With ethylenediamine(EDA),diethylenetriamine(DETA)and triethylenetetramine(TETA)as reaction centers,methanol as solvent and methyl acrylate(MA)as raw material,three different types of hyperbranched polyamide-amines[PAMAM(EDA/DETA/TETA)]were synthesized by Michael addi-tion and amidation.Three kinds of phosphonic acid terminated hyperbranched polyamide-amine scale in-hibitors[PAMAM(EDA/DETA/TETA)-H2PO3]were prepared by modifying 1-hydroxyethylidene-l,1-diphosphonic acid(HEDP),and their scale inhibition performance and mechanism were studied.The re-sults show that the scale inhibition rate of hyperbranched polyamide-amines did not reach the standard,and the modified phosphonate terminated hyperbranched polyamide-amines had excellent scale inhibition performance.When the dosage of PAMAM(EDA)-H2PO3 is 500 mg·L-1 at high salinity,the scale inhi-bition rates of CaSO4 and CaCO3 are 98.5％and 90.1％respectively.It is also found that this type of scale inhibitor has the advantages of high temperature resistance,wide pH application range and long du-ration.Combined with dispersion performance test and scale sample analysis,it is found that its scale in-hibition mechanism was mainly related to branched molecular structure,high dispersion of polymer and introduced functional groups.
NETL
NSTL
万方数据
