| Multi-layer engineered artificial board is a new composite material,which starts late in our country as a high-end plank.The adhesive of preparationing the material,surface treatment and hot pressing process of the aluminum foil are high energy consumption,serious environment pollution and long production cycle,which results in its application is restricted.Using cheap,low formaldehyde adhesive and heat-press to rapid produce the artificial board has become a research hotspot.In this paper,engineered artificial board was prepared by the LVL structure design using poplar veneer as the substrate,aluminum foil as the functional material.The main research contents included: Selecting an optimal way of surface treatment of aluminum and rubber adhesion agent by hot-pressing experiment;Studying six kinds of hot-pressing process parameters on the composite performance impact by orthogonal experimental design and choosing the best process parameters through range and variance analysis.Exploring the effect of aluminum-foil location on burning properties of the plate by means of combustion performance test.Analyzing effect of laying position of aluminum foil in the plate on the properties of composite materials so as to provided reference for,optimizing the structure of man-made board.The results were as follows:(1)Superior bonding interface deriveded from mechanical grinding,washing and drying treatment of aluminum foil surface and with a low cost,simple operation,and less damage to environment.Phenolic resin,soybean protein adhesives and poly vinyl acetate emulsion all had bad effect on preparation of engineered artificial board which single of them.While mixing each two of them,high bonding strength,good water and heat resistance could be found when preparation of engineered artificial board by using hot pressing way with PF resin agent modified by PVAC.Adhesion agent of PVAc modified PF was optimized.(2)Preparation of multi-layer engineered artificial board by hot-pressing way and PVAc modified PF glue adhesion agent presented significant effects of the five physical and mechanical properties under different position of aluminum foil on the board.In addition,hot-pressing temperature and pressure and the ratio of adhesivehad significant effects on bonding strength.Hot-pressing time and pressure significantly influenced on static bending strength and the effect of MOE under other factors was not significant,Hot-pressing temperature and pressure had significant effect on impregnation stripping.Hot-pressing time and pressure,glue amount significantly influenced on soaking swell.(3)Analyzing the results of orthogonal experiment by range analysis,the best process parameters can be selected,and which showed Aluminum foil laying under the surface of the veneer,adhesive ratio of 2:1.5:1,Hot-pressing temperature was140 °C,Hot-pressing time was 15 min,hot-pressing pressure was 1.0 MPa and glue quantity was 240 g/m2.Preparation the multi-layer engineered artificial board by using the hot pressing process could exhibited national or over-national standard for the properties.(4)The existence of the aluminum foil could inhibit the burning and delay the releasing time and amount of harmful gas.With the change of aluminum foil from the center to the surface on single sides,Lit time increased by 5s,pk HRR values reduced by 92.45 k W/m2,Avg-HRR value reduced by 26.62 k W/m2,THR decreased by nearly 19.82 MJ/m2,TSR decreased by 171.9 m2/m2.In general,the aluminum foil in the outer plate could play flame retardant performance and which was better than that of aluminum foil in the middle or pure cypress wood plank.(5)Laying position of aluminum foil changed from inner to outer,which lead to plate agglutination intensity reduced,static bending intensity and elastic modulus rose,water resistant performance enhanced,and the change almost presented a linear change;Effects of laying position of the aluminum foil on compound panel ranked in order of Bibulous ply expands > Agglutination intensity > MOR > MOE;Aluminum foil in the outermost could presented significant effect on the capabilities of the plank,and that was the biggest enhancement. |
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