阳离子聚丙烯酰胺微球水溶液的剪切性及黏弹性能*
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国家自然科学基金项目“纳米微球缔合成胶的新型低伤害压裂液研制”(项目编号51504215),燕山大学青年教师自主研究计划 课题“缔合纳米微球压裂液体的研制”(项目编号 14LGB024),国家留学基金委“国家公派访问学者项目”(项目编号 201908130028)。


Shear and Viscoelastic Properties of Cationic Polyacrylamide Microsphere Aqueous Solution
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    摘要:

    为揭示阳离子单体和交联剂浓度对阳离子聚丙烯酰胺微球水溶液的剪切性及黏弹性的影响规律,以丙烯 酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)和N,N'-亚甲基双丙烯酰胺(MBA)等为原料,通过反相乳液 聚合法制备了阳离子度为2%~20%、交联度为0和阳离子度为10%、交联度为0.05%~0.2%的微球。采用高温 高压流变仪研究了聚合物微球溶液的耐温耐剪切性、剪切恢复性以及黏弹性。结果表明,聚合物微球溶液的耐 温耐剪切性优良,在80℃、170 s-1 的条件下剪切2 h的黏度仍能保持在150 mPa·s以上。增加阳离子度,微球溶液 抗剪切性和剪切恢复性增强,黏度保留率从30.79%增至68.56%;加入交联剂,微球溶液的稳定性增强,黏度保留 率高达85.38%,但微球溶液的整体黏度降低。在0.01~10 Hz频率扫描范围内,聚合物微球溶液的弹性模量始 终大于黏性模量,具有良好的弹性;且随着阳离子度增加,微球溶液的黏弹性模量呈增大趋势;随着交联度增加, 微球溶液的黏弹性模量先增大后减小。图8参13

    Abstract:

    In order to reveal the effect of cationic monomer and crosslinker concentration on the shear and viscoelasticity of cationic polyacrylamide microsphere aqueous solution,the microspheres with cationic degree of 2%—20%,crosslinking degree of 0,and cationic degree of 10%,crosslinking degree of 0.05%—0.2% were prepared by inverse emulsion polymerization,taking acrylamide (AM),methacryloyloxyethyl trimethyl ammonium chloride(DMC)and N,N'-methylene bisacrylamide(MBA)as raw materials. The high temperature and high pressure rheometer was used to test and evaluate the temperature and shear resistance,shear recovery and viscoelasticity of cationic polyacrylamide microsphere solution. The results showed that the viscosity of polymer microsphere solution could be maintained above 150 mPa·s after shearing for two hours at 80°C and 170 s-1,indicating excellent temperature and shear resistance. With increasing cationicity,the shear resistance and shear recovery of microsphere solution enhanced,and the retention of viscosity increased from 30.79% to 68.56%. When the crosslinking agent was added,the stability of microspheres solution enhanced,and the viscosity retention rate was as high as 85.38%,but the overall viscosity of microspheres solution decreased. In the frequency range of 0.01—10 Hz,the elastic modulus of polymer microsphere solution was always greater than the viscous modulus,showing good elasticity. And as the cationic degree increased,the viscoelastic modulus of microspheres solution tended to increase. With the increase of crosslinking degree,the viscoelastic modulus of microspheres solution increased first and then decreased.

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  • 在线发布日期: 2019-05-10
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