By adding an appropriate amount of nano-SiO2 powder to PE for modification,a PE/nano-SiO2 composite with good mechanical properties,temperature resistance and UV resistance was prepared.The effect of filled nano-SiO2 content on PE properties was studied,and when the content of nano-SiO2 was added to 1.5％,the reinforcement and toughening effect of the composite was the best,and compared with pure PE,the impact strength of simple support beams was increased by 6.6％,the flexural strength was increased by 15％,and the tensile strength was increased by 12.6％.The fixed tensile strength(100％)of the composite material at 110 ℃ was increased by 14％compared with pure PE,the load deformation temperature was increased by 3 ℃,and the temperature resistance was better.The OIT of the composite material at 200 ℃ after irradiation with ultraviolet lamp was 70.3 min,which was 21.7 min higher than that of pure PE after UV lamp irradiation,indicating that PE/modified nano-SiO2 composite had good UV resistance and could prolong the service life of the material.When the content of nano-SiO2 was added to 2％,the reinforcement and toughening effect of the composite begins to weaken.
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