空间稳定的硅氧烷改性丙烯酸酯聚合物乳液的制备研究

Study on preparation of steric stabilized siloxane hybrid acrylic polymer dispersion

以分子链一端为巯基的聚乙烯醇(PVA-SH)为保护胶体,合成了空间稳定的硅氧烷改性丙烯酸酯聚合物乳液。在微碱性乳液聚合条件下成功制备出异丙氧基硅烷质量分数高达11.2%的硅丙聚合物。在水解性能十分稳定的异丙氧基硅烷改性丙烯酸酯聚合物乳液的成膜过程中,可以通过调节pH值到微酸性,催化硅氧烷基团的水解反应,提高聚合物膜的交联速率和密度。PVA-SH稳定的异丙氧基硅烷改性P(MMA-BA)共聚物乳液能够经受24 000 r/min(约62 m/s)的高速剪切作用而保持粒径的稳定。

Steric stabilized siloxane hybrid acrylic polymer （SSPA） dispersion is prepared by surfactant-free emulsion polymerization with thiol end group polyvinyl alcohol （PVA-SH） as protective colloid. 11.2wt% of vinyl triisopropoxysilane （C- 1706） as hybrid into the MMA-BA backbone can be prepared under the alkalescence condition. The self-condensed reaction of high stable isopropoxysilane hybrid polymer can be catalyzed by acid. SSPA dispersion stabilized via PVA-SH has a very high shear stability, it can preserve particle size distribution even after spraying through anatomizer of 24 000 rpm（about 62 m/s）.