以动静态联合法对甲叉膦酸系阻垢缓蚀剂的阻垢作用进行了对比研究,通过分析计算提出了阻垢作用的动力学机制.由动态法给出的阻垢能力递变规律与静态法实验结果不尽相同,文中对此作了分析.
The scale inhibition effect of four methylenephosphonic acids with structure(HO)2OPCH2{N[CH2PO(OH)2]CH2CH2}n N[CH2PO(OH)2]2 (n=0,1,2,3,4)was compared by dynamic and static test methods.A dynamic mechanism of scale retarding effect was proposed based on analysis and calculation of the experimental data.The experimental results of dynamic method was different from those of static method in two aspects.First, according to dynamic tests the scale inhibition effect of the methylenephosphonic acides was not monotonously enhanced with the increase of their concentration,it may be weakened after a certain dosage.Second,their scale inhibition effect varied in the order:ATMP(m=3)＜EDTMP(m=4)＜TETHMP(m=6)＜DETPMP(m=5) from the dynamic tests rather than ATMP(m=3)＜EDTMP(m=4)＜DETPMP(m=5)＜TETHMP(m=6) from the static tests,here m referred to the number of CH2PO(OH)2group in a methylenephosphonic acid molecule.It was also found that the scale inhibition effect of the inhibitors was mainly due to the retarding of CaCO3 crystal growth rather than the reducing of the amount of calcium ions in solution.
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