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Synthetic method for instant-absorption type super absorbent resin

A technology of a superabsorbent resin and a synthesis method, which is applied in the production field of acrylic water-absorbent resins, can solve the problems of limiting the expansion of superabsorbent resins, the gelation barrier of high molecular polymers, the influence of liquid absorption rate, etc., so as to improve the gelation barrier phenomenon. , Improve the liquid absorption rate, the effect of simple synthesis conditions

Inactive Publication Date: 2013-11-27
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods, especially the water-absorbent resins synthesized by the aqueous solution polymerization method, have a common problem: the gelation and barrier phenomenon of high molecular polymers.
Surface cross-linking can effectively reduce the gel blocking effect, and the surface layer after cross-linking is also a hydrophilic structure, which can increase the liquid absorption rate of the super absorbent resin; but the surface cross-linking also limits the volume of the super absorbent resin when it absorbs liquid. Swells, so will have a negative impact on the uptake rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The synthetic method of this hydrophobic modified high-speed instantaneous absorption superabsorbent resin, its steps are as follows:

[0020] 1) Weigh 7g of acrylic acid, add 5g of distilled water to dilute, measure 8.2ml of 10mol / L sodium hydroxide solution, neutralize the two in an ice-water bath to obtain an aqueous solution of sodium acrylate with a neutralization degree of 80%, and weigh 2-acrylamide Base-methylpropanesulfonic acid 1g, potassium persulfate 0.072g, N,N'-methylenebisacrylamide 0.006g, placed in a glass container and stirred, placed at room temperature to obtain an aqueous phase solution;

[0021] 2) Measure 65ml of cyclohexane, add it to a 250ml three-necked flask equipped with a reflux condenser, a stirrer and a thermometer, then add 2.8g of Span-60, 1.3g of TX-100, 1g of vinyl acetate, and stir The temperature of the water bath was raised to 40°C to obtain 56 g of the oil phase solution;

[0022] 3) Heat the oil phase solution obtained in step 2)...

Embodiment 2

[0025] The synthetic method of this hydrophobic modified high-speed instantaneous absorption superabsorbent resin, its steps are as follows:

[0026] 1) Weigh 5g of acrylic acid, add 3g of distilled water to dilute, measure 6.1ml of 10mol / L sodium hydroxide solution, neutralize the two in an ice-water bath to obtain an aqueous solution of sodium acrylate with a neutralization degree of 85%, and weigh 2-acrylamide Base-methylpropanesulfonic acid 0.5g, acrylamide 0.5g, ammonium persulfate 0.051g, polyethylene glycol diacrylate (M=258) 0.0045g, placed in a glass container and stirred, placed at room temperature to obtain an aqueous phase solution;

[0027] 2) Measure 50ml of cyclohexane, add it to a 250ml three-necked flask equipped with a reflux condenser, a stirrer and a thermometer, then add 2.3g of Span-80, 0.5g of vinyl acetate, and stir in a water bath to raise the temperature to 40 °C, 52.8 g of oil phase solution was obtained;

[0028] 3) Heat the oil phase solution obt...

Embodiment 3

[0031] The synthetic method of this hydrophobic modified high-speed instantaneous absorption superabsorbent resin, its steps are as follows:

[0032] 1) Weigh 10g of acrylic acid, add 7g of distilled water to dilute, measure 11.8ml of 10mol / L sodium hydroxide solution, neutralize the two in an ice-water bath to obtain an aqueous solution of sodium acrylate with a neutralization degree of 80%, weigh dimethyl di Allyl ammonium chloride 1g, 2-acrylamido-methylpropanesulfonic acid 1g, potassium persulfate 0.10g, N,N'-methylenebisacrylamide 0.006g, placed in a glass container and stirred, at room temperature Placed to obtain an aqueous phase solution;

[0033] 2) Measure 60ml of toluene, add it to a 250ml three-necked flask equipped with a reflux condenser, a stirrer and a thermometer, then add 4g of Span-80, 1g of vinyl acetate into it, stir and raise the temperature to 40°C in a water bath to obtain an oil phase solution 57g;

[0034] 3) Heat the oil phase solution obtained in ...

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Abstract

The invention relates to a synthetic method for a high-speed instant-absorption type super absorbent resin. The synthetic method comprises the following steps: 1) adding a copolymerization water-soluble monomer, a cross-linking agent and an initiator into a mixed aqueous solution of acrylic acid and sodium hydroxide, placing an obtained mixture in a glass container and carrying out stirring so as to prepare a water phase solution; 2) with a dispersant as a continuous phase of inverse emulsion polymerization, adding the dispersant into a reaction flask and then adding an emulsifier and a copolymerization hydrophobic monomer to prepare an oil phase solution; and 3) adding the water phase solution into the oil phase solution drop by drop, carrying out mixing and high speed stirring for emulsification, allowing a temperature to gradually rise after uniform stirring of a system, wherein time for a later-period polymerization reaction is 2.5 to 3.5 h, cooling to room temperature after completion of the reaction and successively carrying out filtering, washing and vacuum drying so as to obtain the white powdery water-absorption resin. The invention has the following beneficial effects: since synthesis conditions are simple, the imbibition rate of the resin can be improved while high water absorbency is maintained.

Description

technical field [0001] The invention relates to the technical field of production of acrylic water-absorbing resins, in particular to a synthesis method of high-speed instant-absorbing superabsorbent resins. Background technique [0002] Sodium acrylate water-absorbent resin has been widely used in sanitary products, such as diapers, sanitary napkins, etc., for many years because of its excellent water-absorbing properties. application prospects. [0003] There are many ways to produce water-absorbent resin. Among the current water-absorbent resin manufacturers, except Sumitomo of Japan, which adopts the production process of suspension polymerization, the rest such as BASF, Degussa and domestic Haoyue all use aqueous solution polymerization. These methods, especially the water-absorbent resins synthesized by the aqueous solution polymerization method, have a common problem: the gelation and barrier phenomenon of high molecular polymers. The gel barrier phenomenon is that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F222/14C08F222/18C08F218/08C08F2/32
Inventor 吴江渝何紫莹黄维哲鄢国平李亮郭庆中
Owner WUHAN INSTITUTE OF TECHNOLOGY
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