以胍胶为原料,溴代十二烷（C12H25Br）为醚化剂,在碱的催化作用下通过悬浮聚合制备出疏水改性胍胶,并制备了改性胍胶的水溶液及冻胶。通过红外、X射线衍射（XRD）、热重（TGA）测试对改性胍胶结构与性能进行了研究。测定了溶液表观黏度,并对冻胶耐剪切、耐温性能及粘弹性进行了研究。红外和XRD分析表明,疏水长链被成功引入胍胶,TGA分析表明,疏水改性可以提高胍胶的热稳定性。相同浓度的改性胍胶溶液的稳定性及黏度较胍胶溶液的高。测试表明,溶液在不同温度下的剪切黏度及冻胶的粘弹性模量、耐温能力等改性胍胶均优于胍胶。改性胍胶作为压裂液的稠化剂可以降低其使用浓度。
The modified guar gum was synthesized with guar gum as material and bromododecane as etherifying agent by suspension polymerization method.The solution and gel of the modified guar gum were also prepared.The structure and the property of the modified guar gum were analysized by Fourier transform infrared spectrum（FT-IR）,X-ray diffraction（XRD） and thermogravimetric analysis（TGA）.The heat resistance and the viscoelasticity modulus of the gel were also researched by rheometer.The results of FT-IR and XRD show that the hydrophobic long chain has been introduced into the guar gum successfully.TGA indicates that the modified guar gum has higher thermal stability.The rheology tests reflect that with different temperature conditions,the shear viscosity,the viscoelasticity modulus of the gel and the heat resistance of the modified guar gum are both better than that of the unmodified.The modified guar gum can be used as thickener of fracturing fluid,and it can reduce its amount.
参考文献
| [1] | 宫瑞英,吴文辉,史学峰.疏水改性羟丙基胍胶的制备及性能[J].高分子材料科学与工程,2009(06):132-134. |
| [2] | Yamamoto H.;Hashidzume A.;Morishima Y.;Tomatsu I. .Associative properties in water of copolymers of sodium 2-(acrylamido)-2-methylpropanesulfonate and methacrylamides substituted with alkyl groups of varying lengths[J].Macromolecules,2000(21):7852-7861. |
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