The Key Technology Of Warm Compaction And Properties Of Toughening Wood/Plastic Composites

With the development of the green manufacturing technology special "twelfth five-year" planning ", the concept of green manufacturing is gradually understand and accepted by people, and as a sustainable development strategy existing in modern manufacturing.In order to use agriculture and forestry residues more quality and clean the author uses reed stem powder as base material, uses copper powder as the strength factor, uses polyethylene (PE) as the copper powder dispersion agent. Article prepared toughening wood-plastic composites by warm compaction forming. With the help of three-dimensional microscopy, scanning electron microscopy (SEM) and universal mechanical testing machine and other laboratory equipment, testing the material properties, optimizing the condition of warm compaction forming, and characterizing the structure and properties. Using non-linear finite element analysis software MSC.Marc to simulate warm compaction of the material forming process, in order to tap applications and a broader outlook of the new composites. The main contents and achievements are as follows:(1) Article select wide distribution and large output of reed stem as raw materials and use its powder as the base material. Study its chemical composition, size distribution, particle morphology and powder process performance after adding polyethylene. The results shows adding polyethylene can improve the composite powder particle morphology and make reed powder and copper powder mixing more even. Adding polyethylene has little effect to the powder tap coefficients but can reduce mixed powder compression performance. When the addition amount of20%or less of PE influence is limited.(2) Based on the wood powder warm compaction techniques and principles, using rigid closed forming mould to prepare reed-based composite material. Using static bending strength, water absorption, surface hardness as response index, though response surface experimental design and analysis methods to optimize process parameters of the composites integrated. Getting the optimum conditions by warm compaction of toughening wood-plastic composites. They are particle size-20mesh, PE content10%, forming pressure80MPa, forming temperature152℃,copper powder content17%, temperature and pressure maintaining time of30mins.(3) Based on research in process performance of toughening wood-plastic composites, using advanced non-linear finite element analysis software MSC.Marc to simulate warm compaction process. Analysis the equivalent stress field, density, and temperature field in forming process of compacts. The author find that the test specimen face edge up and down easy to form stress concentration. Through the design of chamfering shape to the up and down stamping can improve the stress concentration phenomenon.(4) Under the optimum process conditions, the toughening wood-plastic composites we prepared whose surface hardness, abrasion loss and radial crushing strength can reach90HV and0.05g/100r and60Mpa. They are expected to replace iron pear wood of high-grade timber wooden handicrafts like tea table and paperweight. And also can instead of sintered bronze preparation textile machinery with light load sliding bearing.So the composite material reflects attractive application prospect.