Preparation And Properties Of Compound Super Absorbent Resin By Method Of Microwave Polymerization

Super absorbent resin is a rapidly developing functional polymer materials in recent years. It has a certain degree of crosslinking of polymers and contains strong hydrophilic groups in the structure, but does not dissolve in water and organic solvent. It can absorb its own weight of the number of hundreds even thousands of times the capacity of the water, and the outside pressure is not easy dehydration, so high absorbent resin has a broad application prospects in the field of health such as agriculture, forestry water, desert prevention and control. Compared with developed countries, China’s super absorbent resin production is relatively low, used in hygiene products and more than80percent in recent years, with the implementation of the attention and the western development strategy of China’s agro-ecological environment. The super absorbent resin demand is increasing year by year and its performance also have higher requirements to speed up the study of the super absorbent resin. It has great significance.This thesis obtain resource-rich mushroom bran and bentonite as raw material from Jilin Province. They were prepared by three low-cost super absorbent resin under microwave irradiation, and its synthesis process, water absorption, surface structure studies. Mushroom bran is obtained from developing edible fungus waste medium and the main components is crude fiber, used to prepare the super absorbent resin which provides a new way to mushroom bran from the re-use. Bentonite is an inorganic clay and a rich source to obtain super absorbent resin by microwave radiation synthesis. Bentonite is mainly used in the starch, cellulose compound, rarely used for clay organic-inorganic composite. This thesis study bentonite and super absorbent resin composite to ensure high performance under the premise reduce the cost of raw materials.Jilin Agricultural University provides fungi fungus waste mushroom bran and acrylic acid (AA) graft copolymer which synthesize super absorbent resin. And experiment investigated the amount of mushroom bran, AA neutralization degree, initiator dosage, cross linker dosage which effect the resin absorbency. Test results get optimum conditions of synthesis:the mushroom bran of the mass fraction of83.3%,initiator potassium persulfate (KPS) mass fraction of1.33%,the cross linker N-N’-methylene-bis-acrylamide (MBA) mass fraction of2%(the above is the quality of the relative monomer AA) and AA neutralization degree is75%, the microwave power is450W. Synthesized the mushroom bran/acrylamide-acrylic composite super absorbent resin absorbs distilled water rate of814g/g and saline rate of49g/g under the conditions.Bentonite (BT) obtained from the Gongzhuling Liu house and acrylic acid under microwave irradiation crosslinking copolymerization into the super absorbent resin. And experiment investigate BT dosage, AA neutralization degree, the amount of initiator and crosslinker, microwave power effects of the resin absorbency.Test results get the optimal synthesis conditions as follows:AA and BT mass ratio is8:1, AA neutralization degree is80%, mass fraction of initiator KPS is0.8%, the mass fraction of crosslinker MBA quality score is0.02%, microwave power is720W. The composite resin absorb distilled water rate is1312g/g and saline absorption ratio is320g/g. Resin has a faster rate of water absorption, water absorption swelling process in line with the first-order kinetics, and has good heat and water retention and centrifugal water retention properties, and preliminary study its adsorption properties of several fertilizer: the water absorbency of resin was significantly decreased in urea,NH4Cl,KH2PO4, KCl solution. The sequence of influence as follows:KH2PO4> KCl>NH4Cl>Urea; The sequence of adsorption capacity of fertilizer as follows:Urea> KCl> NH4C1> KH2PO4.FTIR, SEM analysis of the three resins at the same time indicates that a graft or crosslinking copolymerization is occur and the product is complex of mushroom bran or bentonite and organic monomer polymer. Analysis TG of mushroom bran/acrylamide-acrylic acid composite resin and bentonite/acrylic composite resin show that they have good thermal stability. Analysis of XRD and EDX the bentonite/acrylic composite resin show that the monomer polymer have be into the layered structure of bentonite, and bentonite was dispersed in the resin.