Wood densification method by impregnating resin

A resin and wood technology, applied in the direction of wood impregnation, impregnated wood, wood processing equipment, etc., can solve the problems of high resin cost, too dark material color, and do not consider the compatibility of flame retardant stability and resin, so as to achieve enhanced antiseptic effect

Inactive Publication Date: 2004-04-21
陈万利 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is the problem of high resin cost, and the use of phenolic or phenolic-urea-formaldehyde resin may cause the color of the material to be too dark.
In addition, wood is a combustible material, and it is especially important to use flame retardants in building interior decoration. At present, only flame retardants are added as external ingredients, and the stability of flame retardants and their compatibility with resins are not considered. There are many inherent deficiencies in the flame retardant performance of reinforced wood

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Air-dry wood such as pine, fir, and eucalyptus with appropriate permeability (after degreasing or degreasing) to a certain moisture content (generally requiring 8-15%), and then impregnate with resin. The resin impregnation method adopts the hot-cold impregnation method. Under normal pressure, the wood is soaked in the hot resin for 3 hours to expand the gas contained in the wood, and then soaked in the cold resin for 3 hours, or the above hot resin The resin is directly cooled, and the remaining air in the wood is compressed to form a vacuum state, so that the flame retardant is pressed into the wood by external air pressure. The temperature of the hot resin solution is 80°C, and the soaking time can be extended or shortened according to the amount of resin absorbed and the nature of the impregnated wood.

[0029] After soaking the resin, the residual liquid on the surface is dripped dry first, and then air-dried to a moisture content of 15-20%.

[0030] When hot-pres...

Embodiment 2

[0032] Air-dry wood such as pine, fir, and eucalyptus with appropriate permeability (after degreasing or degreasing) to a certain moisture content (generally requiring 8-15%), and then impregnate with resin. Impregnated resin adopts full cell method: pre-vacuum stage: put the wood in a high-pressure container, evacuate to -0.8~-0.85MPa, and keep it for 30 minutes, and the air in the wood cells is pumped out. Then inhale the resin. Pressurization stage: After the resin is filled with the container, the vacuum is released, and the pressure is slowly increased to 1.4MPa, and kept for 2 to 4 hours. The length of time depends on the amount of resin to be absorbed. A pressure difference is created between the inside and outside of the wood and the resin is forced into the wood cells. Pressure relief stage: relieve the pressure and discharge the resin. Post-vacuum stage: In order to avoid continuous dripping when the wood is taken out of the pressure vessel, vacuumize again to -0....

Embodiment 3

[0036] Air-dry wood such as pine, fir, and eucalyptus with appropriate permeability (after degreasing or degreasing) to a certain moisture content (generally requiring 8-15%), and then impregnate with resin. The impregnation resin adopts the double vacuum method: the first vacuum stage: put the wood in a high-pressure container, evacuate to -0.5MPa, and keep it for 30 minutes, and the air in the wood cells is pumped out. Then inhale the resin. Pressurization stage; after the resin is filled with the container, the vacuum is released, and soaked under normal pressure for 8 to 24 hours. The length of time depends on the amount of resin to be absorbed. A pressure difference is created between the inside and outside of the wood and the resin is forced into the wood cells. Drain the resin after soaking. Post-vacuum stage: In order to avoid continuous dripping when the wood is taken out of the pressure vessel, vacuum at -0.5MPa for 5 minutes again.

[0037] The resin-soaked wood...

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PUM

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Abstract

A method for compacting wood by impregnating resin includes such steps as preparing resin from urea, guanidino contained compound, formaldehyde, phosphoric acid, ammonia water and organic polydrdroxy compound, impregnating wood in it, drying, and hot pressing at 140-160 deg.C under 10-30 MPa for 3-60 min while solidifying. The resultant wood features high strength and high flame-retarding performance.

Description

technical field [0001] The invention relates to modification of wood, in particular to a method for impregnating wood with a multifunctional water-soluble resin for compaction treatment. Background technique [0002] Although wood is a renewable natural resource, the long-term excessive logging of forest resources has reduced the large-diameter natural forest trees, and fast-growing plantation wood has gradually become the main material used. Due to the poor material quality of fast-growing plantation forests, the modification and utilization of fast-growing wood have attracted increasing attention, especially the strengthening treatment of wood to replace high-quality wood in furniture and decorative materials. a key direction. The best way to strengthen the treatment of wood is to impregnate some low-molecular resin into the wood, and then make it solidify under certain conditions. Without destroying the wood structure, the wood forms a plastic-wood structure, thereby inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/34
Inventor 吴子良陈万利
Owner 陈万利
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