Preparation And Properties Of High Emissivity Ceramic Powder/PVDF Composites

With the increasing attention of infrared ceramic materials with high emissivity,accelerated development High emissivity infrared ceramic materials are of great significance.In this paper,high emissivity Fe₃O₄ and transition metal oxide ceramics are used as fillers,and PVDF with high specific heat capacity,high temperature resistance and easy processing is used as the resin matrix material.The flexible and high emissivity infrared composite material is prepared by hot press molding.These two types of flexible high emissivity infrared composite materials are the research objects,and their infrared properties are explored.The main results of this article are as follows:?1?Surface modification of Fe₃O₄ by using silane coupling agents KH-550,KH-560,KH-570,and comparison of the modification effects of the three coupling agents by contact angle test,select silane coupling agent KH-570 is used as a modifier of Fe₃O₄,and the optimal experimental conditions of silane coupling agent KH-570 modified Fe₃O₄ were determined by designing orthogonal experiments.Fourier infrared spectroscopy test results show that during the surface modification process,Fe₃O₄forms a chemical bond with the silane coupling agent KH-57.By characterizing the Fe₃O₄/PVDF composite material,the test results show that Fe₃O₄ is more evenly distributed in PVDF after the modified silane coupling agent KH570.And Fe₃O₄ doping reduces the thermal stability and crystallinity of PVDF to a certain extent,The infrared emissivity of the prepared composite film is greatly improved,and the emissivity is higher than 0.9,and the heat dissipation performance of the composite material is also improved by 12.6°C.?2?For the first time,this article uses Mn?NO₃?₂·6H₂O,Co?NO₃?₂·6H₂O,Fe?NO₃?₃·9H₂O and Cu Cl₂·3H₂O as raw materials for hydrothermal reaction to obtain transition metal oxide after sintering Ceramic powder.By characterizing the prepared transition metal oxide ceramic powder,the results show that the spherical particles with regular shape are successfully prepared,the surface of the grain is smooth,and the main crystal phase of the ceramic powder is Co Mn₂O₄ tip with high emissivity The spar has an emissivity of over 0.9.After modified by KH-570,the ceramic powder is changed from the original hydrophilicity to the lipophilicity.After composite film formation,Characterized by the transition metal oxide ceramic/PVDF composite film,the test results show that improves the thermal stability of PVDF and reduces The crystallinity of PVDF,The infrared emissivity of the prepared composite film is greatly improved,and the emissivity is above 0.9,and the heat dissipation performance of the composite material is also improved by 12.3°C.