Inhibition Mechanism Of Aspartic-lysine Acid Copolymer

Currently, it has very prominent contradiction between supply and demand ofwater resources in our society,which has become an important issue constrainingsocio-economic development.Therefore, developed green water treatment agent to improve industrial waterutilization, reduced industrial water treatment piping and equipment fouling,thusprocessessignificant value for the rational use of water, conservation of waterresources and promoting sustainable economic and social development.As a novel water treatment agent, polyaspartic acid(PASP) exhibits excellentscale&corrosion inhibition performance. PASP has become one of research focusesbecause of its biodegradability in recent years. But under some conditions, the scaleeffect of PASP exists a little distance to that of some phosphorus containinginhibitors.Its application is limited greatly.In order to improve its performance;researchers abroad take the lead in modifying PASP. In this work, Lysine acid ischosen as co-polymeric monomer for the first time and the thermal condensationcopolymerization of L-aspartic acid (Asp) and Lysine acid (Lys) in solid phase isstudied. The study processes important theoretical and practical value for studying ofPASP and environmental friendly reagent.In order to ascertain the reaction system and to optimize the reaction condition,two aspects are investigated. They include the polysuccinimide derivative (PSID)yield, the scale inhibition performance of the copolymer (PAL). The optimal reactionconditions are given: the molar ratio of Asp to (Lys+Asp) being0.5, KH2PO4ascatalyst, the molar ratio of catalyst to reactant being0.08,16mL solvent, power being1200W and reaction time being10min. The inhibiting rate to CaCO3reachedbetter.the polysuccinimide derivative (PSID) yield was over90%. Scale inhibition ofcopolymer was superior to that of polyaspartic acid.The product’s structure is analysised using IR,1H NMR and13C NMR spectra.The structure is similar to that of PASP, representing the character of copolymer. Theproduct is proved as copolymer of aspartic acid and Lysine acid (PAL).The degradation percentages of PAL in10d and28d are respectively35%and80%, overstepping that of standard in OECD301B. PAL is a kind of biodegradablepolymers indubitably. Along with the Lys content rising, the biodegradability of PALincreases and the delitescence shorten. The influence of Cu2+is studied.Cu2+restrainsthe enzymatic activity, leading to the biodegradability of PAL decreasing. But therestrain function isn’t linear, but existing “low-dosage effect”. Comparing to PAA、ATMP、HEDP and PBTCA, the eximious biodegradability is because the existing ofC-N bone-structure and more-COO-. These special structures provide better bindingspot and existent surroundings for microbe.The dynamic of CaCO3crystallization are discussed with PAL inthe high salinitycircumstance. The influence of inhibitor concentration, inhibitorspecies, pH, theamount of crystal added, and temperature on dynamic isascertained. The results showthe PAL added makes rate constant ofcrystallization descend greatly.