Method for preparing polyacrylic acid high-water-absorptivity resin microspheres by reversed phase suspension polymerization

A super absorbent resin, reversed-phase suspension technology, applied in the field of functional polymer material synthesis, can solve problems such as easy generation of gel blocks, and achieve the effects of good quality, simple preparation method and stable system

Inactive Publication Date: 2014-02-05
CNOOC ENERGY TECH & SERVICES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been reports in the literature on the stability control process for inverse suspension polymerization systems, but most of them use a single type of dispersant, and the system is still prone to gel blocks in the end

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Fully dissolve 1.70g Span80 and 1.5g Span60 in 100g cyclohexane solution, add it into a 250ml three-necked flask, start stirring, raise the temperature to 45°C, and continue to pass nitrogen for half an hour. Add 0.3g of crosslinking agent, 0.05g of initiator and 17g of comonomer acrylamide to the neutralized acrylic acid solution (18g of acrylic acid, 40g of water and 8g of sodium hydroxide), stir well to dissolve it, and then add 2 drops / Add the prepared acrylic acid solution dropwise into the three-necked flask at a speed of s. After the drop, the temperature was raised to 60° C. for 4 hours, and the reaction solution became viscous, indicating that the end point of the reaction was reached. After the reaction was finished, it was washed with methanol, then dried in an oven, lightly ground, and vacuum-dried at 90° C. for 10 hours to obtain a white powdery superabsorbent resin.

[0023] The resin is in the shape of microspheres, with a particle size of 0.23 microns,...

Embodiment 2

[0025] Fully dissolve 1.70g of Span80 and 1.2g of Span40 in 100g of cyclohexane solution, add it into a 250ml three-neck flask, start stirring, raise the temperature to 45°C, and continue to pass nitrogen for half an hour. Add 0.3g of crosslinking agent, 0.05g of initiator and 16g of comonomer acrylamide to the neutralized acrylic acid solution (19g of acrylic acid, 40g of water and 8g of sodium hydroxide), stir well to dissolve it, and then add 2 drops / Add the prepared acrylic acid solution dropwise into the three-necked flask at a speed of s. After the drop, the temperature was raised to 60° C. for 4 hours, and the reaction solution became viscous, indicating that the end point of the reaction was reached. After the reaction was finished, it was washed with methanol, then dried in an oven, lightly ground, and vacuum-dried at 90° C. for 10 hours to obtain a white powdery superabsorbent resin.

[0026] The resin is in the shape of microspheres, with a particle size of 0.28 m...

Embodiment 3

[0028] Fully dissolve 1.70g of Span80 and 1g of hexadecyl phosphate in 100g of cyclohexane solution, add it into a 250ml three-neck flask, start stirring, raise the temperature to 45°C, and continue to pass nitrogen for half an hour. Add 0.3g of crosslinking agent, 0.05g of initiator and 16g of comonomer acrylamide to the neutralized acrylic acid solution (19g of acrylic acid, 40g of water and 8g of sodium hydroxide), stir well to dissolve it, and then add 2 drops / Add the prepared acrylic acid solution dropwise into the three-necked flask at a speed of s. After the drop, the temperature was raised to 60° C. for 4 hours, and the reaction solution became viscous, indicating that the end point of the reaction was reached. After the reaction was finished, it was washed with methanol, then dried in an oven, lightly ground, and vacuum-dried at 90° C. for 10 hours to obtain a white powdery superabsorbent resin.

[0029] The resin is in the shape of microspheres, with a particle siz...

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PUM

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Abstract

The invention discloses a method for preparing polyacrylic acid high-water-absorptivity resin microspheres by reversed phase suspension polymerization. According to the method, a comonomer, a dispersant, a crosslinking agent and an initiator used as main reactants are subjected to reversed phase suspension polymerization by using cyclohexane as a solvent to obtain the polyacrylic acid high-water-absorptivity resin microspheres, wherein the dispersant is selected from two or three of Span 80, Span 60, Span 40, hexadecyl phosphate and octadecyl phosphate. The method obviously enhances the stability of the reaction system, can implement one-step mass continuous preparation of the polyacrylic acid high-water-absorptivity resin microspheres, has the advantages of simple technique, no environmental pollution, low production cost and wide application range, and completely satisfies the industrialization requirements.

Description

technical field [0001] The invention relates to a method for preparing polyacrylic acid superabsorbent resin microspheres by reverse-phase suspension polymerization, and belongs to the technical field of synthesis of functional polymer materials. [0002] Background technique [0003] Super Absorbent Polymer (SAP) is a new type of functional polymer material, which was first invented in the 1960s. Because its molecular structure contains a large number of hydrophilic chemical groups, such as carboxyl, hydroxyamide, sulfonic acid, etc., these groups make it form a three-dimensional network structure with a certain cross-linking density, thus endowing this kind of high Molecular materials have unique water absorption and water retention properties, and they can absorb water equivalent to hundreds or even thousands of times their own weight (Zou Xinxi, super absorbent [M], Beijing: Chemical Industry Press, 1987). [0004] At present, superabsorbent resins are widely used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/56C08F2/32
Inventor 李鸣邓凯田建军马斐王安建陈昌青罗均龙杨君
Owner CNOOC ENERGY TECH & SERVICES
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