High-toughness ionic gel carbon fiber composite material and preparation method thereof

Abstract

The application discloses a high-toughness ionic gel carbon fiber composite material and a preparation method and application thereof. The composite material is prepared from carbon fiber fabric, acrylic acid or ester compounds, amide compounds and ionic liquid as raw materials through in-situ radical polymerization by a one-pot method. The precursor solution can be well infiltrated into the fiber bundle of the carbon fiber fabric due to the good compatibility between the acrylic acid and ester compounds and the imidazole ionic liquid, and the carbon fiber fabric can be effectively toughened after polymerization, so that the obtained composite material has excellent tensile strength and tear resistance, and has a wide application prospect in the field of intelligent robots.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high polymer materials, and particularly relates to a novel ionic gel carbon fiber composite material, and especially relates to an ionic gel fiber composite material with high toughness and a preparation method thereof. BACKGROUND

[0002] In recent years, artificial intelligence robots have entered the public view, and the development of the industry can reduce labor costs, improve labor intensity, and bring convenience to various industries. In the field of robots and industry, a bendable structural material is often needed, which needs to bear a considerable load when stretched. At present, soft fiber reinforced polymer materials composed of hydrogel, rubber matrix and other elastomers and rigid fabric have high strength when stretched and allow bending deformation under bending or twisting, and are widely used in industry. However, due to interfacial delamination, the existing soft fiber reinforced polymer materials have low fracture energy and weak crack propagation resistance, which greatly increases the risk of failure during use, limits the actual application space, and developing a soft material that is both strong and tough is still a challenge.

[0003] The commonly used high-stability room-temperature ionic liquid mainly includes imidazole ionic liquid and pyridine ionic liquid. Among them, the imidazole ionic liquid is widely used in the design and preparation of ionic gels due to its simple synthesis, good stability and moderate price. The fiber bundle of carbon fiber fabric shows strong anisotropy and can bear high load, and there is strong van der Waals interaction between the filaments, so the carbon fiber fabric has very high strength, but there are a large number of gaps between the fiber bundles, resulting in poor toughness. However, the surface of the carbon fiber bundle is highly polar and has a large number of negative charges, and the precursor solution containing ionic liquid contains a large number of cations, so the electrostatic interaction between the two enables the precursor solution to be well wetted and soaked into the fiber bundle. After free radical polymerization, the fiber surface is covered, the gaps in the fiber bundle are filled with ionic gel matrix, and a continuous structure is formed, so that the ionic gel matrix can well synergistically toughen the carbon fiber fabric, and the prepared ionic gel carbon fiber composite material has very high strength and toughness.

[0004] The present application uses acrylic acid and its ester compounds, amide monomers and imidazole ionic liquid as raw materials to synthesize a soft fiber composite material with strong interfacial interlocking structure by photo-induced polymerization in the presence of carbon fiber fabric. The composite material has excellent mechanical properties, thereby greatly expanding its application range. SUMMARY

[0005] The present application aims to provide a high-toughness ionic gel carbon fiber composite material and a preparation method thereof, which has excellent tensile and tear resistance, can overcome the problem of limited mechanical properties of soft fiber composites, and has a wide application prospect in the field of intelligent robots.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A high-toughness ionic gel carbon fiber composite material is prepared by using an amide compound and an acrylic acid or an ester compound as reaction monomers, in-situ radical polymerization reaction of the reaction monomers in an ionic liquid through a photo initiator "one-pot method", and compounding the obtained ionic gel with a carbon fiber fabric during the polymerization process. The preparation specifically comprises uniformly mixing and stirring the amide compound, the acrylic acid or the ester compound, an imidazole ionic liquid, and a photo initiator to form a transparent precursor solution; then, the precursor solution is injected into a hollow mold with the carbon fiber fabric sandwiched therein, and the ionic gel carbon fiber composite material is obtained by ultraviolet light irradiation for 3-5 hours.

[0008] Further, the amide compound is any one or two of acrylamide, methacrylamide, N-isopropyl acrylamide, N-methyl-2-acrylamide, N-ethyl acrylamide, and 3-butenamide, and is preferably acrylamide.

[0009] Further, the acrylic ester compound used is any one or two of methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, trifluoroethyl acrylate, 2,2,3,3,3,-pentafluoropropyl acrylate, phenylethyl acrylate, n-butyl methacrylate, hexyl methacrylate, and trifluoroethyl methacrylate.

[0010] Further, the imidazole ionic liquid is any one of 1-ethyl-3-methylimidazole trifluoromethanesulfonate, 1-ethyl-3-methylimidazole chloride, and 1-ethyl-3-methylimidazole ethyl sulfate, and is preferably 1-ethyl-3-methylimidazole trifluoromethanesulfonate.

[0011] Further, the mass ratio of the imidazole ionic liquid to the reaction monomers is 2-7:3, and the mass ratio of the acrylic acid or the ester compound to the amide compound in the reaction monomers is 4-19:1.

[0012] There is a conflict between strength and toughness in the ionic gel polymer network. When the concentration of the amide compound is high, the ionic gel becomes hard but also brittle, and the toughness is low. When the concentration of the amide compound is low, the ionic gel becomes soft but also tough. Therefore, the mechanical properties of the ionic gel can be regulated by reasonably adjusting the ratio of the two.

[0013] Further, the photoinitiator is alpha-hydroxyisobutyrylbenzene, and the amount of the photoinitiator is 1:0.1-10 molar ratio of the amount of the photoinitiator to the amount of the reaction monomer used -4 , preferably 1:10 -3 .

[0014] Further, the hollow mold with the carbon fiber fabric includes a first glass layer, a second glass layer, a first FEP film layer and a second FEP film layer between the first glass layer and the second glass layer, and a first annular co-rubber layer and a second annular co-rubber layer between the first FEP film layer and the second FEP film layer, and the carbon fiber fabric is arranged between the first annular co-rubber layer and the second annular co-rubber layer, and a containing cavity for containing the precursor solution is formed in the inner circumferential surface of the annular co-rubber layer, and a hole for injecting the precursor solution into the containing cavity is arranged on the annular co-rubber layer. Under the preferred conditions, the ionic gel carbon fiber composite material has excellent tensile resistance and tear resistance.

[0015] The high-toughness ionic gel carbon fiber composite material obtained by the application can be used to prepare ligaments of intelligent robots.

[0016] The application designs the main chain structure of the polymer network of the ionic gel, selects appropriate hard segment and soft segment monomers, and realizes a certain flexibility of the main chain by changing the ratio of the two, to prepare an ionic gel carbon fiber composite material with excellent tear resistance and adjustable mechanical properties. Because the surface of the carbon fiber bundle is highly polar and has a large number of negative charges, and the precursor solution containing ionic liquid contains a large number of cations, the electrostatic interaction between the two enables the precursor solution to be well wetted and soaked into the fiber bundle. After free radical polymerization, the fiber surface is covered, and the gap in the fiber bundle is filled with ionic gel matrix to form a continuous structure, so that the carbon fiber composite material has very high toughness. Acrylic acid and its ester compounds have good compatibility with imidazole-based ionic liquids, and can form a homogeneous polyacrylic acid ionic gel network, while acrylamide has poor compatibility with imidazole-based ionic liquids, so that the amide group forms hydrogen bonds during polymerization. Based on the difference in solubility, in-situ phase separation occurs to form a bicontinuous network in the copolymer ionic gel, thereby preparing an ionic gel with excellent mechanical properties and the ability to synergistically toughen the carbon fiber fabric. By changing the content of the ionic liquid, the strength of the interaction between the ionic gel and the substrate can be changed, thereby regulating the mechanical properties.

[0017] The selected monomers in the application are low in price, simple in process, high in controllability, do not require expensive equipment, and can be produced on a large scale. The obtained ionic gel carbon fiber composite material has excellent tensile properties, high breaking strength and excellent tear resistance, and can be applied in the field of intelligent robots and has broad application prospects.

[0018] The beneficial effects of the application are reflected in:

[0019] (1) The ion gel carbon fiber composite material provided in the present application has simple preparation process, high controllability, does not need expensive equipment, has low raw material price, and is easy to mass produce.

[0020] (2) The high-toughness ion gel carbon fiber composite material involved in the present application can exhibit strong anisotropy, can withstand high load, and has extremely strong tear resistance, but can still be easily bent like a common elastomer, realizing the preparation and application of a new type of high-performance ion gel multifunctional composite material.

[0021] (3) The ion gel fiber composite material prepared in the present application has a tensile strength of 250-400 MPa, a toughness of 950-2200 KJ / m 2 , and a fracture energy of 30-44 KJ / m 3 . BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure diagram of a hollow mold used in the present application and clamping carbon fiber fabric.

[0023] Figure 2 It is a stress-strain curve diagram of the ion gel prepared in Examples 1-7.

[0024] Figure 3 It is a stress-strain curve diagram of the ion gel carbon fiber composite material prepared in Examples 8-14.

[0025] Figure 4 It is a fracture energy diagram of the ion gel carbon fiber composite material prepared in Examples 8-14.

[0026] Figure 5 It is a toughness tear energy diagram of the ion gel carbon fiber composite material prepared in Examples 8-14.

[0027] Figure 6 It is an SEM diagram of the fracture section of the original carbon fiber fabric (a) and the ion gel carbon fiber composite material (b) prepared in Example 9 after drawing.

[0028] Figure 7 It is a stress-strain curve comparison diagram of the original carbon fiber fabric, the ion gel prepared in Example 2, and the ion gel carbon fiber composite material prepared in Example 9.

[0029] Figure 8 It is a tear energy toughness comparison diagram of the original carbon fiber fabric, the ion gel prepared in Example 2, and the ion gel prepared in Example 9. DETAILED DESCRIPTION

[0030] A high-toughness ionic gel carbon fiber composite material is prepared by mixing and stirring an amide compound, an acrylic acid or ester compound, an imidazole ionic liquid and a photoinitiator to form a transparent precursor solution, and then injecting the solution into a hollow mold with carbon fiber fabric, and irradiating with ultraviolet light for 3-5 hours to obtain the ionic gel carbon fiber composite material.

[0031] The amide compound is any one or two of acrylamide, methacrylamide, N-isopropyl acrylamide, N-methyl-2-acrylamide, N-ethyl acrylamide and 3-butenamide.

[0032] The acrylic ester compound is any one or two of methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, trifluoroethyl acrylate, 2,2,3,3,3-pentafluoropropyl acrylate, phenylethyl acrylate, n-butyl methacrylate, hexyl methacrylate and trifluoroethyl methacrylate.

[0033] The imidazole ionic liquid is any one of 1-ethyl-3-methylimidazole triflate, 1-ethyl-3-methylimidazole chloride and 1-ethyl-3-methylimidazole ethyl sulfate.

[0034] The mass ratio of the imidazole ionic liquid to the reaction monomer is 2-7:3, and the mass ratio of the acrylic acid or ester compound to the amide compound in the reaction monomer is 4-19:1.

[0035] The photoinitiator is α-hydroxyisobutyrylbenzene, and the molar ratio of the amount to the reaction monomer is 1:0.1-10 -4 , preferably 1:10 -3 .

[0036] As Figure 1 , the hollow mold with carbon fiber fabric includes a first glass layer, a second glass layer, a first FEP film layer and a second FEP film layer between the first glass layer and the second glass layer, and a first annular co-rubber layer and a second annular co-rubber layer between the first FEP film layer and the second FEP film layer, and the carbon fiber fabric is arranged between the first annular co-rubber layer and the second annular co-rubber layer, a receiving cavity for containing the precursor solution is formed in the inner wall of the annular rubber layer, and a hole for injecting the precursor solution into the receiving cavity is arranged on the annular rubber layer. The thickness of the receiving cavity is 0.5-1 mm.

[0037] The thickness of the annular rubber layer is 0.5-1 mm.

[0038] In order to make the content of the application more convenient to understand, the technical solutions of the application will be further described in combination with specific embodiments, but the application is not limited thereto.

[0039] Example 1

[0040] 2.56 g (35 mmol) of acrylic acid, 0.64 g (9 mmol) of acrylamide, 4.8 g (18 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, and 0.72 mg (0.004 mmol) of a photoinitiator a-hydroxyisobutyrylbenzene were stirred at room temperature to form a transparent solution, the solution was injected into a hollow mold (no carbon fiber fabric was added to the mold), and after UV irradiation for 3-5 h, an ionogel was peeled off from the hollow mold.

[0041] Example 2

[0042] 2.72 g (37 mmol) of acrylic acid, 0.48 g (7 mmol) of acrylamide, 4.8 g (18 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, and 0.72 mg (0.004 mmol) of a photoinitiator a-hydroxyisobutyrylbenzene were stirred at room temperature to form a transparent solution, the solution was injected into a hollow mold (no carbon fiber fabric was added to the mold), and after UV irradiation for 3-5 h, an ionogel was peeled off from the hollow mold.

[0043] Example 3

[0044] 2.88 g (40 mmol) of acrylic acid, 0.32 g (4 mmol) of acrylamide, 4.8 g (18 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, and 0.72 mg (0.004 mmol) of a photoinitiator a-hydroxyisobutyrylbenzene were stirred at room temperature to form a transparent solution, the solution was injected into a hollow mold (no carbon fiber fabric was added to the mold), and after UV irradiation for 3-5 h, an ionogel was peeled off from the hollow mold.

[0045] Example 4

[0046] 3.04 g (42 mmol) of acrylic acid, 0.16 g (2 mmol) of acrylamide, 4.8 g (18 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, and 0.72 mg (0.004 mmol) of a photoinitiator a-hydroxyisobutyrylbenzene were stirred at room temperature to form a transparent solution, the solution was injected into a hollow mold (no carbon fiber fabric was added to the mold), and after UV irradiation for 3-5 h, an ionogel was peeled off from the hollow mold.

[0047] Example 5

[0048] A mixture of 4.08 g (56 mmol) of acrylic acid, 0.72 g (10 mmol) of acrylamide, 3.2 g (12 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, 1.08 mg (0.006 mmol) of photoinitiator α-hydroxyisobutyrylbenzene was stirred at room temperature to form a transparent solution, the solution was injected into a hollow mold (no carbon fiber fabric was added into the mold), and an ionogel was obtained after UV irradiation for 3-5 h and peeling from the hollow mold.

[0049] Example 6

[0050] A mixture of 3.4 g (47 mmol) of acrylic acid, 0.6 g (8 mmol) of acrylamide, 4 g (15 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, 0.9 mg (0.005 mmol) of photoinitiator α-hydroxyisobutyrylbenzene was stirred at room temperature to form a transparent solution, the solution was injected into a hollow mold (no carbon fiber fabric was added into the mold), and an ionogel was obtained after UV irradiation for 3-5 h and peeling from the hollow mold.

[0051] Example 7

[0052] A mixture of 2.04 g (28 mmol) of acrylic acid, 0.36 g (5 mmol) of acrylamide, 5.6 g (21 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, 0.54 mg (0.003 mmol) of photoinitiator α-hydroxyisobutyrylbenzene was stirred at room temperature to form a transparent solution, the solution was injected into a hollow mold (no carbon fiber fabric was added into the mold), and an ionogel was obtained after UV irradiation for 3-5 h and peeling from the hollow mold.

[0053] Example 8

[0054] A mixture of 2.56 g (35 mmol) of acrylic acid, 0.64 g (9 mmol) of acrylamide, 4.8 g (18 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, 0.72 mg (0.004 mmol) of photoinitiator α-hydroxyisobutyrylbenzene was stirred at room temperature to form a transparent solution, the solution was injected into a hollow mold with carbon fiber fabric sandwiched therebetween, and an ionogel-carbon fiber composite material was obtained after UV irradiation for 3-5 h and peeling from the hollow mold.

[0055] Example 9

[0056] A mixture of 2.72 g (37 mmol) of acrylic acid, 0.48 g (7 mmol) of acrylamide, 4.8 g (18 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, and 0.72 mg (0.004 mmol) of a photoinitiator α-hydroxyisobutyrylbenzene is stirred at room temperature to form a transparent solution, the solution is injected into a hollow mold with carbon fiber fabric, and an ionogel carbon fiber composite material is obtained by peeling off the hollow mold after UV irradiation for 3-5 h.

[0057] Example 10

[0058] A mixture of 2.88 g (40 mmol) of acrylic acid, 0.32 g (4 mmol) of acrylamide, 4.8 g (18 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, and 0.72 mg (0.004 mmol) of a photoinitiator α-hydroxyisobutyrylbenzene is stirred at room temperature to form a transparent solution, the solution is injected into a hollow mold with carbon fiber fabric, and an ionogel carbon fiber composite material is obtained by peeling off the hollow mold after UV irradiation for 3-5 h.

[0059] Example 11

[0060] A mixture of 3.04 (42 mmol) of acrylic acid, 0.16 g (2 mmol) of acrylamide, 4.8 g (18 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, and 0.72 mg (0.004 mmol) of a photoinitiator α-hydroxyisobutyrylbenzene is stirred at room temperature to form a transparent solution, the solution is injected into a hollow mold with carbon fiber fabric, and an ionogel carbon fiber composite material is obtained by peeling off the hollow mold after UV irradiation for 3-5 h.

[0061] Example 12

[0062] A mixture of 4.08 g (56 mmol) of acrylic acid, 0.72 g (10 mmol) of acrylamide, 3.2 g (12 mmol) of 1-ethyl-3-methylimidazole-trifluoromethylsulfonamide, and 1.08 mg (0.006 mmol) of a photoinitiator α-hydroxyisobutyrylbenzene is stirred at room temperature to form a transparent solution, the solution is injected into a hollow mold with carbon fiber fabric, and an ionogel carbon fiber composite material is obtained by peeling off the hollow mold after UV irradiation for 3-5 h.

[0063] Example 13

[0064] 3.4 g (47 mmol) of acrylic acid, 0.6 g (8 mmol) of acrylamide, 4 g (15 mmol) of 1-ethyl-3-methylimidazolium-trifluoromethylsulfonamide, and 0.9 mg (0.005 mmol) of photoinitiator α-hydroxyisobutyrylbenzene were stirred and mixed at room temperature to form a transparent solution. The solution was injected into a hollow mold containing carbon fiber fabric. After irradiation with ultraviolet light for 3-5 h, the ion-gel carbon fiber composite material was obtained by peeling it off from the hollow mold.

[0065] Example 14

[0066] 2.04 g (28 mmol) of acrylic acid, 0.36 g (5 mmol) of acrylamide, 5.6 g (21 mmol) of 1-ethyl-3-methylimidazolium-trifluoromethylsulfonamide, and 0.54 mg (0.003 mmol) of photoinitiator α-hydroxyisobutyrylbenzene were stirred and mixed at room temperature to form a transparent solution. The solution was injected into a hollow mold containing carbon fiber fabric. After irradiation with ultraviolet light for 3-5 h, the ion-gel carbon fiber composite material was peeled off from the hollow mold.

[0067] The mass fraction (f) of acrylic acid in the two monomers and the mass fraction (IL) of the ionic liquid in the raw materials were adjusted separately. The tensile properties of the ionic gels obtained in Examples 1-7 were tested using a universal testing machine (Model C44 104), specifically, the stress-strain properties of the ionic gels obtained in Examples 1-7 were measured at a tensile rate of 100 mm / min. The results are as follows: Figure 2 .Depend on Figure 2 It can be seen that by changing the ratio of acrylic acid in the two monomers while keeping the ionic liquid content at 60% (a), and by changing the ionic liquid content while keeping the ratio of the two monomers at 0.85 (b), the tensile properties of the ionic gel are significantly altered. Furthermore, as the ionic liquid content decreases and the acrylamide ratio in the monomers increases, the tensile strength increases, reaching a maximum of 10 MPa, but the elongation at break decreases from 1400% to 450%, demonstrating that the ionic gel prepared using the raw material ratio of this invention has excellent mechanical properties.

[0068] The stress-strain properties of the ion-gel carbon fiber composites obtained in Examples 8-14 were measured using a microcomputer-controlled electronic universal testing machine (model: CMT5504) at a tensile rate of 100 mm / min. Figure 3 Tensile stress-strain curves and Figure 4the breaking energy of the ion gel carbon fiber composite material. It can be seen from the figure that when the proportion of the ionic liquid is fixed at 60%wt and the proportion of the monomer is 40%wt, the breaking energy of the ion gel carbon fiber composite material is not greatly affected as the proportion of acrylic acid in the monomer increases from 80% to 95%; while the proportion of acrylic acid and acrylamide is fixed at 85:15, the breaking energy of the ion gel carbon fiber composite material is greatly affected as the proportion of the ionic liquid increases from 40%wt to 70%wt, and the breaking energy of Example 9 is optimal.

[0069] The ion gel fiber composite material obtained in Example 8-14 was measured by using a microcomputer-controlled electronic universal testing machine (model: CMT5504) at a tensile rate of 50 mm / min, a trouser tear method was used, and the tear resistance toughness of the ion gel composite material was calculated by using the formula (wherein T is the tear resistance toughness, F is the integral area of the tear curve, t is the thickness of the sample, and L bulk is the tear path length of the sample) and the results are shown in Figure 5 . It can be seen from the figure that when the proportion of the ionic liquid is fixed at 60%wt and the proportion of the monomer is 40%wt, the toughness of the ion gel carbon fiber composite material is not greatly affected as the proportion of acrylic acid in the monomer increases from 80% to 95%; while the proportion of acrylic acid and acrylamide is fixed at 85:15, the toughness of the ion gel carbon fiber composite material is greatly affected as the proportion of the ionic liquid increases from 40%wt to 70%wt, and the toughness of Example 9 is optimal.

[0070] Figure 6 The SEM images of the fracture cross-sections of the original carbon fiber fabric and the ion gel carbon fiber composite material prepared in Example 9 after drawing. It can be observed from the figure that the matrix fiber bundles still maintain strong adhesion when the composite material fiber is broken and drawn. This phase structure hinders the propagation of cracks between the layers and gradually decomposes and absorbs energy, thereby achieving a synergistic toughening effect.

[0071] Figure 7 The stress-strain curves of the original carbon fiber fabric, the ion gel prepared in Example 2, and the ion gel carbon fiber composite material prepared in Example 9 are compared. It can be clearly found from Figure 7 that the tensile strength of the carbon fiber fabric after being combined with the ion gel is increased from 175MPa to 320MPa.

[0072] Figure 8 The stress-strain curves of the original carbon fiber fabric, the ion gel prepared in Example 2, and the ion gel carbon fiber composite material prepared in Example 9 are compared. It can be clearly found from Figure 8It can be obviously found that after the carbon fiber fabric is compounded with the ionic gel, the tear strength toughness is increased from 61.5 kJ / m 2 to 2200 kJ / m 2 It can be seen that through the synergistic toughening of the carbon fiber fabric and the ionic gel, the mechanical properties of the prepared new ionic gel carbon fiber composite material are very excellent.

[0073] The above merely describes the preferred embodiments of the present application, and any equivalent changes and modifications made within the scope of the present application should be included in the scope of the present application.

Claims

1. A method for preparing a high-toughness ionic gel carbon fiber composite material, characterized by: The amide compound, acrylic acid are used as reaction monomers, and in-situ radical polymerization is initiated by a photoinitiator in an ionic liquid, and the obtained ionic gel is compounded with carbon fiber fabric during the polymerization process, so that the ionic gel carbon fiber composite material is prepared; The amide compound is any one or two of acrylamide, methacrylamide, N-isopropyl acrylamide, N-methyl-2-acrylamide and N-ethyl acrylamide. The mass ratio of acrylic acid and the amide compound in the reaction monomers is 4-19:

1.

2. The method for preparing a high-toughness ion-gel carbon fiber composite material according to claim 1, characterized in that: Specifically, the amide compound, acrylic acid, imidazole ionic liquid and photoinitiator are uniformly mixed and stirred to form a transparent precursor solution; Then the precursor solution is injected into a hollow mold with carbon fiber fabric, and the ionic gel carbon fiber composite material is obtained by ultraviolet irradiation for 3-5 h.

3. The method of claim 2, wherein the ionic gel is prepared by mixing the carbon fiber and the ionic liquid at a temperature of 20 to 100°C. The imidazole ionic liquid is any one of 1-ethyl-3-methylimidazole triflate, 1-ethyl-3-methylimidazole chloride and 1-ethyl-3-methylimidazole ethyl sulfate.

4. The method of claim 2, wherein the ionic gel carbon fiber composite material has high toughness. The mass ratio of the imidazole ionic liquid and the reaction monomers used is 2-7:

3.

5. The method of claim 2, wherein the ionic gel carbon fiber composite material has high toughness. The photoinitiator is α-hydroxyisobutyrylbenzene, and the amount used is in a molar ratio of 0.1 to 10 relative to the reaction monomers used -4 :

1.

6. The method of claim 2, wherein the ionic gel carbon fiber composite material has high toughness. The hollow mold with carbon fiber fabric includes a first glass layer, a second glass layer, a first FEP film layer and a second FEP film layer between the first glass layer and the second glass layer, and a first annular co-rubber layer and a second annular co-rubber layer between the first FEP film layer and the second FEP film layer, and the carbon fiber fabric is arranged between the first annular co-rubber layer and the second annular co-rubber layer, a containing cavity for containing the precursor solution is formed in the inner circumferential surface of the annular rubber layer, and a hole is arranged on the annular rubber layer for injecting the precursor solution into the containing cavity.

7. A high-toughness ionic gel carbon fiber composite material prepared by the method of any one of claims 1-6.

8. Use of the high-toughness ionic gel carbon fiber composite material of claim 7 in the preparation of smart robot ligaments.

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