| Degradable environment friendly packing material becomes new research hotspot of packing engineering at present and developing trend of packing material research field in future. In this study, corn starch/rice straw fiber, corn starch/corn straw fiber, potato starch/rice straw fiber, potato starch/corn straw fiber were respectively adopted as basis material and reinforcer, polyvinyl alcohol (PVA), water, veiscent was added to prepare the four types of degradable foamy cushioning materials. Based on orthogonal experimentation, the optimized molding process parameters and the optimized mixture ratio of raw materials were obtained by orthogonal analysis to4types of foamy cushioning materials. Moreover, the compression resistance, resilience, density, hygroscopicity, microstructure°radability of cushioning materials were studied. The main research results obtained were as follows:(1) The optimized molding process parameters:preheating time was15min, molding temperature was160℃, molding pressure was2.0MPa, curing time was2min. Based on these process conditions, the compression resistance of foamy cushioning material prepared was better and density was smaller.(2) PVA, vesicant, mixing ratio of starch&straw were greater impact fators to compression resistance. With increase of PVA content and decrease of vesicant content, the compression resistance of cushioning materials became better. The compress resistance of foamy cushioning materials with corn straw fiber as reinforcer was better than rice straw fiber. The new materials were prepared by optimized mixture ratio of compress resistance, compared with expanded polystyrene (EPS), the compression resistance of the materials were better, but specific strength weaked.(3) PVA content was greatest impact fators to resilient. With increase of PVA content, the resilient rate of cushioning materials were raised at first, and then declined. The resilience of materials with rice straw fiber as reinforcer was better than corn straw fiber. The new materials were prepared by optimized mixture ratio of resilience, compared with EPS, the resilient rate of the materials for the first two times were better, but after three times, the resilience losed effect easily.(4) PVA, veiscent&water were greater impact fators to density. With increase of PVA or water content, the density of cushioning materials decreased at first, and then increased. With increase of vesicant content, the density diminished.(5) The moisture rate of starch/straw foamy cushioning material with higher PVA content was lower. PVA can play a good moistureproof effect. Besides, the material had good degradation performance in humid environment.(6) Compared microstructure of EPS, the starch/straw foamy cushioning material had lesser closed bubble ratio. The size and distribution of bubbles were non-uniform.This study provided some beneficial references to carry out related research of starch/vegetable fiber cushioning material in the future, besides, provided new idea to research and develop degradable environment friendly packing material. |
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