阅读说明：本技术 一种速生材改性设备及改性方法 (Fast growing wood modification equipment and modification method ) 是由 龚小梅 王康 张秀芳 梁晓伟 吴宗旺 曹宏 于 2020-10-10 设计创作，主要内容包括：本发明公开一种速生材改性设备,包括罐体、密封罐门、储液罐、真空泵,密封罐门与罐体可拆卸连接,密封罐门与罐体密封相连,罐体内能够容纳待处理木材,储液罐内能够容纳浸渍液,储液罐、真空泵均与罐体相连通,储液罐能够向罐体内输送浸渍液,罐体内设置加热器和加压组件,加压组件能够压缩待处理木材。本发明还公开了一种速生材改性方法,采用压缩结合真空加压工艺对速生材改性,解决了传统速生材浸渍前必须干燥的问题,一方面简化了流程,而且节约能量,降低成本,更适合于工业化生产。另外一方面提高浸渍效果,使改性的木材具有浸渍效果好,强度高,尺寸稳定好、强耐腐性、防水性好等性能。(The invention discloses fast growing wood modification equipment which comprises a tank body, a sealing tank door, a liquid storage tank and a vacuum pump, wherein the sealing tank door is detachably connected with the tank body, the sealing tank door is connected with the tank body in a sealing mode, wood to be treated can be contained in the tank body, impregnating liquid can be contained in the liquid storage tank, the liquid storage tank and the vacuum pump are both communicated with the tank body, the liquid storage tank can convey the impregnating liquid into the tank body, a heater and a pressurizing assembly are arranged in the tank body, and the pressurizing assembly can compress the wood to be treated. The invention also discloses a method for modifying the fast growing wood, which adopts the compression and vacuum pressurization process to modify the fast growing wood, solves the problem that the traditional fast growing wood needs to be dried before impregnation, simplifies the flow, saves energy, reduces the cost and is more suitable for industrial production. On the other hand, the impregnation effect is improved, so that the modified wood has the performances of good impregnation effect, high strength, good size stability, strong corrosion resistance, good waterproofness and the like.)

1. A fast growing wood modification equipment which is characterized in that: including a jar body, sealed tank door, liquid storage pot, vacuum pump, sealed tank door with the connection can be dismantled to the jar body, sealed tank door with jar body is sealed continuous, can hold pending timber in the jar body, can hold the flooding liquid in the liquid storage pot, the liquid storage pot the vacuum pump all with the jar body is linked together, the liquid storage pot can to jar internal transport flooding liquid, jar internal heater and the pressure components of setting up, the pressure components can compress pending timber.

2. The fast growing wood modifying apparatus of claim 1, wherein: the pressurizing assembly comprises a pressing rod and a pressing plate, the pressing rod is slidably connected with the tank body, the pressing rod is connected with the pressing plate, the pressing rod can drive the pressing plate to reciprocate, and the pressing plate can compress wood to be treated.

3. The fast growing wood modifying apparatus of claim 2, wherein: the pressurizing assembly further comprises an upper top plate, an upright post and a lower bottom plate, the upper top plate and the lower bottom plate are respectively arranged on two opposite sides in the tank body, and the upright post is connected with the upper top plate and the lower bottom plate; the compression bar is slidably connected with the upper top plate.

4. The fast growing wood modifying apparatus of claim 2, wherein: the number of the pressure rods is two, the two pressure rods are respectively arranged at two opposite ends of the pressure plate, and the pressure rods can drive the pressure plate to reciprocate along the vertical direction; the pressurizing assembly is provided with a control switch and a driver, the driver is in transmission connection with the pressure rod, and the control switch can control the working state of the driver.

5. The fast growing wood modifying apparatus of claim 1, wherein: the tank body is provided with an air extraction opening, and the vacuum pump is communicated with the tank body by utilizing the air extraction opening; the liquid storage tank is communicated with the tank body through a liquid inlet pipe and a liquid outlet pipe, a liquid inlet check valve is arranged on the liquid inlet pipe, the liquid inlet pipe is communicated with the bottom of the inner cavity of the liquid storage tank, a liquid outlet check valve is arranged on the liquid outlet pipe, and the liquid outlet pipe is communicated with the top of the inner cavity of the liquid storage tank; the tank body is further provided with a pressure gauge and a thermometer, and the tank body is provided with a safety valve and an overflow port.

6. The fast growing wood modifying apparatus of claim 1, wherein: the quantity of sealed tank door is two, two sealed tank door set up respectively in the relative both ends of jar body.

7. The fast growing wood modifying apparatus of claim 1, wherein: the sealing tank door is provided with a first tooth-shaped structure, the tank body is provided with a second tooth-shaped structure matched with the first tooth-shaped structure, the first tooth-shaped structure is meshed with the second tooth-shaped structure, and a sealing gasket is arranged between the sealing tank door and the tank body.

8. The fast growing wood modifying apparatus of claim 1, wherein: the tank body is internally provided with a trolley track, the trolley track is detachably connected with the tank body, and the trolley track and the pressurizing assembly are arranged on two opposite sides in the tank body.

9. A method for modifying fast growing wood by using the fast growing wood modification apparatus of any one of claims 1 to 8, comprising the steps of:

step one, early preparation

After wood is treated, the wood is sent into the tank body, and the door of the sealed tank is closed;

step two, compressing the wood

The compression assembly is used for compressing the wood, and the compression rate of the wood is related to the material quality;

step three, vacuum pressure impregnation

Regulating the pressure in the tank body to-0.09-0.1 MPa by using a vacuum pump, keeping the pressure for 20-45min, allowing the impregnation liquid in the liquid storage tank to enter the tank body, and stopping adding liquid when the liquid level of the impregnation liquid exceeds the surface of the wood; adjusting pressure to 0.5-0.8MPa, soaking at 20-70 deg.C for 30-90min, and releasing pressure; in the impregnation process, the liquid level of the impregnation liquid is ensured to be higher than the surface of the wood all the time; after pressure relief, refluxing the impregnation liquid in the tank body to a liquid storage tank, vacuumizing the tank body to 0.08-0.085MPa, keeping for 5-10min to immerse the impregnation liquid on the surface of the wood into the wood, and then relieving pressure again;

step four, discharging

Releasing pressure, opening a sealed tank door, discharging, washing the surface of the wood, placing the wood in a shade place for standing, and aging for 4-8 d;

step five, thermal curing

The wood is put into a high-temperature treatment kiln, the temperature is 160-200 ℃, the constant temperature treatment is carried out for 4-6h, and then the temperature is reduced and the wood is cooled.

10. The method for modifying fast growing wood according to claim 9, wherein: in the second step, the compression rate of the wood is 15% -60%; in the third step, the liquid level of the impregnation liquid is always higher than the surface of the wood by 3-5 cm.

Technical Field

The invention relates to the technical field of wood modification, in particular to fast growing wood modification equipment and a modification method.

Background

With the increasing shortage of forest resources worldwide, especially the increasingly sharp decrease in the amount of precious wood, a large number of fast-growing tree species are widely planted to meet the worldwide demand for wood supply. China is a big wood consuming country, but because China implements natural forest protection measures in China this year, artificial fast-growing forest trees are widely planted in China. The fast-growing forest is subjected to physical or chemical modification treatment, so that the economic added value of the fast-growing forest is improved, and the aim of protecting precious tree species resources is fulfilled.

Most of the wood modification in the market at present adopts acetylation treatment and impregnation of unsaturated polyester resin (such as phenolic resin, urea resin, melamine resin and the like) to reduce dry shrinkage and wet swelling and simultaneously improve the density and mechanical strength of wood. However, the impregnation methods adopted at present all require a drying pretreatment of the wood. Chinese patent publication No. CN104589440A discloses a process for preparing a modified fast-growing wood material for wood building structures, which integrates flame retardant and corrosion protection functions, and specifically discloses a vacuum pressure impregnation method for modifying a fast-growing wood material, but also mentions that the moisture content of the fast-growing wood material must be adjusted. Chinese patent with publication number CN 10556578 discloses a modified impregnant for fast growing wood and an impregnation high-temperature integrated treatment method, and particularly discloses a conventional urea-formaldehyde resin impregnant and a nano material for modifying the fast growing wood, wherein the fast growing wood is dried to have the water content of 8-12% and then is impregnated. Chinese patent publication No. CN107972144A discloses a method for modifying wood by alkali lignin complex heat treatment, specifically a modifier of alkali lignin and a heat treatment process, which requires wood to be dried in advance, and the effect is not ideal.

Therefore, how to change the current situation that the modification of the fast growing wood in the prior art has high requirements on the water content of the fast growing wood and poor modification effect becomes a problem to be solved urgently by the technical personnel in the field.

Disclosure of Invention

The invention aims to provide fast growing wood modification equipment and a modification method, which are used for solving the problems in the prior art, simplifying the fast growing wood modification process and improving the wood impregnation effect.

In order to achieve the purpose, the invention provides the following scheme: the invention provides fast growing wood modification equipment which comprises a tank body, a sealing tank door, a liquid storage tank and a vacuum pump, wherein the sealing tank door is detachably connected with the tank body, the sealing tank door is connected with the tank body in a sealing mode, wood to be treated can be contained in the tank body, impregnating liquid can be contained in the liquid storage tank, the liquid storage tank and the vacuum pump are communicated with the tank body, the liquid storage tank can convey the impregnating liquid into the tank body, a heater and a pressurizing assembly are arranged in the tank body, and the pressurizing assembly can compress the wood to be treated.

Preferably, the pressurizing assembly comprises a pressure rod and a pressure plate, the pressure rod is slidably connected with the tank body, the pressure rod is connected with the pressure plate, the pressure rod can drive the pressure plate to reciprocate, and the pressure plate can compress the wood to be treated.

Preferably, the pressurizing assembly further comprises an upper top plate, a column and a lower bottom plate, the upper top plate and the lower bottom plate are respectively arranged on two opposite sides in the tank body, and the column is connected with the upper top plate and the lower bottom plate; the compression bar is slidably connected with the upper top plate.

Preferably, the number of the pressure rods is two, the two pressure rods are respectively arranged at two opposite ends of the pressure plate, and the pressure rods can drive the pressure plate to reciprocate along the vertical direction; the pressurizing assembly is provided with a control switch and a driver, the driver is in transmission connection with the pressure rod, and the control switch can control the working state of the driver.

Preferably, the tank body is provided with an air extraction opening, and the vacuum pump is communicated with the tank body through the air extraction opening; the liquid storage tank is communicated with the tank body through a liquid inlet pipe and a liquid outlet pipe, a liquid inlet check valve is arranged on the liquid inlet pipe, the liquid inlet pipe is communicated with the bottom of the inner cavity of the liquid storage tank, a liquid outlet check valve is arranged on the liquid outlet pipe, and the liquid outlet pipe is communicated with the top of the inner cavity of the liquid storage tank; the tank body is further provided with a pressure gauge and a thermometer, and the tank body is provided with a safety valve and an overflow port.

Preferably, the number of the sealing tank doors is two, and the two sealing tank doors are respectively arranged at two opposite ends of the tank body.

Preferably, the sealing tank door is provided with a first tooth-shaped structure, the tank body is provided with a second tooth-shaped structure matched with the first tooth-shaped structure, the first tooth-shaped structure is meshed with the second tooth-shaped structure, and a sealing gasket is arranged between the sealing tank door and the tank body.

Preferably, set up the shallow track in jar body, the shallow track with jar body detachable connections, the shallow track with pressure components sets up in jar internal relative both sides.

A fast growing wood modification method utilizes the fast growing wood modification equipment, and comprises the following steps:

step one, early preparation

After wood is treated, the wood is sent into the tank body, and the door of the sealed tank is closed;

step two, compressing the wood

The compression assembly is used for compressing the wood, and the compression rate of the wood is related to the material quality;

step three, vacuum pressure impregnation

Regulating the pressure in the tank body to-0.09-0.1 MPa by using a vacuum pump, keeping the pressure for 20-45min, allowing the impregnation liquid in the liquid storage tank to enter the tank body, and stopping adding liquid when the liquid level of the impregnation liquid exceeds the surface of the wood; adjusting pressure to 0.5-0.8MPa, soaking at 20-70 deg.C for 30-90min, and releasing pressure; in the impregnation process, the liquid level of the impregnation liquid is ensured to be higher than the surface of the wood all the time; after pressure relief, refluxing the impregnation liquid in the tank body to a liquid storage tank, vacuumizing the tank body to 0.08-0.085MPa, keeping for 5-10min to immerse the impregnation liquid on the surface of the wood into the wood, and then relieving pressure again;

step four, discharging

Releasing pressure, opening a sealed tank door, discharging, washing the surface of the wood, placing the wood in a shade place for standing, and aging for 4-8 d;

step five, thermal curing

The wood is put into a high-temperature treatment kiln, the temperature is 160-200 ℃, the constant temperature treatment is carried out for 4-6h, and then the temperature is reduced and the wood is cooled.

Preferably, in the second step, the compression rate of the wood is 15% -60%; in the third step, the liquid level of the impregnation liquid is always higher than the surface of the wood by 3-5 cm.

Compared with the prior art, the invention has the following technical effects: the invention discloses fast growing wood modification equipment which comprises a tank body, a sealing tank door, a liquid storage tank and a vacuum pump, wherein the sealing tank door is detachably connected with the tank body, the sealing tank door is connected with the tank body in a sealing mode, wood to be treated can be contained in the tank body, impregnating liquid can be contained in the liquid storage tank, the liquid storage tank and the vacuum pump are both communicated with the tank body, the liquid storage tank can convey the impregnating liquid into the tank body, a heater and a pressurizing assembly are arranged in the tank body, and the pressurizing assembly can compress the wood to be treated. The invention also discloses a method for modifying the fast growing wood, which adopts the compression and vacuum pressurization process to modify the fast growing wood, solves the problem that the traditional fast growing wood needs to be dried before impregnation, simplifies the flow, saves energy, reduces the cost and is more suitable for industrial production. On the other hand, the impregnation effect is improved, so that the modified wood has the performances of good impregnation effect, high strength, good size stability, strong corrosion resistance, good waterproofness and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a fast growing wood modification apparatus of the present invention;

FIG. 2 is a schematic structural view of a sealing tank door of the fast growing wood modification apparatus of the present invention;

FIG. 3 is a flow chart of a method of modifying fast growing wood in accordance with the present invention;

the device comprises a tank body 1, a sealing tank door 2, a liquid storage tank 3, a vacuum pump 4, a heater 5, a pressure rod 6, a pressure plate 7, an upper top plate 8, a vertical column 9, a lower bottom plate 10, an air suction port 11, a liquid inlet pipe 12, a liquid inlet check valve 13, a liquid outlet pipe 14, a liquid outlet check valve 15, a first tooth-shaped structure 16, a pressure gauge 17, a thermometer 18, a safety valve 19 and an overflow port 20.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide fast growing wood modification equipment and a modification method, which are used for solving the problems in the prior art, simplifying the fast growing wood modification process and improving the wood impregnation effect.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 1-3, wherein fig. 1 is a schematic structural diagram of a fast growing wood modification apparatus of the present invention, fig. 2 is a schematic structural diagram of a sealing tank door of a fast growing wood modification apparatus of the present invention, and fig. 3 is a flowchart of a fast growing wood modification method of the present invention.

The invention provides fast growing wood modification equipment which comprises a tank body 1, a sealing tank door 2, a liquid storage tank 3 and a vacuum pump 4, wherein the sealing tank door 2 is detachably connected with the tank body 1, the sealing tank door 2 is connected with the tank body 1 in a sealing mode, wood to be treated can be contained in the tank body 1, impregnating liquid can be contained in the liquid storage tank 3, the liquid storage tank 3 and the vacuum pump 4 are communicated with the tank body 1, the impregnating liquid can be conveyed into the tank body 1 from the liquid storage tank 3, a heater 5 and a pressurizing assembly are arranged in the tank body 1, and the pressurizing assembly can compress the wood to be treated.

When the fast growing wood modification equipment is used, wood to be treated can be contained in the tank body 1, when the sealing tank door 2 is closed, the sealing tank door 2 is in sealing connection with the tank body 1, the air tightness in the tank body 1 is guaranteed, the liquid storage tank 3 can convey impregnation liquid into the tank body 1, the requirement of an impregnation process is met, the tank body 1 is internally provided with the heater 5 and the pressurizing assembly, the heater 5 can heat the impregnation liquid, and the pressurizing assembly can compress the wood to be treated.

Specifically, the pressurizing assembly comprises a pressing rod 6 and a pressing plate 7, the pressing rod 6 is connected with the tank body 1 in a sliding mode, the pressing rod 6 is connected with the pressing plate 7, the pressing rod 6 can drive the pressing plate 7 to reciprocate, the pressing plate 7 can compress wood to be treated, the pressing rod 6 drives the pressing plate 7 to move and utilizes the pressing plate 7 to compress the wood to be treated, and convenience is brought to subsequent wood impregnation.

In order to ensure the overall structural strength of the pressurizing assembly, the pressurizing assembly further comprises an upper top plate 8, an upright post 9 and a lower bottom plate 10, wherein the upper top plate 8 and the lower bottom plate 10 are respectively arranged at two opposite sides in the tank body 1, and the upright post 9 is connected with the upper top plate 8 and the lower bottom plate 10; the compression bar 6 is connected with the upper top plate 8 in a sliding mode, the upper top plate 8, the upright posts 9 and the lower bottom plate 10 are arranged to form a frame-shaped structure, stable support is provided for movement of the compression bar 6 and the compression plate 7, and structural strength and stability of the compression assembly are improved.

Wherein, depression bar 6's quantity is two, and two depression bars 6 set up respectively in the relative both ends of clamp plate 7, and depression bar 6 can drive clamp plate 7 along vertical direction reciprocating motion, improves clamp plate 7's atress homogeneity, adopts clamp plate 7 to compress timber, and increase clamp plate 7 meets with timber contact surface, improves timber pressurized homogeneity. In order to facilitate control, the pressurizing assembly is provided with a control switch and a driver, the driver is in transmission connection with the pressure rod 6, the control switch can control the working state of the driver, and it should be noted that the pressurizing assembly is also connected with a protection element to effectively protect a control circuit and ensure that the pressurizing assembly can normally work.

More specifically, the tank body 1 is provided with an air extraction opening 11, the vacuum pump 4 is communicated with the tank body 1 through the air extraction opening 11, the vacuum pump 4 is communicated with the air extraction opening 11 through a pipeline, and the vacuum pump 4 extracts air in the tank body 1 through the air extraction opening 11 to control the pressure in the tank body 1. The liquid storage tank 3 is communicated with the tank body 1 through a liquid inlet pipe 12 and a liquid outlet pipe 14, the liquid inlet pipe 12 is provided with a liquid inlet check valve 13, the liquid inlet pipe 12 is communicated with the bottom of the inner cavity of the liquid storage tank 3, the liquid outlet check valve 15 is arranged on the liquid outlet pipe 14, the liquid outlet pipe 14 is communicated with the top of the inner cavity of the liquid storage tank 3, the impregnating solution can be recycled, and the liquid outlet check valve 15 and the liquid inlet check valve 13 are arranged to facilitate control of the flow direction of the impregnating solution. The tank body 1 is also provided with a pressure gauge 17 and a thermometer 18, so that the pressure and the temperature in the tank body 1 can be conveniently monitored, and the tank body 1 is provided with a safety valve 19 and an overflow port 20, so that the safety factor of the operation of the tank body 1 is improved.

In this embodiment, the number of the sealing tank doors 2 is two, and the two sealing tank doors 2 are respectively arranged at two opposite ends of the tank body 1, so as to facilitate the entering and exiting of wood to be treated.

In order to improve the connection sealing performance of the sealing tank door 2 and the tank body 1, the sealing tank door 2 is provided with a first tooth-shaped structure 16, the tank body 1 is provided with a second tooth-shaped structure matched with the first tooth-shaped structure 16, the first tooth-shaped structure 16 is meshed with the second tooth-shaped structure, a sealing gasket is arranged between the sealing tank door 2 and the tank body 1, and the safety coefficient of the operation of the equipment is further improved.

Further, set up the shallow track in jar body 1, shallow track and jar body 1 detachable connections, shallow track and pressure components set up in jar body 1 relative both sides, set up the shallow track and can conveniently will be equipped with ligneous shallow and send into jar body 1 in, convenient operation alleviates operating personnel's work burden, in addition, shallow track and jar body 1 detachable connections, make things convenient for jar body 1 to maintain clean after the shallow track is dismantled.

The invention also provides a fast growing wood modification method, which utilizes the fast growing wood modification equipment and comprises the following steps:

step one, early preparation

After wood is treated, the wood is sent into the tank body 1, and the sealing tank door 2 is closed;

step two, compressing the wood

The compression assembly is used for compressing the wood, and the compression rate of the wood is related to the material quality;

step three, vacuum pressure impregnation

Regulating the pressure in the tank body 1 to-0.09-0.1 MPa by using a vacuum pump 4, keeping the pressure for 20-45min, allowing the impregnation liquid in the liquid storage tank 3 to enter the tank body 1, and stopping adding liquid when the liquid level of the impregnation liquid exceeds the surface of the wood; adjusting pressure to 0.5-0.8MPa, soaking at 20-70 deg.C for 30-90min, and releasing pressure; in the impregnation process, the liquid level of the impregnation liquid is ensured to be higher than the surface of the wood all the time; after pressure relief, the impregnation liquid in the tank body 1 flows back to the liquid storage tank 3, the tank body 1 is vacuumized to 0.08-0.085MPa and kept for 5-10min, so that the impregnation liquid on the surface of the wood is impregnated into the wood, and then pressure relief is carried out again;

step four, discharging

After pressure relief is finished, opening the sealing tank door 2, discharging, washing the surface of the wood, placing the wood in a shade place for standing, and aging for 4-8 d;

step five, thermal curing

The wood is put into a high-temperature treatment kiln, the temperature is 160-200 ℃, the constant temperature treatment is carried out for 4-6h, and then the temperature is reduced and the wood is cooled.

In the second step, the compression rate of the wood is 15-60%, the specific compression rate is specifically determined according to the material of the wood, and the wood can be selected from one or more of fast-growing poplar, eucalyptus, fir or pine; in the third step, the liquid level of the impregnation liquid is always higher than the surface of the wood by 3-5 cm.

The method for modifying a fast growing wood of the present invention will be further explained by specific examples.

Example 1

The fast growing wood modifying method comprises the following steps:

step one, early preparation: the preliminary preparation includes equipment inspection. The poplar is pre-treated by sawing, trimming, planing and the like, and the sawing is 1500 multiplied by 200 multiplied by 30 (mm)³) The test piece of (1).

Step two, compressing wood: the compression ratio was 50%.

Step three, vacuum pressurization dipping: regulating vacuum degree to-0.09 MPa, and maintaining for 30 min. And (3) under the condition of negative pressure, opening the liquid inlet check valve 13, controlling the liquid level of the impregnation liquid to exceed 3cm of the wood, and stopping adding liquid. In the dipping process, when the liquid level is lower than the height of the wood, liquid is automatically added. Regulating pressure to 0.6Mpa, soaking at 55 deg.C for 30 min. Releasing the pressure, opening the liquid outlet check valve 15, and refluxing the impregnation liquid to the liquid storage tank 3. Vacuumizing again at 0.085MPa for 5min, and then releasing the pressure. In the dipping process, when the liquid level is lower than the height of the wood, liquid is automatically added.

Step four, discharging: and (5) after pressure relief is finished, opening the sealing tank door 2 and discharging. Simply washing the surface, standing in shade for health promotion, and aging for 5 days.

Step five, thermocuring: placing into a high-temperature treatment kiln, treating at 160 deg.C for 4 hr, and slowly cooling.

Example 2

The fast growing wood modifying method comprises the following steps:

step one, early preparation: the preliminary preparation includes equipment inspection. The fir wood is pre-treated by sawing, trimming and planing to obtain cut wood of 2000 × 100 × 30 (mm)³) The test piece of (1).

Step two, compressing wood: the compressibility was 60%.

Step three, vacuum pressurization dipping: regulating vacuum degree to-0.09 MPa, and maintaining for 40 min. And (3) under the condition of negative pressure, opening the liquid inlet check valve 13, controlling the liquid level of the impregnation liquid to exceed 3cm of the wood, and stopping adding liquid. In the dipping process, when the liquid level is lower than the height of the wood, liquid is automatically added. Adjusting pressure to 0.7Mpa, soaking at 50 deg.C for 45 min. Releasing the pressure, opening the liquid outlet check valve 15, and refluxing the impregnation liquid to the liquid storage tank 3. Vacuumizing again at 0.085MPa for 5min, and then releasing the pressure. In the dipping process, when the liquid level is lower than the height of the wood, liquid is automatically added.

Step four, discharging: and (5) after pressure relief is finished, opening the sealing tank door 2 and discharging. Simply washing the surface, standing in shade for health promotion, and aging for 5 days.

Step five, thermocuring: placing into a high-temperature treatment kiln, keeping the temperature at 170 ℃, treating for 5 hours at constant temperature, and then slowly cooling.

Example 3

The procedure of example 1 was followed except that in step five, the thermosetting temperature was 180 ℃ and the constant temperature treatment was carried out for 4 hours, and the other steps were identical.

Comparative example 1

The procedure of example 1 was followed except that the second step of compressing the wood was not performed, and conventional drying treatment was performed to dry the wood to a water content of 12%.

Comparative example 2

The procedure of example 2 was followed except that the second step of compressing the wood was not performed, and conventional drying treatment was performed to dry the wood to a moisture content of 13%.

Comparative example 1

Example 1 Populus wood Material

Comparative example 2

Example 2 China fir materials

Wood performance test indexes and methods:

the impregnation effect is as follows:

the weight gain rate is: the ratio of the mass increase before and after dipping of the test piece to the mass before dipping.

The formula is as follows:

in the formula: w-weight gain,%;

m 0-weight of test piece before treatment, g;

m 1-weight of test piece after treatment, g;

② dimensional stability:

reference GB-T17657-1999 artificial board and decorative artificial board physical and chemical performance test method

Water absorption thickness expansion rate for 24 h: immersing the test piece in a water tank with the water temperature of 20 +/-2 ℃ and the pH value of 7 +/-1, keeping a certain gap between the surface of the test piece and the bottom of the water tank, keeping a certain distance between the test piece and the test piece, soaking the test piece for 24 hours, and measuring the thickness of a measuring point within 30 minutes.

The formula is as follows:

in the formula: T-Water absorption thickness expansion,%;

h 1-thickness of the test piece before immersion, mm;

h 2-thickness of the test piece after immersion, mm;

(iii) mechanical Strength

Bending strength reference GB/T1936.1-2009 wood bending strength test method

The radial dimension measured at the center of the length of the specimen is the width, and the chord direction is the height, and the accuracy is 0.1 mm. The sample is destroyed within 1-2min by central loading. The above properties were all tested using an electronic universal tester, and the results were the average of 3 tests.

Bending elastic modulus reference GB/T1936.2-2009 wood bending elastic modulus test method

The radial dimension measured in the length direction of the sample is the width, and the chord direction is the height, and the accuracy is 0.1 mm. By adopting a two-point loading method, the tester loads to the lower limit load at a constant speed, immediately reads the indicated value of the dial indicator, loads to the upper limit load after 15-20 s, unloads immediately, and repeats the process for three times.

The formula:

EW-flexural modulus of elasticity in units of megapascals (MPa) at a test moisture content of W;

p-difference between upper and lower limit loads, in units of cattle (N);

l-the span between two supports, in millimeters (mm);

b-sample width in millimeters (mm);

h-sample height in millimeters (mm);

f-the sample deflection between the upper and lower limit loads in millimeters (mm).

Waterproof performance:

water absorption: the mass difference of the test piece before and after soaking and the mass ratio of the test piece before and after soaking.

The results of the performance testing of the above examples are shown in table 1 below:

as a result of the results shown in table 1, the weight gain of examples 1, 2 and 3 was significantly higher than that of comparative examples and comparative examples, compared with those of comparative examples 1 and 2 in which wood was not treated, indicating that compression before vacuum pressure impregnation was advantageous for penetration of the impregnant into the interior of wood. Compared with comparative examples 1 and 2, the impregnation effect of the examples is obviously better than that of the comparative examples.

Compared with untreated wood comparative examples 1 and 2, the 24-hour water absorption thickness expansion rate of examples 1, 2 and 3 is obviously reduced, which shows that the wood stability is obviously enhanced through the modification of the process. The water absorption thickness expansion rate of the example is lower than that of the comparative examples 1 and 2.

Compared with the comparative examples, the bending strength and the bending elasticity modulus of the examples 1, 2 and 3 are obviously improved, which shows that the process can improve the mechanical strength of the wood and meet the production requirement.

The quality loss rate of the examples 1, 2 and 3 is between 6.5 and 8.6 percent, and according to the evaluation standard of the natural decay resistance grade of the wood, the decay resistance grade is divided into four grades according to the quality homeopathic rate: strong corrosion resistance (0-10%), corrosion resistance (11-24%), slight corrosion resistance (25-44%), non-corrosion resistance (> 45%), and it can be seen that the wood treated by the process is strong corrosion resistance material.

Table 2 shows the water absorption of the above experimental groups.

The results show that the water absorption rate of the fast growing wood treated by the process is obviously reduced in examples 1, 2 and 3 compared with comparative examples 1 and 2, and the waterproof effect of the fast growing wood treated by the process is enhanced. Compared with comparative examples 1 and 2, the process has better waterproof effect than the traditional drying pretreatment mode.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.