CN112497398A

CN112497398A - Wood heat treatment, wax injection and dewaxing integrated modification process and equipment

Info

Publication number: CN112497398A
Application number: CN202011353095.7A
Authority: CN
Inventors: 王雪花; 朱骏杰; 曹明鑫; 马静文
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-03-16

Abstract

The invention discloses a wood heat treatment, wax injection and dewaxing integrated modification process and equipment, wherein the modification process comprises the following steps: a. the dried wood is orderly stacked in a treatment tank and separated by a parting bead; b. vacuumizing the treatment tank and maintaining for a period of time; c. heating the treatment tank to a certain temperature; d. putting solid wax into a liquid storage tank and heating to melt the solid wax; e. opening a valve for communicating the treatment tank with the liquid storage tank to allow the wax liquid to flow into the treatment tank; f. pressurizing the treatment tank, and carrying out combined treatment of heat and wax injection on the wood; g. releasing the pressure in the treatment tank, and discharging the wax liquid to a liquid storage tank; h. and (4) carrying out secondary vacuum pumping on the treatment tank to remove residual wax liquid on the surface of the wood, and pumping wax vapor back to the liquid storage tank through a pipeline to realize cyclic utilization of the wax liquid. Through the combined treatment of heat treatment, wax injection and dewaxing, the dimensional stability, corrosion resistance, weather resistance and the like of the wood can be effectively improved, and the high-value utilization of the low-quality wood is realized.

Description

Wood heat treatment, wax injection and dewaxing integrated modification process and equipment

Technical Field

The invention relates to an integrated modification process and equipment for wood heat treatment, wax injection and dewaxing, belonging to the technical field of wood modification.

Background

The wood material has natural texture and is a good material for making household products, but has the defects of easy moisture absorption, deformation and the like due to the biological property. In recent years, the consumption demand of geothermal floors is increased, when a geothermal heating system is operated, the floor can be baked at the temperature of more than 40 ℃ for a long time, and when the heating system is closed, the temperature is rapidly reduced, so that in some areas in the south, the geothermal floor is in a humid environment for a long time, and higher requirements are provided for the size stability, heat resistance and moisture resistance of the floor. The heat treatment can effectively improve the dimensional stability of the wood and prevent the wood from cracking and deforming; the surface wax-scalding and wax-injecting process can isolate the wood from water by means of hydrophobic wax, so that the dimensional stability of the wood is improved, but the prior art mainly aims at precious wood, and the wood has limited resources, high price and low popularization rate; and the wax liquid cannot be completely drained only by the gravity of the wax liquid, and the wood surface is easy to remain a large amount after being cooled at room temperature, so that the appearance is influenced. The patent publication No. CN105014761A discloses a wax injection process for wood, which is to process wood after high-temperature heat treatment, the processing temperature is 100-110 ℃ which is a melting temperature suitable for the wax used, the heat treatment is not considered, the heat treatment and the heat treatment are carried out separately, the cyclic utilization of wax liquid can not be realized, the processing procedure, time and labor cost are increased, the purpose of saving production cost can not be achieved, and the problem of difficult injection for partial hardwood materials with complicated cell types and structures is solved because the vacuum and high-pressure injection before the wax injection process for wood is not set. The 110815480a patent discloses a wax injection process for wood, in which the wood is dewaxed by taking it out after cooling and then dewaxed by wiping, which is inefficient. The 105014761B patent discloses a wax injection process for wood, which is not effective in removing floating wax on the surface of wood and has low production efficiency.

Based on the defects of the prior art, the invention of the wax injection treatment process and equipment with high production efficiency is needed.

Disclosure of Invention

1. Solves the technical problem

Aiming at the problems of low production efficiency of a dewaxing process and relatively poor stability of processed wood in the prior art, the invention provides the wood heat treatment, wax injection and dewaxing integrated modification process, so that the wood is subjected to heat treatment, wax injection and dewaxing modification treatment simultaneously in integrated treatment equipment, the modification treatment can simplify the heat treatment process, and can recycle wax liquid, thereby not only improving the size stability of the wood and preventing the wood from cracking and deforming, but also effectively saving the cost and being beneficial to popularization and use.

2. Technical scheme

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the invention provides wood heat treatment, wax injection and dewaxing integrated modification equipment which comprises a liquid storage tank, a treatment tank, a vacuumizing unit and a pressurizing unit, wherein an exhaust valve is arranged on the treatment tank, the pressurizing unit is communicated with the treatment tank and used for pressurizing treatment of the treatment tank, the vacuumizing unit is respectively communicated with the liquid storage tank and the treatment tank through pipelines, heating devices are respectively arranged on the liquid storage tank and the treatment tank, the liquid storage tank is communicated with the treatment tank through a pipeline, and a valve is arranged on the communicating pipeline.

According to the preferable scheme, the vacuumizing unit comprises a vacuumizing valve, a wax liquid recovery pipeline and a vacuum pump, which are arranged on the treatment tank, and the treatment tank, the vacuum pump and the liquid storage tank are communicated through the wax liquid recovery pipeline.

In a preferred scheme, a vacuum buffer tank is arranged between the vacuum pump and the liquid storage tank. A vacuum buffer tank is arranged to buffer pressure and prevent backflow.

Preferably, the pressurizing unit comprises a compressor and a pressurizing pipeline for communicating the compressor with the treatment tank, and a pressurizing valve is arranged on the pressurizing pipeline.

The invention provides a wood heat treatment, wax injection and dewaxing integrated modification process, which comprises the following steps:

a. the dried wood is orderly stacked in a treatment tank and separated by a parting strip so as to be in full contact with a heat source and the wax liquid.

b. The processing tank is sealed, the vacuum pump is started to vacuumize the processing tank, the processing tank is depressurized to a certain pressure, and is maintained for a period of time, so that the air inside the wood, mainly in the cell cavity, is pumped out as far as possible, the obstruction of the air in the cell to the wax infusion liquid is reduced, and the wax liquid is fully contacted and covers the cell wall.

c. Heating the treatment tank and raising the treatment tank to a certain temperature.

d. And heating the solid wax in the liquid storage tank to melt the solid wax into liquid while vacuumizing and heating the treatment tank.

e. After the wax is completely melted, a valve communicated with the liquid storage tank and the treatment tank is opened, and the wax liquid flows into the treatment tank under the action of atmospheric pressure until the wax liquid is over the wood and is filled in the cavity of the treatment tank.

f. And closing the valve between the liquid storage tank and the treatment tank.

g. Pressurizing the treating tank to certain pressure, and simultaneously performing heat treatment and high-pressure wax injection treatment on the wood.

h. Stopping pressurizing, and opening the exhaust valve to reduce the pressure of the treatment tank to the atmospheric pressure.

i. Then a valve communicated with the processing tank and the liquid storage tank is opened, so that the wax liquid completely flows back to the liquid storage tank under the action of self gravity and then the valve is closed.

j. The treatment tank is maintained at a certain temperature to evaporate the residual wax liquid.

k. And opening a recovery pipeline valve, carrying out secondary vacuum pumping on the treatment tank, reducing the pressure of the treatment tank to a certain pressure and maintaining the pressure for a certain time so as to discharge redundant wax liquid on the surface and inside of the wood and avoid overflowing of low-melting-point wax during later-stage product use, reducing wax consumption in the treatment process, and pumping wax steam from the treatment tank into the liquid storage tank through a pipeline, a vacuum pump and a vacuum buffer tank.

And l, stopping heating the treatment tank, and releasing the vacuum state of the treatment tank when the temperature of the treatment tank is reduced to a certain temperature, and discharging.

Preferably, in the step b, according to different properties of the treated wood, the pressure of the treatment tank can be reduced to-0.05 MPa to-0.1 MPa, and the vacuumizing time is not less than 0.5 h.

Preferably, in the step b, the pressure of the treatment tank can be reduced to-0.08 MPa to-0.1 MPa according to different properties of the treated wood.

In the step c, the temperature in the treatment tank is at least 10-30 ℃ higher than the melting point of the wax, so as to ensure that the wax liquid has proper viscosity and reasonable heat treatment temperature, preferably 120-200 ℃.

Preferably, in the step d, the temperature of the liquid storage tank is heated to 20-30 ℃ higher than the melting point of the wax used, so as to ensure that the wax liquid has proper viscosity.

Preferably, in the step g, the pressure of the treatment tank is maintained at 3MPa to 5MPa, the pressure is set according to the property of the wood, and the temperature is not lower than the melting point of the wax used by 10 ℃ to 30 ℃, preferably 120 ℃ to 200 ℃.

Preferably, in the step j, the temperature of the treatment tank is not lower than the melting point of the wax used by 10-30 ℃.

Preferably, in the step k, the pressure of the treatment tank is reduced to-0.05 MPa to-0.1 MPa, and the vacuumizing time is not less than 0.5 h.

Preferably, in the step l, the temperature of the treatment tank is reduced to below 10 ℃ of the melting point of the wax, and the temperature of the tank to be treated is reduced to 50 ℃ below 50 ℃.

3. Advantageous effects

(1) According to the integrated modification equipment, the liquid storage tank, the pressurizing unit, the heating unit and the vacuumizing unit which are communicated with the treatment tank are arranged, so that the wood can be treated in the same equipment through heat treatment and wax injection in a combined manner through simple arrangement, the dimensional stability of the wood is obviously improved, and the cracking and deformation of the wood are prevented; the combined action of different temperatures and wax can make the wood have specific color and luster and surface state, and can raise the strength, aesthetic property and practicability of the wood.

(2) According to the integrated modification equipment, after wax injection is completed, residual wax liquid is evaporated by keeping the temperature in the treatment tank, and wax steam is pumped back into the liquid storage tank through secondary vacuum pumping, so that residual wax liquid on the surface of wood can be removed well, the reasonable weight gain of the wood is achieved, the quality of wood treatment is effectively improved, and the production efficiency is improved; and the cyclic utilization of the wax liquid can be realized, so that the production cost is saved, and the resource utilization rate is improved. By controlling the processing time, temperature, wax liquid type and the like, the method can adapt to different use requirements, realize the imitation of precious wood of low-quality wood and improve the practicability of wood.

(3) The integrated modification method comprises the steps of firstly pre-vacuumizing the treatment tank, depressurizing the treatment tank to a certain pressure, and maintaining for a period of time, so that air in the wood, mainly in a cell cavity, can be effectively pumped out as much as possible, the obstruction of air in the cell to the wax infusion solution is reduced, the wax infusion solution is in full contact with and covers cell walls, the wax infusion effect is guaranteed to be improved as much as possible in the subsequent operation process, and the dimensional stability of the wood is further enhanced.

Drawings

FIG. 1 is a schematic diagram of the construction of the apparatus of the present invention;

in the figure: 1. a treatment tank door; 2. a treatment tank; 3. an exhaust valve; 4. wood; 5. a treatment tank heating device; 6. a vacuum valve; 7. a wax liquid recovery pipeline; 8. a pressurization valve; 9. a compressor; 10. a vacuum pump; 11. a vacuum buffer tank; 12. a liquid storage tank; 13. a liquid storage tank heating device; 14. wax liquid; 15. and (4) a valve.

Detailed Description

The present invention will be described in further detail with reference to the following examples and the accompanying drawings.

It should be noted that the terms "upper", "lower", "left", "right" and "middle" used in the present specification are for the sake of clarity, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

As used herein, the term "about" is used to provide the flexibility and inaccuracy associated with a given term, measure or value. The degree of flexibility for a particular variable can be readily determined by one skilled in the art.

As used herein, at least one of the terms "is intended to be synonymous with one or more of. For example, "at least one of A, B and C" explicitly includes a only, B only, C only, and combinations thereof, respectively.

Concentrations, amounts, and other numerical data may be presented herein in a range format. It is to be understood that such a range format is used merely for convenience and brevity and should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a numerical range of about 1 to about 4.5 should be interpreted to include not only the explicitly recited limit values of 1 to about 4.5, but also include individual numbers (such as 2, 3, 4) and sub-ranges (such as 1 to 3, 2 to 4, etc.). The same principle applies to ranges reciting only one numerical value, such as "less than about 4.5," which should be construed to include all of the aforementioned values and ranges. Moreover, such an interpretation should apply regardless of the breadth of the range or feature being described.

Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims.

Example 1

The invention provides wood heat treatment, wax injection and dewaxing integrated modification equipment, which comprises a liquid storage tank 12, a treatment tank 2, a vacuumizing unit and a pressurizing unit, wherein an exhaust valve is arranged on the treatment tank 2, the pressurizing unit is communicated with the treatment tank 2, the vacuumizing unit is respectively communicated with the liquid storage tank 12 and the treatment tank 2 through pipelines, heating devices are respectively arranged on the liquid storage tank 12 and the treatment tank 2, the liquid storage tank 12 is communicated with the treatment tank 2 through a pipeline, and a valve 15 is arranged on the communicating pipeline of the liquid storage tank 12 and the treatment tank 2.

The vacuumizing unit comprises a vacuumizing valve 6, a wax liquid recovery pipeline 7, a vacuum pump and a vacuum buffer tank 11 which are arranged on the treatment tank 2, and the treatment tank 2, the vacuum pump 10, the vacuum buffer tank 11 and the liquid storage tank 12 are communicated through the wax liquid recovery pipeline 7.

The pressurizing unit comprises a compressor 9 and a pressurizing pipeline which communicates the compressor 9 with the treatment tank 2, and a pressurizing valve 8 is arranged on the pressurizing pipeline.

The heat treatment, wax injection and dewaxing integrated modification treatment process of the rubber wood imitated black walnut for the geothermal floor by utilizing the arrangement comprises the following specific steps:

a. the dried rubber wood sawn timber is stacked in a treatment tank in order, and adjacent rubber wood sawn timber is separated by a spacing bar with the section not larger than 3cm multiplied by 3cm, so that the rubber wood sawn timber can be in full contact with a heat source and the wax liquid.

b. Sealing the treatment tank, starting a vacuum pump to pre-vacuumize the treatment tank, depressurizing the treatment tank to-0.1 MPa, and continuing vacuumizing for a period of not less than 1 h.

c. And (3) closing the treatment tank, and simultaneously opening a heating system of the treatment tank, heating the treatment tank to 150 ℃, wherein the temperature is higher than the melting point of the used wax by 40 ℃, namely the temperature in the treatment tank is at least higher than the melting point of the used wax by 20-30 ℃.

d. Because the working environment temperature of the geothermal floor is higher, the polyethylene wax with the high temperature resistant melting point of about 110 ℃ is selected to modify the rubber wood, the polyethylene wax powder is poured into the liquid storage tank while the processing tank is vacuumized and heated, the heating system of the liquid storage tank is started to 140 ℃, the temperature is 30 ℃ higher than the melting point of the used wax, namely the heating temperature of the liquid storage tank is at least 10-30 ℃ higher than the melting point of the used wax, and the liquid storage tank is melted into liquid.

g. Pressurizing the treatment tank to 4.5MPa, and carrying out heat treatment and high-pressure wax injection treatment for 8 hours, wherein the heating temperature is not lower than the melting point of the wax used by 10-30 ℃, and in the embodiment, the rubber wood is subjected to heat treatment and high-pressure wax injection combined treatment at 150 ℃.

j. The temperature of the treatment tank is not lower than 10-30 ℃ of the melting point of the wax, and the high temperature of 150 ℃ in the treatment tank is maintained in the embodiment, so that the residual wax liquid is evaporated.

k. Opening a valve of a recovery pipeline, carrying out secondary vacuum pumping on the treatment tank, and reducing the pressure of the treatment tank to-0.05 MPa to-0.1 MPa, wherein 0.05MPa is selected in the embodiment; the vacuumizing time is not less than 0.5h, the vacuumizing time is 3h in the embodiment, and the wax steam is pumped back into the liquid storage tank from the treatment tank through the pipeline, the vacuum pump and the vacuum buffer tank.

And l, stopping heating the treatment tank, reducing the temperature of the treatment tank to below 10 ℃ of the melting point of the used wax when the temperature of the treatment tank is reduced, relieving the vacuum state of the treatment tank when the temperature of the treatment tank is reduced to 50 ℃, and discharging.

The modified rubber wood subjected to the integrated treatment of heat treatment, wax injection and dewaxing modification has a neat surface and no obvious wax residue; the color difference delta E of the walnut powder is lower than 0.5 with black walnut and has no obvious color difference with the black walnut.

The swelling property of the modified material of the embodiment is tested according to GB/T1934.2-2009 method for measuring swelling property of wood, the volume swelling rate of the modified material of the embodiment is 1.0%, and the volume swelling rate is lower;

the contact angle of the modified material of the example is tested, and the contact angle of the modified material of the example is tested to be 100 degrees, so that the modified material has good hydrophobicity;

the weight gain of the modified material of this example was tested, which resulted in a 15% weight gain, complete wax impregnation of the wood cells, and a moderate weight gain.

Comparative example 1

Compared with the example 1, the steps of heat treatment, wax injection and dewaxing are removed in the comparative example, and the rubber wood is placed in the treatment tank of the device and is taken out after being placed in vacuum for 12 hours.

The color difference delta E between the modified rubber wood and the black walnut is 7 through testing, and the modified rubber wood has obvious color difference with the black walnut.

The swelling property of the modified material of the embodiment is tested according to GB/T1934.2-2009 method for measuring swelling property of wood, the chord direction swelling rate of the modified material of the embodiment is 2.5%, and the chord direction swelling rate is high;

the contact angle of the modified material of the embodiment is tested, and the contact angle of the modified material of the embodiment is 15 degrees, namely the modified material has strong hydrophilicity and is easy to react with water in the using process;

the weight gain of the modified material of this example was tested, and the modified material of this example was increased by 0% without increasing the weight.

Comparative example 2

Compared with the embodiment 1, the pre-vacuumizing in the step b, the high pressure in the wax injection process in the step g and the high temperature required by the heat treatment are removed, the treatment temperature is set to be 115 ℃ according to the melting point of the selected wax, and the rest steps are the same, namely:

b. And sealing the treatment tank, starting a vacuum pump to vacuumize the treatment tank, and reducing the pressure of the treatment tank to-0.1 MPa.

b. While the treatment tank was closed, the treatment tank was warmed to 115 ℃.

c. And (3) pouring the polyethylene wax powder into the liquid storage tank while vacuumizing and heating the treatment tank, and starting a heating system of the liquid storage tank to 115 ℃ to melt the polyethylene wax powder into liquid.

d. After the wax is completely melted, a valve communicated with the liquid storage tank and the treatment tank is opened, and the wax liquid flows into the treatment tank under the action of atmospheric pressure until the wax liquid is over the wood and is filled in the cavity of the treatment tank.

e. And closing a valve between the liquid storage tank and the treatment tank, and vacuumizing.

f. The rubber wood is treated with wax injection at 115 ℃ for 8 h.

g. The exhaust valve is opened to return the pressure of the treatment tank to atmospheric pressure.

h. And opening a valve for communicating the treatment tank with the liquid storage tank, and closing the valve after the wax liquid completely flows back to the liquid storage tank under the action of self gravity.

j. And maintaining the temperature in the treatment tank to be 115 ℃, opening a valve of the recovery pipeline, and performing secondary vacuum pumping on the treatment tank.

k. Stopping heating the treatment tank, and releasing the vacuum state of the treatment tank when the temperature of the treatment tank is reduced to 50 ℃, and discharging.

The modified rubber wood subjected to the integrated treatment of heat treatment, wax injection and dewaxing modification has a neat surface and no obvious wax residue; the color difference delta E of the walnut powder is lower than 1.2 and slightly different from that of black walnuts.

The swelling property of the modified material of the embodiment is tested according to GB/T1934.2-2009 method for measuring swelling property of wood, the chord direction swelling rate of the modified material of the embodiment is 1.8%, and the chord direction swelling rate is larger;

the contact angle of the modified material of the example is tested, and the contact angle of the modified material of the example is measured to be 70 degrees, and the material surface has certain hydrophobicity;

the weight gain of the modified material of the example is tested, the weight gain of the modified material of the example is 5 percent, the weight gain is lower, and the wax is slightly impregnated into the wood.

Example 2

The embodiment provides an integrated enhancement and modification treatment process for poplar heat treatment, wax injection and dewaxing for indoor furniture, which comprises the following specific steps:

a. the dried poplar sawn timber is stacked in a treatment tank in order, and adjacent rubber wood sawn timber is separated by a spacing bar with the section not more than 3cm multiplied by 3cm, so that the poplar sawn timber can be in full contact with a heat source and a wax liquid.

b. And (3) sealing the treatment tank, starting a vacuum pump to pre-vacuumize the treatment tank, depressurizing the treatment tank to-0.08 MPa, and continuing vacuumizing for 1 hour.

c. And (4) opening a treatment tank heating system while closing the treatment tank, and heating the treatment tank to 120 ℃.

d. The indoor furniture material has mild use environment, paraffin with the melting point of about 60 ℃ is selected to modify poplar, solid paraffin is poured into a liquid storage tank while a treatment tank is vacuumized and heated, and a heating system of the liquid storage tank is started to 90 ℃ to be melted into liquid.

g. The poplar material is soft, preferably low in pressure, the treatment tank is pressurized to 1.5MPa, and the poplar is subjected to heat treatment and high-pressure wax injection treatment at 120 ℃ for 10 hours.

j. The temperature of the treatment tank was reduced to 90 ℃ and the residual wax liquid was allowed to evaporate.

k. And opening a valve of the recovery pipeline, carrying out secondary vacuum pumping on the treatment tank, wherein the vacuum pumping time is not less than 2 hours, so that the wax steam is pumped back into the liquid storage tank from the treatment tank through the pipeline, the vacuum pump and the vacuum buffer tank.

And l, stopping heating the treatment tank, and releasing the vacuum state of the treatment tank when the temperature of the treatment tank is reduced to 40 ℃ and discharging.

The modified poplar wood integrally enhanced through the heat treatment, wax injection and dewaxing modification has the lubricous luster similar to cherry wood, the elastic modulus is also improved by 40 percent compared with an untreated material, the weight gain rate is about 20 percent, the weight of the furniture material is moderate, and the poplar wood can be used as a furniture structural component such as a table, a chair and a leg component in a solid form besides a decorative component.

Example 3

The embodiment provides a fraxinus mandshurica heat treatment, wax injection and dewaxing integrated modification treatment process for an indoor wardrobe, which comprises the following specific steps:

a. dried fraxinus mandshurica sawn timber is stacked and arranged in a treatment tank, and adjacent fraxinus mandshurica sawn timber is separated by a parting strip with the section not more than 3cm multiplied by 3cm, so that the fraxinus mandshurica sawn timber can be in full contact with a heat source and wax liquid.

b. Sealing the treatment tank, starting a vacuum pump to vacuumize the treatment tank, reducing the pressure of the treatment tank to-0.1 MPa, and continuing vacuumizing for not less than 2 h.

c. And (4) closing the treatment tank, simultaneously opening a treatment tank heating system, and heating the treatment tank to 200 ℃.

d. The wardrobe has low requirement on heat resistance in the using process, beeswax with the melting point of about 70 ℃ is selected to modify the fraxinus mandshurica, solid paraffin is poured into the liquid storage tank while the processing tank is vacuumized and heated, and the heating system of the liquid storage tank is started to 100 ℃ to melt the liquid paraffin.

g. The fraxinus mandshurica is hard, can select higher pressure, the processing tank is pressurized to 3.0MPa, and the fraxinus mandshurica is processed by heat treatment and high-pressure wax injection for 4 hours at 200 ℃.

j. The temperature of the treatment tank is reduced to 100 ℃, and the residual wax liquid is evaporated.

The fraxinus mandshurica subjected to the integrated modification treatment of heat treatment, wax injection and dewaxing modification has warm dark brown color and warm and moist luster, does not need to be coated, and simultaneously has the advantages of 23 percent of elastic modulus, 15 percent of weight gain and 40 percent of dimensional stability which are improved compared with an untreated material. The weight of the material used as a wardrobe is moderate, and the decoration and the use performance are obviously improved.

Claims

1. The utility model provides a timber thermal treatment, annotate wax, dewaxing integration modification equipment, its characterized in that, includes liquid storage pot (12), treatment tank (2), evacuation unit, pressure unit, be equipped with discharge valve (3) on treatment tank (2), pressure unit and treatment tank (2) intercommunication, evacuation unit passes through the pipeline intercommunication with liquid storage pot (12) and treatment tank (2) respectively, sets up heating device on liquid storage pot (12) and the treatment tank (2) respectively, liquid storage pot (12) pass through the pipeline intercommunication with treatment tank (2), and is equipped with valve (15) on its communicating pipeline.

2. The wood heat treatment, wax injection and dewaxing integrated modification equipment according to claim 1, wherein the vacuumizing unit comprises a vacuumizing valve (6), a wax liquid recovery pipeline (7) and a vacuum pump (10) which are arranged on the treatment tank (2), and the treatment tank (2), the vacuum pump (10) and the liquid storage tank (12) are communicated through the wax liquid recovery pipeline (7).

3. The integrated modification equipment for wood heat treatment, wax injection and dewaxing according to claim 2, wherein a vacuum buffer tank (11) is arranged between the vacuum pump (10) and the liquid storage tank (12).

4. The integrated wood heat treatment, wax injection and dewaxing modification equipment according to any one of claims 1 to 3, wherein the pressurizing unit comprises a compressor (9) and a pressurizing pipeline for communicating the compressor (9) with the treatment tank (2), and the pressurizing pipeline is provided with a pressurizing valve (8).

5. A wood heat treatment, wax injection and dewaxing integrated modification process is characterized by comprising the following steps:

s1, placing the wood into the treatment tank (2), sealing the treatment tank (2), and pre-vacuumizing the treatment tank (2): depressurizing the treatment tank to a certain pressure and maintaining for a period of time;

s2, heating the treatment tank (2) to a certain temperature, and heating the solid wax in the liquid storage tank (2) to melt the solid wax into liquid while vacuumizing and heating the treatment tank (2);

s3, making the melted wax liquid flow into the treatment tank (2) under the action of atmospheric pressure until the wax liquid is over the wood and fills the cavity of the treatment tank (2), and then closing the valve (15) between the liquid storage tank (12) and the treatment tank (2);

s4, pressurizing the treatment tank (2), and simultaneously performing heat treatment and high-pressure wax injection treatment on the wood;

s5, stopping pressurizing, and opening the exhaust valve (3) to reduce the pressure of the treatment tank to the atmospheric pressure;

s6, opening the valve (15), and closing the valve (15) after the wax liquid completely flows back to the liquid storage tank (2) under the action of self gravity; the treatment tank (2) maintains a certain temperature to evaporate residual wax liquid on the surface of the wood;

s7, carrying out secondary vacuum pumping on the processing tank (2), reducing the pressure of the processing tank to a certain pressure and maintaining the pressure for a certain time, and pumping the wax vapor from the processing tank (2) back to the liquid storage tank (12).

And S8, stopping heating the treatment tank (2), and releasing the vacuum state and discharging when the treatment tank (2) is cooled to a certain temperature.

6. The integrated modification process of heat treatment, wax injection and dewaxing of wood according to claim 5, characterized in that: in the step S1, the pressure of the treatment tank can be reduced to-0.05 MPa to-0.1 MPa according to different properties of the treated wood, and the vacuumizing time is not less than 0.5 h.

7. The integrated modification process of heat treatment, wax injection and dewaxing of wood according to claim 6, characterized in that: in the step S2, the temperature in the treatment tank is at least 20-30 ℃ higher than the melting point of the used wax, and/or the heating temperature of the liquid storage tank is at least 10-30 ℃ higher than the melting point of the used wax.

8. The integrated modification process of heat treatment, wax injection and dewaxing of wood according to claim 7, characterized in that: in the step S4, the pressure of the treatment tank is maintained at 3MPa to 5MPa, and the temperature is not lower than the melting point of the wax used by 10 ℃ to 30 ℃.

9. The integrated modification process of heat treatment, wax injection and dewaxing of wood according to claim 8, characterized in that: in the step S6, the temperature of the treatment tank is not lower than the melting point of the wax used by 10-30 ℃.

10. The integrated modification process of heat treatment, wax injection and dewaxing of wood according to claim 9, characterized in that: in said step S8, the temperature of the treatment tank is lowered to 10 ℃ or lower and less than 50 ℃ lower than the melting point of the wax used.