Study on Mechanical Properties and Heat Resistance Properties of Nano-SiO2 Reinforced HDPE Composites
The HDPE/nano-SiO2 composites were prepared using silane coupling agent(KH-570)to modify nano-SiO2 and mix nano-SiO2 with high-density polyethylene(HDPE).The mechanical properties and heat resistance of HDPE/nano-SiO2 composites were explored.The results showed that KH-570 was successfully grafted onto the surface of nano-SiO2.With the increase of nano-SiO2 content,the tensile strength,flexural strength and impact strength of HDPE/nano-SiO2 composites first increased and then decreased.When the nano-SiO2 content is 3%,the mechanical properties and heat resistance of HDPE/3%nano-SiO2 composites reach the best,and their tensile strength,bending strength and impact strength reach 39.6 MPa,32.5 MPa and 16.9 kJ/m2,respectively,which are 73.7%,59.3%and 36.3%higher than those of pure HDPE,respectively,and the initial thermal decomposition temperature of HDPE/3%nano-SiO2 composites is increased by 101℃compared with pure HDPE,the quality retention rate of HDPE/3%nano-SiO2 is 6.2%.
Nano-SiO2High density polyethyleneMechanical propertiesHeat resistance
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