改性纳米SiO_(2)/聚合物复合体系合成及性能

Synthesis and performance evaluation of modified nano-SiO_(2)/polymer composite system

以3-氨基丙基三乙氧基硅烷(APTES)和辛基三乙氧基硅烷(OTES)作为改性剂,修饰纳米SiO_(2)(NS)制备了两亲型改性纳米SiO_(2)(ANS),在此基础上,以丙烯酰胺、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为单体,制备了一种ANS/聚合物复合体系(ANPM)。两亲型纳米颗粒的引入,一方面利用颗粒与聚合物之间的静电、氢键等相互作用,提升聚合物的抗水解、抗主链断裂的性能;另一方面利用颗粒之间的疏水缔合作用,提升复合体系形成网络结构的能力。通过单因素实验,考察了AMPS用量、纳米颗粒种类、纳米颗粒用量对于产物增黏性能的影响,得到了最优的聚合条件。对比评价了现场驱油聚合物KYP-5和ANPM的抗剪切、抗盐、抗长期老化、驱油性能。结果表明,ANPM的采收率提高幅度为17.3%,显著高于KYP-5的10.7%,展现出良好的驱油效果。

Amphiphilic modified nano-SiO_(2)(ANS)was prepared from nano-SiO_(2)modified by 3-aminopropyltriethoxysilane(APTES)and octyltriethoxysilane(OTES).An ANS/polymer composite system(ANPM)was prepared using acrylamide and 2-acrylamido-2-methylpropanesulfonic acid as monomers.On the one hand,the electrostatic and hydrogen bond interactions between the particles and the polymer could improve the polymer′s resistance to hydrolysis and main-chain rupture,on the other hand,the hydrophobic association between particles could enhance the ability of the composite system to form a network structure.The effects of AMPS amount,nanoparticle type and nanoparticle amount on product properties were investigated through single factor experiments,and the optimal polymerization conditions were obtained.The anti-shear,anti-salt,anti-long-term aging and oil displacement performances of a contrast polymer KYP-5 and ANPM were comparatively evaluated.The results show that ANPM indicates a better oil-displacement property because the recovery rate of ANPM is increased by 17.3%,which is significantly greater than the 10.7%of KYP-5.