Pyrolysis Kinetics Of Wood-plastic Composite Materials

Wood-plastic composite material is a new composite material ,which is composited from polymer matrix and Pretreatment of plant fiber or powder as filler, It is mainly use waste wood and thermoplastics as the main raw material, high-temperature mixing, and then obtained by the molding process and is the basis of modern industrial materials recycling the best scientific research applications in the industrial production,As a new wood-plastic composite materials and extensive use of green materials, its applications are broad, the main product is the gallery board, stairs, fence and a small amount of civilian consumer goods.Timber with a variety of high-polymer matrix composite of the complex system are as easy and common materials, combustion, and heat capacity, heavy smoke, which greatly limits the application of wood-plastic composite materials.Therefore, the degradation of wood-plastic composite materials, mechanisms and affecting factors not only conducive to long-term stability of the materials used, but also conducive to the future use of recycled materials and biodegradable materials on the design and use. This is not only of theoretical significance, more practical value.Thermal analysis technique application of composite materials and has an important role in recovery。Studying the thermal decomposition characteristics of composite materials is closely related to research in the fuel consumption of materials , Flame retardant commonly used in the study to determine the thermal stability, suggesting that fire-retardant mechanism of the composite materials more widely used.First, wood and plastic composites were prepared with PVC as matrix, and the thermal decomposition properties of PVC and its flame-retardant composites at different atmosphere and heating rate were analyzed by TG DTA and DTG. The activation energy of the composites were calculated by Freeman method and Distributed activation energy model (DAEM) and other kinetic study method. The mechanism of degradation about flame retardant system and composites were studied by the variation law of activation energy. Also, the kinetics of pyrolysis and the mechanism of degradation of composites were discussed. Second,wood and plastic composites were prepared with LDPE as matrix,and inorganic green flame retardant system were choosed to add into the composite meterials. In the study based on the TG curve, derived pyrolysis process according to its thermal decomposition products through the comparison of proton flow strength varies with temperature.Calculate activation energy variation with loss weight through diferent dynamic model,study the thermal decomposition mechanism of composite materials and the affects of flame retardants on pyrolysis process of composite materials.The result shows ,the wood fiber's carbonization has the role of carbon dose during the thermal decomposition of LDPE.Because of the flame retardants'thermal decomposition and carbonization,the activation energy of composite materials reduced after the metal hydroxide flame retardants were added.Third, wood and plastic composites were prepared with EVA as matrix, and intumescent flame retardant system were choosed to add into the composite meterials In the study based on the TG curve, derived pyrolysis process according to its thermal decomposition products through the comparison of proton flow strength varies with temperature.Calculate activation energy variation with loss weight through diferent dynamic model,study the thermal decomposition mechanism of composite materials and the affects of flame retardants on pyrolysis process of composite materials.The result shows ,intermolecular hydrogen bonds can be formed by vinylacetate in EVA and wood surface hydroxyl groups,and the overall activation energy of the composite materials reduced, because of the dilution gas source and carbon source as carbon composite of the intumescent flame retardant in the flame retardant composite materials...