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Process for preparing chitosan base macroporous high water absorptive resin

A technology of superabsorbent resin and chitosan, applied in the field of preparation of resin with macroporous structure, chitosan-based macroporous superabsorbent resin

Inactive Publication Date: 2005-05-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solvent precipitation method is a new method of preparing macroporous superabsorbent resin invented by us. It can significantly increase the water absorption rate of the resin and reduce the residual amount of harmful monomers through a simple process. It has important practical significance. Currently, it is used This method has not been reported to modify superabsorbent resin

Method used

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  • Process for preparing chitosan base macroporous high water absorptive resin
  • Process for preparing chitosan base macroporous high water absorptive resin
  • Process for preparing chitosan base macroporous high water absorptive resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] After the chitosan powder is fully dissolved in 120 milliliters of 2% dilute acetic acid aqueous solution, add monomer 3.3wt% ammonium persulfate initiator under the protection of nitrogen and react at 65 ℃ for 30 minutes and then add the mass of chitosan Ratio is 10:1 acrylic acid monomer and monomer 0.16wt% N, N'-methylenebisacrylamide, stop reaction after reacting at 65 ℃ for 5.5 hours, the reaction system is washed with 20% sodium hydroxide aqueous solution After neutralization, use ethanol to precipitate the product, break the precipitate by stirring at a high speed of 2500 rpm, wash with ethanol repeatedly at this stirring speed, filter with suction and disperse the filter cake in a mixture of ethanol / water with a volume ratio of 4:1 Soak in a solvent for 24 hours for further purification, and vacuum-dry the filter cake after suction filtration to obtain a white powdery product. The distilled water absorption rate of this product can reach 1180 g / g, and the absorp...

Embodiment 2

[0026]After chitosan powder is fully dissolved in 120 milliliters of 2% dilute acetic acid aqueous solution, under nitrogen protection, add the potassium persulfate of monomer 2.5wt% and react at 60 ℃ after 30 minutes and add and chitosan mass ratio is 12:1 acrylic acid monomer and 0.14wt% N,N'-methylene bisacrylamide, stop the reaction after reacting at 60°C for 6 hours, and neutralize the reaction system with 20% aqueous sodium hydroxide solution Finally, precipitate the product with ethanol, crush the precipitate by stirring at a high speed of 2500 rpm, wash it repeatedly with ethanol at this stirring speed, filter with suction and disperse the filter cake in a mixed solvent of ethanol / water with a volume ratio of 4:1 After soaking for 24 hours for further purification, after suction filtration, the filter cake was vacuum-dried and crushed to obtain a white powdery product. The distilled water absorption rate of this product can reach 1065 g / g, and the absorbing rate of phy...

Embodiment 3

[0028] The reaction process of this embodiment is the same as that of Example 1, but the step of soaking the filter cake with ethanol / water mixed solvent for 24 hours is omitted. The distilled water absorption rate of the product prepared under this condition is 930 g / g, and the absorption rate of physiological saline can reach 102 g / g, and the residual amount of acrylic acid in the resin is 8.33×10 -3 %.

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Abstract

The present invention relates to the preparation process of chitosan base macroporous high water absorption resin. After chitosan is dissolved in dilute acetic acid solution, acrylic acid is made to graft on the molecular chain of chitosan under the initiation of ammonium or potassium persulfate and the product is cross-linked with cross-linking agent, so as to produce high water absorption chitosan grafted acrylic resin with distilled water absorption of 560-1210 g / g and physiological saline absorption of 76-125 g / g. The prepared resin is further modified via solvent deposition process to form macroporous structure to raise the water absorbing rate greatly. High efficiency liquid phase chromatographic test shows that the resin has greatly reduced acrylic acid monomer residue.

Description

Technical field: [0001] The invention relates to a preparation method of chitosan-based macroporous superabsorbent resin. Specifically, a superabsorbent resin is prepared by grafting and copolymerizing acrylic acid on the molecular chain of chitosan and then cross-linked, and modified by solvent precipitation to obtain a resin with a macroporous structure. The invention belongs to the field of polymer material synthesis. technical background: [0002] Superabsorbent resin is a new type of functional polymer material developed in recent years. It is a substance containing strong hydrophilic groups and a moderately cross-linked three-dimensional network structure on the microscopic level. It can absorb Water, saline and physiological fluids that are hundreds or even thousands of times their own weight. [0003] In 1973, the UCC company of the United States began to apply superabsorbent resin to agriculture, and then expanded to agriculture, forestry and gardening, soil water...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08J7/02
Inventor 谭惠民陈煜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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