Anisotropic carbon fiber reinforced epoxy resin composite material and preparation method thereof
By introducing short-cut carbon fibers with surface-modified nickel microneedles into epoxy resin matrix materials and utilizing magnetic field orientation distribution, the toughness and conductivity problems of epoxy resin were solved, achieving improved high conductivity and strength, thus expanding its application range.
Patent Information
- Application Number
- CN202511711502.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-20
- Publication Date
- 2026-01-23
AI Technical Summary
After curing, epoxy resin has a high crosslinking density, low toughness, high brittleness, and is prone to cracking. It also has poor conductivity, which limits its application range, especially in anisotropic conductive adhesives.
By introducing short-cut carbon fibers with surface-modified nickel microneedles into an epoxy resin matrix, and using a magnetic field to orient them to form conductive pathways, the conductivity, strength, and toughness of the material are improved.
This has resulted in improved conductivity, strength, and toughness of epoxy resin matrix materials, expanding their application range.
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Figure CN121379040A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of preparation of polymer-based composite materials, and particularly relates to an anisotropic carbon fiber reinforced epoxy resin composite material and a preparation method thereof. BACKGROUND
[0002] Epoxy resin refers to an organic polymer compound containing two or more epoxy groups in the molecule. Due to its high hardness, good flexibility, small curing shrinkage, strong adhesion and easy processing, it is widely used in the fields of automobiles, buildings, electronics, aerospace and thermosetting materials. However, the cured epoxy resin has a large crosslinking density, low toughness, high brittleness, easy cracking and poor conductivity, which limits its application range. Epoxy resin is the most common base resin material for anisotropic conductive adhesive, which requires good rigidity, toughness and anisotropic conductivity.
[0003] Therefore, the prior art needs to be improved. SUMMARY
[0004] The present application relates to an anisotropic carbon fiber reinforced epoxy resin composite material and a preparation method thereof. The carbon fiber epoxy composite material of the present application has good rigidity, toughness and anisotropic conductivity.
[0005] The present application is realized by the following technical solutions:
[0006] In a first aspect, the present application provides an anisotropic carbon fiber reinforced epoxy resin composite material, comprising an epoxy resin matrix material and surface-modified nickel microneedle short carbon fibers distributed in the epoxy resin matrix material.
[0007] The mass percentage content of the surface-modified nickel microneedle short carbon fibers in the epoxy resin matrix material is 0.1-20%.
[0008] Optionally, the surface-modified nickel microneedle short carbon fibers are prepared by the following method:
[0009] Dissolve nickel salt and sodium citrate dihydrate in deionized water to form a mixed solution;
[0010] Adjust the pH of the mixed solution to 12-14, and then add short carbon fibers;
[0011] Then add hydrazine hydrate, and finally react at 60-90℃ for 1-12h to obtain the surface-modified nickel microneedle short carbon fibers.
[0012] Optionally, the nickel salt is nickel chloride hexahydrate, nickel sulfate heptahydrate or nickel nitrate.
[0013] Optionally, the mass-volume ratio of the nickel salt, sodium citrate dihydrate, short carbon fibers, and hydrazine hydrate is 1-10 g: 1-20 g: 0.1-2.0 g: 5-100 ml.
[0014] Optionally, the length of the short carbon fibers is 0.5-5 mm.
[0015] Optionally, the pH value of the mixed solution is adjusted with NaOH solid.
[0016] In a second aspect, the present application provides a preparation method of an anisotropic carbon fiber reinforced epoxy resin composite material, comprising the following steps performed in sequence:
[0017] The short carbon fibers with surface-modified nickel microneedles are ultrasonically dispersed with anhydrous ethanol for 1-8 h to obtain a suspension of the short carbon fibers with surface-modified nickel microneedles and anhydrous ethanol,
[0018] The obtained suspension of the short carbon fibers with surface-modified nickel microneedles and anhydrous ethanol and the epoxy resin are stirred at 75-85°C while vacuum is applied for 5-25 h, then a curing agent is added, and after uniform stirring, the mixture is poured into a mold, then magnets are placed above and below the mold until the material is cured at room temperature, thereby obtaining the anisotropic carbon fiber reinforced epoxy resin composite material.
[0019] Optionally, the weight ratio of the short carbon fibers with surface-modified nickel microneedles and anhydrous ethanol in the suspension is 0.1-30:100.
[0020] Optionally, the power during ultrasonic treatment is 100-1000 W.
[0021] Compared with the prior art, the present application has the following beneficial effects:
[0022] The anisotropic carbon fiber reinforced epoxy resin composite material of the present application contains short carbon fibers with surface-modified nickel microneedles, which can not only be uniformly dispersed in the epoxy resin matrix material but also be orientedly distributed in the epoxy resin matrix material, thereby forming a conductive path in the epoxy resin matrix material and further having a high electrical conductivity; and the strength, modulus, and toughness of the composite material are improved. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 Scanning electron microscope image of the short carbon fibers with surface-modified nickel microneedles of Example 1. DETAILED DESCRIPTION
[0024] The existing epoxy resin has a large crosslinking density after curing, low material toughness, high brittleness, easy cracking, and poor electrical conductivity, which limits its application range. Epoxy resin is the most common matrix resin material for anisotropic conductive adhesive. It is required to have good rigidity, toughness, and anisotropic conductivity.
[0025] Based on this, the embodiment provides an anisotropic carbon fiber reinforced epoxy resin composite material, which comprises an epoxy resin matrix material and surface-modified nickel microneedle chopped carbon fibers oriented and distributed in the epoxy resin matrix material.
[0026] The mass percentage of the surface-modified nickel microneedle chopped carbon fibers in the epoxy resin matrix material is 0.1-20%.
[0027] It should be noted that the anisotropic carbon fiber reinforced epoxy resin composite material of the embodiment contains surface-modified nickel microneedle chopped carbon fibers, which can not only be uniformly dispersed in the epoxy resin matrix material, but also be oriented and distributed in the epoxy resin matrix material due to the magnetic property, so as to form a conductive path in the epoxy resin matrix material, thereby having a higher conductivity, and improving the strength, modulus and toughness of the composite material.
[0028] In an embodiment, the surface-modified nickel microneedle chopped carbon fibers are prepared by the following method:
[0029] The nickel salt and sodium citrate dihydrate are dissolved in deionized water to form a mixed solution;
[0030] The pH of the mixed solution is adjusted to 12-14, and then the chopped carbon fibers are added;
[0031] Then hydrazine hydrate is added, and finally the reaction is carried out at 60-90°C for 1-12h to obtain the surface-modified nickel microneedle chopped carbon fibers.
[0032] In some embodiments, the nickel salt is nickel chloride hexahydrate, nickel sulfate heptahydrate or nickel nitrate.
[0033] In some embodiments, the mass-volume ratio of the nickel salt, sodium citrate dihydrate, chopped carbon fibers, and hydrazine hydrate is 1-10g:1-20g:0.1-2.0g:5-100ml.
[0034] In some embodiments, the length of the chopped carbon fibers is 0.5-5mm.
[0035] In some embodiments, the pH of the mixed solution is adjusted with NaOH solid.
[0036] It should be noted that after the nickel chloride hexahydrate and sodium citrate dihydrate are dissolved in deionized water to form a mixed solution, it is necessary to stand for 10-100min first. When the pH of the mixed solution is adjusted with NaOH solid, it needs to be added in small amounts and multiple times. After the reaction is completed, the beaker should be taken out immediately, and the sample should be repeatedly washed to make it clean. After washing, it is dried in a 60-100°C oven.
[0037] The embodiment also provides a preparation method of the anisotropic carbon fiber reinforced epoxy resin composite material, comprising the following steps performed in sequence:
[0038] The surface-modified nickel microneedle short-cut carbon fiber is ultrasonically dispersed in anhydrous ethanol for 1-8 hours to obtain a suspension of the surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol,
[0039] The obtained suspension of the surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol and the epoxy resin are stirred at 75-85°C while vacuumizing for 5-25 hours, then a curing agent is added, and after uniform stirring, the mixture is poured into a mold, then magnets are added to the upper and lower sides of the mold until the material is solidified at room temperature, and thus the anisotropic carbon fiber reinforced epoxy resin composite material is obtained.
[0040] It should be noted that, in the embodiment, the surface-modified nickel microneedle short-cut carbon fiber is dispersed in anhydrous ethanol first, then mixed with the epoxy resin, and finally magnets are added to the upper and lower sides of the mold, which can make the surface-modified nickel microneedle short-cut carbon fiber form an oriented distribution in the epoxy resin.
[0041] In some embodiments, the weight ratio of the surface-modified nickel microneedle short-cut carbon fiber to anhydrous ethanol in the suspension is 0.1-30:100.
[0042] In some preferred embodiments, the weight ratio of the surface-modified nickel microneedle short-cut carbon fiber to anhydrous ethanol in the suspension is 1-10:100.
[0043] In some embodiments, the power during ultrasonic treatment is 100-1000W.
[0044] The application is further described in conjunction with the specific embodiments below.
[0045] Embodiment 1
[0046] 1. Preparation of surface-modified nickel microneedle short-cut carbon fiber:
[0047] (1) 1g of nickel chloride hexahydrate and 1g of sodium citrate dihydrate were dissolved in 50ml of deionized water, and the solution was allowed to stand for 10min;
[0048] (2) A small amount of NaOH solid was added to the solution in step (1) for several times to adjust the pH of the solution to 14, and then 0.1g of short-cut carbon fiber was added to the solution;
[0049] (3) 5ml of hydrazine hydrate was slowly added to the solution in step (2), and then the solution was placed in a water bath to be heated to 60°C for 1 hour;
[0050] (4) After the reaction is completed, repeatedly wash, and after washing, put into a 60°C oven to dry, to obtain the surface modified nickel microneedle short carbon fiber.
[0051] The scanning electron microscope image of the surface modified nickel microneedle short carbon fiber obtained in this example is shown in FIG. 1. Figure 1 As can be seen from the figure, the carbon fiber surface is uniformly coated with the needle-shaped nickel structure.
[0052] 2. Preparation of anisotropic carbon fiber reinforced epoxy resin composite material:
[0053] The surface modified nickel microneedle short carbon fiber obtained is ultrasonically dispersed with anhydrous ethanol under the condition of a power of 100 W for 1 h to obtain a suspension of surface modified nickel microneedle short carbon fiber and anhydrous ethanol, and the weight ratio of the surface modified nickel microneedle short carbon fiber and anhydrous ethanol in the suspension is 0.1:100.
[0054] The suspension of surface modified nickel microneedle short carbon fiber and anhydrous ethanol obtained and the epoxy resin are stirred at 75°C while vacuumizing for 5 h, then a curing agent is added, and after uniform stirring, poured into a mold, then a magnet is added above and below the mold until room temperature curing, to obtain an anisotropic carbon fiber reinforced epoxy resin composite material. The weight ratio of the epoxy resin (containing a curing agent) of this example to the surface modified nickel microneedle short carbon fiber and anhydrous ethanol in the suspension is 100:0.1:100.
[0055] The conductivity of the composite material obtained in Example 1 in the orientation direction of the carbon fiber is 996 s / cm; the tensile strength is 81 MPa; and the tensile modulus is 2.9 GPa.
[0056] Example 2
[0057] 1. Preparation of surface modified nickel microneedle short carbon fiber:
[0058] (1) 10 g of nickel chloride hexahydrate and 20 g of sodium citrate dihydrate are dissolved in 500 ml of deionized water, and left to stand for 100 min;
[0059] (2) A small amount of NaOH solid is added to the solution in step (1) for several times, the pH of the solution is adjusted to 14, and then 2.0 g of short carbon fiber is added to the solution;
[0060] (3) 100 ml of hydrazine hydrate is slowly added to the solution in step (2), and then the solution is placed in a water bath to be heated to 90°C, and then reacted for 12 hours;
[0061] (4) After the reaction is completed, repeatedly wash, and after washing, put into a 100°C oven to dry.
[0062] 2. Preparation of anisotropic carbon fiber reinforced epoxy resin composite material:
[0063] The obtained surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol were ultrasonically dispersed under the condition of a power of 1000 W for 8 h to obtain a suspension of surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol, and the weight ratio of the surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol in the suspension was 30:100.
[0064] The obtained suspension of surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol and epoxy resin were stirred at 85°C while vacuumizing for 25 h, then a curing agent was added, and after uniform stirring, poured into a mold, then magnets were added above and below the mold until room temperature curing, and then an anisotropic carbon fiber reinforced epoxy resin composite material was obtained. The weight ratio of the epoxy resin (containing a curing agent) of this embodiment to the surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol in the suspension was 100:30:100.
[0065] The conductivity of the composite material obtained in this embodiment 2 in the orientation direction of the carbon fiber was 5237 s / cm, the tensile strength was 127 MPa, and the tensile modulus was 3.7 GPa.
[0066] Example 3
[0067] 1. Preparation of surface-modified nickel microneedle short-cut carbon fiber:
[0068] (1) 3 g of nickel chloride hexahydrate and 6 g of sodium citrate dihydrate were dissolved in 100 ml of deionized water, and the solution was allowed to stand for 20 min;
[0069] (2) A small amount of NaOH solid was added to the solution in step (1) in multiple times, the pH of the solution was adjusted to 14, and then 0.3 g of short-cut carbon fiber was added to the solution;
[0070] (3) 20 ml of hydrazine hydrate was slowly added to the solution in step (2), and then the solution was placed in a water bath to be heated to 80°C, and then reacted for 2 hours;
[0071] (4) After the reaction was completed, repeated washing was performed, and after the washing was completed, the solution was placed in an 80°C oven for drying.
[0072] 2. Preparation of an anisotropic carbon fiber reinforced epoxy resin composite material:
[0073] The obtained surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol were ultrasonically dispersed under the condition of a power of 500 W for 6 h to obtain a suspension of surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol, and the weight ratio of the surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol in the suspension was 10:100.
[0074] The suspension of the surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol and the epoxy resin obtained is stirred at 80°C while vacuuming for 15h, then a curing agent is added, and after stirring evenly, it is poured into a mold, then magnets are added above and below the mold until it is cured at room temperature, and then an anisotropic carbon fiber reinforced epoxy resin composite material is obtained. The weight ratio of the epoxy resin (containing a curing agent) of this embodiment to the surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol in the suspension is 100:10:100.
[0075] The conductivity of the composite material obtained in this embodiment 3 in the orientation direction of the carbon fiber is 2121s / cm; the tensile strength is 93MPa; and the tensile modulus is 3.1GPa.
[0076] Embodiment 4
[0077] 1. Preparation of surface-modified nickel microneedle short-cut carbon fiber:
[0078] (1) 5g of nickel chloride hexahydrate and 10g of sodium citrate dihydrate are dissolved in 300ml of deionized water, and then left to stand for 60min;
[0079] (2) A small amount of NaOH solid is added to the solution in step (1) for several times to adjust the pH of the solution to 14, and then 0.5g of short-cut carbon fiber is added to the solution;
[0080] (3) 40ml of hydrazine hydrate is slowly added to the solution in step (2), and then the solution is placed in a water bath to be heated to 80°C for 10h;
[0081] (4) After the reaction is completed, repeated washing is performed, and then the washed product is placed in an oven at 90°C for drying.
[0082] 2. Preparation of an anisotropic carbon fiber reinforced epoxy resin composite material:
[0083] The surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol obtained are ultrasonically dispersed for 6h under the condition of a power of 300W to obtain a suspension of surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol, and the weight ratio of the surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol in the suspension is 10:100.
[0084] The suspension of the surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol obtained and the epoxy resin are stirred at 85°C while vacuuming for 5h, then a curing agent is added, and after stirring evenly, it is poured into a mold, then magnets are added above and below the mold until it is cured at room temperature, and then an anisotropic carbon fiber reinforced epoxy resin composite material is obtained. The weight ratio of the epoxy resin (containing a curing agent) of this embodiment to the surface-modified nickel microneedle short-cut carbon fiber and anhydrous ethanol in the suspension is 100:10:100.
[0085] The conductivity of the composite material obtained in this embodiment 4 in the orientation direction of the carbon fibers is 3245 s / cm; the tensile strength is 106 MPa; and the tensile modulus is 3.3 GPa.
[0086] Embodiment 5
[0087] 1. Preparation of surface-modified nickel microneedle short carbon fibers:
[0088] (1) 7 g of nickel chloride hexahydrate and 15 g of sodium citrate dihydrate were dissolved in 400 ml of deionized water, and the solution was allowed to stand for 60 min;
[0089] (2) A small amount of NaOH solid was added to the solution in step (1) in multiple times, the pH of the solution was adjusted to 14, and then 1.5 g of short carbon fibers was added to the solution;
[0090] (3) 48 ml of hydrazine hydrate was slowly added to the solution in step (2), and then the solution was placed in a water bath to be heated to 80°C and reacted for 8 hours;
[0091] (4) After the reaction was completed, repeated washing was performed, and after the washing was completed, the solution was placed in an 80°C oven for drying.
[0092] 2. Preparation of anisotropic carbon fiber reinforced epoxy resin composite material:
[0093] The surface-modified nickel microneedle short carbon fibers obtained were ultrasonically dispersed with ethanol in a power of 400 W for 5 h to obtain a suspension of surface-modified nickel microneedle short carbon fibers and ethanol, and the weight ratio of the surface-modified nickel microneedle short carbon fibers to ethanol in the suspension was 20:100.
[0094] The obtained suspension of surface-modified nickel microneedle short carbon fibers and ethanol and the epoxy resin were stirred at 85°C while being vacuumed for 15 h, then a curing agent was added, and after the stirring was completed, the mixture was poured into a mold, then magnets were added above and below the mold until the material was cured at room temperature, and thus an anisotropic carbon fiber reinforced epoxy resin composite material was obtained. The weight ratio of the epoxy resin (containing the curing agent) to the surface-modified nickel microneedle short carbon fibers and ethanol in the suspension in this embodiment was 100:20:100.
[0095] The conductivity of the composite material obtained in this embodiment 5 in the orientation direction of the carbon fibers is 4450 s / cm; the tensile strength is 116 MPa; and the tensile modulus is 3.6 GPa.
[0096] Embodiment 6
[0097] 1. Preparation of surface-modified nickel microneedle short carbon fibers:
[0098] (1) 3g of nickel chloride hexahydrate and 6g of sodium citrate dihydrate were dissolved in 200ml of deionized water, and left to stand for 50min;
[0099] (2) NaOH solid was added to the solution of step (1) in small amounts for several times to adjust the pH of the solution to 14, and then 1.5g of short carbon fibers were added to the above solution;
[0100] (3) 60ml of hydrazine hydrate was slowly added to the solution of step (2), and then the solution was placed in a water bath to be heated to 80℃ and reacted for 3 hours;
[0101] (4) After the reaction was completed, repeated washing was performed, and after being cleaned, it was placed in an 80℃ oven for drying.
[0102] 2. Preparation of anisotropic carbon fiber reinforced epoxy resin composite material:
[0103] The short carbon fibers with surface modified nickel microneedles and anhydrous ethanol were ultrasonically dispersed under the condition of a power of 300W for 5h to obtain a suspension of short carbon fibers with surface modified nickel microneedles and anhydrous ethanol, and the weight ratio of the short carbon fibers with surface modified nickel microneedles and anhydrous ethanol in the suspension was 10:100.
[0104] The obtained suspension of short carbon fibers with surface modified nickel microneedles and anhydrous ethanol and epoxy resin were stirred at 80℃ while being vacuumed for 12h, then a curing agent was added, and after being uniformly stirred, it was poured into a mold, then magnets were added above and below the mold until it was solidified at room temperature, and thus an anisotropic carbon fiber reinforced epoxy resin composite material was obtained. The weight ratio of the epoxy resin (containing the curing agent) of this embodiment to the short carbon fibers with surface modified nickel microneedles and anhydrous ethanol in the suspension was 100:10:100.
[0105] The conductivity of the composite material obtained in this embodiment 6 in the orientation direction of the carbon fibers was 4450s / cm, the tensile strength was 116MPa, and the tensile modulus was 3.6GPa.
[0106] Comparative Example 1
[0107] Compared with Example 6, no magnetic field was added in this comparative example.
[0108] 1. Preparation of short carbon fibers with surface modified nickel microneedles:
[0109] (1) 3g of nickel chloride hexahydrate and 6g of sodium citrate dihydrate were dissolved in 200ml of deionized water, and left to stand for 50min;
[0110] (2) NaOH solid was added to the solution of step (1) in small amounts for several times to adjust the pH of the solution to 14, and then 1.5g of short carbon fibers were added to the above solution;
[0111] (3) Slowly add 60 ml of hydrazine hydrate to the solution from step (2), then place it in a water bath to warm up to 80°C and react for 3 hours;
[0112] (4) After the reaction is completed, repeatedly clean it, and after cleaning, place it in an 80°C oven to dry.
[0113] 2. Composite material preparation:
[0114] The obtained surface-modified nickel microneedle short carbon fibers and anhydrous ethanol were ultrasonically dispersed under the condition of a power of 300 W for 5 h to obtain a suspension of surface-modified nickel microneedle short carbon fibers and anhydrous ethanol, and the weight ratio of the surface-modified nickel microneedle short carbon fibers to anhydrous ethanol in the suspension was 10:100.
[0115] The obtained suspension of surface-modified nickel microneedle short carbon fibers and anhydrous ethanol and epoxy resin were stirred at 80°C while being vacuumed for 12 h, then a curing agent was added, and after being uniformly stirred, it was poured into a mold, and after being cured at room temperature, a carbon fiber reinforced epoxy resin composite material was obtained. The weight ratio of the epoxy resin (containing the curing agent) to the surface-modified nickel microneedle short carbon fibers and anhydrous ethanol in the suspension in this comparative example was 100:10:100.
[0116] The conductivity of the composite material obtained in Comparative Example 1 was 0.23 s / cm; the tensile strength was 66 MPa; and the tensile modulus was 2.1 GPa.
[0117] Comparative Example 2
[0118] This comparative example is compared with Comparative Example 1 as a blank.
[0119] Composite material preparation:
[0120] (1) The unmodified nickel microneedle short carbon fibers and anhydrous ethanol were ultrasonically dispersed under the condition of a power of 300 W for 5 h to obtain a suspension of short carbon fibers and anhydrous ethanol, and the weight ratio of the short carbon fibers to anhydrous ethanol in the suspension was 10:100.
[0121] (2) The suspension of short carbon fibers and anhydrous ethanol obtained in step (1) and epoxy resin were stirred at 80°C while being vacuumed for 12 h, then a curing agent was added, and after being uniformly stirred, it was poured into a mold, and after being cured at room temperature, a carbon fiber reinforced epoxy resin composite material was obtained. The weight ratio of the epoxy resin (containing the curing agent) to the surface-modified nickel microneedle short carbon fibers and anhydrous ethanol in the suspension in this comparative example was 100:10:100.
[0122] The conductivity of the composite material obtained in Comparative Example 2 was 0.02 s / cm; the tensile strength was 61 MPa; and the tensile modulus was 2.1 GPa.
[0123] The manufacturer model of the epoxy resin in the above embodiment: E-51 epoxy resin: Haining Hailong Chemical Co., Ltd.
[0124] The manufacturer model of the curing agent in the above embodiment: 593 curing agent: Suzhou Qicai Shi Composite Material Co., Ltd.
[0125] In conclusion, the present application provides an anisotropic carbon fiber reinforced epoxy resin composite material and a preparation method thereof, the anisotropic carbon fiber reinforced epoxy resin composite material contains the chopped carbon fiber with surface modified nickel microneedle, the chopped carbon fiber with surface modified nickel microneedle can be uniformly dispersed in the epoxy resin matrix material, and can be distributed in the epoxy resin matrix material in an oriented manner by adopting a magnetic field, and further has a higher conductivity; so that a conductive path can be formed in the epoxy resin matrix material, and the strength, modulus and toughness of the composite material are improved.
[0126] The present application is not limited to the above embodiments, and any improvement and replacement made according to the principle of the present application is within the protection scope of the present application.
Claims
1. An anisotropic carbon fiber reinforced epoxy resin composite material, characterized in that: it comprises an epoxy resin matrix material and chopped carbon fibers with surface-modified nickel microneedles oriented and distributed in the epoxy resin matrix material; the mass percentage of the chopped carbon fibers with surface-modified nickel microneedles in the epoxy resin matrix material is 0.1-20%. The chopped carbon fibers with surface-modified nickel microneedles are prepared by the following method: dissolving a nickel salt and sodium citrate dihydrate in deionized water to form a mixed solution; 2. The anisotropic carbon fiber reinforced epoxy resin composite material according to claim 1, characterized by: adjusting the pH of the mixed solution to 12-14, then adding chopped carbon fibers; then adding hydrazine hydrate, and finally reacting at 60-90℃ for 1-12h to obtain the chopped carbon fibers with surface-modified nickel microneedles. The nickel salt is nickel chloride hexahydrate, nickel sulfate heptahydrate or nickel nitrate. The mass-volume ratio of the nickel salt, sodium citrate dihydrate, chopped carbon fibers, and hydrazine hydrate is 1-10g:1-20g:0.1-2.0g:5-100ml.
3. An anisotropic carbon fiber reinforced epoxy resin composite material according to claim 2, characterized by: The length of the chopped carbon fibers is 0.5-5mm.
4. The anisotropic carbon fiber reinforced epoxy resin composite material according to claim 2, characterized by: The pH of the mixed solution is adjusted with NaOH solid.
5. The anisotropic carbon fiber reinforced epoxy resin composite material according to claim 2, characterized by: It comprises the following steps in sequence:
6. The anisotropic carbon fiber reinforced epoxy resin composite material according to claim 2, characterized by: ultrasonically dispersing the chopped carbon fibers with surface-modified nickel microneedles in anhydrous ethanol for 1-8h to obtain a suspension of the chopped carbon fibers with surface-modified nickel microneedles and anhydrous ethanol, 7. A process for the production of an anisotropic carbon fiber reinforced epoxy resin composite according to any one of claims 1 to 6, characterized in that stirring the obtained suspension of the chopped carbon fibers with surface-modified nickel microneedles and anhydrous ethanol and epoxy resin at 75-85℃ while vacuumizing for 5-25h, then adding a curing agent, stirring uniformly, then pouring into a mold, then placing magnets on both sides of the mold until room temperature curing, and then obtaining the anisotropic carbon fiber reinforced epoxy resin composite material. The weight ratio of the chopped carbon fibers with surface-modified nickel microneedles and anhydrous ethanol in the suspension is 0.1-30:
100. The power during ultrasonic treatment is 100-1000W.
8. The method for preparing anisotropic carbon fiber reinforced epoxy resin composite material according to claim 7, characterized in that, 9. The method for preparing anisotropic carbon fiber reinforced epoxy resin composite material according to claim 7, characterized in that,