Preparation and performance of flame retardant PA66 by low-fill P-Si-based synergistic system
Nylon 66(PA66),as a widely used engineering plastic,is highly favored for its excellent mechanical properties and processing performance.However,the flammability of PA66 limits its development in certain safety-demanding application fields.To address this issue,this study aims to improve the flame retardancy,mechanical properties,and thermal stability of PA66 by constructing a P-Si-based synergistic flame retardant system through melt-blending modification.By utilizeing the melt-blending method,PA66 composites was prepared,employing aluminum diethyl hypophosphite(ADP),aluminum hypophosphite(AHP)and nano-silica(SiO2)to build a multi-synergistic flame retardant system.A systematic study was conducted on the effects of ADP/AHP/SiO2 synergistic flame retardant system on the performance of PA66,and a comprehensive evaluation was made on the flame retar-dancy,mechanical properties,and thermal stability of the PA66 composites.The experimental results indicate that ADP/AHP/SiO2 synergistic flame retardant system significantly enhances the flame retardancy of PA66.When the total addition amount reaches 9 phr,the flame retardancy level of PA66 reaches V-0 grade,and the limiting oxygen index is as high as 34.3%.In addition,the tensile properties of PA66 have also been significantly improved,with tensile strength and modulus increasing by 27%and 36%,respectively.Thermogravimetric analysis shows that the thermal stability of PA66 has also been significantly improved.The intro-duction of the ADP/AHP/SiO2 synergistic flame retardant system not only significantly improves the flame retardancy of PA66 but also effectively improves its mechanical properties and thermal stability.The discovery of this system provides strong support for engineering application of PA66 and has important practical application value and market prospects.
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