Method for preparing kaolin complex high hydroscopic resin through light polymerization method

A technology of superabsorbent resin and composite resin, which is applied in the field of preparation of kaolin composite superabsorbent resin by photopolymerization method, to achieve the effects of reduced investment, fast reaction rate and simple preparation method

Inactive Publication Date: 2008-10-22
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some literatures have reported the synthesis of superabsorbent resins induced by ultraviolet light, none of the prepared superabsorbent resins has added kaolin, and the direct synthesis of kaolin-acrylic acid-acrylamide superabsorbent composite resins by UV light irradiation has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] React 30% acrylic acid with 20% NaOH solution in an ice bath for 0.3-2 hours, so that the neutralized acrylic acid accounts for 75% of the added acrylic acid. Then add 20% acrylamide and 0.05% N,N-methylenebisacrylamide to the above system, stir evenly in the round bottom flask, finally add 8% kaolin, stir evenly for 24 hours to form a stable suspension liquid. In addition, 0.05% photoinitiator 1173 was dissolved in absolute ethanol and added to the above suspension, stirred evenly for 2 to 3 hours, then poured into the photopolymerization reactor, covered with a layer of polyester film, and heated by 500W high pressure The mercury lamp is an ultraviolet light source, and the photopolymerization takes 20 to 30 minutes. After the reaction is completed, filter the synthesized kaolin composite superabsorbent resin, quickly wash it with methanol, dry it at 70-110°C, and pulverize it to obtain a white granular or gel-like kaolin composite superabsorbent resin with a gel rat...

Embodiment 2

[0028]In an ice bath, react 40% acrylic acid aqueous solution with 20% NaOH aqueous solution for 0.3-2 hours, so that the neutralized acrylic acid accounts for 70% of the added acrylic acid, and then add 20% acrylamide and 0.05% N to the above system, N-methylenebisacrylamide was stirred evenly in a round-bottomed flask, and finally 10% kaolin was added and stirred evenly for 24 hours to form a stable suspension. In addition, 0.08% of Michler's ketone and benzophenone (the molar ratio of Michler's ketone and benzophenone is 1.5:1) were dissolved in absolute ethanol and added to the above suspension, and after uniform stirring for 2 to 3 hours, Pour it into a photopolymerization reactor, cover it with a layer of polyester film, use a 500W high-pressure mercury lamp as an ultraviolet light source, and conduct photopolymerization for 30 to 60 minutes. After the reaction is completed, filter the synthesized kaolin composite superabsorbent resin, quickly wash with methanol, dry at ...

Embodiment 3

[0030] React 50% acrylic acid aqueous solution with 20% NaOH aqueous solution in an ice bath for 0.3-2 hours, so that the neutralized acrylic acid accounts for 65% of the added acrylic acid, and then add 20% acrylamide and 0.05% N to the above system, N-methylenebisacrylamide was stirred evenly in a round-bottomed flask, and finally 12% kaolin was added and stirred evenly for 24 hours to form a stable suspension. In addition, dissolve 0.06% of Michler's ketone in absolute ethanol and add it to the above suspension, stir it evenly for 2-3 hours, pour it into the photopolymerization reactor, and cover it with a layer of polyester film, and use 500W high-pressure mercury The lamp is an ultraviolet light source, and the photopolymerization takes 30 to 60 minutes. After the reaction is completed, filter the synthesized kaolin composite superabsorbent resin, quickly wash with methanol, dry at 70-110°C, and pulverize to obtain light yellow granular or gel-like kaolin composite supera...

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Abstract

The invention relates to a method for making a kaoline composite super absorbent resin by adopting the room temperature light polymerization method. The method for making the kaoline composite super absorbent resin comprises the following steps that: 2-hydroxide radical-methyl phenyl propane-1-ketone or Michler ketone and benzophenone are taken as evocating agents; N, N-methylene diacrylamide is taken as a cross-linking agent; ethanol and deionized water are taken as a solvent; a small amount of kaoline is added inside the acrylic acid and acrylamide light polymerization reaction system to form a suspended substance and is coated with a layer of polyester film; and the room temperature in situ light polymerization is performed to synthesize the kaoline composite super absorbent resin. Compared with the conventional industrial water solution polymerization method, the method has the advantages that the reaction speed is high, the heating or N2 gas is not needed and the cost is low. The kaoline composite super absorbent resin is white or light yellow gel solid or particle solid, has high gel intensity, the gel rate higher than 90 percent, the water absorbing capacity up to 485 times, the salt absorbing capacity up to 137 times, high water retention property, and the pH value less than or equal to 7, and can be directly used in the agriculture and forestry, etc.

Description

1. Technical field [0001] The present invention relates to a preparation method of photopolymerized kaolin composite superabsorbent resin, which uses 2-hydroxy-methylphenylpropane-1-ketone or benzophenone, Michler's ketone and derivatives thereof as photoinitiators, N, N-methylenebisacrylamide is used as a crosslinking agent, a small amount of kaolin is added to the photopolymerization reaction system of acrylic acid and acrylamide to form a stable suspension, and then covered with a layer of polyester film, and synthesized by in-situ photopolymerization at room temperature Kaolin - superabsorbent composite resin. Compared with the original method, the present invention has the advantages of fast reaction rate, no need of heating, no need of passing N2 gas, and lower cost. The kaolin composite superabsorbent resin prepared by the present invention is light yellow gel solid or granular solid, has strong gel strength, its water absorption rate and salt absorption rate can reach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/56C08F2/44C08F2/50C08L33/02C08K3/34
Inventor 万涛王笑青马小玲姚杰
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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