Research On Preparation And Cushioning Properties Of Wood Residues Fiber Porous Material

Cushion materials are widely used in the packaging containers, such as household appliances, precision instruments, electronic computer, electronic components, ceramic and glass containers etc., in order to protect the products to avoid or reduce the damage during the transportation and storage. Now the cushion materials are mainly plastic foam, although they have superior cushioning properties, but the degradability leads to recycling and reclamation of the waste causing severe damage to the environment, so it is imperative to develop a new type of cushion material with superior cushioning performance and environment friendly.The purpose of this investigation is to explore the method that application of modified wood residues fiber prepares porous foaming materials. Base on a large number of experiments, we preliminarily determined the main compositions of material system and the contents of each component, we finished the optimization experiment designs on the material composition and molding process based on the Response Surface Method. We established the response surface equations and solved the optimal solution to determine the optimal formulation and molding process.The optimal schemes of the formula were including wood fiber35g. glue20%, foaming agent7g, propanetriol20mL, French chalk5g, predictive density0.331g/cm3, the minimum cushion coefficient6.366, rebound rate94.3%. The optimal schemes of forming process were including hot pressing temperature147.98℃, pressure2.6kPa, hot pressing time22.05min, predictive density0.299g/cm3, the minimum cushion coefficient6.092.The performance parameters of the porous material were about that aperture ratio31.3%, aperture diameter56.82μm. density0.312g/cm3,foaming ratio1.68～1.73, Deformation energy absorption0.326J while strain57.7%, the minimum cushion coefficient6.08. At the load was2MPa and4MPa, the residual deformation was kept within20%after5760min, it could demonstrate the material had good creep properties and dimensional stability.In order to found the protection performances of the materials during actual transportation, we made the combination sample of corrugated board and cushion, it obtained the the minimum cushion coefficient was reduction in313.44%at σ-0.3kgf/cm2, the response peak acceleration decreased by84.59%. And then we made the computer power as the protection object, testing drop height at0.8m or the level impact velocity at4m/s or inclined impact height at0.8m, it was found the performance of computer power was not damaged, we could conclude the cushion had excellent buffering and vibration control performance.The samples fracture morphology were better with a digital microscope and scanning electron microscopy, the fibers bonding with each other, and the glue and filler distribution. The functional groups of the molecular structure were determined by FTIR&XPS, and using TGA test, it was found that the retention rate was35%～45%, the results showed the thermal stability of the material was better.From this study, we can observed that the wood residues fiber porous material has excellent energy absorption performance by unit volume and good dimensional stability and moisture resistance and thermal stability and environmental friendly etc.. It can be used as cushion packaging material. This study provides a new approach for wood residue utilization, and develops of the experimental basis and reference.