Soft material single-board materials and wooden products with surface hardness improve
A veneer and soft material technology, applied in the field of wood processing, can solve problems such as stress concentration, damage, and affecting the compression rate of the surface layer, and achieve the effects of improving surface hardness and wear resistance, increasing application range, and increasing application value
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Embodiment 1
[0043] Low-molecular-weight phenolic resin: The molar ratio of formaldehyde to phenol is 1.5, so that formaldehyde and phenol are condensed in an aqueous solution of pH 9.42, and the water dilution at the end of the condensation is 1900% (20°C). Water dilution calculation formula: water dilution (%) = added water (ml) / resin amount (ml) × 100% (the same below).
[0044] The resin aqueous solution has a concentration of 5%, and the sapwood veneer is impregnated with the resin aqueous solution to make the resin dry matter in the veneer 5%. Formula for calculating dry matter mass: dry matter mass (%) = (dry weight after soaking-dry weight before soaking) / dry weight before soaking × 100% (the same below). Hot-pressing compression process conditions: temperature 140°C, time 10min, compression rate of veneer material 60%-65% (compression rate is controlled by thickness gauge, the following test is the same). The test result shows that the average surface hardness is 18.0N / mm 2 , The ma...
Embodiment 2
[0046] Low-molecular-weight phenolic resin: The molar ratio of formaldehyde to phenol is 1.5, so that formaldehyde and phenol are condensed in a pH 10.68 aqueous solution, and the water dilution at the end of the condensation is 600%.
[0047] The concentration of the resin aqueous solution is 15%, and the dry resin content in the veneer after the treatment is 13%. Hot-press compression process conditions: temperature 140℃, time 10min, compression rate of veneer material 45%-50%. The test result shows that the average surface hardness is 13.5N / mm 2 , The maximum value is 18.7N / mm 2 , The minimum value is 7.2N / mm 2 , Deformation recovery rate is 19%.
Embodiment 3
[0049] Low-molecular-weight phenolic resin: The molar ratio of formaldehyde to phenol is 1.5, so that formaldehyde and phenol are condensed in a pH 9.86 aqueous solution, and the water dilution at the end of the condensation is 600%.
[0050] The concentration of the resin aqueous solution is 15%, and the dry resin mass in the veneer after the treatment is 14%. Hot-press compression process conditions: temperature 140℃, time 10min, compression rate of veneer material 60%-65%. The test result shows that the average surface hardness is 16.6N / mm 2 , The maximum value is 26.2N / mm 2 , The minimum value is 7.0N / mm 2 , Deformation recovery rate is 7%.
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