羧甲基黄原胶溶液流变减阻特性研究

Rheologcal and Drag Reduction Properties of Carboxymethyl Xanthan Gum Solution

蓝程程 卢拥军 邱晓惠 方波 王丽伟 张洪 翟文 刘玉婷

LAN Chengcheng LU Yongjun QIU Xiaohui FANG Bo WANG Liwei ZHANG Hong ZHAIWen LIU Yuting

为提高黄原胶（XG）的流变和减阻性能，用醚化剂（氯乙酸钠）对XG 进行改性制得羧甲基黄原胶（CMXG）。研究了CMXG的流变特性（剪切变稀性、黏弹性、触变性）、耐温耐剪切性和减阻性能。结果表明，与XG相比，CMXG的黏度显著增加，6 g/L CMXG溶液的黏度比XG增大了156%；CMXG溶液的弹性模量、黏性模量、触变性和耐温性能均显著提高。XG和CMXG溶液均具有剪切变稀性，黏度随剪切速率的变化曲线可用Cross 模型表征。CMXG溶液在光滑管中的减阻率随浓度和流量的增大而增大，1g/L CMXG溶液的最大减阻率为64.3%，减阻效果好于XG。图17 表2 参22

In order to improve the rheological and drag reduction properties of xanthan gum（XG），carboxymethyl xanthan gum（CMXG） was synthesized by XG and etherifying agent （sodium chloroacetate）. The rheological properties （shear thinning，viscoelasticity and thixotropy），temperature and shear resistance and drag reduction property of CMXG solution were studied. The results showed that the viscosity of CMXG increased significantly comparing with XG. The viscosity of 6 g/L CMXG solution was 1.56 times more than that of 6 g/L XG solution. The storage modulus，loss modulus，thixotropy and temperature resistance of CMXG solution were greater than those of XG solution. XG and CMXG solutions had shear thinning properties，and the change curve of viscosity with shear rate could be characterized by Cross model. The drag reduction rate of CMXG solution in smooth tube increased with increasing concentration and flow rate. The maximum drag reduction rate of 1 g/L CMXG solution reached 64.3%，and the drag reduction effect was better than that of XG.

10.19346/j.cnki.1000-4092.2018.01.009