The Synthesis And Investigation Of Copolymer Scale Inhibitor With High Temperature Resistance

The increasing water consumption of industrial water and domestic water has resulted in a serious water resources situation and therefore the water treatment agent is developed. Scale inhibitor, due to its special ability of anti fouling and dispersing, has been widely used. With the increase of people’s environmental awareness and the introduction of environmental regulations, the requirements for water treatment agent are more stringent. The development of a new type of efficient and economic water treatment agent has become an urgent problem to be solved in the field of water treatment.In this work, maleic anhydride(MA), acrylic acid(AA), 2 acrylamide 2 methyl propyl sulfonic acid(AMPS) and sodium styrene sulfonate(SSS) were utilized as monomer, sodium hypophosphite and ammonium persulfate were selected as chain transfer agent and initiator, respectively, and the synthesis of the target product was achieved via free radical polymerization. Under static conditions, according to the national standard method, in copolymer on calcium carbonate inhibition performance as the index, the effects of the amount of monomer, initiator, chain transfer agent, and the reaction temperature, reaction time on the anti scaling performance of the synthetic product were investigated, respectively. The results demonstrated that the best performance was obtained under condition of the ternary copolymer for 2h in the polymerization, polymerization temperature of 80 ℃, AA, MA quality ratio of 2:1, content of AMPS for 20% of the total mass of AA and MA, causing agent and chain transfer agent dosage for 10% and 15% of the monomer, and the scale inhibition rate was 86.7%. Quadripolymer scale inhibitor in the polymerization temperature of 90 ℃, reaction time 3h, AA, MA quality than for 5:3 and content of AMPS for 20% of the total mass of the AA and MA, SSS and AMPS quality ratio of 1:6, causing agent and chain transfer agent dosage for 10% and 15% of the monomer, respectively, and the inhibition rate was 91.6%. Solid content of the terpolymer was 27.86%, and the recovery rate was 79.13%; while solid content and recovery rate of the quadripolymer was 31.02%, 78.66%, respectively.The scale inhibition performance of the two products were measured in the static simulation of high temperature aqueous solution(test temperature 70 ℃, test time 12h), and the results demonstrated that quadripolymer performance was better, and the optimal addition amount was 60mg/L; inhibition rate of more than 70% at test reaction time of 96 hours; the anti fouling rate was 71% when the calcium concentration reached 1250mg/L; the inhibition rate was still more than 80% under condition of 12 h, 85 ℃, which was much better than that of other scale inhibitors.Test results showed that the product had a good effect on the dispersion of iron oxide; preliminary study on the inhibition mechanism of the polymer for calcium carbonate was explored via the analysis of the changes of conductivity during the formation of calcium carbonate in solution as well as XRD and SEM characterization of the scale sample.