Thermal expansion microsphere with core-shell structure and preparation method thereof

The invention provides a thermal expansion microsphere with a core-shell structure and a preparation method thereof, the thermal expansion microsphere comprises a core and a shell layer, the core comprises a foaming agent, the shell layer comprises a thermoplastic polymer, and a preparation monomer of the thermoplastic polymer comprises a conjugated diene monomer; a thermoplastic polymer is selected as a shell layer material of the thermal expansion microsphere, and a preparation monomer of the thermoplastic polymer is limited to comprise a conjugated diene monomer, so that the obtained thermal expansion microsphere with the core-shell structure not only has lower initial expansion temperature and higher expansion degree, but also has excellent solvent resistance; the application field is wider. 本发明提供一种具有核壳结构的热膨胀微球及其制备方法，所述热膨胀微球包括核心和壳层，所述核心包括发泡剂，所述壳层包括热塑性聚合物，所述热塑性聚合物的制备单体包括共轭二烯烃单体；通过选择热塑性聚合物作为热膨胀微球的壳层材料，并限定所述热塑性聚合物的制备单体包括共轭二烯烃单体，使得到的所述具有核壳结构的热膨胀微球不仅具有较低的起始膨胀温度，较高的膨胀度，同时还具有优异的耐溶剂性，应用领域更加广泛。