Study On The Dispersion Mechanism Of Nano Particles In The Composites Of Wood With Nano Inorganic Particle

Wood, as an important organic polymer of renewable natural. People like it because of its unique characteristics, such as visual, tactile, auditory and environment-friendly. But due to the characteristics of easy corrosion, easy to burn and so on, this inherent defects seriously limit the use of wood. Inorganic nano particles have some superior feature, for small dimension effect, surface effect, the macroscopic quantum tunnel effect and so on. In recent years, research have shown that the use of inorganic nano particles modified on the wood, can improve wood of the mechanical properties, corrosion resistance and can make it have certain flame retardant at the same time. Also research has found that strengthening effect for the inorganic nano particles on wood composite is obvious, but the micron particles of the show not conform to the corresponding feature, the reason for this phenomenon is that nano particle keep nano dispersion is the key of inorganic nano particle reinforced composite, whether the nano particles break the inherent characteristics is the major cause. Therefore, it is necessary to study the dispersion of inorganic nano particles in the wood.Based on this, this paper choose the nano-CaCO3 and nano-SiO2 represent for inorganic nano particles, enhanced wood fiber/PP composites, in order to research the dispersion mechanism of nano particles in the wood based composite. In this study, in the first, modified the nano particles, keep the nano particles nano scale not only improve the interfacial compatibility of different material, also can ensure the good dispersion in wood fiber/PP, Analyzer the inorganic nano particles before and after the modification by Malvern laser particle size analyzer, FTIR and TG analyzer. Then two kinds of inorganic nano particles preparation nano particles strengthen through different preparation technology of the preparation of nano particles, wood fiber/PP composites reinforced with added nanometer particles by SEM characterization of composite materials, and SEM image analysis and processing, the introduction of inorganic nanometer particles dispersed in polymer matrix model, deduced the correction in the decentralized model of wood fiber/PP composite materials, and evenly dispersed through X-ray diffraction characterization observation after its structure change, testing mechanical properties and water absorption of the composite material to verify the accuracy of the dispersion model. The main research conclusions are as follows:(1) Modified nano-CaCO3 by KH570 and octadecanoic acid, modified nano-SiO2 by KH570, the results show that when the mass fraction of KH570 was 10%, optimum dispersion of nano-CaCO3 modified optimun, the minimum value of oil absorption, the maximize value of the activation, after modification, the nano-CaCO3 size are mainly concentrated in 50-70 nm, through FTIR showed that modification agent KH570, stearic acid successfully grafted in nano-CaCO3 particle surface, TG results show that the modifier in the nano-CaCO3 surface grafting quantity was approximately 10%. When the mass fraction of KH570 was 5%, optimal distribution effect of nano-Si02, maximum value after the modification.of nano-SiO2 particle size were mainly distributed in 40-60nm, characterized by FTIR showed that modified nano-SiO2 coupling agent KH570 grafted on nano-SiO2 surface, TG results show that the modified agent KH570 in nano-SiO2 surface grafting quantity is approximately 23%;(2) Through different surface modification methods of nanometer calcium carbonate and different mass fraction of nano-CaCO3 wood fiber/PP composites, respectively, the results show that when the mass fraction of KH570 respectively for 10%, mass fraction of nano-CaCO3 was 5%, the mechanical properties and water absorption of the composite material to improve the most significant, after derivation and correction of nano-CaCO3 in wood fiber/PP composite material dispersion model is consistent with the experimental results;(3) After different surface modification methods of nanometer silicon dioxide and different mass fraction of nano-SiO2 dioxide wood fiber/PP composites, respectively, the results show that when the mass fraction of KH570 respectively is 5%, nano-SiO2 mass fraction of 3%, the mechanical properties increase quantity is the most significant, water absorption of the composites reduced, after derivation and fix the nano-SiO2 in wood fiber/PP composite material dispersion model is consistent with the experimental results;(4) Compared to different nano particles and preparation technology of nanometer particles in wood fiber/PP composite material dispersion effect, the results showed that the dispersion of nano-SiO2 dioxide in wood fiber/PP was better than nano-CaCO3, its mechanical properties increased, water absorption of the composites reduced, the result which better than that of nano-CaCO3 on the influence of the composite materials.