd., model 102), dissolved to obtain a 3wt% cellulose solution; at room temperature, add 1,4-butanediol diglycidyl ether and bentonite particles (Jin Tenglong Industrial Co., Ltd., model 828), wherein , the mass ratio of cellulose to 1,4-butanediol diglycidyl ether is 1:0.5, the mass ratio of cellulose to bentonite particles is 10:1, stir well and centrifuge at 5000rpm for 5min, then cross-link at 30°C React for 4 hours; dialyze the obtained cellulose hydrogel in deionized water for 4 days, and change the water every 4 hours to obtain a high-strength cellulose / bentonite composite hydrogel.

[0045] figure 2 It is a photo of the high-strength cellulose / bentonite composite hydrogel prepared in Example 1. shows the prepared cellulose hydrogel...

Embodiment 2

[0047] Sodium hydroxide, urea, and deionized water are prepared as 7wt% / 12wt% / 81wt% by mass ratio to obtain 97g mixed solvent, then after mixed solvent is precooled to-12 ℃, add 3g filter paper fiber ( General Electric Biotechnology Co., Ltd., model 102), dissolved to obtain a 3wt% cellulose solution; at room temperature, add 1,4-butanediol diglycidyl ether and bentonite particles (Jin Tenglong Industrial Co., Ltd., model 828), wherein , the mass ratio of cellulose to 1,4-butanediol diglycidyl ether is 1:0.5, the mass ratio of cellulose to bentonite particles is 5:1, stir well and centrifuge at 5000rpm for 5min, then cross-link at 30°C React for 4 hours; dialyze the obtained cellulose hydrogel in deionized water for 4 days, and change the water every 4 hours to obtain a high-strength cellulose / bentonite composite hydrogel.

Embodiment 3

[0049] Sodium hydroxide, urea, and deionized water are prepared as 7wt% / 12wt% / 81wt% by mass ratio to obtain 97g mixed solvent, then after mixed solvent is precooled to-12 ℃, add 3g filter paper fiber ( General Electric Biotechnology Co., Ltd., model 102), dissolved to obtain a 3wt% cellulose solution; at room temperature, add 1,4-butanediol diglycidyl ether and bentonite particles (Jin Tenglong Industrial Co., Ltd., model 828), wherein , the mass ratio of cellulose to 1,4-butanediol diglycidyl ether is 1:0.5, the mass ratio of cellulose to bentonite particles is 10:3, stir well and centrifuge at 5000rpm for 5min, then cross-link at 30°C React for 4 hours; dialyze the obtained cellulose hydrogel in deionized water for 2 to 5 days, and change the water every 4 hours to obtain a high-strength cellulose / bentonite composite hydrogel.

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Abstract

The invention discloses a preparation method of a high-strength cellulose / bentonite composite hydrogel. The method includes the steps of: (1) preparing a mixed solvent of strong base, urea and water,conducting pre-cooling to a temperature ranging from -15DEG C to -5DEG C, adding cellulose, and mixing the substances uniformly to obtain a cellulose solution; (2) mixing a cross-linking agent, bentonite particles and the cellulose solution obtained in step (1), and carrying out cross-linking reaction at 25-50DEG C for 2-6h to obtain a cross-linking reaction product; and (3) placing the cross-linking reaction product obtained in step (2) in water for dialysis to obtain the high-strength cellulose / bentonite composite hydrogel. According to the preparation method of the high-strength cellulose / bentonite composite hydrogel provided by the invention, the prepared cellulose composite hydrogel has excellent mechanical properties and excellent cellulose structure, solves the technical problem ofpoor mechanical properties of cellulose hydrogel prepared by a traditional preparation method, has wide application prospects, and also has the advantages of simple operation, economical efficiency and environmental protection, and low cost.

Description

technical field [0001] The invention relates to a preparation method of high-strength cellulose / bentonite composite hydrogel, belonging to the field of polymer functional materials. Background technique [0002] Hydrogel is a kind of hydrophilic polymer with three-dimensional network structure formed by physical or chemical crosslinking, which can absorb a large amount of water but is insoluble in water. However, the poor mechanical properties of conventional hydrogels limit their applications. At present, the shortcomings of poor mechanical strength of traditional hydrogels can be improved by different methods, among which the most representative ones are interpenetrating network hydrogels, nanocomposite hydrogels, and physicochemical crosslinked hydrogels. The preparation process of interpenetrating network hydrogel requires the use of a large number of chemical reagents, which has the disadvantages of complex production process and high cost, which is not conducive to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L1/02C08K3/34
CPCC08J3/075C08J2301/02C08K3/346
Inventor 刘鹤王思恒杨欣欣商士斌宋湛谦
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY