| Summary: | 碩士 === 國立雲林科技大學 === 化學工程與材料工程系 === 106 === In this study,a two roller mills was used for physical blending,and base on halogen-free and non-toxic polyolefin materials EVA,LLDPE。Then,added to the layered double hydroxides and inorganic flame retardant form a low-smoke and flame retardant composites material.SEM,TEM and DSC were used to investigate the compatibility between flame retardant and matrix.TGA was used as thermal cracking of composite materials,Oxygen Index Tester (LOI) and UL-94 to assess the flame retardant effect.The results of the analysis are further explored for the flame retardant mechanism.Finally,we investigated changes of flame retardants on the mechanical properties of composites.
From the melting point temperature of DSC and the analysis of SEM microstructure, the compatibility between EVA and LLDPE of the substrate was determined first, and the composite material was prepared by adding flame retardant. The Tm point was shifted to the temperature range with the increase of flame retardant content. Move, there is no other Tm point generation. The SEM microstructure shows that the flame retardant powder is uniformly dispersed in the substrate without particle aggregation, and the composite material prepared above shows good compatibility. At the end of the TEM, it can be seen that the layered bimetal oxide has intercalation or delamination.
The mechanical properties of this study are based on the ASTM D638 test specification, achieving a tensile strength of at least 1.2 kgf/mm2' and an elongation of more than 200%. The smoke suppression index is tested according to the ASTM E662 test specification, and the smoke density is less than 75 for 4 minutes (Dm, 4min) and less than 150 for smoke density (Dm, 20min).
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