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通过乳液聚合反应,在经γ-甲基丙烯酰氧基丙基三甲氧基硅烷(MPTMS)预处理的纳米CaCO3表面实现聚合物包覆,讨论了乳化剂用量、投料方式、CaCO3与单体投加比、乳液体系pH值等因素对聚合过程的影响。IR分析发现,产物经甲苯抽提后,CaCO3表面仍有聚合物存在,说明除物理吸附外,部分聚合物以化学键合方式包覆在CaCO3表面,形成复合粒子;接触角测定和沉降体积方法研究表明,较之未处理CaCO3,复合粒子表面极性和表面张力得到显著降低,在非极性溶剂中的润湿性有所提高。
The polymer coating was achieved on the surface of nano-CaCO3 pretreated by γ-methacryloxypropyltrimethoxysilane (MPTMS) by emulsion polymerization. The effects of dosage of emulsifier, feeding method, dosage of CaCO3 and monomer Gabi, the pH of the emulsion system and other factors on the polymerization process. IR analysis showed that after the product was extracted by toluene, there was still polymer on the surface of CaCO3, indicating that in addition to physical adsorption, part of the polymer was chemically bonded to the surface of CaCO3 to form composite particles; contact angle determination and sedimentation volume method The results show that the surface polarity and surface tension of the composite particles are significantly reduced compared with the untreated CaCO3 particles, and the wettability of the composite particles is improved in non-polar solvents.