Synthesis and characterization of modified sodium carboxymethyl cellulose and polyethylene glycol ester new copolymer as scale inhibitor

A new scale inhibitor maleic anhydride-modified sodium carboxymethyl cellulose(CMCMA), acrylic acid (AA) and polyethylene glycol ester (PEGMA maleic anhydride-modified polyethylene glycol) were synthesized by aqueous solution free radical and evaluated as scale inhibitor against the growth of calcium carbonate(CaCO 3 ) scale through the static test experiments. When the reaction ratio is m(CMCMA):m(PEGMA):m(AA) = 1:3:5, the reaction condition is 80°C, the ratio of the initiator (ammonium persulfate) is 6%, the test temperature is 70°C, and the heat retention time is 8 h can get optimal scale inhibition results. The resistance rate of CaCO 3 scales up to 89%. The copolymer structure and CaCO 3 scale crystal were characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance ( 1 H-NMR) and scanning electron microscope. The performance of CaCO 3 scale crystallization and morphology data was found to be suitable for the conditions found in the cooling water system.