Study On Inorganic Modification Of Furniture With Hydrothermal-Solvent Heat

China is a country of large amount of wood furniture production.However,with the decrease of natural wood forests,how to employ the fast-growing wood to ease the contradiction between supply and demand of wood.Nanometer material is gradually applied to wood modification to improve the function of the wood and added value of the material.Hydrothermal-solvent thermal method is a controllable method for synthesis of nanomaterials.In this paper,nano TiO₂ and CaCO₃ were synthesized by hydrothermal-solvent thermal method.After that,the materal was given to poplar by impregnation treatment to improve the performance of poplar.To find out the effects of temperature and acidity on the morphology,particle size and growth of the TiO₂ and CaCO₃ particles were analyzed by using the environmental Scanning Electron Microscope（SEM）and its attached Energy Dispersion Spectrometer（EDS）.By empolying universal mechanical testing machine,ultraviolet aging box,contact angle measurement instruments,cone calorimeter and so on,the physical and mechanical properties of modified materials,ultraviolet aging resistance,hydrophobic property,flame retardancy were analyzed,the main conclusions are as follows:（1）Through the water/solvent hot method on the surface cypress grow TiO₂,CaCO₃,TiO₂/CaCO₃ nanocrystalline layer,and through the EDS（attachments on the SEM）of cypress wood surface element analysis,Ti or Ca were found in the cypress wood surface.Therefore,we can infer cypress grow out of the TiO₂,CaCO₃,TiO₂/CaCO₃.Under alkaline conditions,TiO₂particles are spherical and dispersive,and the particle size of TiO₂ particles decreases slightly as the temperature increases,and the production amount increases.When PH=10 and T=90℃,the particle size of TiO₂ is about 100 nm.The reaction cannot produce CaCO₃ at lower temperature.When the temperature reaches 80℃,the rod-shaped CaCO₃ particle was generated,the particle size is nearly about 250 nm in width,2 microns in length.With the increase of temperature,the production of CaCO₃ decreases.（2）After TiO₂ modification,the increase rate of weight of the poplar was 18%to 20%,and the PH value had little effect on the weight gain rate.When PH=10,the increase rate of TiO₂modified material and TiO₂/CaCO₃ modified material decreased with the increase of temperature.When PH=7,70℃,TiO₂ modified material has the larget weight gain rate（20%）.All dry density of the material were increased.By comparing the total dry density and the total dry density coefficient K value,we can find that in alkaline conditions,TiO₂ modified material of dry density increases with the rise of temperature.On the basis of the added CaCO₃ can further improve the modification of the dry density.When reached PH=10,T=80℃,the largest dry density of TiO₂/CaCO₃ modified material was reached（0.54 g/cm³）,increased by 23.3%.（3）At the temperature of 70℃,the total dry shrinkage rate and the total dry^water to wet bilge rate of the TiO₂ modified poplar is much less than the untreated samples.With the rise of PH,the efficiency decreases.Dimensional stability increases than the untreated samples.At the same temperature,the drying shrinkage and moisture expansion ratio of TiO₂/CaCO₃modified material were greater than that of TiO₂ which indicates the stability of the size was worse.Therefore,under alkaline conditions,it is beneficial to improve the dimensional stability of poplar.However,the increase of temperature or the addition of CaCO₃ will reduce the dimensional stability of poplar.So when the PH=10 and the temperature is 70℃,the given cypress TiO₂ helps to improve the dimensional stability of poplar with the best efficiency.（4）After TiO₂ modified cypress,the bending capacity and hardness are improved obviously,especially at T=70℃with PH=3,or PH=10,T=80℃,the best bending strength was achieved（29%and 27.6%respectively）,the bending elastic modulus increased by 200%and 173.1%.The best hardness modification of the poplar was achieved when the PH=10,temperature 90℃,TiO₂ modified.The diameter stability of a material is increased by 43.1%,string surface increased by 63.8%,face increased by 58.9%.（5）Through the experiment of ultraviolet aging of 500h,the change value of the modified material’s brightness,red and green index and yellow and blue index is far below the change value of the untreated samples,indicating that the anti-ultraviolet capability of the modified material has been improved.When PH=10,T=80℃,the TiO₂ modified material has good anti-ultraviolet aging ability（?=3.68）.（6）Under the process conditions of PH=3,T=7℃,the preparation of TiO₂ nanocrystalline layer,and under the process conditions of T=90℃,the preparation of CaCO₃ nanocrystalline layer,the hydrophobic property and flame retardancy of cypress wood can be improved.The water contact angle is 126.5°and 130.16°respectively,increased by 101.1%and 110.1%compared to the untreated samples.So,the treated samples belong to the hydrophobic material.The thermal release rate of TiO₂ was increased by 5.6%,the total heat release decreased by 11.3%,the total amount of smoke decreased by 13.7%and the mass loss remained unchanged.For the CaCO₃modified material,the heat release rate decreased by 3.8%,total heat release decreased by 15.8%,total smoke emission decreased by 9.0%,and mass loss remained unchanged.（7）Analysis by comparing physical and mechanical properties of the modified cypress wood and normally used furniture wood,level the properties of the furniture wood.By analyzing the acceptance of the normally used furniture wood and the modified poplar,we found that modified cypress wood furniture for youth is a good choice.Based on the young people demand for environmental protection,diversity,and changeable,we put forward the contracted design style,the material mixing and functional diversity.