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本文采用示差折光法和浊度滴定法研宄SPU(Ⅱ)对NaCl、MgCl_2、CaCl_2和SrCl_2的耐盐性。通过比较外加盐对含-SO_3~-或—COO~-的高分子的去水化作用,表明SPU(Ⅱ)的水化受盐如影响较小。SPU(Ⅱ)在盐浓度较高的溶液中仍有一定的溶解性。在pH=10的使用条件下,SPU(Ⅱ)在NaCl均饱和溶液中不沉淀析出。这些都是使SPU(Ⅱ)具有良好耐盐性的原因。
In this paper, salt tolerance of NaCl, MgCl_2, CaCl_2 and SrCl_2 was studied by differential refractometry and turbidimetric titration of SPU (Ⅱ). The hydration of SPU (Ⅱ) was less affected by salt than that of the addition of salt on the de-hydration of polymers containing -SO_3 ~ - or -COO ~ -. SPU (II) still has some solubility in solution with higher salt concentration. Under the condition of pH = 10, SPU (Ⅱ) did not precipitate in the saturated solution of NaCl. These are the reasons why SPU (II) has good salt tolerance.