Study On The Preparation And Application Of Soil-superabsorbent

Soil-superabsorbents could absorb a large amount of water in which the absorbed water was hardly removable, they were widely used in many fields. In this paper, the soil-superabsorbents was proposed using starch, acrylonitrile and 2-acrylamido-2- methylpropanesulfonic acid (AMPS) and Mn[(H2P2O7)3]3- as initiator and crylic acid and N,N-methyleneacrylamide -as material and potassium persulfate as initiator. The structure , character and absorbent mechanism were also discussed.This paper reported the first successful attempt to graft compolymerize acrylonitrile and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) onto starch using Mn[(H2P2O7)3]3- as initiator. The graft polymer was determinated by infrared spectrum. The graft copolymerization in different reaction conditions was studied carefully. The optimal reaction condition corresponds to 5.0mole% AMPS in monomer, 1.5 for starch/monomer, a concentrate of 2×10-3mol/L for Mn[(H2P2O7)3]3- and a reaction temperature of 30.0℃; a reaction time of 60min or long.This paper also attempted to graft compolymerize crylic acid and N,N- methyleneacrylamide using potassium persulfate as initiator. The graft polymer also was determinated by infrared spectrum. Different reaction conditions was studied carefully which effected on the copolymerization, Based on the orthogonal experimental results, the best reaction condition was: w(crylic acid) was 5%, m(potassium persulfate):m(crylic acid) was 0.1:100, m(N,N-methyleneacrylamide):m(crylic acid) was 0.14:100,the neutralize of crylic acid was 75%,the temperature of reaction was 70℃,the time of reaction was three hours. The absorbency was 750gH2O per gram dry sample.To make soil-superabsorbent was the aim of this paper. Through the above two kinds of superabsorbent mixed at different proportion, the available soil-superabsorbent can be made. The effect factors of soil-superabsorbent were studied carefully, the good result was: the dry manner wan semis iron pan-vacuum,the proportion of two superabsorbent was 3:2, the size of soil-superabsorbent granule was 2mm, dry temperature was 75℃, the time of reaction was 5h.The effect of soil-superabsorbent to the growth of the mung bean, corn and wheat was studied. The results showed that: when the used superabsorbent at the range of 0.1%~0.3% in the soil, the living days and the height of plant of mung bean, corn and wheat increased when the used soil-superabsorbent increased. The living days and the height of plant still increased but the rate of the germination decreased when the used soil-superabsorbent was more than 0.3%.