CN111424421A - Carbon fiber composite felt and method for enhancing heat conduction and electric conduction performance of polymer composite material - Google Patents
Carbon fiber composite felt and method for enhancing heat conduction and electric conduction performance of polymer composite material Download PDFInfo
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Abstract
The invention provides a carbon fiber composite felt and a method for enhancing the heat conduction and electric conduction performance of a polymer composite material thereof, wherein the carbon fiber forms a carbon fiber soft felt which is stacked layer by layer in an air flow net, the carbon fiber soft felt is needled in the vertical direction, a layer of organic matter is wrapped on the surface of the carbon fiber by dipping, then the carbon fiber/carbon composite hard felt is obtained by carbonization treatment at high temperature, the carbon fiber/carbon composite hard felt is chemically electroplated to obtain the carbon fiber composite felt with a metal-carbon fiber three-layer fiber structure, finally the carbon fiber composite felt is compressed according to a certain proportion to be more densely arranged, and after the polymer prepolymer is dipped in vacuum, the carbon fiber composite felt is cured at high; the carbon fiber composite felt has a multi-stage structure similar to a cable or a sesame chocolate bar, can form rich high-efficiency heat and electricity conducting paths in a composite material, obviously improves the heat conduction and the electricity conduction of a polymer, and meets the heat dissipation requirement of the existing electronic and electrical equipment.
Description
Technical Field
The invention belongs to the technical field of preparation of heat-conducting and electric-conducting composite materials, and relates to a carbon fiber composite felt and a method for enhancing the heat-conducting and electric-conducting performance of a polymer composite material.
Background
With the rapid development of microelectronic integration and assembly technology, the increasingly high requirements of the electric power and electrical insulation field on high voltage and the rapid development of other related fields, the volumes of electronic components and logic circuits are reduced by tens of millions of times, the heat generated by electronic equipment is rapidly accumulated and increased when the working frequency is increased rapidly, and the working environment temperature is also rapidly changed towards a high temperature direction. In order to ensure that electronic components can work normally with high reliability for a long time, the working temperature must be prevented from rising continuously, so that the timely heat dissipation capability becomes an important factor influencing the service life of the electronic components, and the research of polymer materials with high heat conductivity is urgently needed. The application field of the polymer material is continuously expanded because the polymer materials with different characteristics can be obtained by controlling and modifying the structure of the polymer material. And the polymer material has the characteristics of unique structure, easy modification and easy processing, so that the polymer material has incomparable and irreplaceable excellent performances of other materials, thereby being widely applied to the fields of scientific technology, national defense construction and national economy and becoming an indispensable material for various aspects of clothes, food and housing in modern social life.
The heat exchanger material used in chemical production and wastewater treatment needs to have low cost, higher heat conductivity, and high temperature resistance and excellent chemical corrosion resistance, the heat conduction materials used in electronics and electrical industry, such as high heat dissipation interface materials and shell materials, often need to have excellent electromagnetic shielding and mechanical properties to meet the use requirements, L ED lighting needs a copper-clad substrate with good heat dissipation performance, otherwise L ED and the like cannot dissipate the heat in time, and cause serious light decay to scrap the product.
Disclosure of Invention
The invention aims to overcome the defects of the existing preparation process of the carbon fiber reinforced heat-conducting and electricity-conducting composite material, provides a carbon fiber composite felt with the characteristics of high heat conductivity, electric conductivity and easiness in preparation and a preparation method thereof, and realizes the application of the carbon fiber composite felt in a polymer-based heat-conducting composite material. The invention takes carbon fiber with uniform diameter distribution as raw material, prepares carbon fiber soft felt with plane orientation by an air flow network forming technology and a needle punching method, coats a layer of organic matter on the surface of the carbon fiber by dipping the carbon fiber soft felt and a solution, then carries out carbonization treatment on the organic matter at high temperature to obtain carbon fiber/carbon composite hard felt, the hard felt has a structure that carbon surrounds the surface of the carbon fiber, further carries out chemical plating on the carbon fiber to obtain the carbon fiber composite felt with a metal-carbon fiber three-layer hybrid fiber structure, finally compresses the carbon fiber composite felt according to a certain proportion to ensure that the carbon fiber composite felt is arranged more densely, and carries out high temperature solidification and annealing after dipping a polymer prepolymer in vacuum to obtain the composite material. The carbon fiber composite felt has a three-layer multilevel structure similar to a cable or a sesame chocolate bar, can form rich high-efficiency heat and electricity conducting paths in a composite material, obviously enhances the performance of the composite material compared with the original carbon fiber polymer composite material, obviously improves the heat conduction and electricity conducting performance of the polymer, and meets the heat dissipation requirement of the existing electronic and electrical equipment.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a carbon fiber composite felt, and a preparation method of the carbon fiber composite felt comprises the following steps:
(1) carbon fibers form a carbon fiber soft felt which is stacked layer by layer in the air flow net;
(2) after the carbon fiber soft felt is subjected to z-axis needling, a layer of organic matter is wrapped on the surface of the carbon fiber through impregnation;
(3) carbonizing to obtain a carbon fiber/carbon composite hard felt;
(4) plating a metal coating or metal particles on the surface of the carbon fiber/carbon composite hard felt by a chemical plating method to obtain a carbon fiber composite felt with a metal-carbon fiber three-layer fiber structure;
(5) compressing the carbon fiber composite felt.
The hybrid carbon fiber in the carbon fiber composite felt has a multistage structure similar to a cable or a sesame chocolate bar.
The structure can effectively increase the heat conduction and electric conduction path.
The carbon fiber soft felt stacked in the plane layer by layer is oriented to the x and y axes of the carbon fibers, and the carbon fibers are in a structure arranged randomly in the plane.
The diameter of the carbon fiber is 200nm-300 μm.
The compression ratio of the carbon fiber composite felt is 0.5-10 times.
The metal is selected from one or more of nickel, silver, copper, gold, zinc and the like.
The size of the metal coating or the metal particles is 1nm-100 mu m.
The organic matter is selected from one or more of epoxy resin, phenolic resin, polydopamine, tannic acid, polyimide or thermoplastic polymer.
The temperature of the carbonization treatment is 500-3000 ℃.
The invention also comprises a method for enhancing the heat and electric conductivity of the polymer composite material by the carbon fiber composite felt, which comprises the steps of dipping the carbon fiber composite felt in a polymer prepolymer under the vacuum condition, putting the polymer prepolymer into a mould, curing the carbon fiber composite felt for 0.5 to 6 hours at a high temperature under a press, and annealing the carbon fiber composite felt in vacuum to obtain the carbon fiber composite felt enhanced polymer composite material.
The polymer prepolymer is selected from one or more of epoxy resin, polyimide, silicon rubber, polyacrylic acid, phenolic resin, urea resin or polyurethane.
The dipping time is 1-8h, and the dipping temperature is 10-50 ℃.
The curing temperature is 50-200 ℃, and the annealing temperature is 100-300 ℃.
The filling volume of the carbon fiber soft felt in the polymer composite material is 5-55%.
The invention adopts the airflow network forming technology and the needle punching method to prepare the carbon fiber soft felt with the plane orientation, and covers the carbon layer on the surface of the carbon fiber by using the organic matter dipping and carbonizing mode, thereby achieving the purposes of stabilizing the carbon fiber soft felt and improving the contact of the carbon fiber and increasing the heat conduction and electric conduction path. Depositing a layer of metal layer or metal particles on the surface of the carbon fiber/carbon composite felt by a chemical plating method to enable the carbon fiber/carbon composite felt to have a multi-stage structure similar to a cable or a sesame chocolate bar, finally compressing the carbon fiber composite felt according to a certain proportion to enable the carbon fiber composite felt to be arranged more densely, dipping the carbon fiber composite felt in a polymer prepolymer under vacuum, curing at high temperature and annealing to obtain the composite material. The special multi-stage structure of the cable or the sesame chocolate bar can enable the heat-conducting and electricity-conducting filler to form efficient heat-conducting and electricity-conducting paths in the polymer composite material, so that the purpose of remarkably improving the heat-conducting and electricity-conducting performance of the carbon fiber reinforced polymer matrix composite material by adding a small amount of filler on the basis of carbon fibers is achieved, and the heat-conducting pad of the composite material is anisotropic in electrical property and controllable in direction and has advantages in the application of device heat management. Similar preparation methods are not reported.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention designs a novel heat-conducting and electric-conducting carbon fiber filler frame, which is based on a self-made plane-oriented carbon fiber soft felt, covers a carbon layer on the surface of carbon fibers by utilizing the high-temperature carbonization characteristic of organic matters to improve the contact of the carbon fibers, electroplates metal on the basis, constructs a heat-conducting and electric-conducting bridge between the carbon fibers, compresses the carbon fiber composite felt in a certain proportion to ensure that the carbon fiber composite felt is arranged more densely, can form rich high-efficiency heat-conducting and electric-conducting paths in a composite material, and obviously improves the heat conduction and the electric conduction of a polymer;
2. the special 'cable' or 'sesame chocolate bar' multi-stage structure of the composite material can enable the heat-conducting and electricity-conducting filler to form a high-efficiency heat-conducting and electricity-conducting path in the polymer composite material, and the high vertical heat conductivity and the high electricity conductivity are achieved under the condition of small filler content, so that the addition amount of the expensive high heat-conducting filler is effectively reduced, and the production cost of the composite material is reduced;
3. the organic high-temperature carbonization and chemical metal plating and other modes used by the invention can obviously improve the heat conduction performance of the material, are expected to be applied to electronic devices as an interface heat management material, and have wide application prospect;
4. the heat-conducting and electric-conducting composite material prepared by the invention is applied to electronic device equipment, can obviously improve the heat dissipation effect of the material, and has wide heat-conducting application prospect.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of the preparation process of a carbon fiber/carbon composite fiber mat obtained in example 1 of the present invention;
FIG. 2 is a schematic diagram of the process for preparing the carbon fiber/carbon/nickel metal composite felt prepared in example 1;
FIG. 3 is a Scanning Electron Microscope (SEM) photograph of a cross section of the carbon fiber/carbon/nickel metal composite felt (electroplated for 60 minutes) prepared in example 1;
fig. 4 is an X-ray energy spectrum elemental scanning analysis chart of the carbon fiber/carbon/nickel metal composite felt prepared in example 1.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The test specimens of the present invention were molded by hot pressing in a flat vulcanizing press (model Q L B-D, Shanghai rubber machinery shop).
The dispersibility of the filler in the composite material prepared by the present invention was observed by a field emission Scanning Electron Microscope (SEM) (novannosem 450, FEI, usa).
The heat conductivity of the sample prepared by the invention is measured by adopting a laser heat conduction instrument (L FA 467HT HyperFlash @, NanoFlash, Netzsch).
Example 1
The embodiment relates to a high-thermal-conductivity and electric-conductivity carbon fiber composite felt reinforced polymer matrix composite material and a preparation method thereof, wherein the carbon fiber composite felt is prepared by impregnating a carbon fiber/carbon composite hard felt with a phenolic resin prepolymer, curing, carbonizing, electroplating metal nickel and compressing by one time; the polymer composite material is prepared by impregnating the carbon fiber composite felt in epoxy resin, curing at high temperature and annealing. The metal nickel is mutually connected with the carbon fiber and other composite carbon fibers in the composite material, so that a fully-connected hybrid heat-conducting and electric-conducting network is realized, the heat resistance is further reduced, and the heat conduction and the electric performance are improved.
The composite material is prepared by the following steps:
A. preparing an anisotropic carbon fiber/carbon composite hard felt: a carbon fiber composite soft felt formed by stacking x-axis planes and y-axis planes is prepared by taking one-dimensional carbon fibers (the diameter is about 12 mu m) with uniform size distribution as raw materials through an airflow network forming technology, and is shown in figure 1. In the soft felt structure, the fibers are randomly and disorderly arranged in a plane, and the fibers have no binding force and are very easy to disperse. On the basis, part of the fibers penetrate through the fibers randomly dispersed in the plane along the vertical direction of the z axis by a needle punching method to form the carbon fiber soft felt. The existence of the z-axis fibers increases the bonding force between the upper fiber layer and the lower fiber layer, so that the fiber felt is an integral soft carbon fiber felt with an x-y-z structure. In the anisotropic structure of the long carbon fiber, the ratio of the x-y plane to the z-direction fiber can be regulated to be 100: 1. soaking the carbon fiber soft felt in phenolic resin, taking out, performing high-temperature curing treatment at 175 ℃, and then performing carbonization treatment in a high-temperature environment of 2400 ℃ to obtain a carbon fiber/carbon composite hard felt;
B. preparing a carbon fiber/carbon/metallic nickel high-density composite felt: 500 ml of a mixed aqueous solution of nickel sulfate and nickel nitrate was prepared. After stirring well, it was heated to 45 ℃. Placing the carbon fiber/carbon composite hard felt at a cathode in a figure 2, placing a carbon rod at an anode, respectively electroplating for 15 minutes, 30 minutes, 45 minutes and 60 minutes after switching on a power supply, performing ultrasonic treatment in ethanol, then placing in an oven at 80 ℃ for drying treatment to obtain the carbon fiber/carbon/metal nickel composite felt, placing the carbon fiber/carbon/metal nickel composite felt in a press, compressing by 50% and keeping the inner part of the carbon fiber/carbon/metal nickel composite felt for 30 minutes to obtain the carbon fiber/carbon/metal nickel high-density composite felt.
C. Preparing a carbon fiber/carbon/metallic nickel polymer composite material: the epoxy resin and the curing agent are firstly uniformly mixed, the carbon fiber/carbon/metallic nickel high-density composite felt is used as a heat-conducting and electric-conducting filler network, 10g of composite fiber soft felt is completely immersed in the epoxy resin by adopting a vacuum resin transfer molding method (RTM) at room temperature, and the RTM method has the advantages that no air holes exist in the system, and simultaneously the RTM method can perform space compression on the carbon fiber soft felt to limit the area and increase the contact among fibers so as to keep the ordered arrangement of the composite carbon fiber frames. The carbon fiber/carbon/metal nickel polymer composite material is prepared by die pressing for 60 minutes at the temperature of 100 ℃ under the pressure of 10MPa, curing at high temperature and then annealing for 6 hours at the temperature of 150 ℃.
The present invention has been accomplished in view of the above, and it has been found that a highly heat and electricity conductive composite material having a carbon fiber-carbon-nickel particle structure having a multi-stage structure of 'sesame chocolate bar' is prepared, as shown in a Scanning Electron Microscope (SEM) photograph of fig. 3, in the carbon fiber prepared in example 1, straight fibers are interlaced with each other, the direction of the fibers is randomly distributed, and the diameter distribution range of the fibers is narrow, between 8 to 15 d.m.furthermore, the surface of the fibers is smooth, and no significant beads, fiber agglomeration or fiber entanglement are found.a nickel particle is uniformly coated on the fibers in the form of a single particle, the size is similar to the diameter of the carbon fiber, between 10 to 15 d.m.by testing the heat conductive property of the polymer composite material prepared in accordance with the present invention, the conductivity of a pure polymer is 2.3 × 10-7S/cm, thermal conductivity of 0.18W/(m.K), electrical conductivity of 0.32S/cm and thermal conductivity of 2.3W/(m.K) of the polymer composite material electroplated for 60 minutes. The composite material can be found under the condition of less nickel metal additionA great improvement in thermal conductivity is achieved and a high thermal and electrical conductivity anisotropy is exhibited. The above results show that compared with the prior art, the multi-stage network structure of the sesame chocolate bar prepared by the invention has outstanding advantages in improving the heat and electricity conductivity, and is expected to be applied to electronic devices to increase heat dissipation.
Comparative example 1
The comparative example relates to a preparation method of a heat-conducting and electricity-conducting carbon fiber epoxy resin composite material, and the composite material is formed by uniformly mixing carbon fibers, nickel particles and carbon particles with the same content in example 1. The carbon fiber and the mixed powder are ground, evenly mixed with an epoxy resin prepolymer and a curing agent, then molded for 1 hour at the temperature of 100 ℃ and under the pressure of 10MPa, taken out after curing, and annealed at the high temperature of 150 ℃ for 6 hours in a vacuum state in an oven to obtain the carbon fiber epoxy resin composite material with the directly hot-pressed filler randomly dispersed.
The polymer composite material prepared in comparative example 1 was tested for thermal and electrical conductivity, and the conductivity of the pure polymer was 2.3 × 10-7S/cm, the thermal conductivity is 0.18W/(m.K), the electrical conductivity of the composite material is 0.0027S/cm, and the thermal conductivity is 0.5W/(m.K). It can be found that the thermal conductivity and the electrical conductivity of the composite material show a certain small improvement at a small addition amount of metallic nickel, but compared with example 1, the thermal conductivity and the electrical conductivity of the composite material in comparative example 1 are obviously lower and the increase efficiency of the thermal conductivity is also low at the same addition amount of the filler.
Comparative example 2
The comparative example relates to a preparation method of a heat-conducting and electricity-conducting carbon fiber epoxy resin composite material, and the composite material is an anisotropic carbon fiber/carbon composite hard felt prepared by the same method in the example 1. Uniformly mixing the nickel metal particles with the same content in the example 1, the epoxy resin prepolymer and the curing agent, pouring the carbon fiber/carbon composite hard felt into the composite resin prepolymer by a vacuum Resin Transfer Molding (RTM) method at room temperature, then molding at 100 ℃ under the pressure of 10MPa for 1 hour, taking out after curing, and carrying out high-temperature annealing treatment at 150 ℃ in a vacuum oven for 6 hours to obtain the carbon fiber/carbon epoxy resin composite material with the randomly dispersed nickel filler.
The implementation effect is as follows: the polymer composite material prepared in the comparative example 2 was tested for thermal and electrical conductivity, and the composite material had an electrical conductivity of 0.056S/cm and a thermal conductivity of 1.5W/(m · K). On the basis of the anisotropic carbon fiber/carbon composite hard felt, the thermal conductivity and the electrical conductivity of the composite material are improved to a certain extent in comparison with those of comparative example 1 under the condition that less metal nickel is randomly added, but compared with example 1, the thermal conductivity and the electrical conductivity of the composite material in comparative example 1 are obviously lower under the condition that the addition amount of the filler is the same, and the thermal conductivity increasing efficiency is low.
Comparative example 3
The comparative example relates to a preparation method of a heat-conducting and electric-conducting carbon fiber epoxy resin composite material, the composite material is prepared by taking the same content of carbon fibers as a raw material in example 1, preparing nickel metal deposited carbon fiber composite fibers by using the same electroplating method as step B in example 1, uniformly mixing carbon particles with the same content as in example 1, an epoxy resin prepolymer and a curing agent, pouring a carbon fiber/nickel composite hard felt by using a vacuum resin transfer molding method (RTM) for the composite resin prepolymer at room temperature, then carrying out die pressing at 100 ℃ and 10MPa for 1 hour, taking out after curing, and carrying out high-temperature annealing treatment at 150 ℃ for 6 hours in a vacuum state in an oven to obtain the carbon fiber/nickel epoxy resin composite material with randomly dispersed carbon fillers.
The implementation effect is as follows: the polymer composite material prepared in the comparative example 3 was tested for thermal and electrical conductivity, and the composite material had an electrical conductivity of 0.031S/cm and a thermal conductivity of 1.2W/(m · K). On the basis of the anisotropic carbon fiber/carbon composite hard felt, the thermal conductivity and the electrical conductivity of the composite material are improved to a certain extent in comparison with those of comparative example 1 under the condition that less metal nickel is randomly added, but compared with example 1, the thermal conductivity and the electrical conductivity of the composite material in comparative example 1 are obviously lower under the condition that the addition amount of the filler is the same, and the thermal conductivity increasing efficiency is low.
Example 2
The embodiment relates to a high-thermal-conductivity and electric-conductivity carbon fiber composite felt reinforced polymer matrix composite material and a preparation method thereof, wherein the carbon fiber composite felt is prepared by impregnating a carbon fiber/carbon composite hard felt with a phenolic resin prepolymer, curing, carbonizing, electroplating metal copper and compressing by one time; the polymer composite material is prepared by impregnating the carbon fiber composite felt in epoxy resin, curing at high temperature and annealing. The metal copper is mutually connected with the carbon fiber and other composite carbon fibers in the composite material, so that a fully-connected hybrid heat-conducting and electric-conducting network is realized, the heat resistance is further reduced, and the heat conduction and the electric performance are improved.
The composite material is prepared by the following steps:
A. preparing an anisotropic carbon fiber/carbon composite hard felt: same as example 1, step A;
B. preparing a carbon fiber/carbon/metal copper high-density composite felt: 500 ml of an aqueous copper sulfate solution was first prepared. After stirring well, it was heated to 45 ℃. Placing the carbon fiber/carbon composite hard felt at a cathode, placing a carbon rod at an anode, respectively electroplating for 60 minutes after switching on a power supply, performing ultrasonic treatment in ethanol, then placing in an oven at 80 ℃ for drying treatment to obtain a carbon fiber/carbon/metal copper composite felt, placing the carbon fiber/carbon/metal copper composite felt in a press, compressing by 50% and keeping for 30 minutes to make the interior of the carbon fiber/carbon/metal copper composite felt more compact to obtain the carbon fiber/carbon/metal copper high-density composite felt.
C. Preparing a carbon fiber/carbon/metal copper polymer composite material: same as example 1, step C.
The preparation method has the advantages that the high-heat-conductivity and electric-conductivity composite material with the carbon fiber-carbon-copper particle structure of the 'sesame chocolate bar' multi-stage structure is prepared, the copper particles are well and uniformly covered on the fibers in the form of single particles, the size of the copper particles is similar to the diameter of the carbon fibers, and the conductivity of a pure polymer is 2.3 × 10 when the heat conductivity of the polymer composite material prepared by the preparation method is tested at 5-20 mu m-7S/cm, thermal conductivity of 0.18W/(m.K), electrical conductivity of 0.86S/cm and thermal conductivity of 2.7W/(m.K) of the polymer composite material electroplated for 60 minutes. It can be found that the composite material achieves a great increase in thermal conductivity with less copper metal addition and exhibits a high thermal and electrical conductivity anisotropy. The above results demonstrate that the present invention compares to the prior artThe prepared 'sesame chocolate bar' multi-level network structure has outstanding advantages in the aspect of improving heat and electricity conductivity, and is expected to be applied to electronic devices to increase heat dissipation.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. The preparation method of the carbon fiber composite felt is characterized by comprising the following steps of:
(1) carbon fibers form a carbon fiber soft felt which is stacked layer by layer in the air flow net;
(2) after the carbon fiber soft felt is subjected to z-axis needling, a layer of organic matter is wrapped on the surface of the carbon fiber through impregnation;
(3) carbonizing to obtain a carbon fiber/carbon composite hard felt;
(4) plating a metal coating or metal particles on the surface of the carbon fiber/carbon composite hard felt by a chemical plating method to obtain a carbon fiber composite felt with a metal-carbon fiber three-layer fiber structure;
(5) compressing the carbon fiber composite felt.
2. The carbon fiber composite felt according to claim 1, wherein the in-plane layer-by-layer stacking carbon fiber soft felt is in x and y axis orientation of carbon fibers, and the carbon fibers are in a random arrangement structure in a plane.
3. The carbon fiber composite felt according to claim 1 or 2, wherein the carbon fiber diameter is 200nm to 300 μm.
4. The carbon fiber composite felt according to claim 1 or 2, wherein a compression ratio of the carbon fiber composite felt is 0.5 to 10 times.
5. The carbon fiber composite felt according to claim 1 or 2, wherein the metal is selected from one or more of nickel, silver, copper, gold, zinc, and the like; the size of the metal coating or the metal particles is 1nm-100 mu m.
6. The carbon fiber composite felt according to claim 1 or 2, wherein the organic matter is one or more selected from epoxy resin, phenolic resin, polydopamine, tannic acid, polyimide or thermoplastic polymer; the temperature of the carbonization treatment is 500-3000 ℃.
7. The carbon fiber composite felt according to claim 1 or 2, wherein the hybrid carbon fibers in the carbon fiber composite felt have a multi-stage structure similar to a "cable" or a "sesame chocolate bar".
8. The method for enhancing the heat and electric conductivity of the polymer composite material by the carbon fiber composite felt according to any one of claims 1 to 7, wherein the carbon fiber composite felt according to any one of claims 1 to 7 is dipped in a polymer prepolymer under a vacuum condition, placed in a mold and cured at a high temperature for 0.5 to 6 hours under a press, and then vacuum annealed to obtain the carbon fiber composite felt enhanced polymer composite material.
9. The method of claim 8, wherein the polymer prepolymer is selected from one or more of epoxy, polyimide, silicone rubber, polyacrylic acid, phenolic resin, urea-formaldehyde resin, or polyurethane; the dipping time is 1-8h, and the dipping temperature is 10-50 ℃.
10. The method as claimed in claim 8 or 9, wherein the curing temperature is 50-200 ℃ and the annealing temperature is 100-300 ℃; the filling volume of the carbon fiber soft felt in the polymer composite material is 5-55%.
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Effective date of registration: 20220928 Address after: No. 1777, Qingdong 2nd Road, Jiangdong Industrial Park, dajiangdong Industrial Cluster District, Hangzhou, Zhejiang Province Patentee after: HANGZHOU VULCAN NEW MATERIAL TECHNOLOGY Co.,Ltd. Patentee after: Zhuji laiken Zhongzhi New Material Co.,Ltd. Address before: No. 1777, Qingdong 2nd Road, Jiangdong Industrial Park, dajiangdong Industrial Cluster District, Hangzhou, Zhejiang Province Patentee before: HANGZHOU VULCAN NEW MATERIAL TECHNOLOGY Co.,Ltd. |