Preparation and performance study of nano filler modified epoxy resin building insulation materials
Epoxy resin based concrete,as a green and environmentally friendly building material,is widely used in road repair and insulation construction.A composite epoxy resin based concrete was prepared using epoxy resin E44 as the raw material,xylene as the diluent,and nano glass fibers as the filler.The effects of different lengths of nano glass fibers on the microstructure,mechanical properties,and insulation performance of the concrete were studied.The results showed that the doping of nano glass fibers played a"seed crystal"role,pro-moted the hydration reaction,and improved the compactness of epoxy resin based concrete.The appropriate in-crease in the length of nano glass fibers improved the bonding strength between concrete and fibers.When the length of nano glass fibers was 8 mm,the morphology of concrete was optimal.As the length of nano glass fi-bers increased,the compressive strength and flexural strength of concrete first increased and then decreased.After 28 d of curing,when the length of the nanoglass fiber was 8 mm,the compressive strength and flexural strength of the concrete reached their maximum values,which were 21.93 and 4.59 MPa,respectively.The do-ping of nano glass fibers improved the pore structure of concrete,reduced thermal conductivity,and improved insulation performance.When the length of the nanoglass fiber was 8 mm,the minimum thermal conductivity of concrete was 0.147 W/(m·K),indicating the best insulation performance.
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