Study On Preparation And Properties Of Nano-particles/upr Composite And BMC

Because of the peculiar properties in electricity, magnetism, light, sound, thermodynamics, catalysis, biology and so on, the preparation of nanno-composite has been one of the important methods to acquire high-performance composites. Silane coupling agent KH-570 and oleic acid, oleic acid and steric acid were applied to modify nano-Al₂O₃ and nano-ZnO in this paper, respectively. Modified nano-particles were added into UPR by high-energy ultrasonic in the form of powder or styrene suspention to prepare nano-particle/UPR composite with different contents of nano-particles. Hydrophobic index and IR were used to characterize effect of modification; The effect of curing agent content on moulding of nano-particles/UPR was studied by observing morphology of prepared composites with different contents of curing agent; The effect of nano particle's dispersion in UPR was characterized by TEM; Flexible strength of nano-particles/UPR was tested on powertest machine; Morphology of composites' bending fracture and distribution of nano-particles were observed by SEM; Initial curing temperature and maximum heat release of nan0-ZnO/UPR with different contents of nano-ZnO were analyzed by DSC experiment.Results indicated that KH-570 has a better effect of modification for nano-Al₂O₃ than oleic acid, while oleic acid has a better effect of modification for nano-ZnO than stearic acid; Suitable content of curing agent was necessary ,e.g. 1.5wt% of UPR was suitable in this paper, excessively high level of curing agent could cause severe reaction and lead to imploding; TEM showed shat styrene suspension of nano-particles was better for preparing nano-particles/UPR than nano powder because of its better effect of dispersion ; High-energy ultrasonic oscillation could enhance nano-particle's dispersion in UPR to a large extent ; Best flexible property was obtained with 3wt% of nanoparticles ; DSC analysis showed shat reactivity of nanoparticles/UPR was higher than UPR ; SEM concluded that distribution situation of nanoparticles in UPR was directly related to composite's properties, nanoparticles/UPR with appropriate content of nanoparticles had great strength and toughness .UPR is significant matrix of BMC, so preparation and properties of nano-ZnO/BMC were studied on the basis of nanoparticle/UPR in this paper. Nano-ZnO/BMC composite was prepared initially by adding nano-ZnO into UPR matrix according to BMC ingredient, and then nano-ZnO/BMC composite with higher content of ZnO was prepared when experimental technique was improved. Mechnical properties, Barcol Hardness and breakdown voltage testing indicated that nanoparticles/BMC with good comprehensive property could be prepared when suitable content of modified nanoparticles were added into BMC in the form of styrene suspention.