Method for preparing super absorbent resin by inverse suspension polymerization

A technology of superabsorbent resin and reversed phase suspension, which is applied in the field of reversed phase suspension polymerization to prepare superabsorbent resin, which can solve problems such as instability of the reversed phase suspension polymerization system, implosion and agglomeration, difficult superabsorbent resin products, etc.

Active Publication Date: 2012-04-11
浙江卫星新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although people have done a lot of research on reversed-phase suspension polymerization, due to the instability of the reversed-phase suspension polymerization system, it is still prone to implosion and agglomeration during polymerization
Although the occurrence of implosion can be prevented by adjusting the dispersant, usually only fine powder or block products can be obtained, and it is difficult to directly obtain super absorbent resin products with an average particle size of 100-200 μm, so the performance of super absorbent resin is limited. will be affected, which in turn will be limited in application

Method used

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  • Method for preparing super absorbent resin by inverse suspension polymerization
  • Method for preparing super absorbent resin by inverse suspension polymerization
  • Method for preparing super absorbent resin by inverse suspension polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: 342.5 g of n-heptane was added to a 1 L five-necked round bottom flask equipped with a stirrer, a reflux condenser, a dropping funnel, a thermometer and a nitrogen inlet pipe. 0.75 g of triglycerol monostearate and 0.85 g of sorbitan stearate were added thereto, the temperature was raised to 50° C., and the mixture was uniformly dispersed at a stirring speed of 350 rpm.

[0049] Add 130 g of acrylic acid aqueous solution with a mass concentration of 75% (wt%) into a 500 ml Erlenmeyer flask. 130.2 g of a 32 wt% sodium hydroxide aqueous solution was added dropwise to the Erlenmeyer flask. Then, 0.5 g of potassium persulfate, 0.2 g of propylene glycol diglycidyl ether, and 0.12 g of hydroxyethyl cellulose were added thereto to obtain an aqueous solution of acrylic acid monomer.

[0050] The aqueous solution of acrylic acid monomer was added into the above-mentioned five-neck round bottom flask, and nitrogen gas was passed in for 30-60 minutes while stirring. ...

Embodiment 2

[0052] Embodiment 2: except that the consumption of tripolyglycerol monostearate and sorbitan stearate is changed into 0.9g and 0.7g, and the stirring speed is adjusted to 380rpm, other operations are the same as embodiment 1.

Embodiment 3

[0053] Example 3: 380 g of cyclohexane was added to a 1 L five-neck round bottom flask equipped with a stirrer, a reflux condenser, a dropping funnel, a thermometer and a nitrogen inlet tube. 0.7 g of triglycerol monostearate and 0.7 g of sorbitan stearate were added thereto, the temperature was raised to 50° C., and the mixture was uniformly dispersed at a stirring speed of 320 rpm.

[0054] 130 g of 75 wt% aqueous acrylic acid was added to a 500 ml Erlenmeyer flask. 130.2 g of a 32 wt% sodium hydroxide aqueous solution was added dropwise to the Erlenmeyer flask. Then, 0.45 g of potassium persulfate, 0.015 g of propylene glycol diglycidyl ether, and 0.1 g of hydroxyethyl cellulose were added thereto to obtain an aqueous solution of acrylic acid monomer.

[0055] The aqueous solution of acrylic acid monomer was added into the above-mentioned five-neck round bottom flask, and nitrogen gas was passed in for 30-60 minutes while stirring. Then the temperature of the water bath ...

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Abstract

The invention relates to a method for preparing super absorbent resin by inverse suspension polymerization. With a hydrophobic and lipophilic organic substance as the solvent and a proper compound as the dispersant, the method subjects part of a neutralized acrylic acid solution to an inverse suspension polymerization reaction in the presence of a thickening agent, a cross-linking agent as well as a water-soluble initiator, and then employs a surface cross-linking agent for surface cross-linking treatment. The super absorbent resin prepared by the method of the invention has an average particle size of 100-200 micrometers, a saline water adsorption rate of over 45g / g in 1min, and an imbibition speed of less than 20s.

Description

technical field [0001] The present invention relates to a method for preparing a superabsorbent resin by a reverse-phase suspension polymerization method, and more particularly, to a method for preparing a superabsorbent resin with a fast liquid absorption speed. Background technique [0002] Superabsorbent resin is a water-swellable polymer with hydrophilic groups such as carboxyl groups and a certain degree of crosslinking, which can absorb water hundreds to thousands of times its own weight. In recent years, superabsorbent resins have been widely used in various fields such as sanitary materials such as diapers, agricultural, forestry and gardening soil improvement materials such as water-retaining agents, water-blocking materials for cables, anti-condensation materials, and medical materials. [0003] The preparation methods of superabsorbent resin mainly include solution polymerization method and reverse phase suspension polymerization method. The manufacturing process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/06C08F2/32C08J7/12C08J3/24
Inventor 马国林刘健
Owner 浙江卫星新材料科技有限公司
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