| In this paper, starting from the perspective of the use of waste rice husk in agriculture and wood residues, based on prior research results in the preparation process rice husk/wood particle composite board, to improve bending properties and tensile strength of composite board for the purpose, by adding reinforcing materials and optimization of the process parameters, the rice husk/wood particle composite boards for performance enhancement has been studied.This study is based on original main materials including rice husk, wood particle, UF, PAPI and curing agent, and is based on original craftsmanship. Bamboo bundles using UF, wood particle and coupling agent are respectively selected and used as reinforcing materials. By adding reinforcing materials or optimizing the process parameters, according to the different purposes and ways of strengthening, the four researches are designed:(1)The bamboo bundles which is using UF is used to enhance the bending resistance of the composite boards. Based on uniform design method, the effect on the properties of the composite board is studied by adding the amount of bamboo bundle, core layer resin consumption, the hot pressing temperature and the hot pressing time.(2)The wood particle using PF in the core layer is used to enhance the tensile strength of the composite board, and the effect on the properties of the composite board is studied by the adding amount of wood particle.(3)Optimizing process parameters is used to enhance the mechanical properties of the composite board. Based on uniform design method, the effect on the properties of the composite board is studied by density, core layer resin consumption and the hot pressing time.(4) By using PF with low cost as the core layer adhesive instead of PAPI, the effect on the properties of the composite board is studied by adding the coupling agent and PF. The effect of the types and the adding amount of the coupling agent on the properties of the composite board is studied, and the microscopic characteristics of composite materials is analyzed by FTIR.The data of (1)and(3) experiments are analyzed by data analysis software ’SPSS 19.0’. And the trend diagrams on the influence from single factor to composite boards’ various of properties are obtained by software ’Uniform Design4.0’. In (2)and (3) experiments, ’origin9.0’ is used to draw graphs on the influence of variation factors to composite boards’ various of properties. By analyzing the trend diagrams and graphs, the experimental results can be acquired that four enhancement approaches could be effective to improve the mechanical properties of the composite board. Considering comprehensively by combining with the cost and properties, the experiment’s scope is restricted to:(1)The bending resistance of the composite boards is enhanced by the adding bamboo bundles. When adding amount of bamboo bundle is 10%,the core layer resin consumption is 6.0%,the hot-pressing temperature is 180℃,and the hot-pressing time is 30s/mm, we can get the optimal reinforced composite board.(2)With the increase of the amount of wood particle, the tensile strength and internal bonding strength of composite boards increased. The best adding amount of wood particle (accounted for the proportion of the core layer) is 40%.(3)The increase of the density of the composite boards can significantly improve the mechanical properties of the composite boards. When the density of bamboo bundle is 10%,the core layer resin consumption is 6.5%, and the hot-pressing time is 30s/mm, we can get the optimal reinforced composite boards.(4)The mechanical properties of the composite boards are enhanced by adding coupling agent. When the type of coupling agent is KH-550 and the adding amount of coupling agent is 2.5%,we can get the optimal reinforced composite boards. Analyzed by FTIR, it is found that coupling agent in the rice husk and PF played a good "bridge" role. |
