Wood carbonization and dipping treatment method

Abstract

The invention provides a processing method for carbonizing and impregnating wood and has the advantages of greater density and higher intensity of the processed wood, and short redrying time. The processing method comprises the steps of drying the soft wood till the moisture content is 10-14%; carbonizing the dried wood for 2 hours at 120-130 DEG C; placing the carbonized wood into an impregnating tank; adding resin with the curing temperature lower than 100 DEG C after vacuumizing the impregnating tank to rise the pressure in the tank to 0.4-0.6MPa; keeping the pressure for 3-5 hours; then putting the wood into a dry kiln; controlling the dry bulb temperature of a drying medium at 75-80 DEG C firstly, wherein the wet bulb temperature and the dry bulb temperature are close or equal to each other; lowering the dry bulb temperature to 54-56 DEG C and the wet bulb temperature to 52-54 DEG C after preprocessing for 22-26 hours, wherein the temperature rises again when the moisture content of the wood is reduced; and finally drying the impregnated wood at 80-90 DEG C to completely cure the resin.

Description

technical field [0001] The invention relates to the glue-dipping treatment technology of wood. Background technique [0002] After the wood is impregnated with low-molecular resin, the dimensional stability of the wood is significantly improved, the mechanical strength is improved, and the durability is extended. It can be used to make fixtures, doors and windows, and even used as building decoration materials. For example, after impregnating wood with phenolic resin, its corrosion resistance, acid resistance and insulation performance are greatly improved. The conventional wood impregnation method is: dry the wood (initial drying), then impregnate, and dry again. For example, for a poplar (soft wood) board with a thickness of 3cm, first dry it to a moisture content of 12%, then place it in a phenolic resin with a pressure of 0.5MPa for 4 hours, and then dry it at a temperature of 70-80°C (then dry it at 70-80°C). Drying) to get the impregnated sheet, and the drying time i...

AI Technical Summary

Problems solved by technology

The deficiency of this existing method is: 1, the density of dipped sheet material is lower

For poplar veneer, the density is about 0.4g / cm 3 , the maximum density of the board after dipping can only reach 0.57g / cm 3 , the strength and mechanical properties are not enough

2. The re-drying time is longer and the production efficiency is lower; the drying quality is poor, the wood surface is easy to shrink and uneven, and the volume loss is large when the wood is planed

3. Because the curing temperature of commonly used resins (urea-formaldehyde resin and phenolic resin) in production is 115-155°C, these resins cannot be completely cured when dried in a conventional kiln, resulting in a limited increase in wood strength

4. For 4-5.5mm thick poplar boards, during the drying process (15-17 days), the low-molecular-weight impregnated resin is pre-cured to form a pre-cured body, which blocks the water movement channel inside the wood and affects the drying speed , so the drying time is long