Manufacturing method for impregnated wood and preparation method for impregnating resin
An impregnating liquid, wood technology, applied in the direction of impregnating wood, pressure impregnation, wood impregnation, etc., can solve the problems of large formaldehyde emission from wood, high wood cost and high cost, and achieve mechanical properties and dimensional stability improvement, formaldehyde emission. Low, short production cycle effect
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Embodiment 1
[0040] The sawn timber after sawing poplar logs is selected, and the air-dry density is 0.45g / cm 3 , the specification is: 1500×200×30mm, the impregnated wood is prepared according to the following method:
[0041] A. Primary drying: put the above-mentioned sawn timber into a drying kiln, control the temperature in the kiln to be 45-80°C, and the relative humidity to be 35-80%. Dry until the final moisture content is 3%, stop drying.
[0042] B. Impregnation: First, prepare the impregnation solution, including the following steps:
[0043] Feeding: Weigh 500kg of formaldehyde, 800kg of urea and 1kg of sodium hydroxide, put them into the reaction kettle, and stir evenly;
[0044] Reaction: Raise the temperature of the reactor to 40°C. After 0.8 hours of reaction, adjust the pH value to 7 with formic acid, continue the reaction for 1 hour, and adjust the pH value to 8 with sodium hydroxide;
[0045] Discharging: After the reaction is completed, continue to cool to 35°C, and the...
Embodiment 2
[0057] The sawn timber after sawing poplar logs is selected, and the air-dry density is 0.45g / cm 3 , the specification is: 1000×150×20mm, the impregnated wood is prepared according to the following method:
[0058] A. Primary drying: Put the above-mentioned sawn timber into a drying kiln, control the temperature in the kiln to 45-80°C, and the relative humidity to 35-80%. Dry until the final moisture content is 4%, stop drying.
[0059] B. Impregnation: First, prepare the impregnation solution, including the following steps:
[0060] Feeding: Weigh 1000kg of formaldehyde, 450kg of urea and 5kg of sodium hydroxide, put them into the reaction kettle, and stir evenly;
[0061] Reaction: heat up to 80°C, wait for 0.5h to react, adjust the pH value to 7.5 with oxalic acid, continue the reaction for 0.5h, adjust the pH value to 10 with sodium hydroxide;
[0062] Discharging: After the reaction is completed, continue to cool to 40°C, and then discharge;
[0063] Preparation of im...
Embodiment 3
[0074] The sawn timber after sawing poplar logs is selected, the air-dry density is 0.45g / cm3, the specification is: 1000×150×20mm, and the impregnated wood is prepared according to the following method:
[0075] A. Primary drying: Put the above-mentioned sawn timber into a drying kiln, control the temperature in the kiln to 45-80°C, and the relative humidity to 35-80%. Dry until the final moisture content is 5%, stop drying.
[0076] B. Impregnation: First, prepare the resin, including the following steps:
[0077] Feeding: Weigh 750kg of formaldehyde, 650kg of urea and 3kg of sodium hydroxide, put them into the reaction kettle, and stir evenly;
[0078] Reaction: heat up to 60°C, wait for 0.75h to react, adjust the pH to 7.25 with ammonium chloride, continue the reaction for 0.6h, adjust the pH to 9 with sodium hydroxide;
[0079] Discharging: After the reaction is completed, continue to cool to 30°C, and then discharge;
[0080] Preparation of impregnation solution: Put ...
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