纳米填料改性环氧树脂建筑保温材料的制备及性能研究

Preparation and performance study of nano filler modifiedepoxy resin building insulation materials

环氧树脂基混凝土作为一种绿色环保的建筑材料,在道路修补和保温建筑中应用广泛。以环氧树脂E44为原料,二甲苯为稀释剂,纳米玻璃纤维为填料,制备了复合环氧树脂基混凝土,研究了不同纳米玻璃纤维长度对混凝土微观形貌、力学性能和保温性能的影响。结果表明,纳米玻璃纤维的掺杂发挥了“晶种”作用,促进了水化反应的进行,提高了环氧树脂基混凝土的密实度。纳米玻璃纤维长度的适当增加提高了混凝土与纤维的结合强度,当纳米玻璃纤维长度为8 mm时,混凝土的形貌最佳。随着纳米玻璃纤维长度的增加,混凝土的抗压强度和抗折强度先增大后降低。养护28 d,当纳米玻璃纤维长度为8 mm时,混凝土的抗压强度和抗折强度均达到最大值,分别为21.93和4.59 MPa。纳米玻璃纤维的掺杂改善了混凝土的孔结构,降低了导热系数,提高了保温性能,当纳米玻璃纤维长度为8 mm时,混凝土导热系数最低为0.147 W/(m·K),保温性能最佳。

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,promoted the hydration reaction,and improved the compactness of epoxy resin based concrete.The appropriate increase 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 fibers 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 doping 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.