PPG改性共聚物的结构特点及对阻垢性能的影响

Effect of Structure Characteristics of Poly(propylene glycol)-modified Copolymer on Scale Inhibition Performance

采用溶液聚合法成功制备出聚(丙烯酸-对苯乙烯磺酸钠-丙二醇双酯)P(AA-SSS-PPGAZMA)共聚物,并对其结构进行了表征;然后将P(AA-SSS-PPGAZMA)用于工业冷却循环水阻垢,详细考察了聚丙二醇(PPG)相对分子质量、共聚单体配比、阻垢剂的添加量及溶液pH值对阻碳酸钙性能的影响;进一步考察了添加阻垢剂后,碳酸钙成垢晶体的变化情况。结果表明,P(AA-SSS-PPGAZMA)对钙垢具有良好的阻垢性能,且在PPG相对分子质量为800、单体配比m(PPGAZMA)∶m(AA)∶m(SSS)为1∶2∶1、阻垢剂用量为3.5 mg/L时,对碳酸钙的阻垢率达到95.12%;且P(AA-SSS-PPGAZMA)阻垢剂的加入,使碳酸钙晶体的晶型发生了变化,同时,可降低钙垢晶体的结晶度,最终实现阻垢的目的。

According to the structural design insight into a material,a poly(AA-co-SSS-co-PPGAZMA)copolymer was successfully synthesized by solution polymerization,and its structure were characterized by FTIR.The resultant poly(AA-co-SSS-co-PPGAZMA)copolymer was applied for the scale inhibition of industrial circulating cooling water.The effects of the molecular weight of poly(propylene glycol)(PPG),monomer ratio,dosage of scale inhibitor and pH value on the inhibition efficiency of CaCO 3 scale were studied intensively.Furthermore,the effect of scale inhibitor on the crystalline structure of CaCO 3 was investigated by XRD and FTIR.The results indicated that the poly(AA-co-SSS-co-PPGAZMA)copolymer exhibited a good inhibition effect on CaCO 3 scale,and it achieved a inhibition rate of 95.12%for the CaCO 3 scale at the PPG molecular weight of 800,the PPGAZMA/AA/SSS mass ratio of 1/2/1 and the scale inhibitor dosage of 3.5 mg/L.Moreover,The XRD and FTIR analyses indicated that the scale inhibitor could inhibit the growth of CaCO 3 crystals and reduce the crystallinity of CaCO 3 scale,and therefore reached the purpose of scale inhibition.