A kind of cellulose sulfate hydrogel and preparation method thereof

A technology of cellulose sulfate and hydrogel, which is applied in the field of gel materials, can solve the problems of unreported research on cellulose ester hydrogel, and achieve increased strength, dense three-dimensional network structure, and hydrogel strength. Increased effect

Active Publication Date: 2017-10-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, most of the currently researched cellulose-based hydrogels are regenerated cellulose and cellulose ethers. U.S. Patent US8871016 (B2) discloses a method for preparing cellulose hydrogels. Chinese patent CN101903407A relates to cellulose Derivatives and their hydrogels, but the research on cellulose ester hydrogels has not been reported

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  • A kind of cellulose sulfate hydrogel and preparation method thereof
  • A kind of cellulose sulfate hydrogel and preparation method thereof
  • A kind of cellulose sulfate hydrogel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] A kind of preparation method of cellulose sulfate hydrogel of the present embodiment, concrete operation steps are as follows:

[0034] Dimethylformamide (DMF) was used Molecular sieves are dried to remove moisture, placed in a four-necked flask with a condenser tube and a stirring device in an ice-water mixing bath, and chlorosulfonic acid is slowly added dropwise to dimethylformamide at a rate of 10 drops / min to mix the two For the reaction, dry nitrogen gas was introduced during the reaction, and magnetic stirring was performed at a stirring speed of 100 r / min, and the resulting solution was transferred to an Erlenmeyer flask for later use.

[0035] The wood pulp cellulose was placed in a three-necked flask, and 1 mol / mol AGU (AGU, anhydroglucose unit) chlorosulfonic acid-dimethylformamide complex esterification agent (chlorosulfonic acid The volume fraction is 10%). After reacting for 5 hours, the product was washed with 500ml of absolute ethanol, and then freeze-...

Embodiment 2

[0039] A kind of preparation method of cellulose sulfate hydrogel of the present embodiment, concrete preparation steps are as follows:

[0040] Dimethylformamide (DMF) was used Molecular sieves are dried to remove moisture, placed in a four-necked flask with a condenser tube and a stirring device in an ice-water mixing bath, and chlorosulfonic acid is slowly added dropwise to dimethylformamide at a rate of 10 drops / min to mix the two For the reaction, dry nitrogen gas was introduced during the reaction, and magnetic stirring was performed at a stirring speed of 100 r / min, and the resulting solution was transferred to an Erlenmeyer flask for later use.

[0041] Put the cotton cellulose in a three-necked flask, slowly add 0.8mol / mol AGU (AGU, anhydroglucose unit) chlorosulfonic acid-dimethylformamide complex esterification agent (chlorosulfonic acid) dropwise at 15°C The volume fraction is 12%). After reacting for 3 hours, the product was washed with 500ml of absolute ethanol, ...

Embodiment 3

[0044] A kind of preparation method of cellulose sulfate hydrogel of the present embodiment, concrete preparation steps are as follows:

[0045] Dimethylformamide (DMF) was used Molecular sieves are dried to remove moisture, placed in a four-necked flask with a condenser tube and a stirring device in an ice-water mixing bath, and chlorosulfonic acid is slowly added dropwise to dimethylformamide at a rate of 10 drops / min to mix the two For the reaction, dry nitrogen gas was introduced during the reaction, and magnetic stirring was performed at a stirring speed of 100 r / min, and the resulting solution was transferred to an Erlenmeyer flask for later use.

[0046] Hemp cellulose was placed in a three-necked flask, and 1.2mol / mol AGU (AGU, anhydroglucose unit) chlorosulfonic acid-dimethylformamide complex esterification agent (chlorosulfonic acid The volume fraction is 15%). After reacting for 5 hours, the product was washed with absolute ethanol, and then freeze-dried to obtain...

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Abstract

The invention belongs to the technical field of gel materials, and discloses a cellulose sulfate hydrogel and a preparation method thereof. The preparation method of the hydrogel is as follows: mixing cellulose and a sulfation agent for sulfation reaction to obtain cellulose sulfate; then suspending the cellulose sulfate in deionized water and stirring until the solution is transparent, Adjust the pH, add glycerin and anions and cations as cross-linking agents, stir and mix evenly, cool down and let stand to obtain cellulose sulfate hydrogel. The gentle low-acid, long-time, controllable sulfation adopted by the present invention has a high molecular weight product, and cross-linking by adding glycerin and anions and cations improves the strength of cellulose sulfate hydrogel, and is effective for the cellulose sulfate hydrogel. Functionalized applications have an important complementary role.

Description

technical field [0001] The invention belongs to the technical field of gel materials, and in particular relates to a cellulose sulfate hydrogel and a preparation method thereof. Background technique [0002] Cellulose is a natural renewable resource with rich sources and wide distribution in nature, and is widely used in chemical, food, material, textile, pharmaceutical and other industries. However, there are a large number of hydrogen bonds in the cellulose molecular chain, which is prone to self-agglomeration to form a fibril structure, and also prone to multiple irregular coils to form high-crystallinity fibers. However, the originally active hydroxyl group in the cellulose glucose unit is blocked in the crystalline region, which reduces its activity and limits its application. Therefore, it is necessary to functionally modify cellulose to reduce its self-agglomeration and enhance its reactivity. [0003] Cellulose sulfate is a cellulose derivative with good shear resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08J3/24C08L1/16C08B5/14
Inventor 王兆梅胡蝶廖伟
Owner SOUTH CHINA UNIV OF TECH
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