Modification of poplar wood reforced by PF resin
The test materials of poplar were enhanced by dipping PF. Three factors, including dipping concentration, dipping time and vacuum degree, were discussed in the influence of the rate of medicine with the orthogonal test method, and the optimized impregnation process was obtained. At the same time, compression ratio, hot pressing time, hot pressing temperature were discussed in the influence of physical and mechanical properties by using single factor experiment method, the optimized hot pressing process was found. The optimized treatment process was that vacuum of 80KPa, PF of 25%, dipping time of 6h; compression rate of 25%, hot pressing temperature of 200°C, hot pressing time of 20min. Results showed that: the average parameters of poplar which was processed was that MOR of 90.1Mpa, MOE of 9199Mpa, the surface abrasion loss of 0.114g/100r, density of 0.53g/cm3, thickness expansion rate of water absorbing of 7.46% and compression deformation recovery rate of 21.86%. Physical and mechanical performance and dimension stability were improved by densification, the poplar plank after processed was in line with the standard of base material of wood multi-layer floor.