Study On The Key Manufacture Technology Of Bamboo Plastic Composites

The output of bamboo ranks first all over the world in China, but they are still not sufficiently utilized. At the same time, the waste plastic is enormous. It’s great to develop the recycled bamboo plastic composite (BPC) with processing remains and waste plastic, which can relieve the short supply of wood and improve the ecological environment. At present, there is nearly no news reported about BPC at home and abroad. In this paper, three kinds of thickness (3mm、5mm、9mm) of BPC were prepared with bamboo powder (BP) and recycled high density polyethylene (HDPE) as raw materials by referring the manufacture technology of wood plastic composite (WPC) and wood based panel. The BP/HDPE weight ratio, modifier content, the hot pressing temperature and time were chosen to study the mechanical properties of composites and optimize the process parameters through orthogonal experiment. The bamboo powder and composites pretreated with KH550and MAPE were microscopically analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) and scanning calorimeter (DSC) to investigate the modifying effects and the interface bonding mechanism of composite. The main conclusions are as follows:(1) This method mainly includes two main processes referring to pelleting and hot pressing. It’s suit for BPC with high BP/HDPE weight ratio that can partly replace wood products and plastic.(2) BP/HDPE weight ratio is the most important factor to affect the physical and mechanical performance of BPC. After treated with KH550, The optimal process parameter was the BP/HDPE weight ratio7:3, modifier content4%, hot pressing temperature170℃and time8min for3mm BPC; the BP/HDPE weight ratio7:3, modifier content6%, hot pressing temperature190℃and time10min for5mm BPC; the BP/HDPE weight ratio7:3, modifier content4%, hot pressing temperature190℃and time12min for9mm BPC. (3) After treated with KH550and MAPE, the mechanical properties of9mm BPC are excellent, and all meet the first-class level of GB/T11718-2009"Medium Density Fiberboard". The modifier content is an important factor.(4) The hot pressing temperature is the main fact to determine the mechanical properties of composites. After treated with MAPE, The optimal process parameter was the BP/HDPE weight ratio7:3, modifier content6%, hot pressing temperature180℃and time10min for3mm BPC; the BP/HDPE weight ratio7:3, modifier content6%, hot pressing temperature180℃and time8min for5mm BPC; the BP/HDPE weight ratio7:3, modifier content6%, hot pressing temperature180℃and time12min for9mm BPC.(5) The modifier can reacted with cellulose in the amorphous region to enlarge the crystalline area. It helped to decrease the polarity of bamboo powder fiber and improve the interfacial compatibility and bonding strength between BP and HDPE.