| In this paper, a novel cational water treatment agent, pyridine quaternary ammonium salt-type cationic polyacrylamidefCationic P(AM-co-VP),simplified as CPAV],which can be used as a muti-function wasterwater agent possessing flocculation, corrosion inhibition and sterilization function, has been synthesized.First of all, the synthesis of P(AM-co-VP) and CPAV and the kinetics of its copolymerization process were investigated.The copolymerization of 4-vinyl pyridine(4-VP) with acrylamide(AM) has been realized by radical copolymerization in solution using potassium persulfate as initiator, and the random copolymer P(AM-co-VP) of two monomers was obtained; By studying in detail the effects of cosolvent system, comonomer concentration, polymerization temperature, polymerization time and initiator amount on polymerization conversion and molecular weight, appropriate cosolvent system and optimum process conditions were confirmed; the monomer reactivity ratios of 4-VP and AM were obtained with Kelen-Tudos method, r4.vp =0.644, TAM =0.371; P(AM-co-VP) was quaternarized using dimethyl sulphate and two series of CPAV having pendant quaternary pyridinium group have been synthesized.The molecular structure and composition of P(AM-co-VP) and CPAV were fully characterized using many methods. The methods available were Fourier Transform Infrared spectroscopy(FTIR^ Nuclear Magnitic Resonance spectrometry NMR (1H-NMR and 13C-NMR) Ultraviolet spectrophotometry(UV) and Ubbelohde viscometer.Finally, flocculation and corrosion inhibition properties of CPAV were studied in more detail. The flocculation experiment of CPAV proceeded using siliceous earth solution as simulated industry wastewater; corrosion inhibition experiment of CPAV went on in sulfuric acid solution with method of loss of weight for AS sheet steel and corrosion inhibition degree was observed using Scanning Electron Microscope(SEM); by discussing the influence law of cationic degree and molecular weight of CPAV on the flocculation and corrosion inhibition property at length, the relationship between molecular structure and property of CPAV was investigated.The experimental result showed that CPAV had excellent flocculation and corrosion inhibition property. CPAV had good flocculation property because its cationic molecular chain possesses bridging adsorption and charge neutralization at the same time. Due to its pyridine ring and cationic polymer chain, CPAV could yield greater physisorption and chemisorption ,form a compact layer adsorption film on the mental surface and have a better effect on corrosion inhibition. |
