Incidencia de la impregnación de madera con alcohol polivinilico y polietilenglicol en algunas propiedades físicas y mecánicas de pino oocarpa

Abstract

This research was performed with Pinus oocarpa Schiede ex Schltdl. Var. Ochoterenai of Forest Plantation of Colombia, which presents some important troubles that limiting its use, due to its low dimensional stability and mechanical resistance. Polymer impregnation treatments could reduce deformation and improve physical and mechanical properties of the wood. The aim of this research was evaluated the effect of polyethylene glycol impregnation with molecular weight 600 and 1500, polyvinyl alcohol and zeolite addition, on density, dimensional stability, static flexion and compression parallel to Grain. The samples were impregnated in hot bath at 95 °C for 8 hours, and then impregnated at room temperature for 16 hours. The assessment of the wood was carried out under the Colombian Technical Standards NTC 290, 663, 784 and other standards. The best results were obtained with the impregnation of polyethylene glycol 1500 where the density increased between 21 % and 24 %; the anti-swelling efficiency was 60 %; in static flexion the modulus rupture increased 20 %, modulus of elasticity 39 % and compression parallel to grain increased 8 %. Wood changed to the structural lumber category, improving in its mechanical and physical properties. Treatment with polyethylene glycol 600 provided lower anti-swelling efficiency (14%), and lower improvement in density (8%), and in mechanical properties (1% to 7%).

Keywords

• Anti-swelling efficiency
• density
• modulus of elasticity
• Pinus oocarpa
• polymers
• static flexion