FLOCCULATING AND BIOCIDAL PROPERTIES OF COPOLYMER OF N,N-DIMETHYL-N,N-DIALLYL AMMONIUM CHLORIDE WITH N,N-DIMETHYLAMINOPROPYL METHACRYLAMIDE
Keywords:copolymerization, flocculant, water treatment, biocide, microbiological corrosion
Introduction. Nowadays, pollution of water reservoirs with harmful industrial waste is considered one of the urgent problems. Poly surfactants (flocculants) are usually used to clean industrial wastewater from harmful impurities. However, currently known flocculants do not meet the requirements for them. The main reason for this is the high cost of monomers or the complexity of flocculant synthesis methods. Microbiological corrosion (biocorrosion) of metal and reinforced concrete structures is still an unresolved issue. In this regard, synthesis of new effective flocculants with biocidal properties is considered one of the urgent problems. The purpose of this work is synthesis and studying of the flocculation and biocidal properties of the copolymer of N,N-dimethyl-N,N-diallylammonium chloride with N,N-dimethylaminopropyl methacrylamide (DMDAACh-DMAPMA). The methodology of the work is to synthesize a new effective poly-surfactant with flocculating and biocidal effect on the basis of industrial monomers available by the radical copolymerization method and to determine its properties by modern methods. Results and discussion. The effect of molar composition and the ionic strength of the medium on the flocculation and biocidal properties of the copolymer DMDAACh-DMAPMA was studied. It has been proven that copolymer DMDAACh-DMAPMA, synthesized from a mixture of monomers with molar composition 50:50 mol. %, shows the highest flocculation properties in relation to the dispersed particles of bentonite clay. The presence of salt (0.01 wt.% NaCl) in the media increases the flocculation properties of the copolymer. It was found that DMDAACh-DMAPMA copolymers have also biocidal properties and can be used as a biocidal compound to inhibit the growth of sulfate-reducing bacteria (SRB). The optimal concentration is 0.01÷0.05 mas. %.