Preparation And Strength Improvement Of Chemi-mechanical Pulp Fiber-based Porous Materials

Porous materials have a large application volume in transportation and logistics,industrial products,and consumer goods.Most of these materials are prepared from petrochemical products,which have poor degradability and need to be disposed of by landfill,incineration,etc.With the gradual upgrade of environmental protection awareness,the production,sales and application of disposable petrochemical products are restricted,which has promoted the research and development of renewable,degradable and green porous materials.Cellulose is the most abundant resource in nature,and the development of cellulose-based porous materials is of great significance.In this study,APMP were used to prepare porous materials by foam forming method.First,choose the economical poplar chemical mechanical pulp as the main raw material,and add the milled and unground industrial waste corncob waste(after xylose extraction)through the foam forming method to prepare the pulp fiber-based porous low-density material,Adjust and control the forming process parameters and physical properties,and explore the most suitable raw material ratio.The experimental results show that adding proper amount of corncob waste residue can play a certain synergistic effect,and the performance of unground corncob waste residue is relatively good.When the addition amount of unground corncob waste residue reaches 30%,the apparent density is 8.62 kg/m3,the sample structure is uniform,the physical properties are significantly improved,and the raw material cost is reduced to a certain extent.On the basis of optimizing the ratio of raw materials,the influence of different reinforcing additives on materials performance was discussed.The experimental results show that the addition of cellulose nanofibers can stablize the foaming rate,inhibit the shrinkage during the drying process,improve the strength to a certain extent,and the density range of the prepared samples is relatively stable.When the addition amount reaches 0.8%,the shrinkage rate of the fiber porous material begins to stabilize,and the strength performance of the porous material is optimal.When the addition amount reaches 2.5%,the internal structure is affected.By adding crude zein to the mixed slurry,the effect of improving the microstructure and macroscopic physical strength of the fiber porous material was investigated.When the added amount reaches 9.0%,the apparent density is 15.47 kg/m3,and its compression energy absorption is 51.18%higher than the sample without adding crude zein,and the compression resilience is improved.By co-gelatinization,the cationic starch is added to the mixed slurry and stirred evenly and then heated and gelatinized to investigate the effect of improving the strength performance of the fiber-based porous material.The experimental results show that when the amount of cationic starch is less than 15%,the apparent density of the prepared porous material is stable;when the amount of addition continues to increase,a flaky dense part appears inside,which affects the uniformity of the sample structure;when the addition amount is 20%,the apparent density is 27.74 kg/m3,and its compression energy absorption is 57.72%higher than the sample without cationic starch.The porous material has better compression resistance.The innovation of this subject lies in the use of traditional pulp fibers and industrial waste corncob waste as raw materials for fiber porous materials.Different reinforcement additives and control additives are selected to evaluate the internal microstructure of fiber porous materials and improve porosity,which help to build the foundation for further research and development.