CN110964293B - Carbon-plastic composite wave-absorbing material and preparation method thereof - Google Patents
Carbon-plastic composite wave-absorbing material and preparation method thereof Download PDFInfo
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- CN110964293B CN110964293B CN201911141256.3A CN201911141256A CN110964293B CN 110964293 B CN110964293 B CN 110964293B CN 201911141256 A CN201911141256 A CN 201911141256A CN 110964293 B CN110964293 B CN 110964293B
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Abstract
The invention discloses a carbon-plastic composite wave-absorbing material and a preparation method thereof, the carbon-plastic composite wave-absorbing material comprises a charcoal sheet layer and a resin coating layer for coating the charcoal sheet layer, the charcoal sheet layer comprises a plurality of charcoal sheet units, the charcoal sheet units are mainly prepared by carbonizing the wood sheet units, the carbonization temperature is 600-800 ℃, and the carbonization time is 0.5-5 h. The preparation method comprises the steps of wood chip unit preparation, charcoal chip layer preparation and carbon-plastic composite wave-absorbing material casting molding. The carbon-plastic composite wave-absorbing material has the advantages of strong electromagnetic wave absorption capacity, wide effective wave-absorbing frequency band, strong reflection loss, simple preparation process, low cost and wide application.
Description
Technical Field
The invention belongs to the technical field of electromagnetic wave absorbing materials, relates to a carbon-plastic composite wave absorbing material and a preparation method thereof, and particularly relates to a carbon-plastic composite wave absorbing material with a coated matrix structure and a preparation method thereof.
Background
The wave-absorbing material is a special material which can allow electromagnetic waves to enter the wave-absorbing material and convert the energy of the electromagnetic waves into energy in other forms through dielectric loss so as to achieve the purpose of attenuating the electromagnetic waves. Good wave-absorbing materials need to meet impedance matching and attenuation matching, respectively. The impedance matching means that electromagnetic waves can enter the material as much as possible when they are radiated to the surface of the material, and the attenuation matching means that electromagnetic waves can be maximally attenuated in the material. Two key indexes characterizing the wave absorption performance of the wave absorbing material are reflection loss RL and an effective absorption frequency band. The reflection loss is a negative value, the smaller the value is, the stronger the reflection loss capability to electromagnetic waves is, and the effective absorption frequency band represents the electromagnetic wave frequency range of the reflection loss RL of the material to the electromagnetic waves less than or equal to minus 10 dB. Because the object protected by the wave-absorbing material is usually faced with a relatively complex electromagnetic wave environment, the effective absorption frequency band of the wave-absorbing material is wider, and the application range of the wave-absorbing material is wider. At present, common wave-absorbing materials mainly comprise carbon-based wave-absorbing materials, magnetic wave-absorbing materials and ceramic-based wave-absorbing materials. These materials all have the problems of complicated preparation process, high production cost and environmental unfriendliness.
In recent years, in order to reduce the production cost of the wave-absorbing material, researchers develop a plurality of biomass carbon-based wave-absorbing materials by taking biomass as a raw material, and the materials have the characteristics of wide raw material source, low density, adjustable wave-absorbing performance and the like. For example, the prior art discloses a biochar wave-absorbing material prepared by taking shaddock peel as a raw material, the wave-absorbing material is small in density and thin in thickness, and Xi et al disclose a charcoal wave-absorbing material prepared by taking cedar as a raw material, and the charcoal wave-absorbing material is good in wave-absorbing performance. However, the biomass charcoal material is limited by the intrinsic dielectric constant dispersion characteristic, and the effective absorption frequency band is narrow, so that the wave absorbing performance of a single biomass charcoal material cannot meet the actual use requirement. In order to improve the wave-absorbing performance of the biomass charcoal material, a commonly used modification method is to load a magnetic ferrite material in the biomass charcoal material, but the method still has the problems of complex preparation process and environmental unfriendliness, so that the development of a novel wave-absorbing material is necessary to solve the technical problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, particularly aims at the technical problems of narrow effective wave-absorbing frequency band, low practicability and the like of biomass carbon materials in the prior art, provides a carbon-plastic composite wave-absorbing material with wider effective wave-absorbing frequency band and higher practicability, and correspondingly provides a preparation method of the carbon-plastic composite wave-absorbing material which is simple to prepare, low in cost and friendly to environment.
In order to solve the technical problems, the invention adopts the following technical scheme.
The carbon-plastic composite wave-absorbing material comprises a charcoal sheet layer and a resin coating layer for coating the charcoal sheet layer, wherein the charcoal sheet layer comprises a plurality of charcoal sheet units, the charcoal sheet units are mainly prepared by carbonizing wood sheet units, the carbonization temperature is 600-800 ℃, and the carbonization time is 0.5-5 h.
In the carbon-plastic composite wave-absorbing material, the carbonization temperature is 650-690 ℃, and the carbonization time is 3-4 h.
In the carbon-plastic composite wave-absorbing material, preferably, the plurality of charcoal piece units are distributed in an array form.
In the carbon-plastic composite wave-absorbing material, the distance between adjacent charcoal piece units is preferably 1 mm-6 mm.
In the carbon-plastic composite wave-absorbing material, the number of the charcoal piece units is preferably 16 to 49.
In the carbon-plastic composite wave-absorbing material, preferably, the length of the charcoal piece unit is 20 mm-44 mm, the width is 20 mm-44 mm, and the thickness is 1 mm-5 mm.
In the carbon-plastic composite wave-absorbing material, preferably, the distance from the top surface to the bottom surface of the resin coating layer is 3-9 mm.
In the carbon-plastic composite wave-absorbing material, preferably, the resin coating layer is made of a resin material, and the resin material includes one or more of epoxy resin, polyurethane resin and phenolic resin.
In the carbon-plastic composite wave-absorbing material, preferably, the carbon-plastic composite wave-absorbing material is in a plate structure or an array structure, and the electrical conductivity of the charcoal piece units is 0.436S/m to 18.428S/m.
As a general technical concept, the invention also provides a preparation method of the carbon-plastic composite wave-absorbing material, which comprises the following steps:
(1) preparing a wood chip unit: slicing the wood blocks to obtain wood chip units;
(2) charcoal piece unit preparation: carbonizing the wood chip unit by adopting a high-temperature anaerobic carbonization process, wherein the carbonization temperature is 600-800 ℃, and the carbonization time is 0.5-5 h, so as to obtain a wood chip unit;
(3) preparing a charcoal sheet layer: drawing unit distribution grid lines at the bottom of a mold, then coating a layer of resin material as a resin bottom layer, sticking the charcoal piece units obtained in the step (2) to the resin bottom layer according to the grid units set by the unit distribution grid lines, standing and curing to form a charcoal piece layer;
(4) casting and molding the carbon-plastic composite wave-absorbing material: and casting the resin material on the charcoal sheet layer, standing and curing the resin material after the charcoal sheet layer is coated by the resin material, and demolding to form a resin coating layer, thereby obtaining the carbon-plastic composite wave-absorbing material.
In the preparation method of the carbon-plastic composite wave-absorbing material, preferably, in the step (2), the high-temperature anaerobic carbonization process comprises the following steps: under the protection of nitrogen or argon, heating the wood chip unit from room temperature to 200-250 ℃ at the heating rate of 2-10 ℃/min for pre-carbonization, preserving heat for 1-5 h, then continuously heating the wood chip unit to 600-800 ℃ at the heating rate of 2-10 ℃/min for carbonization, preserving heat for 0.5-5 h, stopping heating, naturally cooling to room temperature to obtain a semi-finished wood-charcoal piece, and polishing by abrasive paper to obtain the wood-charcoal piece unit.
In the preparation method of the carbon-plastic composite wave-absorbing material, preferably, in the step (2), the flow rate of the nitrogen or argon is 30mL/min to 60mL/min, and the sand paper polishing is to polish the surface of the semi-finished product of the charcoal piece by using sand paper with the granularity of 400 meshes to 800 meshes.
In the above preparation method of the carbon-plastic composite wave-absorbing material, preferably, in the step (3), after the resin material is coated on the surface of the resin base layer, when the resin base layer is nearly dry and can stick the charcoal piece units, the charcoal piece units obtained in the step (2) are stuck to the resin base layer according to the grid units set by the unit distribution grid lines;
and/or in the step (3), before the standing and curing, sealing the mold with the resin bottom layer and the charcoal piece unit by using tinfoil paper or a preservative film, then standing and curing, and then removing the tinfoil paper or the preservative film.
In the above preparation method of the carbon-plastic composite wave-absorbing material, preferably, in the step (3), the standing and curing is performed at room temperature and normal pressure, and the standing and curing time is 0.5h to 1.5 h;
and/or in the step (4), the standing and curing are carried out under the conditions of room temperature and normal pressure, and the standing and curing time is 8-10 h.
In the invention, the three-dimensional size of the carbon-plastic composite wave-absorbing material is preferably 180mm (length) × 180mm (width) × 3-9 mm (thickness), and the thickness of the whole material is the thickness of the bottom resin, the thickness of the charcoal piece and the thickness of the surface resin.
In the present invention, the charcoal sheet layer has an array structure composed of charcoal sheet units having electromagnetic wave absorption characteristics, and the resin coating layer is preferably a resin material having good electromagnetic wave transmission characteristics, good mechanical properties, and good sealing properties.
In the preparation method of the present invention, the mold in step (3) may preferably be a polypropylene mold, and the polypropylene mold is mainly made of a polypropylene resin plate and a hot melt adhesive, but the mold is not limited thereto, and mainly provides a cubic inner cavity structure.
And (4) calculating the mass of the required resin according to the density of the resin, the three-dimensional size of the carbon-plastic composite wave-absorbing material and the three-dimensional size of the charcoal piece unit.
The main innovation points of the invention are as follows:
researches show that in the carbonization temperature and time range limited by the invention, the charcoal piece obtained by the carbonization process (anaerobic high-temperature carbonization) has a relatively proper conductivity value, so that the charcoal piece can generate a microscopic polarization response behavior when being radiated by electromagnetic waves, thereby converting the electromagnetic wave energy into heat energy and finally realizing the effective absorption of the electromagnetic waves. But the single charcoal piece is limited by the intrinsic dielectric constant dispersion characteristic, so the effective absorption frequency band is narrow. In order to further widen the effective absorption frequency band, the invention combines a plurality of charcoal tablets into a matrix type charcoal tablet, which has better impedance matching characteristic and attenuation matching characteristic in a wider microwave frequency range, i.e. the electromagnetic wave can enter and attenuate in the material to the maximum extent, thus realizing the broadband absorption of the electromagnetic wave; in addition, the resin material with good wave-transmitting characteristic and mechanical property is adopted as the mechanical enhancement layer and the impedance matching layer of the composite material, so that the application range of the carbon-plastic composite wave-absorbing material is further widened.
Compared with the prior art, the invention has the advantages that:
(1) the carbon-plastic composite wave-absorbing material is an integrated structure material consisting of a charcoal lamella and a resin coating layer, strong absorption and broadband absorption of electromagnetic waves are realized through the charcoal lamella, and the resin coating layer not only can enable the material to obtain better impedance matching characteristics, but also can improve the mechanical property and the sealing property of the material. The carbon-plastic composite wave-absorbing material can replace or supplement the existing wave-absorbing material, and can be widely applied to the civil and military fields of electromagnetic wave radiation absorption, shielding, military equipment stealth and the like.
The wave-absorbing performance of the carbon-plastic composite wave-absorbing material can be effectively regulated by regulating the carbonization temperature, the carbonization time and the thickness of the charcoal piece unit, and the wave-absorbing performance of the carbon-plastic composite wave-absorbing material is better within the ranges of the carbonization temperature, the carbonization time and the thickness of the charcoal piece unit.
In the carbon-plastic composite wave-absorbing material, the charcoal sheet layers are distributed in an array manner, compared with an integral structure, the arrangement manner of the array structure is very flexible, and the structure can ensure that the composite material can obtain a wider effective absorption frequency band without introducing a magnetic ferrite material, thereby realizing the high-efficiency preparation and the green preparation of the high-performance composite wave-absorbing material; in addition, the array structure can also improve the utilization rate of the material to the maximum extent and reduce the preparation cost of the material on the premise of ensuring the stable wave-absorbing performance of the material.
(2) In the preparation method, the raw materials are wide in source, the preparation process is simple, the preparation cost is low, and the industrial production is easy to realize.
Drawings
Fig. 1 is a perspective schematic view of a three-dimensional structure of a carbon-plastic composite wave-absorbing material in embodiment 1 of the invention.
Fig. 2 is a schematic diagram of the distribution of the charcoal piece unit array of the carbon-plastic composite wave-absorbing material in embodiment 1 of the invention.
FIG. 3 is a reflection loss chart of the carbon-plastic composite wave-absorbing material (the thickness of the charcoal piece unit is 2.5mm, the carbonization temperature is 650 ℃, and the carbonization time is 3h) in example 1 of the invention.
FIG. 4 is a reflection loss chart of the carbon-plastic composite wave-absorbing material (the thickness of the charcoal sheet unit is 3mm, the carbonization temperature is 650 ℃, and the carbonization time is 3h) in example 2 of the invention.
FIG. 5 is a reflection loss chart of the carbon-plastic composite wave-absorbing material (the thickness of the charcoal piece unit is 2.5mm, the carbonization temperature is 670 ℃, and the carbonization time is 3h) in example 3 of the invention.
Illustration of the drawings:
1. a charcoal tablet unit.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
The materials and equipment used in the following examples are commercially available.
Example 1:
the carbon-plastic composite wave-absorbing material comprises a charcoal sheet layer and a resin coating layer for coating the charcoal sheet layer, wherein the charcoal sheet layer comprises a plurality of charcoal sheet units 1, the charcoal sheet units 1 are mainly prepared by carbonizing wood sheet units, the carbonization temperature is 650 ℃, and the carbonization time is 3 hours.
In this embodiment, there are 16 charcoal piece units 1, and as shown in fig. 2, the 16 charcoal piece units 1 are distributed in an array, that is, a matrix, the distance h between adjacent charcoal piece units 1 is 5mm, and the three-dimensional size of each charcoal piece unit 1 is 40mm (length) × 40mm (width) × 2.5mm (thickness).
In this embodiment, the resin coating layer is made of a resin material, and the resin material is epoxy resin. The resin coating layer is of a hollow cubic structure, the thickness of the resin coating layer is 5mm, the thickness of the top surface of the resin coating layer is 1mm (the thickness of surface resin), the thickness of the bottom surface of the resin coating layer is 1mm, the bottom surface of the charcoal piece unit 1 is the bottom surface of the charcoal piece unit, the carbon-plastic composite wave-absorbing material is integrally of a plate-shaped structure, and the three-dimensional size of the plate-shaped carbon-plastic composite wave-absorbing material is 180mm (length L) × 180mm (width W) × 4.5mm (height H).
The preparation method of the carbon-plastic composite wave-absorbing material comprises the following steps:
(1) preparing a wood chip unit: sawing 16 wood chip units from a masson pine block with the water content of 10-15% by using a circular saw with a push bench, wherein the three-dimensional size of each wood chip unit is 55mm (length) multiplied by 55mm (width) multiplied by 6mm (thickness), and removing the wood chips and burrs on the surfaces of the wood chip units by using scissors.
(2) Charcoal piece unit preparation: the wood chip unit is arranged in a tubular furnace, under the protection of nitrogen or argon, the flow rate of the nitrogen or argon is 50mL/min, the wood chip unit is heated to 250 ℃ at the heating rate of 5 ℃/min, pre-carbonized for 5h, then the wood chip unit is continuously heated to 650 ℃ at the temperature of 5 ℃/min for carbonization, the temperature is kept for 3h, then the heating is stopped, and the wood chip unit is naturally cooled to the room temperature, so that the semi-finished product of the wood carbon sheet is obtained. 6 surfaces of the semi-finished charcoal piece were polished using sandpaper having a particle size of 600 mesh to obtain a charcoal piece unit 1 having three-dimensional dimensions of 40mm (length) x 40mm (width) x 2.5mm (thickness).
(3) Preparing a charcoal sheet layer: a mold having a cubic inner cavity structure was prepared, and a polypropylene mold made of a polypropylene resin plate and a hot melt adhesive was used in this example, but not limited thereto. The three-dimensional dimensions of the polypropylene mold cavity were 180mm (length) x 180mm (width) x 50mm (height). Matrix unit distribution grid lines are drawn on a bottom plate of the mold, and the distance between grids of each matrix unit is 5 mm. And (3) brushing a resin bottom layer with the thickness of 1mm on a bottom plate of a polypropylene mold by adopting a brushing process, wherein the resin bottom layer is the bottom layer of a pre-prepared resin coating layer, when the resin bottom layer is nearly surface-dried and can stick the charcoal piece unit 1, sticking the charcoal piece unit 1 obtained in the step (2) on the surface of the resin bottom layer according to the distribution grid lines of the matrix unit of the mold bottom plate, sealing the mold stuck with the charcoal piece unit 1 by using tinfoil paper or a preservative film, standing and curing for 0.5h at room temperature and normal pressure, and removing the tinfoil paper or the preservative film to obtain a fixed charcoal piece layer, specifically a charcoal piece array layer.
(4) Casting and molding the carbon-plastic composite wave-absorbing material: and (3) calculating the mass of the required epoxy resin to be 80g according to the density of the epoxy resin, the three-dimensional size of the carbon-plastic composite wave-absorbing material and the three-dimensional size of the charcoal piece unit 1, uniformly casting 80g of epoxy resin into the charcoal piece array layer obtained in the step (3) by adopting a casting process, standing and curing for 8 hours at room temperature and normal pressure to form a resin coating layer, and removing a polypropylene mould to obtain the carbon-plastic composite wave-absorbing material, wherein the three-dimensional size of the carbon-plastic composite wave-absorbing material is 180mm (length) x 180mm (width) x 4.5mm (thickness). The wave absorbing performance of the carbon-plastic composite wave absorbing material is shown in figure 3, the effective wave absorbing frequency band reaches 6.21GHz (13.79 GHz-20.00 GHz), and the reflection loss peak value reaches-19.82 dB.
Example 2:
the carbon-plastic composite wave-absorbing material and the preparation method thereof are basically the same as the embodiment 1, and the differences are only that: the thickness of the charcoal piece unit 1 is 3mm, and the thickness of the carbon-plastic composite wave-absorbing material is 5 mm.
The wave absorbing performance of the carbon-plastic composite wave absorbing material obtained in the embodiment is shown in FIG. 4, the effective wave absorbing frequency band reaches 8.67GHz (11.33 GHz-20.00 GHz), and the reflection loss peak value reaches-14.92 dB.
Example 3:
the carbon-plastic composite wave-absorbing material is basically the same as the carbon-plastic composite wave-absorbing material in the embodiment 1, and the difference is only that: the carbonization temperature was 670 ℃.
The preparation method of the carbon-plastic composite wave-absorbing material is basically the same as that of the embodiment 1, and the differences are only that: the three-dimensional size of each wood chip unit is 58mm (length) multiplied by 58mm (width) multiplied by 8mm (thickness), and the carbonization temperature is 670 ℃.
The wave absorbing performance of the carbon-plastic composite wave absorbing material obtained in the embodiment is shown in FIG. 5, the effective wave absorbing frequency band reaches 3.49GHz (9.65 GHz-13.59 GHz), and the reflection loss peak value reaches-40.21 dB.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (9)
1. The carbon-plastic composite wave-absorbing material is characterized by comprising a charcoal sheet layer and a resin coating layer for coating the charcoal sheet layer, wherein the charcoal sheet layer comprises a plurality of charcoal sheet units, and the charcoal sheet units are mainly prepared by high-temperature oxygen-free carbonization of wood sheet units;
the high-temperature anaerobic carbonization process comprises the following steps: under the protection of nitrogen or argon, heating the wood chip unit from room temperature to 200-250 ℃ at the heating rate of 2-10 ℃/min for pre-carbonization, keeping the temperature for 1-5 h, then continuously heating the wood chip unit to 600-800 ℃ at the heating rate of 2-10 ℃/min for carbonization, keeping the temperature for 0.5-5 h, stopping heating and naturally cooling to room temperature.
2. The carbon-plastic composite wave-absorbing material of claim 1, wherein the carbonization temperature is 650-690 ℃, and the carbonization time is 3-4 h.
3. The carbon-plastic composite wave-absorbing material of claim 1, wherein the plurality of charcoal chip units are distributed in an array.
4. The carbon-plastic composite wave-absorbing material as claimed in claim 3, wherein the distance between adjacent charcoal chip units is 1mm to 6 mm;
and/or the number of the charcoal piece units is 16-49;
and/or the length of the charcoal piece unit is 20 mm-44 mm, the width is 20 mm-44 mm, and the thickness is 1 mm-5 mm.
5. The carbon-plastic composite wave-absorbing material as claimed in any one of claims 1 to 4, wherein the distance from the top surface to the bottom surface of the resin coating layer is 3mm to 9 mm;
and/or the resin coating layer is made of a resin material, and the resin material comprises one or more of epoxy resin, polyurethane resin and phenolic resin;
and/or the carbon-plastic composite wave-absorbing material is in a plate structure or an array structure, and the conductivity of the charcoal piece unit is 0.436S/m-18.428S/m.
6. A preparation method of the carbon-plastic composite wave-absorbing material as claimed in any one of claims 1 to 5, comprising the following steps:
(1) preparing a wood chip unit: slicing the wood blocks to obtain wood chip units;
(2) charcoal piece unit preparation: carbonizing the wood chip unit by adopting a high-temperature anaerobic carbonization process, wherein the process of the high-temperature anaerobic carbonization process is as follows: under the protection of nitrogen or argon, firstly heating the wood chip unit from room temperature to 200-250 ℃ at the heating rate of 2-10 ℃/min for pre-carbonization, preserving heat for 1-5 h, then continuously heating the wood chip unit to 600-800 ℃ at the heating rate of 2-10 ℃/min for carbonization, preserving heat for 0.5-5 h, stopping heating, naturally cooling to room temperature to obtain a semi-finished wood-charcoal piece, and polishing by abrasive paper to obtain a wood-charcoal piece unit;
(3) preparing a charcoal sheet layer: drawing unit distribution grid lines at the bottom of a mold, then coating a layer of resin material as a resin bottom layer, sticking the charcoal piece units obtained in the step (2) to the resin bottom layer according to the grid units set by the unit distribution grid lines, standing and curing to form a charcoal piece layer;
(4) casting and molding the carbon-plastic composite wave-absorbing material: and casting the resin material on the charcoal sheet layer, standing and curing the resin material after the charcoal sheet layer is coated by the resin material, and demolding to form a resin coating layer, thereby obtaining the carbon-plastic composite wave-absorbing material.
7. The preparation method of the carbon-plastic composite wave-absorbing material according to claim 6, wherein in the step (2), the flow rate of the nitrogen or argon is 30mL/min to 60mL/min, and the sand paper grinding is to grind the surface of the semi-finished product of the charcoal piece by using sand paper with the granularity of 400 meshes to 800 meshes.
8. The method for preparing the carbon-plastic composite wave-absorbing material according to claim 6 or 7, characterized in that in the step (3), after the resin material is coated with a layer of resin material as a resin bottom layer, when the resin bottom layer is nearly dried and can stick the charcoal piece units, the charcoal piece units obtained in the step (2) are stuck to the resin bottom layer according to grid units set by unit distribution grid lines;
and/or in the step (3), before the standing and curing, sealing the mold with the resin bottom layer and the charcoal piece unit by using tinfoil paper or a preservative film, then standing and curing, and then removing the tinfoil paper or the preservative film.
9. The preparation method of the carbon-plastic composite wave-absorbing material according to claim 6 or 7, wherein in the step (3), the standing and curing are performed at room temperature and normal pressure, and the standing and curing time is 0.5h to 1.5 h;
and/or in the step (4), the standing and curing are carried out under the conditions of room temperature and normal pressure, and the standing and curing time is 8-10 h.
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| CN1908344A (en) * | 2006-08-22 | 2007-02-07 | 南京林业大学 | Charring wood composite floor and manufacturing method thereof |
| CN102107447A (en) * | 2009-12-26 | 2011-06-29 | 浙江世友木业有限公司 | Wood sectional material and manufacturing method thereof |
| CN102248559A (en) * | 2011-06-19 | 2011-11-23 | 潘平 | Flame-retardant solid wood composite section and manufacturing method thereof |
| CN108943245A (en) * | 2018-08-28 | 2018-12-07 | 山东农业大学 | The preparation method of multi-functional carbonized wood |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908344A (en) * | 2006-08-22 | 2007-02-07 | 南京林业大学 | Charring wood composite floor and manufacturing method thereof |
| CN102107447A (en) * | 2009-12-26 | 2011-06-29 | 浙江世友木业有限公司 | Wood sectional material and manufacturing method thereof |
| CN102248559A (en) * | 2011-06-19 | 2011-11-23 | 潘平 | Flame-retardant solid wood composite section and manufacturing method thereof |
| CN108943245A (en) * | 2018-08-28 | 2018-12-07 | 山东农业大学 | The preparation method of multi-functional carbonized wood |
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