Method for preparing hydrophobic wood

A hydrophobic and wood-based technology, which is applied in the direction of impregnated wood, wood impregnation, wood processing equipment, etc., can solve the problems of changing wood color, high toxicity of modifiers, and single wood, so as to improve mechanical properties, durability, and mechanical properties And the effect of improving durability and improving dimensional stability

Inactive Publication Date: 2011-04-06
NORTHEAST FORESTRY UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The present invention provides a method for preparing hydrophobic wood in order to solve the problems of high toxicity, peculiar smell, change of wood color, complicated treatment process and only improvement of single performance of wood in existing wood modification methods.

Method used

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  • Method for preparing hydrophobic wood
  • Method for preparing hydrophobic wood
  • Method for preparing hydrophobic wood

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specific Embodiment approach 1

[0007] Specific embodiment one: the preparation method of the hydrophobic wood of the present embodiment is carried out according to the following steps: one, weigh 49%~99.5% of fluorine-containing polymerizable monomers, 0~50% of unsaturated monomers and 0.5% to 1% initiator, and mix evenly to obtain an impregnating solution; 2. Add the wood and the impregnating solution obtained in step 1 into the reaction tank, and immerse the wood in the impregnating solution, seal the reaction tank and pump Vacuum to -0.08MPa~-0.095MPa, and keep it for 15min~25min; 3. Release the vacuum and return to normal pressure, and then feed air into the reaction tank to make the pressure in the reaction tank reach 0.8MPa~1MPa, and keep it for 20min ~30min; 4. Reduce the pressure of the reaction tank to normal pressure, take out the wood, and then wrap the impregnated wood with aluminum foil, first place it at room temperature and normal pressure for 12h~24h, and then heat it to a temperature of 80℃~...

specific Embodiment approach 2

[0010] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, 54.1% to 94.4% of fluorine-containing polymerizable monomers, 5% to 45% of unsaturated monomers and 0.6 % ~ 0.9% of the initiator. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step 1, 79.2% of fluorine-containing polymerizable monomer, 20% of unsaturated monomer and 0.8% of initiator are weighed in mass percentage. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for preparing hydrophobic wood, relates to a method for modifying wood, and solves the problems that a modifier has high toxicity and peculiar smell and changes wood color, the treatment process is complex and only single performance of the wood can be improved in the conventional wood modification method. The method comprises the following steps of: mixing a fluorine-containing polymerizable monomer, an unsaturated monomer and an initiator to prepare impregnation liquid; adding the wood and the impregnation liquid into a reaction tank, vacuumizing, performing pressure treatment so as to inject the impregnation liquid into a pore structure of the wood, coating a test piece and ageing at room temperature and constant pressure; and heating and performing vacuum drying to prepare the hydrophobic wood. The method is simple, the wood color is not changed, peculiar smell is absent, the parallel-to-grain compressive strength is 70 to 98 MPa, the expansion resistance rate after the wood is continuously soaked in water for 200 hours is 48 to 65 percent, the weight loss ratio after 12 weeks of fungi erosion is 6 to 13 percent, the water contact angle is more than 130 degrees, and the wood can be widely used as indoor and outdoor structural materials and decorative materials.

Description

Technical field: [0001] The invention relates to a modification method of wood. Background technique [0002] Because of its unique composition and honeycomb porous structure, wood is prone to swelling and deformation caused by water absorption, cracking and warping caused by water decomposition, decay and degradation caused by fungus erosion, and combustion degradation caused by heat. For prolonging the service life of timber, improving its durability, people modify natural timber, and the existing method for timber modification has following several: one, utilize vinyl monomer (application number is the Chinese patent of 200710072699.2 ) or heterocyclic polymerizable monomers (international patent with publication number CN1671526A in China) to form polymers to treat wood to improve the mechanical properties of wood. The modifiers used in this method may be highly toxic or change the color of wood or cause The brittleness of wood is high; 2. Utilize crystalline copper sal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/08B27K3/50
Inventor 李永峰刘一星董晓英高佳丽
Owner NORTHEAST FORESTRY UNIVERSITY
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