Study On The Influence Factor Of Bamboo Charcoalfar Infrared Emissivity And The Performance Of Bamboo Charcoal-plasitc Composite

Bamboo charcoal is used as the main raw material in this paper to investigate its far-infrared emissivity which is conducted testsd by IR-2 dual-band infrared emissivity tester,and analyzed he influencing factors of far-infrared emissivity of different types of bamboo charcoal.The experiment focused on the change of far infrared emissivity of bamboo charcoal after the secondary treatment that contains radiant heating,microwave and carbonization.Besides,The crystallinity,specific surface area and element content of bamboo charcoal were then determined by powder X-ray diffractometer(XRD),Specific Surface Area and Porosity Analyzer,and Elemental Analyzer,respectively.The significance and correlation of factors affecting the far-infrared emissivity of bamboo charcoal were also explored and discussed.We optimized the process through Box-Behnken method(the response surface method)with three contributory factors(bamboo charcoal powder addition,particle size and panel density)that influence the far-infrared emissivity,flexural strength and formaldehyde adsorption of the charcoal-based polymer composite panel(PP/BC panel)prepared by hot pressing.all this is in order to provide theoretical and technical guidance for expanding the application field of bamboo charcoal far-infrared characteristics.The conclusions of this study could be summarized as follows:(1)The infrared absorption of bamboo charcoal presents a result that is in accordance with Wien's law.The infrared absorption peak at room temperature mainly falls in the range of 8~14?m,which is beneficial to the human body.The far-infrared emissivity of bamboo charcoal showed a trend of increasing first and then increasing with the increase of recarbonization temperature,moisture content and fixed carbon content.The far-infrared emissivity of the scattered bamboo charcoal is mostly better than that of the bamboo charcoal,which can be as high as 1.9%.(2)The bamboo charcoals treated by radiant heating,microwave heating and high temperature re-carbonization,separately,were also studied to determine its far-infrared emissivity.It turns out to be that the three different processes can effectively enhance the far-infrared emissivity of bamboo charcoals,And the re-carbonization treatment proves it with the most significant enhancement from 0.922 as-untreated to 0.950 as treated on the infrared emitting performance,increase by 3%.As the raise of re-carbonization temperature,the infrared emissivity increases after a relatively stable stage and keeps at a high value in the end of the test which presents a graph as high in the middle and low in the two ends.In this work it also found that the far-infrared emissivity of bamboo charcoal is positively correlated with its specific surface area and fixed carbon content which mostly contributes to its far-infrared emissivity,and negatively correlated with its average pore diameter.(3)Bamboo charcoal and polypropylene(PP)was selected for composite panels preparation.The flexural strength?far infrared emissivity and formaldehyde adsorption of the panels were tested to analyze the manufacturing process through the Box-Behnken method(the response surface method)with three contributory factors(bamboo charcoal powder addition,particle size and panel density).The results show that the optimal conditions for the preparation are:Pressure:8.0MP,pre-pressing time:5min,hot pressing time:10min,and pressing temperature:195?,and the most optimal parameters for preparing composite panels are:40%addition of bamboo charcoal powders,125?m,with a panel density of 0.8g/cm~3.The amount of bamboo charcoal powder added into the composites is most influential factor related to its properties,and then comes the panel density and particle size,respectively,The content of bamboo charcoal powder is negatively correlated with the flexural strength of PP/BC panels and positively correlated with the formaldehyde adsorption and the far-infrared emissivity.The PP/BC panel density is positively correlated with its flexural strength and negatively correlated with the formaldehyde adsorption and the far-infrared emissivity.