脲醛树脂包覆α-烯烃减阻聚合物微胶囊的制备与性能

摘要

On basis of reaction theory of urea and formaldehyde which were used as microcapsule shell materials, preparation technology of microcapsules containing α-olefin drag reducing polymer was studied by using in situ polymerization method with urea and formaldehyde as shell materials. Preparation, storage stability and dissolving property of microcapsules were studied by using particle analyzer, FT-IR, simultaneous thermal analyzer and simulation circular oil evaluation system of drag reducing rate and so on. The results show that, when microcapsules containing a-olefin drag reducing polymer are prepared by in situ polymerization of urea and formaldehyde in acidic conditions, the preparation technology has properties that reaction implements in mild conditions, polycondensation is easily held and the reaction accomplishes quickly. The particle size distribution of microcapsules containing α-olefin drag reducing polymer with poly (urea-formaldehyde) as shell material concentrates on 200fzm. Microcapsules can keep condition of smooth small balls for long time and have excellent ther-modynamic stability. The results of unti-static pressure storage stability and thermodynamic stability show that, microcapsules meet the qualifications of storage stability. Microcapsules containing α-olefin drag reducing polymer with poly (urea-formaldehyde) as shell material have excellent dissolving property in oil. The drag reducing rates of microcapsules containing α-olefin drag reducing polymer with poly (urea-formaldehyde) as shell material and uncoated α-olefin drag reducing polymer particles are similar. Though there is some time delay in drag reducing rate to microcapsules contrasted with uncoated particles, the peak value of drag reducing rate is equivalent, and meets the standard of practical in situ engineering application.%在阐述了尿素与甲醛聚合制备微胶囊壁材反应原理的基础上,以尿素与甲醛为壁材原料,运用原位聚合法研究了包覆α-烯烃减阻聚合物微胶囊的制备工艺,利用粒度分析仪、红外光谱仪、同步热分析仪和模拟环道油品减阻率评价系统等,对微胶囊制备、储存稳定和溶解性能进行了研究.结果表明:在酸性条件下,以尿素与甲醛为微胶囊化原料,采用原位聚合法制备包覆石油减阻聚合物颗粒的微胶囊,制备工艺具有反应温和、缩聚反应可控,可有效缩短反应时间等特点.制备的脲醛树脂包覆α-烯烃减阻聚合物微胶囊粒度分布主要集中在200μm处,微胶囊可长期保持较好的圆润小球状态,具有良好的热力学稳定性.静压耐压储存稳定性和热力学稳定性研究结果表明,微胶囊可完全满足储存稳定性的要求.脲醛树脂包覆α-烯烃减阻聚合物微胶囊在输送油品中具有优良的溶解性,与未包覆的减阻聚合物颗粒减阻率接近,微胶囊溶解后减阻率较未包覆时略有延迟,但减阻率峰值依然与未包覆时相当,可满足现场工程实际应用.