Method for preparing high hydroscopicity resin by adding water-adsorbing resin for capturing polyvalent metal ion to unsaturated monomer water solution

A technology of multivalent metal ions and superabsorbent resins, applied in absorbent pads, medical science, bandages, etc., can solve problems such as unfavorable polymerization reactions and high total metal ions content, and achieve low metal ion content, high retention, and reduced The effect of the total content of metal ions

Active Publication Date: 2007-05-30
FORMOSA PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Another object of the present invention is to provide a method of adding a water-absorbent resin that captures polyvalent metal ions to an aqueous solution of unsaturated monomers to prepare a superabsorbent resin, so as to solve the problems in the production of superabsorbent resins disclosed in the prior art. The total content of metal ions in the required water-soluble unsaturated monomers is too high, which is unfavorable for the polymerization reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0059] step:

[0060] 1) Take 72.9g of 48% sodium hydroxide aqueous solution and slowly add 45g of acrylic acid and 97.2g of water into a 500cc conical flask, then add 45g of acrylamide dropwise into the above solution for 3 hours, and keep the temperature of the neutralization reaction system at 20 °C to 40 °C; at this time, a water-soluble unsaturated monomer concentration of 42wt% (weight percent) aqueous solution is obtained, wherein 69.5mol% (molar ratio) of acrylic acid or acrylamide is partially neutralized into sodium acrylate or sodium acrylamide.

[0061] 2) Add 0.138g of N,N'-methylenebisacrylamide in the water-soluble unsaturated monomer solution, and maintain the temperature at about 20°C.

[0062] 4) Add 0.048g hydrogen peroxide, 0.6g sodium bisulfite and 0.6g ammonium persulfate to start the reaction.

[0063] 5) Cutting the reacted superabsorbent resin with a cutting mill, and screening out the superabsorbent resin whose particle size is less than 2mm (millime...

reference example 2

[0066] step:

[0067] 1) Take 72.9g of 48% sodium hydroxide aqueous solution and slowly add 45g of acrylic acid and 97.2g of water into a 500cc conical flask, then add 45g of acrylamide dropwise into the above solution for 3 hours, and keep the temperature of the neutralization reaction system at 20 °C to 40 °C; at this time, an aqueous solution with a water-soluble unsaturated monomer concentration of 42 wt% is obtained, in which 69.5 mol% (molar ratio) of acrylic acid or acrylamide is partially neutralized into sodium acrylate or sodium acrylamide.

[0068] 2) Add 0.162g of polyethylene glycol diglycidyl ether in the water-soluble unsaturated monomer solution, and maintain the temperature at about 20°C.

[0069] 4) Add 0.048g hydrogen peroxide, 0.6g sodium bisulfite and 0.6g ammonium persulfate to start the reaction.

[0070] 5) Cutting the reacted superabsorbent resin with a cutting mill, and screening out the superabsorbent resin whose particle size is less than 2 mm in d...

reference example 3

[0073] step:

[0074] 1) Take 72.9g of 48% sodium hydroxide aqueous solution and slowly add 45g of acrylic acid and 97.2g of water into a 500cc conical flask, then add 45g of acrylamide dropwise into the above solution for 3 hours, and keep the temperature of the neutralization reaction system at 20 °C to 40 °C; at this time, an aqueous solution with a water-soluble unsaturated monomer concentration of 42 wt% is obtained, in which 69.5 mol% (molar ratio) of acrylic acid or acrylamide is partially neutralized into sodium acrylate or sodium acrylamide.

[0075] 2) Add 0.971g of propylene acrylate in the water-soluble unsaturated monomer solution, and keep the temperature at about 20°C.

[0076] 4) Add 0.048g hydrogen peroxide, 0.6g sodium bisulfite and 0.6g ammonium persulfate to start the reaction.

[0077] 5) Cutting the reacted superabsorbent resin with a cutting mill, and screening out the superabsorbent resin whose particle size is less than 2 mm in diameter.

[0078] 6) ...

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Abstract

The invention discloses a making method of high-hydroscopicity resin, which comprises the following steps: adding neutralizing agent and internal crosslinking agent in the insaturated monomer liquid; adding high-high-hydroscopicity resin to catch polyvalent metal ion; adding starter in the insaturated monomer solution; proceeding free-radical polymerization; cutting the gel; drying; grinding; sieving the fixed grain size; adding surface crosslinking agent; heating.

Description

technical field [0001] The present invention relates to a superabsorbent resin, in particular to a method for preparing the superabsorbent resin by adding a water-absorbent resin capable of capturing polyvalent metal ions to an unsaturated monomer aqueous solution. Background technique [0002] Superabsorbent resins are widely used as water retention agents in agriculture or gardening, anti-dew condensation agents in building materials, materials for removing moisture from petroleum, outer waterproof coating agents in cables, and hygienic products such as Diapers, feminine hygiene products, disposable wipes, etc. In the above-mentioned use cases, since the superabsorbent resin will directly contact with the human body, the safety of the superabsorbent resin becomes very important. Generally speaking, the physical properties required by superabsorbent resins include absorption rate, absorption power, absorption rate under pressure, low residual monomer content, and gel stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/06C08J3/24C08K5/109A61L15/24
Inventor 施凯耀陈忠毅吴政璋钟宏宗
Owner FORMOSA PLASTICS CORP
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