CN113024265A - Soft felt with surface treatment and manufacturing method thereof - Google Patents
Soft felt with surface treatment and manufacturing method thereof Download PDFInfo
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- CN113024265A CN113024265A CN202110261419.2A CN202110261419A CN113024265A CN 113024265 A CN113024265 A CN 113024265A CN 202110261419 A CN202110261419 A CN 202110261419A CN 113024265 A CN113024265 A CN 113024265A
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- 238000004381 surface treatment Methods 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 26
- 238000000576 coating method Methods 0.000 claims abstract description 93
- 239000011248 coating agent Substances 0.000 claims abstract description 90
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000000463 material Substances 0.000 claims abstract description 36
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 35
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 24
- 239000010439 graphite Substances 0.000 claims abstract description 24
- 239000000839 emulsion Substances 0.000 claims abstract description 16
- 239000003292 glue Substances 0.000 claims abstract description 12
- 239000000919 ceramic Substances 0.000 claims abstract description 9
- 239000004964 aerogel Substances 0.000 claims abstract description 4
- 239000006260 foam Substances 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 28
- 238000003763 carbonization Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 10
- 239000011247 coating layer Substances 0.000 claims description 8
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- 229920006122 polyamide resin Polymers 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 22
- 230000008569 process Effects 0.000 description 10
- 238000005265 energy consumption Methods 0.000 description 9
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- 230000000694 effects Effects 0.000 description 8
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- 229920000049 Carbon (fiber) Polymers 0.000 description 5
- 239000004917 carbon fiber Substances 0.000 description 5
- 239000011810 insulating material Substances 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 229920006282 Phenolic fiber Polymers 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000004760 aramid Substances 0.000 description 2
- 229920006231 aramid fiber Polymers 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 238000010000 carbonizing Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000003779 heat-resistant material Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/524—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from polymer precursors, e.g. glass-like carbon material
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
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Abstract
The invention provides a soft felt with surface treatment, which comprises a felt layer and at least one coating, wherein the coating is arranged on the surface of the felt layer; the coating is made of the following materials: one or more of graphite glue or emulsion, aerogel emulsion, foam carbon glue or emulsion, ceramic glue or emulsion. The soft felt surface hole sealing of this application reduces the corruption, promotes soft felt life-span.
Description
Technical Field
The invention relates to a new material in the manufacturing process of monocrystalline silicon or polycrystalline silicon, in particular to a soft felt with good surface treatment and heat preservation performance and a manufacturing method thereof.
Background
With the development of science and technology, the novel material gradually replaces the traditional material, such as the preparation of monocrystalline polysilicon in the solar photovoltaic industry, the powder metallurgy industry and the like, has obvious advantages compared with the traditional material, particularly, the environmental pollution can be reduced to the greatest extent in the aspect of environmental protection, along with the improvement of the environmental protection requirement, the traditional thermal power generation is gradually replaced by the emerging photovoltaic power generation in the aspect of power generation, the preparation of high-purity monocrystalline and polycrystalline silicon wafers in the photovoltaic industry increases the production cost to a certain extent due to larger energy consumption, the carbon fiber heat-insulating material has good heat-insulating effect, the energy consumption can be greatly reduced through the heat-insulating effect of the carbon fiber heat-insulating material, meanwhile, the carbon fiber heat-insulating material has high purity, other impurity ash is not introduced, the purity of the product is effectively ensured, and the utilization rate of the photovoltaic industry to the carbon fiber heat-insulating material is greatly promoted by the advantage. In the production of the crystal, the crystal comprises a thermal field device such as a crucible, a guide cylinder, a heat-preserving barrel and the like, the material of the thermal field device is generally graphite, ceramic, metal and the like, and the problems of cracking, erosion loss and the like exist. Moreover, as the diameter of the grown crystal grows thicker and thicker, the diameter of the corresponding furnace is made larger and larger, and thus the reliability of the thermal field is required to be higher and higher.
The oxidation felt is used as an intermediate of the carbon fiber heat-insulating material, the use amount is gradually increased under the large environment of the current market, and if the heat-insulating effect of the oxidation felt is improved, the energy consumption can be greatly reduced, the enterprise cost is reduced, and a good effect on environmental protection is achieved.
Thus, there is also a place to lift the material of the prior art thermal field devices.
Disclosure of Invention
Aiming at the defects, the invention aims to provide a soft felt with surface treatment and good heat preservation performance and a manufacturing method thereof, so as to solve the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a soft felt with a surface treatment, the soft felt comprises a felt layer and at least one coating, and the coating is arranged on the surface of the felt layer; the coating is made of the following materials: one or more of graphite glue or emulsion, aerogel emulsion, foam carbon glue or emulsion, ceramic glue or emulsion.
According to the soft felt with the surface treatment, the thickness of the coating is less than or equal to 5 mm.
A soft felt with a surface treatment, the soft felt comprising a felt layer and at least one binder coating, the binder coating being disposed on a surface of the felt layer; the material of the binder coating is thermosetting resin, including but not limited to one or more of epoxy resin, phenolic resin, polyacrylic acid and polyamide resin.
According to the soft felt with the surface treatment, the thickness of the adhesive coating is less than or equal to 5 mm.
A method of making a soft felt, the method comprising the steps of:
A. placing the felt on an unreeling frame;
B. passing the felt through a blade coating roller, and coating the surface of the felt with a coating material of a coating;
C. attaching release paper;
D. and (6) rolling.
A method of making a soft felt, the method comprising the steps of:
A. placing the pre-oxidized felt on an unreeling frame;
B. entering a continuous carbonization furnace for carbonization to form a carbon felt;
C. passing the carbon felt through a blade coating roller, and coating the surface of the carbon felt with a coating material of a coating;
D. attaching release paper;
E. and (6) rolling.
A method of making a soft felt, the method comprising the steps of:
A. placing the pre-oxidized felt on an unreeling frame;
B. entering a continuous carbonization furnace for carbonization to form a carbon felt;
C. graphitizing the carbon felt to obtain a graphite soft felt;
D. passing the graphite soft felt through a blade coating roller, and coating a coating material of a coating on the surface of the graphite soft felt;
E. attaching release paper;
F. and (6) rolling.
The core thought of this application lies in, makes a soft felt, the at least surface of soft felt carries out the coating technology, makes at least one surface of soft felt produces a high temperature resistant coating, and in the coating technology, the coating material forms high temperature resistant coating on the surface of felt, and this high temperature resistant coating makes the surface hole sealing of felt, can reduce the corruption, promotes soft felt life-span, and in addition, this high temperature resistant coating coefficient of heat conductivity is little, can effectively reduce temperature transfer speed, and thermal field heat loss is few, can practice thrift the energy consumption.
Due to the adoption of the technical characteristics, compared with the prior art, the invention has the following advantages and positive effects:
1. the hole sealing is carried out on the surface of the soft felt, so that the surface corrosion is reduced, and the service life of the soft felt is prolonged;
2. the thermal insulation material on the surface of the soft felt is small in thermal conductivity coefficient, so that the temperature transfer speed can be effectively reduced, and the energy consumption is saved;
3. the soft felt prepared by the method can be self-cured after being heated in the use process of a thermal field, and layers are bonded, so that the thermal conductivity coefficient is lower than that of an integrally cured heat insulation layer, and the purposes of energy conservation and consumption reduction can be achieved;
4. the soft felt of making of this application can self-curing after being heated in the use, with bonding between layer and the layer, convenient transport and dismouting promote work efficiency.
Of course, it is not necessary for any particular embodiment of the inventive concept to be implemented to achieve all of the above technical effects at the same time.
Drawings
FIG. 1 is a schematic view of a soft felt of the present application;
FIG. 2 is a flow chart of the manufacture of the soft felt of the present application;
FIG. 3 is another flow chart of the soft felt of the present application;
fig. 4 is a flow chart of another method for making the soft felt of the present application.
Detailed Description
Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The invention is intended to cover alternatives, modifications, equivalents, and alternatives that may be included within the spirit and scope of the invention. In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, and so forth have not been described in detail so as not to unnecessarily obscure aspects of the present invention.
The present application will be described in detail below with reference to the accompanying drawings. Referring to fig. 1, a schematic diagram of a soft felt of the present application, which uses a material between a thermal field, such as a draft tube and an inner tube; the number of coating layers is shown as one, and the coating process is performed on only one surface of the felt layer, but it is not intended to limit the present application, for example, the coating process is also performed on the other surface of the felt layer, so that both surfaces of the felt layer have the coating layers, and the present application is also within the scope of the present application. As used herein, a mat is a mat body made of a heat resistant material, including but not limited to one or more of a pre-oxidized mat, a carbon mat, a graphite mat, an aramid mat, a phenolic fiber mat, and a ceramic fiber mat.
As shown in fig. 1, the soft felt includes a felt layer 10 and a coating layer 20 disposed on one surface of the felt layer; the coating material of the coating is as follows: one or more of graphite glue or emulsion, aerogel emulsion, foam carbon glue or emulsion, ceramic glue or emulsion. In the coating process, the coating material forms a high-temperature-resistant coating on the surface of the felt, the high-temperature-resistant coating enables the surface of the felt to be sealed, corrosion can be reduced, the service life of the soft felt is prolonged, in addition, the high-temperature-resistant coating is small in heat conductivity coefficient, the temperature transfer speed can be effectively reduced, heat loss of a thermal field is low, the energy consumption of the thermal field can be saved, and the enterprise cost is reduced.
In addition, another embodiment of the present application provides a soft felt with a surface treatment, the soft felt comprising a felt layer and at least one binder coating, as shown in FIG. 1, disposed on a surface of the felt layer; the material of the binder coating is thermosetting resin, including but not limited to one or more of epoxy resin, phenolic resin, polyacrylic acid and polyamide resin.
The thickness of the adhesive coating is less than or equal to 5 mm.
Preferably, the thickness of the coating 20 or the adhesive coating is 5mm or less. The thickness is set according to the following: the thickness guarantees that the hole sealing effect can be in the solidification, or can satisfy the interlaminar strength of bonding can, can not be too thick because of following reason: 1. too thick and high in cost; 2. the thickness is too large, and the bending and rolling are not easy to occur; 3. the thickness is too large, so that the adhesive can flow, and the uniformity is not easy to control during curing; 4. the excessive thickness can cause the excessive coating content, so that the volume density of the cured felt body exceeds the standard, the heat conductivity coefficient is increased, and the heat preservation effect is influenced; 5. the thickness of the bonding layer is too large due to too large thickness, the volume fraction of the soft felt is influenced, and the heat preservation effect is poor.
In the manufacturing method of the two types of soft felt, since the material of the coating layer is different from that of the soft felt and the manufacturing process is not affected, the coating layer and the binder coating layer are represented by the coating layer only in the following manufacturing method.
Referring to fig. 2, the method for manufacturing the soft felt includes: the manufacturing method comprises the following steps:
the felt used in the step is a felt body made of heat-resistant materials, including but not limited to one or more of pre-oxidized felt, aramid felt, phenolic fiber felt and ceramic fiber felt, and the function of the unreeling rack is used for placing and preparing the next process of the felt;
102, passing the felt through a blade coating roller, and coating the surface of the felt with a coating material of a coating;
the advancing speed of the felt in the step is 1m/min (the speed is an exemplary value and cannot be used as a unique designated speed, and the speed can be properly adjusted according to the thickness of the coating and the material of the felt body); the shape of the knife coating roller is a flat roller, but the application is not limited, and the knife coating roller is used for protecting the application as long as the knife coating roller can uniformly coat; the position of the coating can be on one side of the felt or on both sides of the felt;
in the step, the surface of the felt coated with the coating is attached with release paper to protect the felt;
the felt attached with the release paper is rolled up and stored for later use, different modes for manufacturing the soft felt are selected according to different application scenes, and when a thermal field environment is used below 700 ℃, the soft felt manufactured by one or more of a pre-oxidized felt, an aramid fiber felt, a phenolic fiber felt and a ceramic fiber felt is coated with a coating.
Referring to fig. 3, two of the manufacturing methods of the soft felt are: the manufacturing method comprises the following steps:
the felt used in this step is pre-oxidized felt, and the function of the unreeling rack is used for placing and preparing the next process of the felt;
202, carbonizing in a continuous carbonization furnace to form a carbon felt;
the speed of the continuous carbonization furnace in the step is 1m/min (the speed is an exemplary value and cannot be used as a unique designated speed, the speed can be properly adjusted according to the thickness of the coating and the material of the felt body), the temperature is controlled in a segmented manner, for example, the first section is 300-500 ℃, the second section is 500-700 ℃, the third section is 700-900 ℃, the fourth section is 900-1250 ℃, and the number of the sections is related to the material of the felt body and the requirement of the final carbon felt. The whole carbonization process is under inert gas protective atmosphere or vacuum atmosphere;
the advancing speed of the carbon felt in the step is 1m/min (the speed is an exemplary value and cannot be used as a unique designated speed, and the speed can be properly adjusted according to the thickness of the coating and the material of the felt body); the shape of the knife coating roller is a flat roller, but the application is not limited, and the knife coating roller is used for protecting the application as long as the knife coating roller can uniformly coat; the position of the coating can be on one side of the carbon felt or on both sides of the carbon felt;
in the step, release paper is attached to the surface of the carbon felt coated with the coating to protect the carbon felt;
the carbon felt attached to the release paper is rolled up and stored for later use, different modes for manufacturing the soft felt are selected according to different application scenes, and when a thermal field environment is used below 1400 ℃, the soft felt manufactured by the carbon felt is coated with a coating.
Referring to fig. 4, please refer to the manufacturing method of the soft felt, wherein three of the methods are: the manufacturing method comprises the following steps:
301, placing the pre-oxidized felt on an unreeling frame;
the felt used in this step is pre-oxidized felt, and the function of the unreeling rack is used for placing and preparing the next process of the felt;
the speed of the continuous carbonization furnace in the step is 1m/min (the speed is an exemplary numerical value and cannot be used as a unique designated speed, the speed can be properly adjusted according to the thickness of the coating and the material of the felt body), the temperature is controlled in a segmented manner, for example, the first section is 300-500 ℃, the second section is 500-700 ℃, the third section is 700-900 ℃, the fourth section is 900-1250 ℃, and the number of the sections is related to the material of the felt body and the requirement of the final carbon felt; the whole carbonization process is under inert gas protective atmosphere or vacuum atmosphere;
in the step, the advancing speed of the carbon felt is 1m/min (the speed is an example numerical value and cannot be used as a unique designated speed, and the speed can be properly adjusted according to the thickness of the coating and the material of the felt body), and the temperature is controlled in a segmented manner, for example, the first section is 1600-1800 ℃, the second section is 1800-2000 ℃, and the third section is 2000-2500 ℃; the number of the sections is related to the material of the felt body and the requirement of the final graphite felt; the whole process is inert gas protective atmosphere or vacuum atmosphere;
304, passing the graphite soft felt through a blade coating roller, and coating a coating material of a coating on the surface of the graphite soft felt;
the advancing speed of the graphite soft felt in the step is 1m/min (the speed is an exemplary numerical value and cannot be used as a unique designated speed, and the speed can be properly adjusted according to the thickness of the coating and the material of the felt body); the shape of the knife coating roller is a flat roller, but the application is not limited, and the knife coating roller is used for protecting the application as long as the knife coating roller can uniformly coat; the position of the coating can be on one side of the graphite soft felt or on the two sides of the graphite soft felt;
in the step, release paper is attached to the surface of the carbon felt coated with the coating to protect the carbon felt;
the soft felt of graphite that will attach release paper rolls up and deposits to use later on, this application is different according to the application scene, selects the mode of the soft felt of different preparation, uses the thermal field environment to scribble the coating when more than 1400 degrees later on, the soft felt that uses the soft felt of graphite preparation.
The three methods for manufacturing the soft felt are different according to different application scenes, different forming methods are selected, when the soft felt is used below 700 ℃, a pre-oxidized fiber soft felt is obtained by coating one or more of a pre-oxidized felt, an aramid fiber felt, a phenolic fiber felt and a ceramic fiber felt, the corresponding environment temperature of the pre-oxidized fiber soft felt is low, and the pre-oxidized fiber soft felt can be manufactured by using a short process; in addition, when the carbon felt is used below 1400 ℃, the carbon felt is coated to obtain a carbon felt soft felt; when the graphite felt is used at 1400 degrees or more, a graphite felt is coated to obtain a graphite soft felt. Different soft felts are used under different thermal field environment requirements, so that the environment requirements can be met, and the cost can be saved. In addition, after coating materials are coated, the processes of attaching release paper and rolling are carried out. The soft felt is not heated, but is cured when the soft felt is heated in a thermal field, and the layer are bonded, so that the heat conductivity coefficient of the heat insulation layer is smaller than that of the integrally cured heat insulation layer, the heat insulation layer is convenient to carry, disassemble and assemble, and the working efficiency is improved.
In summary, due to the adoption of the technical characteristics, compared with the prior art, the invention has the following advantages and positive effects:
1. the hole sealing is carried out on the surface of the soft felt, so that the surface corrosion is reduced, and the service life of the soft felt is prolonged;
2. the thermal insulation material on the surface of the soft felt is small in thermal conductivity coefficient, so that the temperature transfer speed can be effectively reduced, and the energy consumption is saved;
3. the soft felt prepared by the method can be self-cured after being heated in the use process of a thermal field, and layers are bonded, so that the thermal conductivity coefficient is lower than that of an integrally cured heat insulation layer, and the purposes of energy conservation and consumption reduction can be achieved;
4. the soft felt that this application was made can self-curing after being heated in the use, with bonding between layer and the layer, convenient transport and dismouting promote work efficiency.
The preferred embodiments of the invention are provided solely to aid in the illustration of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents. The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and it is intended that all equivalent variations and modifications of the present invention as those skilled in the art can be made without departing from the spirit and scope of the present invention.
Claims (7)
1. A soft felt with surface treatment, which is characterized by comprising a felt layer and at least one coating, wherein the coating is arranged on the surface of the felt layer; the coating is made of the following materials: one or more of graphite glue or emulsion, aerogel emulsion, foam carbon glue or emulsion, ceramic glue or emulsion.
2. The soft felt with surface treatment according to claim 1, wherein the thickness of the coating layer is 5mm or less.
3. A soft felt with a surface treatment, characterized in that the soft felt comprises a felt layer and at least one binder coating, wherein the binder coating is arranged on the surface of the felt layer; the material of the binder coating is thermosetting resin, including but not limited to one or more of epoxy resin, phenolic resin, polyacrylic acid and polyamide resin.
4. The soft mat with a surface treatment according to claim 3, wherein the thickness of the binder coating is 5mm or less.
5. A method of making the soft felt according to claim 1 or 3, comprising the steps of:
A. placing the felt on an unreeling frame;
B. passing the felt through a blade coating roller, and coating the surface of the felt with a coating material of a coating;
C. attaching release paper;
D. and (6) rolling.
6. A method of making the soft felt according to claim 1 or 3, comprising the steps of:
A. placing the pre-oxidized felt on an unreeling frame;
B. entering a continuous carbonization furnace for carbonization to form a carbon felt;
C. passing the carbon felt through a blade coating roller, and coating the surface of the carbon felt with a coating material of a coating;
D. attaching release paper;
E. and (6) rolling.
7. A method of making the soft felt according to claim 1 or 3, comprising the steps of:
A. placing the pre-oxidized felt on an unreeling frame;
B. entering a continuous carbonization furnace for carbonization to form a carbon felt;
C. graphitizing the carbon felt to obtain a graphite soft felt;
D. passing the graphite soft felt through a blade coating roller, and coating a coating material of a coating on the surface of the graphite soft felt;
E. attaching release paper;
F. and (6) rolling.
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