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Method for modifying plantation wood with phenol and aldehyde impregnation

A plantation and wood technology, applied in the direction of impregnating wood, wood treatment, wood heating, etc., can solve the problems of high equipment and process requirements, inconvenient promotion and utilization, etc., to improve the impregnation effect and uniformity, and improve the degree of immersion and uniformity. The effect of improving the depth of immersion and uniformity

Active Publication Date: 2020-02-07
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has high requirements on equipment and technology, which is not easy to popularize and utilize.

Method used

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  • Method for modifying plantation wood with phenol and aldehyde impregnation
  • Method for modifying plantation wood with phenol and aldehyde impregnation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method of phenolic-aldehyde impregnated modified plantation forest timber of the present invention, such as figure 1 shown, including the following steps:

[0028] (1) The Chinese fir timber is sawn into a size of 10mm×10mm×200mm, and dried to a moisture content of 12%. Dissolve 50g of NaOH in 117g of water, mix evenly with 188.22g of molten phenol, make A liquid, and set aside. Put the fir wood with a moisture content of 12% after drying into the impregnation tank, vacuumize the impregnation tank to -0.085MPa, and keep the pressure for 10 minutes, so that the air in the wood cell space is drawn out, and then start to enter the liquid, passing through the tank The negative pressure of the medicine A liquid is sucked into the tank and does not pass through the wood. After entering the liquid A, the negative pressure is unloaded, and then a positive pressure of 0.5MPa is applied to the tank, and the pressure is kept for 50 minutes. A thrust of liquid A makes the wood ...

Embodiment 2

[0032] A method of phenolic-aldehyde impregnated modified plantation forest timber of the present invention, such as figure 1 shown, including the following steps:

[0033] (1) Poplar wood is sawn into 20mm×20mm×400mm, and dried to a moisture content of 10%. Dissolve 60g of NaOH in 90g of water, melt and mix with 188.22g parts by weight of phenol evenly, make A liquid, and set aside. Put the dried fir wood with a moisture content of 10% into the impregnation tank, vacuumize the impregnation tank to -0.095MPa, keep the pressure for 20 minutes, and then start to enter the liquid, and suck the liquid A into the tank through the negative pressure in the tank There is no wood in the tank. After entering the liquid A, unload the negative pressure, and then apply a positive pressure of 0.9MPa to the tank, and keep the pressure for 40 minutes. Completely, and accelerate the speed of dipping, can effectively shorten the dipping time, and then discharge excess A liquid.

[0034] (2) ...

Embodiment 3

[0037] A method of phenolic-aldehyde impregnated modified plantation forest timber of the present invention, such as figure 1 shown, including the following steps:

[0038] (1) Saw pine wood into 40mm×40mm×800mm, and dry to 8% moisture content. Dissolve 70g of NaOH in 70g of water, melt and mix with 188.22g parts by weight of phenol to prepare A liquid, and set aside. Put the dried fir wood with a moisture content of 10% into the impregnation tank, vacuumize the impregnation tank to -0.1MPa, keep the pressure for 30 minutes, and then start to enter the liquid, and suck the liquid A into the tank through the negative pressure in the tank There is no wood in the tank. After entering the liquid A, unload the negative pressure, and then apply a positive pressure of 1.1MPa to the tank, and keep the pressure for 30 minutes. Complete, and accelerate the speed of dipping, can effectively shorten the dipping time; discharge excess A liquid.

[0039] (2) Vacuumize the impregnation ta...

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Abstract

The invention discloses a method for modifying plantation wood with phenol and aldehyde impregnation. The method comprises the steps of providing the negative pressure, carrying out impregnation witha first solution, applying the positive pressure, discharging the extra first solution out, providing the negative pressure, carrying out impregnation with a second solution, applying the positive pressure, and discharging the extra second solution out, wherein breathing type circulating treatment is carried out according to the sequence of the steps, the first solution is a mixed solution of phenol, NaOH and water, and the second solution is a formaldehyde solution. With the method, the plantation wood modified with phenol and aldehyde impregnation can be obtained. According to the method formodifying plantation wood with phenol and aldehyde impregnation, by stimulating the biological breathing principle, the wood is treated in the manner of alternatively carrying out negative pressure expiration and positive pressure inspiration circularly, the impregnability of the wood is improved in a bidirectional manner, the impregnation effect and the uniformity are obviously improved, the reaction efficiency is high, and the excellent performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of wood functional improvement, and relates to a method for impregnating modified plantation wood with phenol-aldehyde, in particular to a method for impregnating modified plantation wood with a breathing phenol-aldehyde oligomer. Background technique [0002] my country's plantation area ranks first in the world, with eucalyptus and fir in the south, poplar and pine in the north. Due to its fast growth rate and short rotation period, wood from plantation forests has low density and poor quality. It is usually used in low value-added fields such as papermaking and wood-based panels. Functional improvement of plantation wood is an effective way to improve wood performance and added value. At present, the method of pressure impregnation is mainly used to press the modifier into the interior of the wood to achieve the purpose of wood reinforcement. However, when impregnating wood, it is difficult for many org...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/08B27K5/00B27K3/52B27K3/34
CPCB27K3/08B27K3/34B27K3/52B27K5/001
Inventor 左迎峰吴义强王向军周亚李萍李贤军张源
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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