Improving interface adhesion of magnetic particle modified EVA hot melt adhesive through introduction of a thermodynamically compatible component
In order to improve the compatibility of Fe3O4 particles with ethylene vinyl acetate copolymers (EVA) composite hot melt adhesives (HMAs), Fe3O4 magnetic particles were surface coated with polyvinyl acetate (PVAc). The PVAc-coated Fe3O4 modified EVA composite HMAs were characterized by SEM, DSC, XRD, optical contact angle measuring, infrared dichroism and parallel-plate rheometer measurements. The results showed that Fe3O4 particles were successfully coated by PVAc, leading to better dispersion of the particles in EVA composite HMAs. It was also found that the orientation structure, interfacial property and the flow properties of the modified HMAs were all changed, and the segment orientation degree and crystallinity of the modified EVA composite HMAs clearly increased with the increase of PVAc-coated Fe3O4 particles content. Importantly, the peel strength of the modified HMAs was further enhanced. For the modified HMAs with 15 phr (parts per hundred resins) of PVAc-coated Fe3O4 particles, the peel strength reached 6.6 kN m−1 and was increased by 247% compared with the unmodified HMAs.
危险品化学品经营许可证（带存储）