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通过Ⅰ型稳定交联剂(MBA)与Ⅱ型不稳定交联剂(PEGDA)复合使用,采用反相乳液聚合法制备一种不稳定交联微球。通过本体聚合法考察PEGDA的分解温度为60~65℃,并结合激光粒度仪研究Ⅱ型交联剂对微球粒径、膨胀性能的影响,SEM观察微球水化前后的形态。研究发现,适量的Ⅱ型交联剂与MBA复合使用能够减小微球的初始粒径;微球水化前后形态近似球形,初始粒径约为3μm,膨胀后颗粒间发生团聚作用;不稳定交联微球尺寸分布较宽,在常温下几乎不膨胀,60℃后Ⅱ型交联剂失效,微球膨胀速率加快,膨胀倍率优于单一交联微球,1.95×105mg/L矿化度地层水中,微球18 h内中值粒径(D0.5)从13.94μm增加到70.71μm。
An unstable cross-linked microsphere was prepared by inverse emulsion polymerization through the combination of type Ⅰ stable crosslinking agent (MBA) and type Ⅱ unstable crosslinking agent (PEGDA). The decomposition temperature of PEGDA was investigated by bulk polymerization method. The effect of type Ⅱ crosslinking agent on the particle size and swelling property of the microspheres was investigated by laser particle sizer. The morphologies of the microspheres before and after hydration were observed by SEM. It was found that the appropriate amount of type Ⅱ crosslinking agent can reduce the initial particle size of microspheres when it is used in combination with MBA. The morphology of the microspheres before and after hydration is nearly spherical with an initial particle size of about 3 μm. The microspheres agglomeration occurs after swelling. The cross-linked microspheres have a wide distribution and almost no swelling at room temperature. After 60 ℃, the cross-linking agent Ⅱ failed, the expansion rate of microspheres was faster and the expansion ratio was better than that of single cross-linked microspheres. The degree of salinity of 1.95 × 105mg / L In formation water, the median diameter (D0.5) of microspheres increased from 13.94μm to 70.71μm in 18 h.