Preparation Of Aa-hpa-amps And Scale Inhibition Performance

In the thesis,the synthesis and antiscale performance of the polymer AA-HPA-AMPS are studied,and more,the polymer AA-HPA-AMPS-AM is synthesized,its antiscale performance is seeing about.At last,to compare the antiscale performance between the products above.The water is as solvent,the ammonium persulfate is as initiator,monomers are 2-acrylanmide -2-methylpropanesulfonic acid,acrylic acid,hydroxypropyl acrylate,acrylamide. Then such two polymers are obtained as AA-HPA-AMPS and AA-HPA-AMPS-A M.The effect of the reaction temperature(65℃～95℃),monomer ratio,initiator dosage (account for the percent of monomer quality 4%～6%) and reaction time(1h～5h) on the scale inhibition are investigated.The optimum Synthesis conditions are built by the orthogonal experiment.The polymers are characterized by IR spectra and TG..The results of static scale inhibition experiments show that the performance of AA-HPA-AMPS and AA-HPA-AMPS-AM are good at inhibiting the deposition CaCO₃,Ca₃(PO₄)₂.When the concentration of Ca²⁺ is 6mmol/L,the concentration of HCO₃^- is 12mmol/L,the concentration of polymer is 3 mg/L,The CaCO₃ scale inhibition rate of the polymers AA-HPA-AMPS and AA-HPA-AMPS-AM are respectively 75.2%and 41.4%.When the concentration of Ca²⁺ is 250mg/L,the concentration of PO^3- is 5mg/L,the concentration of polymer is 5mg/L.The Ca₃(PO₄)₂ scale inhibitoion rate of the polymers AA-HPA-AMPS and AA-HPA-AMPS-AM are respectively 96.55%and 98.5%By SEM,the change of the shape of CaCO₃ and Ca₃(PO₄)₂ happens greatly since the polymer is acceded,and it shows that the polymer studied has good performance.