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Method for preparing acrylic acid series semi-interpenetration network composite high water absorption resin

A super absorbent resin, semi-interpenetrating network technology, used in absorbent pads, medical science, bandages, etc., can solve the problems of easy accumulation into agglomerates, insufficient water absorption capacity, and difficult biodegradation of synthetic resins. The formation of voids, the simplification of post-processing operations, and the effect of improving stripping activity

Inactive Publication Date: 2009-12-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Starch products have poor heat resistance, insufficient long-term water retention, easy to accumulate into agglomerates after absorbing water, and are easy to rot, making it difficult to store for a long time. The water absorption capacity is not strong enough, so it is limited in use; synthetic resin systems are usually not easy to biodegrade, which is not conducive to environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 4.444g of sodium hydroxide, dissolve it with 20g of deionized water, then slowly add it dropwise in 10g of acrylic acid in an ice-water bath, and stir while adding it until the reaction is complete, and the degree of neutralization is 80%.

[0034] (2) Add 3g of acrylamide, 0.5g of 2-hydroxyethyl acrylate, 3g of methanol, a solid content of 1g of polyvinyl alcohol aqueous solution, and 1g of organic montmorillonite to the solution prepared in (1), and vibrate with ultrasonic waves Disperse for 3h.

[0035] (3) Dissolve 0.006g of ammonium persulfate and 0.01g of N,N'-methylenebisacrylamide in 15g of deionized water, mix well with the mixture obtained in (2), and set aside.

[0036] (4) Weigh 0.2g of Span60 and dissolve it in 30g of cyclohexane, then add the mixture obtained in (3), fill with nitrogen, stir evenly, then raise the temperature to 75°C, and react at constant temperature for 5h.

[0037] (5) Add dropwise 15 g of methanol-ethanol mixed solution with...

Embodiment 2

[0044] (1) Weigh 4.472g of potassium hydroxide, dissolve it with 25g of deionized water, then slowly add it dropwise in 10g of acrylic acid in an ice-water bath, and stir while adding it until the reaction is complete, and the degree of neutralization is 70%.

[0045] (2) Add 5g of acrylamide, 1g of 2-hydroxyethyl acrylate, 3.5g of methanol, 1.5g of polyvinylpyrrolidone aqueous solution and 0.5g of organic diatomaceous earth into the solution obtained in (1). Ultrasonic vibration disperses for 2h.

[0046] (3) Dissolve 0.08g of ammonium persulfate and 0.06g of N,N'-methylenebisacrylamide in 20g of deionized water, mix with the mixture obtained in (2), and set aside.

[0047] (4) Weigh 0.25g of Span60 and dissolve it in 35g of cyclohexane, then add the mixture obtained in (3), fill it with nitrogen, stir evenly, then raise the temperature to 80°C, and react at constant temperature for 4h.

[0048] (5) In the reaction system obtained in (4), add dropwise 20 g of methanol-ethano...

Embodiment 3

[0055] (1) Weigh 4.444g of sodium hydroxide, dissolve it with 35g of deionized water, then slowly add it dropwise in 10g of acrylic acid in an ice-water bath, and stir while adding it until the reaction is complete, and the degree of neutralization is 80%.

[0056] (2) Add 10g of acrylamide, 0.5g of 2-hydroxyethyl acrylate, 1.5g of methanol, 3g of polyethylene glycol 6000 aqueous solution, 2g of organic montmorillonite in the solution obtained in (1), Use ultrasonic vibration to disperse, and the dispersion time is 5h.

[0057] (3) Dissolve 0.12g of potassium persulfate and 0.05g of N,N'-methylenebisacrylamide in 20g of deionized water, mix with the mixture obtained in (2), and set aside.

[0058] (4) Weigh 0.25g of Span60 and 0.05g of Tween20 and dissolve in 60g of cyclohexane, then add the mixture obtained in (3), fill with nitrogen, stir evenly, then raise the temperature to 70°C, and react at constant temperature for 6h.

[0059] (5) Add dropwise 30 g of methanol-ethanol ...

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Abstract

A preparation for semi-interpenetrating network complex highly water absorbable resin of acrylic acid series, relates to a preparation of complex resin with high water absorption by reverse suspension polymerization and in-situ polymerization, which includes adding aqueous solution of neutralizer into acrylic acid in ice-water bath, adding acrylamide, acrylic acid-2-hydroxyethyl ester, methanol, aqueous solution of hydrophilic polymer and modified organic silicate in layered form, dispersing by ultrasonic oscillation, adding initiator and cross-linker; dissolving dispersant in organic dispersion medium, then adding it into the mixture, reacting under protection of nitrogen gas; adding mixture of methanol and ethanol, adding organic silicate in layered form after stirring, depositing after adding methanol at room temperature, filtering, scrubbing with methanol, drying in vacuum to obtain final product. The prepared complex highly water absorbable resin has a water absorbency of 200-1800 g / g, brine absorbency of 40-160 g / g, water absorbing rate namely time spent until water absorb degree reaches 80% is 8-60min.

Description

technical field [0001] The invention relates to a preparation method of composite water-absorbent resin, in particular to a preparation method of acrylic semi-interpenetrating network composite superabsorbent resin. Background technique [0002] Superabsorbent resin is a kind of hydrophilic but water-insoluble, slightly cross-linked polymer, which can absorb water tens or even thousands of times higher than itself. Different from traditional water-absorbing materials, because superabsorbent resin has excellent water-retaining capacity, it is difficult to lose the water absorbed even under pressure and high temperature. Sustained release materials and other fields have been widely used. Among them, the application of superabsorbent resin in sanitary products accounts for more than 80% of the total production. The production process of acrylic superabsorbent resin is simple and the price is moderate, and it has become the most widely used synthetic superabsorbent resin. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/56C08F2/38C08F2/44C08F4/30C08K9/06C08F220/28A61L15/24
Inventor 戴李宗雷光财刘艳玲杨柯佳丁霖桐许一婷
Owner XIAMEN UNIV
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