油酸酰胺丙基二甲基叔胺改性黄原胶溶液的流变特性

Rheological Properties of Oleamidopropyl Dimethylamine Modified Xanthan Gum Solution

蓝程程 方 波 卢拥军 邱晓惠 翟 文 王丽伟

LAN Chengcheng FANG Bo LU Yongjun QIU Xiaohui ZHAI Wen WANG Liwei

为改善黄原胶的流变性能，以油酸酰胺丙基二甲基叔胺与环氧氯丙烷为主要原料合成了长链疏水阳离子醚化试剂，并以此阳离子醚化试剂对黄原胶（XG）进行改性制得了长链疏水两性黄原胶（OD-XG）。研究并比较了 OD-XG和 XG溶液的流变特性，包括稳态黏度、流动曲线、触变性及黏弹性，并进一步研究了其耐温耐剪切性和破胶性能。研究结果表明，OD-XG 溶液的黏度较 XG 显著增加，质量分数为 0.6%的 OD-XG 溶液的黏度（237.97 mPa·s）比 XG溶液黏度（74.12 mPa·s）增大了 221%；XG和 OD-XG溶液的流动曲线可用非线性共转 Jefferys本构方程描述；OD-XG溶液的黏弹性及触变性较 XG溶液均显著提高；OD-XG溶液的耐温性能提高，80℃恒温剪切90 min后，质量分数0.4%的OD-XG溶液的保留黏度（70.10 mPa·s）约为XG溶液保留黏度（35.14 mPa·s）的2倍。破胶过程流变性研究结果表明，加入破胶剂过硫酸铵后OD-XG溶液的破胶情况良好。图19表2参28

In order to improve rheological properties of xanthan gum solutions，long-chain hydrophobic amphoteric xanthan gum（OD-XG）was synthesized by xanthan gum（XG）and hydrophobic cationic etherification reagent that was synthesized using the main raw materials of oleamidopropyl dimethylamine and epichlorohydrin. The rheological properties of OD-XG and XG solutions were studied and compared，including the steady viscosity，flow curve，thixotropy，and viscoelasticity，as well as the temperature resistance and the gel-breaking performance. The results showed that the viscosity of OD-XG solution was significantly higher than that of XG，and the viscosity of 0.6% OD-XG solution（237.97 mPa·s）was increased by 221% compared to the viscosity of 0.6% XG solution（74.12 mPa·s）. The flow curve of OD-XG and XG solution could be fitted by nonlinear co-rotation Jefferys model.The viscoelasticity and thixotropy of OD-XG solution were significantly higher than those of XG solution，and the temperature resistance of OD-XG solution was improved. The reserved viscosity of 0.4% OD-XG solution（70.102 mPa·s）was twice as much as that of 0.4% XG solution（35.135 mPa·s）. The rheological study of gel breaking process showed that，after adding the breaker the gel breaking was completed well.