摘要
用离心法测定高吸水性树脂 KH841在电解质溶液中的溶胀度时测定结果的相对相差小,离心转速由2000 r/min 变为4000 r/min 时对测定结果的影响不显著。用离心法测定了高吸水性树脂 KH841在 NH_4Cl,NH_4NO_3,KCl,KNO_3,(NH_4)_2SO_4,NH_4HCO_3,KH_2PO_4不同浓度的溶液中的溶胀度,对溶胀度与溶液离子强度之间的函数关系进行了模拟,对一价阳离子型电解质可用通式 Q=14.4+15.2S^(-(1/2))表示溶胀度 Q 与溶液离子强度 S 之间的函数关系。
This paper has studied the measuring precision and the effect of centrifugation spinning rate on measured values when using the centrifugaton method to measure the water retention capacity of high water absorbing synthetic resin KH841 in electrolyte solutions.With this methed,the water retention ca- pacities of resin KH841 in NH_4Cl,NH_4NO_3,KCl,KNO_3,(NH_4)_2SO_4,NH_4HCO_3 and KH_2PO_4 solutions of different concentrations are measured,and the relationship between the water retention capacity and ionic strength are studied.The results demonstrate:the centrifugation method can be used to measure the water retention capacity of resin KH841 in electrolyte solutions,the measuring precision is significant and the ef- fect of centrifugation spinning rate on the measurement can be neglected,for one-valence positive ion elec- trolytes,a general formula Q=14.4+15.2S^(-1/2)can be used to express the relationship between the water retention capacity Q and the ionic strength S.
关键词
高吸水性树脂
离心法
溶胀度
high water absorbing resin KH841
centrifugation method
water retention capacity
electrolyte
