Study On Polymerization And Capability Of Poly Sodium Acrylate-clay Nanocomposites

There is abundant high quality coal series kaolin in the coal bed of Erdos , Wuhai and other places in Inner Mongolia. The low utilization of coal series kaolin causes serious waste and environmental pollution. Mengxi laterite mine is located in Balagong, Hangjinqi of Inner Mongolia. Mengxi laterite mine with stable mineration, thick deposition and high quality is an unusual large open-air mine all over the world. At present, there is no any reports about the development and research of Mengxi laterite mine. In this paper, the two kinds of nanocomposites were respectively polymerized with two kinds of clay and partly neutralized acrylic acid. In this way, not only the utilization of these two kinds of clay is expanded, but also the capability of water absorbency and salt absorbency of this material is increased.Two kinds of clay were treated with the different methods at first. The potassium acetate was used to intercalate coal series kaolin of Heidaigou by dry method. XRD and infrared spectra showed that kaolin had been intercalated by potassium acetate. Calculating from the formula for Bragg, we got the fact that the basal spacing of kaolin increased from 0.71nm to 1.15nm, the rate of intercalation was 42.3%. Mengxi laterite was purified twice at first. XRD patterns showed that a lot of quartz sand had been taken off effectively. Then Mengxi laterite had been modified by CTAB. XRD and infrared spectra showed that CTAB had been grafted on the surface of Mengxi laterite.PAA-coal series kaolin intercalation composites were synthesized by the method of solution polymerization. The influences of the kaolin powder quantity, cross-linker quantity, initiator quantity, neutralization degree and monomer quantity on the water absorbency and salt absorbency of composites were discussed through the measure of single factor experiment. The best approach of polymerization was obtained by orthogonal experiment. The water absorbency and salt absorbency of the product at best react condition was 1758g/g and 119.3g/g respectively. The water-absorbency velocity, the water holding capability, the intensity of gel and the influence of temperature were also detected. Contrastive experiments showed that coal series kaolin which had been intercalated can increase the water absorbency and salt absorbency of the superabsorbent resin.PAA- Mengxi laterite composites were polymerized by the same method.The influences of the Mengxi laterite quantity, cross-linker quantity, initiator quantity, neutralization degree and monomer quantity on the capacity of the water absorbency and salt absorbency of composites were also discussed by single factor experiment. The best approach of polymerization was found through the method of orthogonal experiment The water absorbency and salt absorbency of the product at best react condition was 1362g/g and 113g/g respectively. The water-absorbency velocity, the water holding capability, the intensity of gel and the influence of temperature also had been detected. Contrastive experiments showed that organized Mengxi laterite also can increase the water absorbency and salt absorbency of the superabsorbent resin.PAA-coal series kaolin intercalation composites and PAA- Mengxi laterite composites were characterized by XRD, FT-IR and SEM. The results showed that coal series kaolin was peeled off by crylic acid. The flake of coal series kaolin was dispersed in the polymer. Mengxi laterite was also dispersed in polymer equably. The diameter of attapulgite which is in Mengxi laterite is below 100nm. So both PAA-coal series kaolin intercalation composites and PAA- Mengxi laterite composites are nanocomposites.