Preparation And Study Of Modified Montmorillonite-Plant Fiber Composite Foaming Material

With the increasing emphasis on environmental issues around the world,low-carbon environmental protection and green recycling packaging design concepts have received widespread attention,and the elimination of non-degradable cushioning packaging materials has become an inevitable trend.Faced with the just-needed packaging materials,new energy-saving and environmentally-friendly materials are emerging.At present,plant fiber foam materials have become a research hotspot at home and abroad as an emerging packaging cushioning material.Although this material has been comparable in weight and cushioning properties to EPS foams,there are still problems such as high cost and difficulty in yielding,which limits it in practical applications.In view of the current problems of plant fiber foaming materials,this paper optimizes the formulation of bagasse-polyvinyl alcohol composite foaming materials,and organically modifies the montmorillonite and adds it to the optimized bagasse-polyvinyl alcohol.In the composite foamed material,the performance of the foamed material is improved.The specific research contents and conclusions are as follows:?1?Based on the previous studies,the formulation and reaction conditions of bagasse-polyvinyl alcohol composite foaming were further optimized,and the finally obtained optimal formulation ratio of the properties of the materials was:Bagasse:PVA:Starch:Foaming agent?NH₄HCO₃:NaHCO₃=1:1?:Sodium tetraborate:Calcium carbonate=16:3:3:4:0.1:3,foaming time is 15 min,foaming power is 700 W?medium high fire?.Finally,a bagasse fiber/polyvinyl alcohol composite foaming material having a foaming ratio of 1.163,a density of 0.110 g/cm³,a residual strain of 17.8%,and an elastic specific energy of 0.268 J/cm³ was obtained.?2?Montmorillonite K10 was modified by cetyltrimethylammonium bromide?CTAB?.The properties of the modified montmorillonite and the prepared composite foamed material were characterized by SEM electron microscopy,X-ray diffractometer?XRD?,standing wave tube sound absorption tester.The results show that the interlayer spacing of modified montmorillonite increases from 1.5224 nm to 1.9621 nm.When the modified montmorillonite is added at 4%,the optimal performance of the modified montmorillonite-bagasse fiber composite foaming material is prepared.At this time,the foamed material obtained had an expansion ratio of 1.223,a density of 0.078 g/cm³,a residual strain of 40%,and an elastic specific energy of 0.322 J/cm³.?3?In the current research,the fiber foamed material obtained by the semi-free foaming method is not controlled by pressure,and the surface of the material is uneven and the thickness is uneven.In view of the above problems,this paper developed a microwave-specific foaming mold with a water filtering device and a foaming device.According to the characteristics of microwave foaming and the conditions required for the foaming process,the applicability of foaming mold was verified through several experiments.In summary,the modified montmorillonite-plant fiber composite foaming buffer material prepared has excellent cushioning performance,low density and degradability.The mechanics and surface structure of the foamed material prepared by using the optimized formula have been greatly improved.After the microwave foaming mold is used,the problem of uneven thickness and uneven surface during the free foaming process is effectively solved.The results show that the optimal formulas make up for the shortcomings of previous research,and accelerates the industrial application of plant fiber foam materials.In addition,the sound absorption test of the new foam material was carried out,and it was found that the sound absorption performance of the material was superior.The addition of modified montmorillonite made the composite foamed material have flame retardancy and barrier properties,making up for the shortcomings of plant fiber foam materials used in sound absorption,broadening the application fields of modified montmorillonite-bagasse fiber composite foam materials.