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Method of preparing crosslinking poly(sodium acrylate) and crosslinking carboxymethyl starch complex high water absorption resin

A technology of superabsorbent resin and cross-linked carboxymethyl, which is applied in the field of polymer composite materials, can solve the problems of not being able to obtain granular products, affecting product water absorption, and high production costs, and achieve low production costs, high water absorption, and The effect of fast water absorption

Inactive Publication Date: 2007-10-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cross-linked sodium polyacrylate superabsorbent resin is mainly produced by inverse emulsion polymerization. The product uses cyclohexane as a solvent, and the product is granular, with fast water absorption and high water absorption rate, but the production cost is high and the safety is poor.
However, granular products cannot be obtained by aqueous solution polymerization. If they are dried and pulverized, the resulting powdered products will have a high water absorption rate when fully stirred. Under normal water absorption conditions, it will seriously affect the water absorption of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The quality index of cross-linked sodium polyacrylate is: based on the mass of acrylic acid, N, N'-methylenebisacrylamide is 0.25%-0.60% of the mass of acrylic acid, potassium persulfate is 0.10%-0.30% of the mass of acrylic acid, propylene The amide is 1%-4% of the mass of the acrylic acid, the 2-acrylamide-2-methylpropanesulfonic acid is 1%-4% of the mass of the acrylic acid, and the pH is adjusted to 6-7 with sodium hydroxide.

[0017] The quality index of cross-linked carboxymethyl starch is: the degree of carboxymethyl substitution is 0.1-0.6, and the degree of cross-linking is 0.1-1.8 cross-linking groups per 100 glucose units;

[0018] The mass ratio of cross-linked sodium polyacrylate and cross-linked carboxymethyl starch is 80:20, fully mixed in a kneader;

[0019] Gelatinization: mix in a kneader, and gelatinize the starch, the gelatinization temperature is 80°C, and the time is 40min;

[0020] Tablet production: perform tablet production in a drum dryer at a...

Embodiment 2

[0024] The quality index of cross-linked sodium polyacrylate is: based on the mass of acrylic acid, N, N'-methylenebisacrylamide is 0.25%-0.60% of the mass of acrylic acid, potassium persulfate is 0.10%-0.30% of the mass of acrylic acid, propylene The amide is 1%-4% of the mass of the acrylic acid, the 2-acrylamide-2-methylpropanesulfonic acid is 1%-4% of the mass of the acrylic acid, and the pH is adjusted to between 6-7 with sodium hydroxide.

[0025] The quality index of cross-linked carboxymethyl starch is: the degree of carboxymethyl substitution is 0.1-0.6, and the degree of cross-linking is 0.1-1.8 cross-linking groups per 100 glucose units;

[0026] The mass ratio of cross-linked sodium polyacrylate and cross-linked carboxymethyl starch is 85: 15, fully mixed in a kneader;

[0027] Gelatinization: mix in a kneader, and gelatinize the starch, the gelatinization temperature is 100°C, and the time is 30min;

[0028] Tablet production: perform tablet production in a drum ...

Embodiment 3

[0032] The quality index of cross-linked sodium polyacrylate is: based on the mass of acrylic acid, N, N'-methylenebisacrylamide is 0.25%-0.60% of the mass of acrylic acid, potassium persulfate is 0.10%-0.30% of the mass of acrylic acid, propylene The amide is 1%-4% of the mass of the acrylic acid, and the 2-acrylamide-2-methylpropanesulfonic acid is 1%-4% of the mass of the acrylic acid; the pH is adjusted to between 6-7 with sodium hydroxide.

[0033] The quality index of cross-linked carboxymethyl starch: the degree of carboxymethyl substitution is 0.1-0.6, and the degree of cross-linking is 0.1-1.8 cross-linking groups per 100 glucose units;

[0034] The mass ratio of cross-linked sodium polyacrylate and cross-linked carboxymethyl starch is 90:10, fully mixed in a kneader;

[0035] Gelatinization: mix in a kneader, and gelatinize the starch, the gelatinization temperature is 120°C, and the time is 20min;

[0036] Tablet production: Tablet production is carried out in a dr...

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Abstract

The invention discloses a making method of crosslinking sodium polyacrylate and crosslinking carboxymethyl starch built high-adosrbing resin in the macromolecular composite material technical domain, which comprises the following steps: building crosslinking sodium polyacrylate and crosslinking carboxymethyl starch; blending; gelatinizing; tabletting; grinding; sieving; obtaining the product with low manufacturing cost and high safety; making the distilled water adsorbing rate by 800-1200 times and physiological saline adsorbing rate by 60-100 times.

Description

technical field [0001] The invention discloses a method for preparing a superabsorbent resin compounded with cross-linked sodium polyacrylate and cross-linked carboxymethyl starch, which belongs to the technical field of polymer composite materials. Background technique [0002] Superabsorbent resin refers to a polymer substance with particularly strong water absorption performance. Its water absorption capacity is dozens or even thousands of times its own mass, and its ability to absorb normal saline is generally several to dozens of times its own mass. Superabsorbent resins have been researched since around 1950 and put into industrial production around 1960. There are many types of superabsorbent resins, mainly including starch-based, cellulose-based, protein-based, chemically synthesized and various composite-based superabsorbent resins. [0003] The development and research of starch-based superabsorbent resin has a history of several decades. It was started by graftin...

Claims

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Application Information

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IPC IPC(8): C08L33/02C08L3/04C08J3/00
Inventor 童群义王丽
Owner JIANGNAN UNIV
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