CN103465325A

CN103465325A - Physical modification method for timber

Info

Publication number: CN103465325A
Application number: CN 201310416859
Authority: CN
Inventors: 金丹
Original assignee: TIANJIN JINSUI WOOD INDUSTRY Co Ltd
Current assignee: TIANJIN JINSUI WOOD INDUSTRY Co Ltd
Priority date: 2013-09-10
Filing date: 2013-09-10
Publication date: 2013-12-25

Abstract

The invention relates to a physical modification method for timber, which can solve the problems that an existing timber treating method cannot improve the timber performance comprehensively, equipment occupation area is large, energy consumption is high and the cycle is long. The physical modification method for timber comprises the following steps that timber with high water content is sawn into required specification, and inorganic resin type timber flame retardant or organic timber flame retardant is mixed with water to form a timber flame retardant water solution; the sawn timber is put into an ordinary pressure vessel with the timber flame retardant water solution to be soaked, or the sawn timber is put into a steel pressure vessel to be soaked with the flame retardant by sequential vacuumizing and pressurizing; then the sawn timber enters a panel high-pressure vulcanizing plant to be subjected to softening and drying; after softening and drying are completed, and the sawn timber is subjected to correction, leveling and physical modification still in the panel high-pressure vulcanizing plant, so as to complete the whole treatment process of the timber. The water content of various modified sawn timbers is tested to be lower than or equal to 6% in the condition of room temperature, thus achieving the purpose of comprehensively improving the physical performance of the timber, and having the advantages of being high in yield, low in energy consumption, pollution-free during production, and small in occupation area.

Description

A kind of timberphysics method of modifying

Technical field

The present invention relates to a kind of Wood treatment method, particularly a kind of heat treatment method to timber.

Background technology

Timber is the complicated natural organic substance of porous that a kind of three major polymers: cellulose, hemicellulose and lignin form; Contain a large amount of hydroxyls and methylol etc. in the timber molecule containing the oxygen polar group, thus have that hygroscopicity is strong, the characteristics of dimensional stability, inflammable, apt to rot and easy chemistry degraded.

These characteristics for timber, existing treating of wood and modification technology comprise: vacuum high-pressure impregnates fire resistant fluid, vacuum drying, anticorrosion, carbonization etc., but there are or several performances can only improving timber in these technology, can not improve wood performance, and occupation area of equipment yields poorly greatly, the energy consumption high comprehensively; Such as: utilize Minton dryer to carry out modification, one-period just needs 7～15 days, and these technology can not be corrected timber simultaneously, are unfavorable for the resources conservation utilization.

Summary of the invention

Therefore, for above-mentioned situation, can not improve wood performance for solving in existing treating of wood comprehensively, the treatment facility floor space is large, the problem that energy consumption is high and the cycle is long, the present invention relates to a kind of timberphysics method of modifying, fire retardant is impregnated in employing, high temperature, high pressure carries out drying, correct, physical method qualitatively, in the vision that does not change timber, on the basis of sense of touch fundamental characteristics, direct fresh fast-growing and high-yielding plantation forest sawn timber and other Broad leaves sawn timber higher to moisture content, Coniferous sawn timber directly carries out physical modification, mechanical property and processing performance to timber are changed.

The technical scheme of its solution is, by moisture content, higher fresh fast-growing and high-yielding plantation forest and other broad leaf trees, coniferous tree jagsaw are cut into the specification needed;

By inorganic resin type wood fire retardant melamine phosphate or the acid of organic wood fire retardant dicyandiamidines microcosmic salt

Be uniformly mixed in container with water, make the wood fire retardant aqueous solution;

Sawn timber is placed in to the non-pressure vessel that fills the wood fire retardant aqueous solution and soaks, or sawn timber is placed in to GB150-1998 adopts the mode of pressurizeing after first vacuum to impregnate fire retardant;

The sawn timber impregnated enters in one or more layers planar high voltage vulcanization plant, under certain hour, temperature, pressure condition, softens and dry;

Sawn timber, after completing softening and drying, continues in one or more layers planar high voltage vulcanization plant, under certain hour, temperature, pressure condition, is corrected, leveling and physical modification, completes the whole processing procedure of timber.

All kinds of sawn timber moisture content after modification are tested at ambient temperature as≤6%; Can improve as required the mechanical property such as density, hardness, intensity of sawn timber; Improved stability and the durability of timber simultaneously, realize to have eliminated that wood internal stress, protection against the tide, moisture absorption lowly, anti-go mouldy, resistance to deformation, cracking resistance, dimensionally stable, material are level and smooth, the effect of de-oiling fat; That sawn timber after modification has concurrently is fire-retardant, anticorrosion, the performance of insulation; Reach comprehensive purpose of improving the timberphysics performance, and have advantages of that output is high, energy consumption is low, production process is pollution-free, floor space is little.

The specific embodiment

Below in conjunction with the specific embodiment, the specific embodiment of the present invention is described in further details.

A kind of timberphysics method of modifying comprises the following steps:

By moisture content, higher fresh fast-growing and high-yielding plantation forest and other broad leaf trees, coniferous tree jagsaw are cut into the specification needed;

Inorganic resin type wood fire retardant melamine phosphate or the acid of organic wood fire retardant dicyandiamidines microcosmic salt are uniformly mixed in container with water, make the wood fire retardant aqueous solution;

Sawn timber, after completing softening and drying, continues in one or more layers planar high voltage vulcanization plant, under certain hour, temperature, pressure condition, is corrected, leveling and physical modification, completes whole processing procedure.

Said inorganic resin type wood fire retardant or organic wood fire retardant mix by weight 1: 6～1:4 proportioning with water.

Said sawn timber impregnates fire retardant and is placed in one or more layers planar high voltage vulcanization plant, 180 ℃～200 ℃ of temperature, time chien shih timber according to 30s/mm (sawn timber of every millimeter needs 30 seconds, according to the thickness setting time) under the condition of pressure 0.1～0.5Mpa is first softening and dry; Sawn timber is under high-temperature low-pressure is adjusted, at first softening, secondly the drying of wood makes fire retardant solidify, not run off simultaneously, realize fire-retarding of wood, anticorrosion, the purpose that eliminates smoke, eliminated the bacterium in the sawn timber, worm, termite, longicorn etc. simultaneously when realizing the good flame retardancy and smoke suppression of timber.

After said timber completes softening and drying in one or more layers planar high voltage vulcanization plant, continuation is in one or more layers planar high voltage vulcanization plant, 200 ℃ of temperature～≤ 10 ℃ of timber burning-points, under the condition of pressure 1.0～1.5Mpa, according to the time chien shih timber of 30s/mm, complete corrected, leveling and physical modification; The degraded of the sawn timber hemicellulose that moisture pick-up properties is strong under the high-temperature low-pressure condition produces the materials such as furfural, hydrogen bond between timber molecule and hydrone is reduced, the concentration of timber hydroxyl and the ability exchanged with extraneous hydrone have been reduced simultaneously, changed the water adsorption mechanism of timber, moisture absorption, water absorbing properties descend.

Said one or more layers planar high voltage vulcanization plant adopts the heating of Φ 14mm carborundum Far-infrared ray radiation heating pipe, and the heating of carborundum Far-infrared ray radiation heating pipe is transversely arranged in flat (steel) plate preformed hole with the spacing of 100mm.

Saidly sawn timber is placed in to GB150-1998 adopts the method for the mode of pressurizeing after first vacuum to be: be evacuated to 600～650 millimetress of mercury when GB150-1998 impregnates fire retardant, keep 30～60 minutes; Rely on vacuum that wood fire retardant is imported in GB150-1998, remove vacuum when wood fire retardant is full of pressure vessel, close vacuum valve; Slowly be pressurized to 1.2～1.4MPa, and keep 2～4 hours; Reach the fire retardant amount of impregnating and be timber weight 10%～15% the time pressure relief, discharge medicament, close pressurizing valve and the valve that is connected the wood fire retardant holding vessel; Be evacuated to 600～650 millimetress of mercury, keep 10～15 minutes, remove vacuum, take out sawn timber.

The present invention has overcome because moisture changes that the horizontal stroke cause is curved, easement, crosswise concaving, distortion, the phenomenon such as ftracture, go mouldy, synchronously realize the de-oiling degreasing under the high temperature adjustment and destroyed the nutritional labeling of timber, block the food chain of harmful mushroom, thereby guaranteed stability and the weatherability of sawn timber; Sawn timber after modification does not reduce the timber insulating properties, does not reduce mechanical strength, but prolonging wood using life 5-10 doubly; When obtaining above performance, retained the natural quality of original heat insulation, the insulation of timber, temperature adjustment, damping; Improved surface and machined surface exquisiteness, smoothness, more easily dig, bore, cut, the saw face is level and smooth; Can adjust as required pressure and time change density of wood under high temperature, condition of high voltage, improve strength of wood; Change wood color can adjust as required pressure and time under high temperature, condition of high voltage, hide and originally go mouldy, blue change and aberration, reach solid colour.

Claims

1. a timberphysics method of modifying comprises the following steps:

By moisture content, higher fresh fast-growing and high-yielding plantation forest and other broad leaf trees, coniferous tree jagsaw are cut into the specification needed; Inorganic resin type wood fire retardant melamine phosphate or the acid of organic wood fire retardant dicyandiamidines microcosmic salt are uniformly mixed in container with water, make the wood fire retardant aqueous solution;

2. a kind of timberphysics method of modifying according to claim 1, is characterized in that, inorganic resin type wood fire retardant or organic wood fire retardant mix by weight 1:6～1:4 proportioning with water.

3. a kind of timberphysics method of modifying according to claim 1, it is characterized in that: sawn timber impregnates fire retardant and is placed in one or more layers planar high voltage vulcanization plant, 180 ℃～200 ℃ of temperature, the time chien shih timber according to 30s/mm under the condition of pressure 0.1～0.5Mpa is first softening and dry.

4. a kind of timberphysics method of modifying according to claim 1, it is characterized in that, after timber completes softening and drying in one or more layers planar high voltage vulcanization plant, continuation is in one or more layers planar high voltage vulcanization plant, 200 ℃ of temperature～≤ 10 ℃ of timber burning-points, under the condition of pressure 1.0～1.5Mpa, according to the time chien shih timber of 30s/mm, complete corrected, leveling and physical modification.