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Method for synthesizing ternary-copolymerized super-absorbent resin

A technology of superabsorbent resin and synthesis method, which is applied in the field of superabsorbent resin, can solve the problems of increasing process cost, secondary pollution, and reducing product purity, and achieve the effects of reducing process cost, increasing reaction rate, and simplifying process

Inactive Publication Date: 2014-11-05
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 1) In the production process of starch-based water-absorbent materials, starch needs to be gelatinized first, which increases the process cost; and its polymerization technology requires the use of a large amount of organic solvents such as Tween 60, which is easy to cause secondary pollution
[0010] 2) Acrylic acid molecules contain C=C, which has high polymerization activity. During the polymerization process with chitosan, on the one hand, it is easier to cause degradation of chitosan than acetic acid; Formation of homogeneous acrylic acid, reducing the purity of the product

Method used

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  • Method for synthesizing ternary-copolymerized super-absorbent resin
  • Method for synthesizing ternary-copolymerized super-absorbent resin
  • Method for synthesizing ternary-copolymerized super-absorbent resin

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Chitosan hydrochloride 10g, itaconic acid 7g, stirred and dissolved in 80mL distilled water, after reaching 40°C, three kinds of initiators, ammonium persulfate-sodium bisulfite, ammonium persulfate and cerium ammonium nitrate were added respectively, and parallel Test, the concentration is 15%. Under nitrogen protection, 20 mL of acrylic acid cross-linking agent with a concentration of 15% was added through a dropping funnel, and reacted for 6 h. The yield of ammonium persulfate-sodium bisulfite was 87.6%, the yield of ammonium persulfate was 49.6%, and the yield of ammonium cerium nitrate was 9.6%.

Embodiment 2

[0036] Ammonium persulfate-sodium bisulfite is selected as the initiator, the preferred concentration range is 1%-18%, and other conditions are as in Example 1. The product yield increases gradually. When the concentration is 1-5%, there is almost no reaction between the monomers. When the concentration is 10%, the reaction yield is 55.3%. When the concentration is 15%, it reaches the maximum value of 87.6%. The concentration is At 18%, the yield did not change significantly.

Embodiment 3

[0038] The concentration of ammonium persulfate-sodium bisulfite is 15%, and other conditions are as in Example 1. The optimal reaction temperature is 30, 40, 50, 60, 70, 80°C. When the temperature is 30°C, it can be seen from the experimental phenomenon that it is in a translucent state, the polymerization efficiency is poor, and the yield of the product is also low, only 25.6%. When the temperature is 40°C, the yield reaches a maximum of 89.6%. The temperature continued to rise, and the yield decreased, reaching 44.3% at 80°C.

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Abstract

The invention discloses a method for synthesizing a ternary-copolymerized super-absorbent resin. The method comprises the following operating steps: weighing chitosan hydrochloride, itaconic acid and acrylic acid according to the mass ratio of (1-11): (2-10): (3-17); firstly, dissolving chitosan hydrochloride and itaconic acid, which are in the mass ratio, into distilled water, and transferring a mixed solution into a four-mouthed flask which is provided with a nitrogen gas conduit and a reflux condensation tube; heating to the temperature of 30-80 DEG C, then, adding a 1%-18% initiator, continuing to react for 1-6 hours under the protection of nitrogen gas, and dropwise adding acrylic acid which is in the mass ratio during reaction; mixing a reactant and ethanol, purifying and baking, thereby obtaining the ternary-copolymerized super-absorbent resin. According to the method disclosed by the invention, the process is simple, and the selected chitosan hydrochloride is a monomer, so that the problem of chitosan solubility is solved, and polymerization reaction can be carried out under neutral conditions; itaconic acid added during the synthesis of the product is a monomer, so that the water absorbency of the product is further improved, the highest absorption volume of deionized water is 1,000-1,100 times, the highest absorption volume of tap water is 300-400 times, and the highest absorption volume of normal saline is 100-120 times.

Description

technical field [0001] The invention belongs to the field of superabsorbent resins, in particular to a method for synthesizing ternary copolymerized superabsorbent resins. Background technique [0002] Polymer water-absorbing material is a typical functional polymer material, which can absorb hundreds or even thousands of times of its own weight in water, and has a strong water retention capacity. It has broad application prospects in daily chemical and food preservation. At present, the existing relevant water-absorbing materials mainly include the following types: [0003] 1) Starch absorbent material [0004] Conventional starch-based water-absorbing materials are polymerized by starch and petroleum-based monomers such as acrylonitrile and acrylamide under certain conditions, and are mostly produced by reaction suspension polymerization technology. The biocompatibility of the product is poor, the cost of the production process is high, and it is easy to cause secondary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/06C08F222/02
Inventor 刘娟
Owner QINGDAO UNIV OF SCI & TECH
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