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

Active Publication Date: 2015-04-22
GUANGZHOU HOLIKE CREATIVE HOME FURNISHING
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, phenolic resin solution and urea-formaldehyde resin solution are mainly used for wood resin impregnation. The preparation process of the resin is relatively complicated and the production efficiency is low. At the same time, due to the high price of phenolic resin, most enterprises prefer urea-formaldehyde resin. The amount of formaldehyde released from wood is large, so it cannot be directly applied to indoor furniture, decoration and flooring industries
In addition, compared with other woods, poplar wood is acidic, which makes some resins react with the acidic components in the wood during the impregnation process, and cannot be uniformly impregnated into the wood, especially for impregnation of thick wood, it is difficult to achieve thickness Uniform impregnation on
[0004] Publication No. CN1208171C Chinese patent document "furan polymer impregnated wood, method for preparing the polymer and use of the polymer" discloses a furan polymer impregnated wood to achieve a uniformly distributed color and density in the wood, but High cost, poor machining performance after treatment
Chinese patent document CN1281388C discloses a resin composition for impregnating wood and an impregnating resin. The resin composition for impregnating wood is a resin composition containing a (meth)acrylic acid polymer component and a radically polymerizable monomer component. A resin composition for impregnating wood that can provide a cured resin coating film with excellent curability and sufficient durability for impregnated wood. Product quality of impregnated wood
Chinese patent CN102699966A discloses a method for modifying fast-growing wood based on in-situ polymerization. Although this method can accelerate the curing of the resin in the impregnated wood through high-temperature treatment in the later stage, the high-temperature drying treatment will undoubtedly make the resin on the surface of the impregnated wood very fast. Curing will lead to defects such as cracking and deformation of the board during later drying, which will affect the subsequent processing and utilization of impregnated wood
This method can solve the disadvantage of low surface hardness of cork profiles, but it is easy to rebound in wet environment after compression, which makes it subject to certain restrictions in application
In addition, the Japanese scholar Masafumi Inoue used the method of "impregnation + compression" to prepare a new type of impregnated compressed wood. This method can improve the mechanical properties and dimensional stability of wood, and at the same time use resin impregnation to make the wood surface compressed. The timber cost that method obtains is higher, is unfavorable for production and popularization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention provides a manufacturing method for impregnated wood and a preparation method for impregnating resin. The manufacturing method for the impregnated wood comprises the steps of primary drying, impregnating, secondary drying and hot and wet treatment. The mechanical property, the formaldehyde emission and the size stability of the impregnated wood manufactured through the method are obviously improved, and the impregnated wood can meet the using requirements of furniture and decoration such as cabinets, chests and doors and windows and wood floors. The preparation method for the impregnating resin comprises the steps of feeding, reacting and discharging, raw materials needed for preparing the resin are simple and easy to store, and under the condition that the water content of the wood is low, the resin can evenly impregnate the wood.

Description

【Technical field】 [0001] The invention relates to a method for preparing impregnated wood and impregnated resin, belonging to the field of wood processing. 【Background technique】 [0002] In recent years, with the implementation of the natural forest protection project, the processing of wood has gradually changed from natural forest to fast-growing forest. However, fast-growing wood such as poplar has defects such as low hardness, poor dimensional stability and easy decay during use, making it difficult to use. As industrial and furniture materials, it is only used for papermaking and particleboard, and cannot be directly used for solid wood. For the defects of fast-growing wood itself, the use of resin impregnation can improve the mechanical properties and dimensional stability of wood, and can also improve the decay resistance of wood. [0003] In order to solve the problem of solid wood utilization of fast-growing wood in our country, resin impregnation is one of the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/08B27K5/04B27K1/00B27K3/52
CPCB27K3/0214B27K3/0278B27K3/08B27K3/52B27K5/04
Inventor 张振伟凃登云张婷婷詹缅阳欧红兰王彬欧明花肖海潮
Owner GUANGZHOU HOLIKE CREATIVE HOME FURNISHING
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