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Cellulose sulfate hydrogel and preparation method thereof

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

Active Publication Date: 2015-09-16
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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  • Cellulose sulfate hydrogel and preparation method thereof
  • Cellulose sulfate hydrogel and preparation method thereof
  • Cellulose sulfate hydrogel and preparation method thereof

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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] Put the wood pulp cellulose in a three-necked flask, and slowly add 1 mol / mol AGU (AGU, anhydro glucose unit) chlorosulfonic acid-dimethylformamide complex esterification agent (chlorosulfuric acid) dropwise at 20°C The volume fraction of the acid is 10%). After reacting for 5 hours, the product was washed with 500ml of...

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 (chlorosulfuric acid) dropwise at 15°C The volume fraction of the acid is 12%). After reacting for 3 hours, the product was washed with 500ml of absolu...

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 (chlorosulfuric acid) was slowly added dropwise at 10°C. The volume fraction of the acid is 15%). After reacting for 5 hours, the product was washed with a...

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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 comprises the following steps: mixing cellulose and a sulfating agent for a sulfating reaction to obtain cellulose sulfate; suspending the cellulose sulfate in deionized water, and stirring until the solution is transparent; adjusting the pH value; adding glycerin and zwitterion as crosslinking agents, and stirring and mixing uniformly; and cooling and standing to obtain the cellulose sulfate hydrogel. According to the invention, by adopting mild low acid and long-time controllable sulfating, the molecular weight of the product is high; and by adding glycerin and zwitterion for crosslinking, the strength of the cellulose sulfate hydrogel is enhanced, and an important supplement effect is realized on the functional application of cellulose.

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 Applications(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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