Containing silicon type calcium carbonate scale inhibition agent SMAA study
A new silicon-containing polymer scale inhibitor SMAA was synthesized by free radical copoly-merization in aqueous solution,using sodium hypophosphate(SHP),acrylamide(MA),2-acrylamide-2-methyl-1-propanesulfonic acid(AMPS),trimethoxy(vinyl)silane(A171)as raw materials and 2,2'-azodi-isobutylamidine dihydrochloride(V50)as initiator.The structure was characterized by FTIR,1H NMR,GPC and XPS.The result showed that the optimal synthesis conditions were as follows:Monomer ration n(SHP)∶n(MA)∶n(AMPS)∶n(A171)=10∶30∶10∶1,initiator dosage 1.0％,reaction temperature 80 ℃,monomer concentration 25％,polymerization time 5 h.When the evaluation temperature is 70 ℃and the dosage is 50 mg/L,the anti-scale rate can reach 92.9％.SEM,XRD and TEM were used to study the mechanism of action of anti-scale agent SMAA on calcium carbonate.The anti-scale mechanism of an-ti-scale agent SMAA is to cause lattice distortion of calcium carbonate crystals,prevent the accumulation and increase of calcium carbonate crystals,and coat the formed calcium carbonate microcrystals.
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