摘要
用1-溴代辛烷使黄原胶XG侧链上的—COOM基团酯化，得到以100结构单元计取代度为11和21的水溶性疏水改性黄原胶HMXG-C8—11和-21。介绍了合成步骤，讨论了合成反应，考察了C8-11和C8—21的黏度特性。浓度〉0．75g／dL的c8—11水溶液．浓度〉0．60g／dL的C8—21水溶液，表观黏度（25℃，7．31／s）急剧增大，显示疏水缔合增黏效应，C8—21的增黏效应较强。0．20g／dLC8-11和C8．21水溶液的表观黏度，起初随外加NaC1浓度的增大而减小，NaCI浓度超过0．4g／dL后缓慢增大（（28．11）或较快增大（（28—21），出现盐增黏效应。温度从25℃上升到90℃时，0．20g／dL的XG、C8—11和C8—21水溶液表观黏度的降低幅度依次增大，在同-温度下的表观黏度值也依次增大。0，20g／dL的C8．21和C8-11水溶液，分别在外加SDBS浓度为〈0．01～0．08和0．01～0．15mmo1／L时出现表观黏度升高现象．反映疏水缔合聚合物与阴离子表面活性剂之间发生了相互作用。图6参8。
Through esterification of functionality -COOM on side chains of xanthan gum by 1-bromcoctane, water soluble hydrophobically modified xanthan gums of octyl substitution 11 and 21 per 100 structural units, HMXG-CS-11 and -21, are prepared. The procedure and reactions of synthesis are presented and discussed, the viscosity properties of their aqueous solution are investigated. The apparent viscosity （AV） at 25℃ and 7.3 1/s of aqueous solution increases dramatically at concentration of 128-11 〉0.75 g/dL and of 128-21 〉0.60 g/dL owing to viscosifying effect of hydrophobical association, which is more stronger for 128-21. With increasing NaCl concentration, the AV of 0.2 g/dL HM G-C8 aqueous solution decreases at first and increases slowly for 128-11 and more fast for 128-21 at NaCl concentration 〉0.4 g/dL owing to salt viscosifylng effect. At temperatures raising from 25℃ to 90℃, the AV depression of 0.20 g/dL HMXG-C8 aqueous solution changes in increasing order XG〈C8-11〈C8-21 meanwhile the AV values at every equal temparature changes in the same order. For 0.20 g/dL aqueous solution of C8-21 and 128-11, AV raise is observed at concentration of SDBS in range 〈0.01-0.08 and 0.01-0.15 mmol/L, showing interaction of hydrophobically associating polymer with anionic surfactant.
出处
《油田化学》
CAS
CSCD
北大核心
2007年第2期154-157,162,共5页
Oilfield Chemistry
关键词
疏水改性黄原胶
辛烷基取代黄原胶
制备
水溶液
黏度性能
增黏效应
采油用聚合物
hydrophobically modified xanthan
octyl substituted xanthan
preparation
aqueous solution
viscosity properties
viscosi fying effects
polymers for oil recovery
