Synthesis And Properties Of Ester Crosslinking Superabsorbent Composite

Superabsorbent composites are more and more widely used in the application oflife with the extension of its usage field, at the same time, the higher performancerequirements are needed. Currently, polyacrylic acid salt is used as the mainsuperabsorbent composite, howerever, its salt resistance is poor and fluid absorptionrate is low, so practical application of the composite are restricted. Therefore, saltresistance of superabsorbent composite is one of the major problems in recent years’research. Research on salt resistance of superabsorbent composite shows significantvalue, which will help the popularization application of superabsorbent composite inagriculture.In this paper, acrylic acid （AA） was choosed as the main raw material throughUV initiating polymerization to synthesize salt resistance superabsorbent composite.At the same time, liquid absorbency and heavy metal adsorption experiments of thesuperabsorbent composite were carried out, expected to synthesize the salt resistancesuperabsorbent composite for wide application in the field of agriculture, forestry andgardening, and use the composite for adsorption of heavy metals. This paper includesfour parts:1AA as raw material, using ethylene glycol dimethyl acrylate （EGDMA） ascrosslinking agent to synthesize superabsorbent composite PAANa-E （resin1）. Liquidabsorbency in deionized water and0.9%NaCl were2509g/g,170g/g respectivelyobtained under the optimum condition; Liquid absorbency rate was fast and showedhigh liquid absency between the pH of4¹1. Adsorption capacity of PAANa-E forCu²⁺、Pb²⁺、Cr³⁺、Co²⁺four metal ions were4.52mmol/g、1.4mmol/g、3.2mmol/g、2.55mmol/g, respectively.2AA as raw material, using three glycol dimethyl acrylate （TEGDMA） as thecrosslinking agent to synthesize PAANa-TE superabsorbent composite （resin2）.Liquid absency in deionized water and0.9%NaCl were3930g/g,219g/g,respectively obtained under the optimum condition; PAANa-TE resin showed goodliquid absency at temperature of20⁵0℃, pH4¹1. Adsorption capacity of resin2 for the four metal ions were4.52mmol/g、2.4mmol/g、5.3mmol/g、5.0mmol/g。3AA as raw material, using two methylacrylic acid glyceride （GDA） as thecrosslinking agent to synthesize PAANa-GDA superabsorbent composite （resin3）.Liquid absency in deionized water and0.9%NaCl were2291g/g,125g/g,respectively obtained under the optimum condition; PAANa-GDA resin showed goodliquid absency in the range of pH4¹1. Adsorption capacity of resin3for the fourmetal ions were4.57mmol/g、1.3mmol/g、5.6mmol/g、5.0mmolg。...