端羧基超支化聚酯的合成及阻垢性能

Synthesis and Scale Inhibition Performance of Carboxyl-Terminated Hyperbranched Polyester

以三羟甲基丙烷为中心核,以2,2-二羟甲基丙酸为AB2单体,通过酯化反应得到二代端羟基超支化聚酯HBPE-2-OH,再以丁二酸酐对其端羟基进行改性,得到端羧基的超支化聚合物,并探讨了其作为阻垢剂阻硫酸钙垢时,聚合物用量、钙离子浓度、溶液pH、恒温温度对其阻垢性能的影响。结果表明,端羧基的超支化聚合物HBPE-2-COOH对CaSO4具有良好的阻垢性能,在阻垢剂的用量为20mg/L时,阻垢率达到98.31%;扫描电镜分析表明,HBPE-2-COOH抑制和破坏了硫酸钙垢晶体的生长和规整性。

The second generation of hydroxyl-terminated hyperbranched polyester(HBPE-2-OH)was prepared using trimethyloy propane(TMP)as core and 2,2-bis(hydroxymethyl)propionic acid as AB2 monomer.The OH-terminated hyperbranched polyester was modified with succinic anhydride to get COOH-terminated hyperbranched polyester.The effects of polyester dosage,Ca2+concentration,pH value and temperature of the system on inhibition efficiency were studied when COOH-terminated hyperbranched polyester was used as inhibitor of CaSO4 scale.The result indicate that HBPE-2-COOH acts as a good antiscaling inhibitor for CaSO4.When the polyester concentration is 20mg/L,its scale inhibition rate reaches 98.31%.The scanning electron microscope demonstrates that HBPE-2-COOH could inhibit growing of the crystal and then destroy crystallizing of CaSO4.