Study On Preparation And Interfacial Bonding Property Of Waste Tetra Pak/Wood Particleboard

With the development of packaging technology and the market demand, Tetra Pak package has been widely used, it leads to large amount of waste Tetra Pak package at the same time. In order to improve the utilization of waste Tetra Pak and timber, protect the environment, and recycle of resources, this article, using the orthogonal experimental method, studied the preparation of Waste Tetra Pak/wood particleboard. Through physical and chemical testing, we obtained the optimum hot-pressing process of waste Tetra Pak/wood particleboard and process parameters of PVC veneer. In this experiment, we had used entity microscope to observe the interfacial bonding, used infrared spectroscopy to study the changes in chemical group and used thermal gravimetric analyzer and differential scanning calorimeter to study the thermal stability of this composite particleboard. The results are as follows:(1)The results of orthogonal test showed that, the optimizing process parameters of waste Tetra Pak/wood particleboard, with the thickness of 9mm, the density of 0.75g/cm3, were resin content for 14%, hot-pressing temperature for 150℃, hot-pressing time for 420s and Tetra Pak/sawdust mass ratio for 4:6. At this point, the MOR of the plate was up to 23.1MPa, the MOE of the plate was up to 2917MPa, the TS of the plate was down to 6.1%, they were all in line with national standards.(2) Using PVC to overlay waste Tetra Pak/wood particleboard with optimizing process parameters, we could get that:hot pressing temperature for 50℃-60℃, pressing time for 10s-20s, pressure over 0.02Mpa, were more conducive to PVC veneer. The formaldehyde emission of this veneer of particleboard was 0.3mg/L, reaching E1 level (GB 18580-2001, E1≤1.5mg/L), it can be used for indoor directly in El level; its surface abrasion reach (LY/T 1279-2008 value≥80r) 900r; its surface pollution resistance showed that there is no residual color in the surface, no cracking, no swelling, no softening and changing in color and gloss.(3) Using entity microscope to observe, the section structure of waste Tetra Pak/wood particleboard with optimizing process parameters was close, it had a continuous and complete interface which had strong combination. Adhesive and PE in Tetra Pak played a role of bonding between the materials, which is conducive to the distribution of stress, so as to improve the physical and mechanical properties of the plate.(4) Through determination of infrared spectroscopy, the reaction of long fiber pulp in Tetra Pak, PE and sawdust was conducive to the physical and chemical properties of the surface of the plate, they held together by chemical bonds in the functional groups; through thermogravimetric analysis, the content of Tetra Pak did not reduce the thermal stability of particleboard; by differential scanning calorimeter, the addition of sawdust hindered the formation of PE molecular chains to some extent, resulting in reducing the thermal stability of the composite particleboard.