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Hydroscopic cellulose hydrogel and preparation method thereof

A cellulose hydrogel and water-absorbing technology, applied in the field of polymer materials, can solve the problems of non-biodegradable production and application, lack of strength, and limited development, and achieve easy recycling, simple and convenient operation, and beneficial The effect of industrial production

Inactive Publication Date: 2011-04-20
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

What have been reported are mainly synthetic polymer hydrogels, which are not biodegradable and their production and application are limited
However, the reports about cellulose hydrogel are all based on the derivatized derivatives of cellulose as raw materials, which cannot obtain good strength.
Therefore, the further development of such materials is limited

Method used

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  • Hydroscopic cellulose hydrogel and preparation method thereof
  • Hydroscopic cellulose hydrogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Disperse 3 g of carboxymethyl cellulose in 97 g of a mixed aqueous solution containing 6 wt% NaOH and 4 wt% urea, and stir evenly at room temperature until the carboxymethyl cellulose is dissolved. 3 grams of cellulose (viscosity average molecular weight M η =3.5×10 4 ) is dispersed in 97 grams of mixed aqueous solution containing 6wt% NaOH and 4wt% urea, pre-cooled to -20--10°C, thawed and stirred after 5-24 hours to obtain a transparent cellulose solution. Get 90g carboxymethyl cellulose solution and 10g cellulose solution and mix, wherein the weight ratio of carboxymethyl cellulose and cellulose is 9: 1, and carboxymethyl cellulose and cellulose account for 3% of solution together. 10ml of epichlorohydrin was added dropwise into 100g of the mixed solution, and the temperature was raised to 60°C. After 2 hours, a water-absorbing cellulose hydrogel with a weight ratio of carboxymethylcellulose and cellulose of 9:1 was obtained. The water absorption rate is 1000g / g. ...

Embodiment 2

[0012] Disperse 3 g of carboxymethyl cellulose in 97 g of a mixed aqueous solution containing 8 wt% NaOH and 10 wt% urea, and stir evenly at room temperature until the carboxymethyl cellulose is dissolved. 3 grams of cellulose (viscosity average molecular weight M η =3.5×10 4 ) is dispersed in 97 grams of a mixed aqueous solution of 8wt% NaOH and 10wt% urea, pre-cooled to -20--10°C, thawed and stirred after 5-24 hours to obtain a transparent cellulose solution. Get 80g carboxymethyl cellulose solution and 20g cellulose solution and mix, wherein the weight ratio of carboxymethyl cellulose and cellulose is 8: 2, and carboxymethyl cellulose and cellulose account for 3% of solution together. Add 10 ml of epichlorohydrin dropwise into 100 g of the mixed solution, raise the temperature to 50° C., and obtain a water-absorbing cellulose hydrogel with a weight ratio of carboxymethyl cellulose and cellulose of 8:2 after 6 hours. The water absorption rate is 800g / g.

Embodiment 3

[0014] Disperse 3 g of carboxymethyl cellulose in 97 g of a mixed aqueous solution containing 6 wt% NaOH and 4 wt% urea, and stir evenly at room temperature until the carboxymethyl cellulose is dissolved. 3 grams of cellulose (viscosity average molecular weight M η =3.5×10 4 ) is dispersed in 97 grams of mixed aqueous solution containing 6wt% NaOH and 4wt% urea, pre-cooled to -20--10°C, thawed and stirred after 5-24 hours to obtain a transparent cellulose solution. Get 70g carboxymethyl cellulose solution and 30g cellulose solution and mix, wherein the weight ratio of carboxymethyl cellulose and cellulose is 7: 3, and carboxymethyl cellulose and cellulose account for 3% of solution together. 10ml of epichlorohydrin was added dropwise to 100g of the mixed solution, and the temperature was raised to 40°C. After 10 hours, a water-absorbing cellulose hydrogel with a weight ratio of carboxymethylcellulose and cellulose of 7:3 was obtained. The water absorption rate is 500g / g.

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Abstract

The invention relates to a hydroscopic cellulose hydrogel and a preparation method thereof. The preparation method of the hydrogel is as follows: carboxymethyl cellulose and cellulose are respectively dissolved in the water solution of NaOH / urea in which the concentration of NaOH is 6-10wt%, and the concentration of the urea is 4-12wt%; the NaOH / urea mixed water solution of 1-5wt% of the carboxymethyl cellulose and the NaOH / urea mixed water solution of 1-5wt% of the cellulose are obtained; then the NaOH / urea mixed water solution of the carboxymethyl cellulose and the NaOH / urea mixed water solution of cellulose are mixed according to the weight ratio: 9:1-1:9 and stirred evenly, and the mixed solution is obtained; the mixed solution is also added with certain amount of cross linker epoxy chloropropane; after the chemical cross linking reaction, the mixed solution is placed at the gelatin temperature until the hydroscopic cellulose hydrogel is formed, wherein, the water absorbing capacity is 50-1,000g / g. The hydrogel has very good salt sensitivity and high hydroscopicity and is capable of being widely used in the fields of agriculture, health care and medicine.

Description

technical field [0001] The invention relates to a water-absorbing cellulose hydrogel and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Plant cellulose is the most abundant renewable resource on earth, and carboxymethyl cellulose is a derivative of cellulose, which, like cellulose, is an environmentally friendly material. Making full use of cellulose and carboxymethyl cellulose can not only protect the environment, but also save limited petroleum resources. Recently, the preparation and application of hydrogels have developed rapidly, and their many advantages such as water absorption, environmental sensitivity, water retention, and biocompatibility have attracted much attention. What have been reported are mainly synthetic polymer hydrogels, which cannot be biodegraded so that their production and application are limited. However, the reports about cellulose hydrogel are all based on the derivatized derivatives of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08L1/26C08L1/02C08B15/10
Inventor 张俐娜常春雨
Owner WUHAN UNIV
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