| Common Chinese fir(Cunninghamia lanceolata) has a high percentage in plantations, which has many advantages, but its low intensity, low wear resistance, low defects density, which directly affects its use and production’s quality, functional improvement on the Common Chinese fir has become inevitable. Since the beginning of the21st century, the development of nano-science benefits to the field of wood science and technology, some scholars have a lot of its bulk material characteristics of the inorganic nano particles, and the Common Chinese fir also has to accommodate the internal structure of the nano particles, inorganic nano particles and wood composites, their physical properties, as well as hardness, resistance to surface abrasion and other mechanical properties have been improved. Based on this, this study was the higher cost of nano-CaCO3modified Common Chinese fir material as a compound modifier, get Common Chinese fir nano-CaCO3composites, combined with a laser particle size analyzer, scanning electron microscopy, X-ray diffraction (XRD), Fourier transform infrared spectrometer analysis of the Common Chinese fir nano-CaCO3composite structural characterization and mechanism analysis of inorganic nano-materials-wood composite to provide a theoretical reference.The main conclusions of this study are as follows:(1) Detected by using a laser particle size analyzer modified nano-CaCO3particle size:draw temperature80℃, the main pH of9, mixing time30min, ultrasonic dispersion time5min, the coupling agent4%of the accounts for the quality of nano-CaCO3nano particles measured the smallest dispersion;(2) Common Chinese fir nano-CaCO3composite physical and mechanical properties test results showed that:a compound coupling agent modified nano-CaCO3particles and Common Chinese fir composite diameter surface and the chord surface hardness of the obtained composite to improve the most obvious, while the in situ composites the wear resistance of the composites obtained by the modified most obvious;(3) By scanning electron microscopy (SEM) analysis of the results obtained:the average particle size of nano-particles of modified inorganic nano-CaCO3particles composite materials in situ composite Modification than the compound coupling agent is smaller, a large proportion of nano level and more uniform dispersion; compound the average particle size of the coupling agent composite is relatively small, there are many in the nano scale, just enough evenly dispersed, but the method is relatively simple compound coupling agent modified composites, the cost is relatively low, Which is a kind of good to composite modified method;(4)X-ray diffraction analysis was used to compare the unmodified nano-CaCO3particles cedar-composite materials, nano-CaCO3composites, a single coupling agent modified nano-CaCO3particles obtained compound coupling agent modified nano-CaCO3particles composite materials, nano-CaCO3particles of different concentrations of coupling agent for composite materials obtained compound coupling agent modified, and to maintain the coupling agent4%Common Chinese fir nano-CaCO3composite material specimen crystal diffraction intensity of the strongest, nano-CaCO3particles generated under such conditions the crystal polymorphs closest standard crystal form, nano-CaCO3particles and fir wood composite, its own crystal form has not been changed;(5)Detected by Fourier transform infrared spectroscopy analysis, compare the above four cases Common Chinese fir nano-CaCO3composites, the results also proved that:used4%coupling agent nano-CaCO3particles composites, and Common Chinese fir compared to the material, the hydroxyl peak changed the most, while other peaks change significantly Therefore, the composite of nano-CaCO3particles and cedar is not simply piled up and fill the chemical combination, but with the structure of groups of Common Chinese fir, causing the displacement of the peaks change; addition also composites modified with4%coupling agent Common Chinese fir the best. |
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