CN108467571B - Conductive composite material with wide resistivity distribution and preparation method thereof - Google Patents
Conductive composite material with wide resistivity distribution and preparation method thereof Download PDFInfo
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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Abstract
The invention discloses a conductive composite material with wide resistivity distribution and a preparation method thereof. The material is formed by compounding chopped carbon fibers, chopped glass fibers and a thermosetting resin matrix, and the volume resistivity of the material is 0.1-10000 omega-cm. The preparation method of the material comprises the following steps: the method realizes the wide distribution of the volume resistivity of the composite material by pre-adjusting the proportion of the chopped carbon fibers and the chopped glass fibers, the length of the chopped carbon fibers and the content of a resin matrix in the composite material, and specifically comprises the steps of proportioning and weighing of the fibers, dispersion and mixing of the fibers, and composite molding of the hybrid fibers and the thermosetting resin. The method is particularly suitable for the production of conductive composite material products with large batch and complex structural shapes, and the provided materials can be widely used for preparing electromagnetic shielding materials, wave-absorbing materials, electrothermal materials, electromagnetic radiator materials and the like.
Description
Technical Field
The invention relates to the field of functional composite materials, in particular to a conductive composite material with wide resistivity distribution and a preparation method thereof. It has the advantages of wide volume resistivity distribution range, light weight, high strength, heat resistance, corrosion resistance, easy forming, good processing performance, etc. Can be used for electromagnetic shielding materials, wave-absorbing materials, electrothermal materials, electromagnetic radiators and the like.
Background
The volume resistivity of a typical conductive material is fixed and does not vary over a wide range. Such as metal materials, conductive polymer materials, carbon materials, semiconductor materials, and the like. Moreover, the common conductive materials have obvious defects, such as that the metal materials are not corrosion-resistant and have higher density; the mechanical property of the conductive polymer material is poor; the carbon material has excellent conductive performance, but the performance of the carbon material is greatly influenced by the form of the material; the conductivity of semiconductor materials is greatly affected by the content of impurities and also by external conditions (e.g., heat, light, etc.). According to the invention, the chopped glass fiber and the chopped carbon fiber are pre-dispersed and mixed, and then are compounded with the thermosetting resin, and the volume resistivity of the material can be conveniently and flexibly regulated and controlled by adjusting parameters such as the content of the chopped carbon fiber, the length of the chopped carbon fiber, the content of the resin matrix and the like in the system. The volume resistivity of the composite material can be distributed in the range of 0.1-10000 Ω · cm, which is not realized by a single material in general.
The glass fiber is an inorganic non-metallic material with excellent performance, and has the advantages of good insulativity, strong heat resistance, high mechanical strength and good corrosion resistance. Currently, glass fibers are commonly used in composites as reinforcements in the form of continuous fiber yarns and fabrics, and chopped glass fibers are used less frequently. The carbon fiber is a microcrystalline graphite material obtained by carbonizing and graphitizing organic fiber, and the carbon content of the microcrystalline graphite material reaches over 90 percent. Carbon fiber has the characteristics of high strength, high modulus, low density and the like, so that the carbon fiber is often used as a high-strength structural material in military and civil industries.
Carbon fiber has good conductivity, and is often used as a functional filler in various functional composite materials. At present, a large number of embodiments are available for preparing functional composite materials by directly blending carbon fibers with high polymer materials or inorganic non-metallic materials, and no report is available for an embodiment in which chopped glass fibers and chopped carbon fibers are uniformly mixed and then used as fillers in functional composite materials. The chopped carbon fibers have excellent conductivity, and theoretically, a small amount of the chopped carbon fibers can achieve a good effect. However, the direct addition of chopped carbon fibers to polymeric or inorganic non-metallic materials is difficult to achieve theoretical results. Due to the sizing step and the agglomeration effect during the production of carbon fibers, the chopped carbon fibers still appear as bundles in the matrix. The chopped carbon fibers cannot be completely dispersed in the matrix and cannot be mutually overlapped to form a conductive network, so that the expected effect is difficult to achieve. After the chopped glass fibers and the chopped carbon fibers are dispersed and mixed in advance, the chopped carbon fibers form a conductive network in the chopped glass fibers, and the chopped glass fibers play a supporting and stabilizing role in the conductive network. And mixing the dispersed hybrid fibers with thermosetting resin to prepare the composite material. By controlling the parameters of carbon fiber content, carbon fiber length, resin matrix content and the like in the system, the wide distribution of volume resistivity can be realized. The use of chopped carbon fiber and chopped glass fiber realizes the light weight and high strength of the composite material. The use of the thermosetting resin greatly increases the heat resistance and the corrosion resistance of the system while ensuring the strength. Meanwhile, the hybrid fiber and the resin matrix are mixed to form an easily-formed premix, and the premix has good process performance.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a conductive composite material with wide resistivity distribution and a preparation method thereof. The provided composite material has the characteristics of light weight, high strength and volume resistivity of 0.1-10000 omega-cm; the provided preparation method of the composite material can conveniently and flexibly regulate and control the volume resistivity of the material.
The invention adopts the following technical scheme for solving the technical problems:
the conductive composite material with wide distribution of resistivity provided by the invention is compounded by chopped carbon fibers, chopped glass fibers and a thermosetting resin matrix, and the volume resistivity of the material is 0.1-10000 omega-cm.
The length of the used chopped carbon fiber is 1-20mm, and the length of the chopped glass fiber is 1-20 mm; the mass ratio of the chopped carbon fibers to the chopped glass fibers is 1:99-1: 1.
The chopped carbon fibers and the chopped glass fibers are dispersed and mixed to form the hybrid fibers, and the mass ratio of the hybrid fibers to the thermosetting resin matrix is 1:9-9: 1.
The thermosetting resin used may be one or more of epoxy resin, unsaturated polyester resin, vinyl ester resin, phenolic resin, polyurethane resin, cyanate ester resin, bismaleimide resin, polyimide resin, benzoxazine resin.
The invention provides a preparation method of a conductive composite material with wide resistivity distribution, which realizes the wide distribution of the volume resistivity of the composite material by pre-adjusting the proportion of chopped carbon fibers and chopped glass fibers, the length of the chopped carbon fibers and the content of a resin matrix in the composite material, and specifically comprises the following steps:
step one, weighing the fiber in proportion:
weighing dried chopped carbon fibers and chopped glass fibers according to the mass ratio of 1:99-1:1, wherein the lengths of the dried chopped carbon fibers and the chopped glass fibers are 1-20mm and 1-20mm respectively;
step two, dispersing and mixing fibers:
dispersing the chopped fibers in a dispersion medium into a monofilament state, dispersing the chopped glass fibers for 1-40min, mixing the chopped glass fibers with the chopped carbon fibers, and dispersing for 1-20min to obtain the hybrid fibers; the specific dispersing time needs to be determined according to the corresponding dispersing conditions, namely fiber length, fiber amount and dispersing equipment, and if liquid resin is used as a dispersing medium, the dispersed resin fiber mixture can be directly used in the next step; if the solvent is used as a dispersion medium, the next step is carried out after the corresponding solvent in the hybrid fiber needs to be removed;
step three, compounding and molding the hybrid fiber and the thermosetting resin:
mixing the hybrid fiber and the thermosetting resin matrix according to the mass ratio of 1:9-9:1, and preparing the conductive composite material by a composite material molding process.
In the second step of the method, the chopped fibers are dispersed in a dispersion medium by adopting a beater, a planetary mixer, a non-intrusive material homogenizer or an ultrasonic disperser.
In the second step of the method, the resin is one or more of epoxy resin, unsaturated polyester resin, vinyl ester resin, phenolic resin, polyurethane resin, cyanate ester resin, bismaleimide resin, polyimide resin and benzoxazine resin; the solvent is one or more of water, toluene, ethanol and acetone.
In the third step of the method, the molding process can comprise compression molding, bag-press molding, vacuum introduction molding or autoclave molding.
The volume resistivity of the conductive composite material with the wide distribution of the resistivity prepared by the method is 0.1-10000 omega cm, and the conductive composite material is used for preparing electromagnetic shielding materials, wave absorbing materials, electric heating materials or electromagnetic radiator materials.
Compared with the prior art, the invention has the following main advantages:
1. in the invention, the chopped carbon fibers and the chopped glass fibers are mixed in the material, and the insulating glass fibers with large dosage can play a role in diluting and fixing the conductive carbon fibers with small dosage. The wide distribution and adjustability of the volume resistivity of the conductive composite material are realized by adjusting the proportion of the chopped glass fibers and the chopped carbon fibers in the hybrid fibers, the length of the chopped carbon fibers and the content of the resin matrix in the composite material. Each of the three factors has a great influence on the volume resistivity of the composite material, and the control of the three factors can realize wide distribution of the volume resistivity of the composite material. The volume resistivity of the conductive composite material can be adjusted to be distributed in the range of 0.1-10000 omega-cm. The volume resistivity varies within 5 orders of magnitude, which is difficult to achieve with other single materials.
2. In the invention, a small amount of chopped carbon fibers are uniformly dispersed in the hybrid fiber system to form a conductive network, so that the material has conductivity. And the chopped glass fiber with higher content plays a role in supporting and stabilizing the conductive network in the system. The carbon fiber, the glass fiber and the resin matrix have the characteristic of low density, so the conductive composite material has the characteristics of light weight and high strength. The density is tested to be less than 1.8g/cm3。
3. In the invention, the thermosetting resin is used as the matrix material of the composite material, so that the material has good heat resistance and corrosion resistance, and the service temperature of the material can reach more than 100 ℃. Meanwhile, thermosetting resins with different heat resistance grades or corrosion resistance grades can be selected as matrix materials according to different heat resistance conditions and corrosion resistance conditions.
4. The invention mixes the mixed fiber and the resin matrix to form a premix which can be used for various composite material forming processes, can prepare composite material products with complex shapes and has good process performance.
5. In the invention, the consumption of the chopped carbon fiber is less, the consumption of the chopped glass fiber is more, and the price of the glass fiber is far lower than that of the carbon fiber, so that the cost of the material is reduced while the conductive performance of the material is ensured.
Drawings
Fig. 1 is a schematic structural view of a rod-shaped conductive composite material.
Fig. 2 is a cross-sectional view of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited to these examples.
Example 1
Drying the chopped fibers needed to be used in the experiment to constant weight, weighing 170g of chopped glass fibers with the length of 6mm, and weighing 30g of chopped carbon fibers with the length of 6 mm. Adding a proper amount of water into the beater, starting the equipment, adding the weighed chopped glass fiber into the beater, and circularly dispersing for 15 min. And adding the weighed chopped carbon fibers after 15min, continuously dispersing for 7min, and closing the beater after the dispersion is finished. Transferring the mixture of water and the hybrid fibers to suction filtration equipment, and performing suction filtration to remove most of water. The hybrid fiber obtained was manually torn into small pieces and placed in an oven at 120 ℃ to dry until the weight did not change. Weighing 116.5g of vinyl ester resin, adding 2.33g of methyl ethyl ketone peroxide (initiator) and 1.17g of cobalt naphthenate (accelerator) into the vinyl ester resin, and uniformly mixing the mixture; 40g of the hybrid fiber prepared previously was added to the resin mixture to uniformly mix the resin mixture with the hybrid fiber. The fiber and resin mixture is filled into a prepared mold, and the mold is completely closed by a press. The mold was fastened with bolts and then transferred to a 120 ℃ oven for two hours. And demolding to obtain the prepared composite material sample. The volume resistivity was measured to be 0.21. omega. cm.
Example 2
Drying the chopped fibers needed to be used in the experiment to constant weight, weighing 180g of chopped glass fibers with the length of 6mm, and weighing 20g of chopped carbon fibers with the length of 6 mm. Adding a proper amount of water into the beater, starting the equipment, adding the weighed chopped glass fiber into the beater, and circularly dispersing for 15 min. And adding the weighed chopped carbon fibers after 15min, continuously dispersing for 7min, and closing the beater after the dispersion is finished. Transferring the mixture of water and the hybrid fibers to suction filtration equipment, and performing suction filtration to remove most of water. The hybrid fiber obtained was manually torn into small pieces and placed in an oven at 120 ℃ to dry until the weight did not change. Weighing 116.5g of vinyl ester resin, adding 2.33g of methyl ethyl ketone peroxide (initiator) and 1.17g of cobalt naphthenate (accelerator) into the vinyl ester resin, and uniformly mixing the mixture; then, 40g of the hybrid fiber prepared previously was added to the resin mixture, and further mixed to sufficiently wet the fiber and the resin matrix. The fiber and resin mixture is filled into a prepared mold, and the mold is completely closed by a press. The mold was fastened with bolts and then transferred to a 120 ℃ oven for two hours. And demolding to obtain the prepared composite material sample. The volume resistivity was measured to be 0.92. omega. cm.
Example 3
Drying the chopped fibers needed to be used in the experiment to constant weight, weighing 188g of chopped glass fibers with the length of 6mm, and weighing 12g of chopped carbon fibers with the length of 6 mm. Adding a proper amount of water into the beater, starting the equipment, adding the weighed chopped glass fiber into the beater, and circularly dispersing for 15 min. And adding the weighed chopped carbon fibers after 15min, continuously dispersing for 7min, and closing the beater after the dispersion is finished. Transferring the mixture of water and the hybrid fibers to suction filtration equipment, and performing suction filtration to remove most of water. The hybrid fiber obtained was manually torn into small pieces and placed in an oven at 120 ℃ to dry until the weight did not change. Weighing 116.5g of vinyl ester resin, adding 2.33g of methyl ethyl ketone peroxide (initiator) and 1.17g of cobalt naphthenate (accelerator) into the vinyl ester resin, and uniformly mixing the mixture; then, 40g of the hybrid fiber prepared previously was added to the resin mixture, and further mixed to sufficiently wet the fiber and the resin matrix. The fiber and resin mixture is filled into a prepared mold, and the mold is completely closed by a press. The mold was fastened with bolts and then transferred to a 120 ℃ oven for two hours. And demolding to obtain the prepared composite material sample. The volume resistivity was measured to be 2.98. omega. cm.
Example 4
Drying the chopped fibers needed to be used in the experiment to constant weight, weighing 195.6g of chopped glass fibers with the length of 6mm, and weighing 4.4g of chopped carbon fibers with the length of 6 mm. Adding a proper amount of water into the beater, starting the equipment, adding the weighed chopped glass fiber into the beater, and circularly dispersing for 15 min. And adding the weighed chopped carbon fibers after 15min, continuously dispersing for 7min, and closing the beater after the dispersion is finished. Transferring the mixture of water and the hybrid fibers to suction filtration equipment, and performing suction filtration to remove most of water. The hybrid fiber obtained was manually torn into small pieces and placed in an oven at 120 ℃ to dry until the weight did not change. Weighing 116.5g of vinyl ester resin, adding 2.33g of methyl ethyl ketone peroxide (initiator) and 1.17g of cobalt naphthenate (accelerator) into the vinyl ester resin, and uniformly mixing the mixture; then, 40g of the hybrid fiber prepared previously was added to the resin mixture, and further mixed to sufficiently wet the fiber and the resin matrix. The fiber and resin mixture is filled into a prepared mold, and the mold is completely closed by a press. The mold was fastened with bolts and then transferred to a 120 ℃ oven for two hours. And demolding to obtain the prepared composite material sample. The volume resistivity was measured to be 70.7. omega. cm.
Example 5
Drying the chopped fibers needed to be used in the experiment to constant weight, weighing 195.6g of chopped glass fibers with the length of 6mm, and weighing 4.4g of chopped carbon fibers with the length of 6 mm. Adding a proper amount of water into the beater, starting the equipment, adding the weighed chopped glass fiber into the beater, and circularly dispersing for 15 min. And adding the weighed chopped carbon fibers after 15min, continuously dispersing for 7min, and closing the beater after the dispersion is finished. Transferring the mixture of water and the hybrid fibers to suction filtration equipment, and performing suction filtration to remove most of water. The hybrid fiber obtained was manually torn into small pieces and placed in an oven at 120 ℃ to dry until the weight did not change. Weighing 116.5g of vinyl ester resin, adding 2.33g of methyl ethyl ketone peroxide (initiator) and 1.17g of cobalt naphthenate (accelerator) into the vinyl ester resin, and uniformly mixing the mixture; 24g of the previously prepared hybrid fiber was added to the resin mixture and further mixed to fully impregnate the fiber and the resin matrix. The fiber and resin mixture is filled into a prepared mold, and the mold is completely closed by a press. The mold was fastened with bolts and then transferred to a 120 ℃ oven for two hours. And demolding to obtain the prepared composite material sample. The volume resistivity was found to be 692.7. omega. cm.
Example 6
Drying the chopped fibers needed to be used in the experiment to constant weight, weighing 195.6g of chopped glass fibers with the length of 6mm, and weighing 4.4g of chopped carbon fibers with the length of 6 mm. Adding a proper amount of water into the beater, starting the equipment, adding the weighed chopped glass fiber into the beater, and circularly dispersing for 15 min. And adding the weighed chopped carbon fibers after 15min, continuously dispersing for 7min, and closing the beater after the dispersion is finished. Transferring the mixture of water and the hybrid fibers to suction filtration equipment, and performing suction filtration to remove most of water. The hybrid fiber obtained was manually torn into small pieces and placed in an oven at 120 ℃ to dry until the weight did not change. Weighing 116.5g of vinyl ester resin, adding 2.33g of methyl ethyl ketone peroxide (initiator) and 1.17g of cobalt naphthenate (accelerator) into the vinyl ester resin, and uniformly mixing the mixture; then, 20g of the hybrid fiber prepared previously was added to the resin mixture, and further mixed to fully impregnate the fiber and the resin matrix. The fiber and resin mixture is filled into a prepared mold, and the mold is completely closed by a press. The mold was fastened with bolts and then transferred to a 120 ℃ oven for two hours. And demolding to obtain the prepared composite material sample. The volume resistivity was found to be 5241.8. omega. cm.
Example 7
Drying the chopped fibers needed to be used in the experiment to constant weight, weighing 195.6g of chopped glass fibers with the length of 6mm, and weighing 4.4g of chopped carbon fibers with the length of 6 mm. Adding a proper amount of water into the beater, starting the equipment, adding the weighed chopped glass fiber into the beater, and circularly dispersing for 15 min. And adding the weighed chopped carbon fibers after 15min, continuously dispersing for 7min, and closing the beater after the dispersion is finished. Transferring the mixture of water and the hybrid fibers to suction filtration equipment, and performing suction filtration to remove most of water. The hybrid fiber obtained was manually torn into small pieces and placed in an oven at 120 ℃ to dry until the weight did not change. Weighing 116.5g of vinyl ester resin, adding 2.33g of methyl ethyl ketone peroxide (initiator) and 1.17g of cobalt naphthenate (accelerator) into the vinyl ester resin, and uniformly mixing the mixture; 17.15g of the hybrid fiber prepared previously was added to the resin mixture and further mixed to thoroughly impregnate the fiber and resin matrix. The fiber and resin mixture is filled into a prepared mold, and the mold is completely closed by a press. The mold was fastened with bolts and then transferred to a 120 ℃ oven for two hours. And demolding to obtain the prepared composite material sample. The volume resistivity was found to be 9567.2. omega. cm.
Example 8
Drying the chopped fibers needed to be used in the experiment to constant weight, weighing 188g of chopped glass fibers with the length of 6mm, and weighing 12g of chopped carbon fibers with the length of 6 mm. Adding a proper amount of water into the beater, starting the equipment, adding the weighed chopped glass fiber into the beater, and circularly dispersing for 15 min. And adding the weighed chopped carbon fibers after 15min, continuously dispersing for 7min, and closing the beater after the dispersion is finished. Transferring the mixture of water and the hybrid fibers to suction filtration equipment, and performing suction filtration to remove most of water. The hybrid fiber obtained was manually torn into small pieces and placed in an oven at 120 ℃ to dry until the weight did not change. 56g of epoxy resin (brand AG-80) is weighed, 64g of methyl tetrahydrophthalic anhydride (curing agent) is added into the epoxy resin, and the mixture is uniformly mixed; then, 40g of the hybrid fiber prepared previously was added to the resin mixture, and further mixed to sufficiently wet the fiber and the resin matrix. The fiber and resin mixture is filled into a prepared mold, and the mold is completely closed by a press. Fastening the mold by using a bolt, transferring the mold into an oven, and curing by adopting a curing system of 80 ℃ for 2h +120 ℃ for 2h +160 ℃ for 2 h. And demolding to obtain the prepared composite material sample. The volume resistivity was measured to be 2.87. omega. cm.
Example 9
Drying the chopped fibers needed to be used in the experiment to constant weight, weighing 188g of chopped glass fibers with the length of 6mm, and weighing 12g of chopped carbon fibers with the length of 6 mm. Adding a proper amount of water into the beater, starting the equipment, adding the weighed chopped glass fiber into the beater, and circularly dispersing for 15 min. And adding the weighed chopped carbon fibers after 15min, continuously dispersing for 7min, and closing the beater after the dispersion is finished. Transferring the mixture of water and the hybrid fibers to suction filtration equipment, and performing suction filtration to remove most of water. The hybrid fiber obtained was manually torn into small pieces and placed in an oven at 120 ℃ to dry until the weight did not change. 120g of bisphenol E type cyanate was weighed, 0.012g of dibutyltin dilaurate (catalyst) was added thereto, and mixed uniformly; then, 40g of the hybrid fiber prepared previously was added to the resin mixture, and further mixed to sufficiently wet the fiber and the resin matrix. The fiber and resin mixture is filled into a prepared mold, and the mold is completely closed by a press. The mold was fastened with bolts and then transferred to an oven at 170 ℃ for curing for 6 h. And demolding to obtain the prepared composite material sample. The volume resistivity was measured to be 2.93. omega. cm.
The technical scheme provided by the invention can be used for preparing the conductive composite material with the volume resistivity in wide distribution. It has the advantages of adjustable volume resistivity in large range, light weight, high strength, heat resistance, corrosion resistance, easy forming, etc. Can be used for preparing electromagnetic shielding materials, wave-absorbing materials, electrothermal materials, electromagnetic radiator materials and the like.
In the above examples, the structure of the prepared rod-shaped conductive composite material sample is schematically shown in fig. 1 and 2. In the figure, 1 is a pre-buried electrode, 2 is an insulating inner core, and 3 is a conductive composite material. The pre-buried electrode is fixed on the insulating inner core in advance, and then the conductive composite material is prepared on the outer layer of the insulating inner core through a compression molding process to obtain the rod-shaped conductive composite material.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention are within the protection scope of the present invention.
Table 1 part of the examples formulations and results of volume resistivity measurements
Claims (4)
1. A process for preparing the electrically conductive composite material with wide resistivity distribution includes such steps as pre-regulating the ratio of short carbon fibres to short glass fibres, the length of short carbon fibres and compoundingThe content of the resin matrix in the composite material realizes the wide distribution of the volume resistivity of the composite material, the service temperature of the prepared material can reach more than 100 ℃, and the density is less than 1.8g/cm3The volume resistivity is 0.1-10000 omega cm, and the material is used for preparing electromagnetic shielding materials, wave-absorbing materials, electric heating materials or electromagnetic radiator materials, and the preparation method of the material specifically comprises the following steps:
step one, weighing the fiber in proportion:
weighing dried chopped carbon fibers and chopped glass fibers according to the mass ratio of 1:99-1:1, wherein the lengths of the dried chopped carbon fibers and the chopped glass fibers are 1-20mm and 1-20mm respectively;
step two, dispersing and mixing fibers:
dispersing the chopped fibers in a dispersion medium into a monofilament state, dispersing the chopped glass fibers for 1-40min, mixing the chopped glass fibers with the chopped carbon fibers, and dispersing for 1-20min to obtain the hybrid fibers; the specific dispersing time needs to be determined according to the corresponding dispersing conditions, namely fiber length, fiber amount and dispersing equipment, and if liquid resin is used as a dispersing medium, the dispersed resin fiber mixture can be directly used in the next step; if the solvent is used as a dispersion medium, the next step is carried out after the corresponding solvent in the hybrid fiber needs to be removed;
step three, compounding and molding the hybrid fiber and the thermosetting resin:
mixing the hybrid fiber and the thermosetting resin matrix according to the mass ratio of 1:9-9:1, and preparing the conductive composite material by a composite material molding process.
2. The method for preparing the conductive composite material with the wide distribution of resistivity as claimed in claim 1, wherein in the second step, the chopped fibers are dispersed in the dispersion medium by a beater, a planetary mixer, a non-intrusive material homogenizer or an ultrasonic disperser.
3. The method for preparing the conductive composite material with the wide distribution of resistivity according to claim 1, wherein in the second step, the resin is one or more of epoxy resin, unsaturated polyester resin, vinyl ester resin, phenolic resin, polyurethane resin, cyanate resin, bismaleimide resin, polyimide resin and benzoxazine resin; the solvent is one or more of water, toluene, ethanol and acetone.
4. The method for preparing the conductive composite material with the wide distribution of the resistivity as claimed in claim 1, wherein in the third step, the forming process comprises compression molding, bag-press molding, vacuum introduction molding or autoclave molding.
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