纳米SiO$_2$对聚合物FRSP-1乳液黏度特性影响

doi:10.11885/j.issn.1674-5086.2020.10.19.02

摘要/Abstract

摘要： 针对聚合物乳液抗盐性差，影响溶液黏度和其他性能问题，合成聚合物乳液FRSP-1，研究了聚合物乳液FRSP-1在水中的分散溶解性、溶解性、抗盐性、流变性以及纳米SiO$_2$对FRSP-1溶液的黏度特性、抗剪切性以及滤失性等影响。结果表明，FRSP-1乳液在水中分散性好，在20 s内FRSP-1乳液在水中的黏度可达到最大值90%以上；pH值对FRSP-1溶液黏度影响较大，当水溶液pH值在7~9，有助于得到高黏度的FRSP-1溶液；盐对FRSP-1溶液的黏度影响较大，其中二价盐较一价盐对FRSP-1溶液的黏度影响大且溶液的盐浓度越大，FRSP-1溶液的黏度越小，其影响程度由大到小的次序为CaCl$_2$>NaCl>KCl$\geqslant$NH$_4$Cl；在FRSP-1溶液中引入纳米SiO$_2$，对其抗盐性、抗剪切性、流变性和滤失性能实验表明，纳米SiO$_2$可以显著改善FRSP-1溶液的综合特性。按照1.0%FRSP-1+0.5%NH$_4$Cl+98.5%水+0.025%纳米SiO$_2$制备的溶液，在90 ℃、170 s$^{-1}$下连续剪切60 min后的黏度为46 mPa·s，其溶液在10 min时的滤失量为14.1 mL，这些特性与未加SiO$_2$空白样相比，FRSP-1溶液黏度提高了近40%，滤失量降低近45%，同时，FRSP-1溶液的触变性也得到了显著改善。

关键词: 聚合物乳液, 纳米颗粒, 二氧化硅, 黏度, 流变特性

Abstract: In view of the poor salt resistance of the polymer emulsion, which affects the viscosity and other performance problems of the solution, in this paper, the polymer emulsion FRSP—1 is synthesized, and the dispersion and solubility of FRSP—1 in water, salt resistance, rheological properties, and the influence of nano-SiO$_2$ on the temperature resistance, shear resistance and fluid loss of FRSP—1 solution are studied. The results show that FRSP—1 emulsion has good dispersibility in water, and the viscosity of FRSP—1 emulsion in water can reach more than 90% of the maximum value within 20 seconds; pH has a great influence on the viscosity of FRSP—1 aqueous solution. When the pH of the aqueous solution is between 7 and 9, it is helpful to obtain a high-viscosity FRSP—1 solution; salt has a greater influence on the viscosity of FRSP—1 solution. Divalent salt has a greater influence on the viscosity of FRSP—1 solution than monovalent salt. The greater the salt concentration of the solution, the smaller the viscosity of FRSP—1 solution, and the degree of influence is determined by the order of big to small is CaCl$_2$>NaCl>KCl$\geqslant$NH$_4$Cl; the salt resistance, shear resistance, rheology and fluid loss performance of FRSP—1 solution are significantly improved compared with that without nano SiO$_2$. According to the solution prepared by 1.0%FRSP—1+0.5%NH$_4$Cl+98.5% water+0.025% SiO$_2$, the viscosity after continuous shearing at 90 ℃ and 170 s$^{-1}$ for 60 min is 46 mPa·s, and the fluid loss at 10 min compared with no nano-SiO$_2$, the viscosity of FRSP—1 solution has increased by nearly 40%, and the fluid loss has been reduced by 45%. At the same time, the thixotropic properties of FRSP—1 solution has also been significantly improved.

Key words: polymer emulsion, nanoparticles, silica dioxide, viscosity, rheological properties

中图分类号:

TE357.12

王满学, 何静, 赵小平, 韦海龙. 纳米SiO$_2$对聚合物FRSP-1乳液黏度特性影响[J]. 西南石油大学学报(自然科学版), 2022, 44(2): 168-176.

WANG Manxue, HE Jing, ZHAO Xiaoping, WEI Hailong. Effect of Nano-silica on the Viscosity Characteristics of Polymer FRSP—1 Solution[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(2): 168-176.

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