以高密度聚乙烯(HDPE)为基体,通过煅烧、酸化、硅烷偶联剂(KH550、KH590、Si69)对硅藻土(DM)进行改性,以改性硅藻土为填料,采用熔融法制备了DM/HDPE复合材料。通过扫描电子显微镜、傅里叶变换红外光谱仪、热重分析仪以及电子万能试验机等观察复合材的微观形貌及相容性,研究了DM用量、硅烷偶联剂用量及种类对复合材料力学性能和热稳定性的影响。结果表明:在KH590用量为1份、DM用量为2份条件下,制备的KH590-DM/HDPE复合材料拉伸强度提高28.05MPa,冲击强度提高126.05kJ/m2,并且热分解温度提高28℃;将KH590-DM加入HDPE,能够明显提高复合材料的力学性能和热性能。
The modified diatomite/high-density polyethylene (HDPE) composites were prepared by melting with HDPE as matrix,the diatomite (DM) was modified with calcination,acidification and silane coupling agents (KH550,KH590,Si69).Scanning electron microscope,fourier infrared spectrometer,thermogravimeter and electronic universal testing machine were used to be observe the microstructure and compatibility of modified-diatomite (m-DM)/HDPE composites,and studied the effect of the m-DM and silane coupling agents content on the mechanical and thermal properties of the composites.The results showed that the tensile strength of KH590-DM/HDPE composites increased by 28.05MPa,the impact strength increased by 126.05kJ/m2,and the thermal decomposition temperature increased by 28℃ when 1phr KH590 and 2phr DM,with the addition of KH590-DM,the mechanical and thermal properties were significantly improved.
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