Synthesis And Properties Of New Water Soluble Copolymer Using The Method Of Inverse Emulsion Polymerization

The inverse emulsion polymerization is the important method of polymerization because it has the feature of high concentrated monomer solution, easy refrigerant and low viscosity media in process of polymerization. Moreover, the polymerization may occur at a high rate to yield a high molecular weight water-soluble product. So the research on the inverse emulsion polymerization for water soluble polymer was very popular, and received an important development, and it may be mostly method synthesis of water-soluble polymer in the future. We have successfully prepared a series of water-soluble copolymers by inverse emulsion polymerization in our lab.In this paper we select these monomers such as acrylamide(AM), potassium acrylate, sodium stryenesulfonate(SSS), Diallyldimethylammonium Chloride(DADMAC), methacryloxyethyl trimethyl ammonium chloride (DMC), N,N-dimethyl -N-methacryloyloxyethyl -N-(3-sulfopropyl) ammoniu-m (DMPS), and so on. The amphoteric monomer of DMPS was successfully synthesized by the reaction of 1,3-cyclopropanesultone and Dimethylaminoet-hyl methacrylate in our Lab. A various of water-soluble copolymers can be prepared by the copolymerization of AM with other monomers, for example, amphoteric copolymers, anionic copolymers and cationic copolymers. The experimental conditions were studied detailedly to obtained optimum reaction conditions, including of selecting proper organic solvent, temperature, the content of initiators, ratio and content of different monomers, the content of emulsifier.In order to select a proper organic solvent as consecutive phase in inverse emulsion polymerization, we have done a serious of contrastive experiment, and found cyclohexane as consecutive phase is more suitable than white oil, coal oil and solvent oil. Using cyclohexane as consecutive phase can easily to make more steady latex, less negative reaction and lower viscidity. At thesame time, we also found the V(consecutive phase)/V(water phase) perfectly keeps 2/3 to 1, the concentration of monomer retaining 25 % to 45 % will be perfect.In order to get high molecular weight water-soluble copolymers, we tried various redox initiator such as potassium persulfate(KPS) - N,N,N',N'-tetra-methyl ethylene diamine (TMEDA), KPS- dimethylaminoethyl methacrylate (DMAEMA), KPS-NaHSO3 -DMAEMA, KPS-TMEDA-DMAEMA and so on. The results show that the KPS-TMEDA and KPS-TMEDA-DMAEMA are more proper for getting high molecular weight water-soluble copolymers by inverse emulsion polymerization than other. In addition, these redox initiators can easily make polymerizing under room temperature.The structure of these copolymers were ascertained by IR and 1H-NMR and their compositions were determined by EA. The thermal stability of those copolymers was determined by TGA. These measured results showed that these copolymers have good thermal stability. At the same time, the solution properties were studied by viscosity method using Ubbelohde viscometer, rolling viscometer, and so on. The results indicated the amphoteric copolymer of poly(AM-co-DMPS) behaved obvious antipolyelectrolyte effect. Furthermore, this kinds of copolymers are good thickness even in high temperature. The viscosity of other kinds of copolymers, however, for example poly(AM-co-AAK) will have a great affected by high temperature and high salt concentration.The performance in drilling fluids and flocculation of these copolymers were also tested. After adding copolymers into basic mud, applied effect of the drilling fluids will have a great improvement. In addition, they also as a kind of excellent flocculants duo to their fast settle time and flocculation ability, especially two different kinds copolymer combined application. So this series of water-soluble copolymers have important studied worthiness and widely applied foreground.