Preparation method of cellulose ultra-strong water-absorbent resin

A technology of water-absorbent resin and cellulose is applied in the field of preparation of water-absorbent resin to achieve the effects of satisfying application requirements, mild process conditions and simple preparation method

Inactive Publication Date: 2013-05-29
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Publication No. CN1073576C discloses a "manufacturing method of composite superabsorbent resin", in the presence of co-solvent urea or thiourea, by acrylic acid, polysaccharide The water-absorbing resin synthesized by the polymerization reaction of polyalcohol polyvinyl alcohol and polyalcohol unsaturated monocarboxylate butanediol diacrylate or diethylene glycol diacrylate as a cross-linking agent has a water absorption rate of 500 Left and right, not only the reaction composition is very complex, but also these raw materials are very expensive, difficult to popularize and apply
[0005] Publication No. CN100366708C discloses a "synthesis method of nanometer dispersible carboxymethylcellulose-acrylic polymer water-absorbing resin", using acrylic acid, carboxymethyl fiber The water-absorbing resin synthesized by N, N-methylene bisacrylamide and n-hexane sulfate type surfactant, the reaction is carried out under the condition of nitrogen gas, the water absorption rate can reach up to 800, and the raw material used is carboxymethyl Cellulose, N,N-methylene bisacrylamide and n-hexane sulfate surfactants are expensive and complicated to operate
[0006] In the existing published literature, the Journal of Functional Polymer Science 2004, 17 (3): 473-47 reported that the mass ratio of starch to acrylate was 40 / 100, N, N-bis-methylenebisacrylamide is used as a cross-linking agent to obtain a water-absorbent resin with a water absorption rate of only 400. Not only is the water absorption rate low, the cross-linking agent N, N-bis-methylene bis-propylene The price of amides is also high, resulting in high cost of synthetic resins, making it difficult to apply on a large scale
[0007] In addition, in the available existing methods for preparing superabsorbent resins, there are deficiencies in that the raw materials used in the preparation are expensive and the process is complicated. Adding a certain proportion of cellulose to replace fossil raw materials, and seeking a cheap and easy-to-obtain cross-linking agent to cross-link with cellulose to synthesize water-absorbent resin is undoubtedly to overcome the high cost of preparing water-absorbent resin, which is not suitable for large-scale production. An effective way to apply large-scale production to agriculture, forestry and industrial ills

Method used

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  • Preparation method of cellulose ultra-strong water-absorbent resin
  • Preparation method of cellulose ultra-strong water-absorbent resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 100g of cellulose with a particle size of 125 microns, add 500g of deionized water, stir for 30min, add 6g of aluminum hydroxide with a particle size of 50 microns ， Raise the temperature to 60°C, then add 0.5g of (NH 4 ) 2 S 2 o 8 Stir with 110g of sodium acrylate aqueous solution until uniform, heat up to 85°C for reaction, stop heating, cool to room temperature, wash with deionized water three to four times and dry at 105°C for 24 hours , synthetic superabsorbent resin. The water absorption of synthetic resin was determined according to the method described in the literature (SM Ma, MZ Liu, LX Cao, et al. Funct. Polym., 2003, 16: 502-506). The resin synthesized by the above method is measured, and the water absorption rate reaches 975g per gram of resin. The appearance of the product and resin after absorbing water can be seen figure 1 and figure 2 .

Embodiment 2

[0021] Take 100g of cellulose with a particle size of 150 microns, add 700g of deionized water, stir for 30min, add 9g of aluminum hydroxide with a particle size of 10 microns ， Heat up to 60°C, then add 4g of (NH 4 ) 2 S 2 o 8 and 150g of sodium acrylate aqueous solution, stirred until uniform, heated up to 90°C, when gel-like viscous appeared during the reaction, stop heating, cooled to room temperature, washed three to four times with deionized water and dried at 100°C for 24h, The resulting resin can absorb 910 grams of water per gram.

Embodiment 3

[0023] Take 100 g of cellulose with a particle size of 177 microns, add 700 g of deionized water, stir for 30 minutes, add 5 g of aluminum hydroxide with a particle size of 30 microns, heat up to 50 ° C, and then add 3 g of (NH 4 ) 2 S 2 o 8 Stir with 160g of sodium acrylate aqueous solution until uniform, heat up to 70°C for reaction, stop heating, cool to room temperature, wash with deionized water three to four times and dry at 90°C for 24 hours , The obtained resin can absorb 960g of water per gram.

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Abstract

The invention discloses a preparation method of cellulose ultra-strong water-absorbent resin, which comprises the following steps of: adding deionized water into cellulose; stirring, adding Al(OH)3 and heating; adding (NH4)2S2O8 and sodium acrylate aqueous solution, stirring and heating for reaction; after colloidal dope appears during the reaction, stopping the heating and cooling to room temperature; and washing the product with deionized water and drying to obtain the ultra-strong water-absorbent resin. The method disclosed by the invention adopts cellulose and Al(OH)3 to synthesize resin, and has abundant resources and low price; the reaction does not need a protective gas, the conditions are moderate, and the use value of cellulose is greatly increased; and the prepared resin is particularly suitable for the water retention and water conservation in an arid region in heavy demand and can be used as a medical water-absorbent material.

Description

technical field [0001] The present invention relates to a kind of preparation method of water-absorbent resin, especially a kind of preparation method with cellulose and Al(OH) 3 A method of preparing a water-absorbent resin as a raw material. technical background [0002] Superabsorbent resins are mainly prepared by polymerization methods such as starch, carboxymethyl cellulose, and acrylic acid in existing methods. The preparation of water-absorbent resin from starch has the disadvantages of competing with humans for food, and it is difficult to use it on a large scale in agriculture; to prepare resin from carboxymethyl cellulose, the carboxymethyl cellulose used is grafted with carboxymethyl on the fiber through a chemical reaction. The price is relatively expensive, which restricts the large-scale application of superabsorbent resin; while the acrylic acid is used as raw material to prepare water-absorbent resin, because its acrylic acid is obtained by oxidation of fos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F220/06
Inventor 曹青杨文英王雷利赵红靳利娥
Owner TAIYUAN UNIV OF TECH
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