Epoxy resin composite material and preparation method thereof

Abstract

This application discloses an epoxy resin composite material and its preparation method, relating to the field of polymer materials. The epoxy resin composite material preparation method comprises the following steps: mixing isophorone diisocyanate and oxaloyl dihydrazide to react to obtain a first intermediate; mixing the first intermediate with a polyetheramine to react to obtain an oligomer curing agent having primary amino end groups; and mixing the oligomer curing agent with an epoxy resin matrix and modified basalt fiber, and curing to obtain the epoxy resin composite material; wherein the modified basalt fiber has epoxy groups on its surface. The epoxy resin composite material prepared by this preparation method has high strength and toughness.

Description

Technical Field

[0001] The present application relates to the technical field of polymer materials, and in particular to an epoxy resin composite material and a preparation method thereof. Background Art

[0002] Basalt fiber has mechanical properties superior to glass fiber and is much cheaper than carbon fiber. At the same time, compared with other reinforcing fiber fillers, basalt fiber also has the advantages of extremely low water absorption, excellent acid and alkali corrosion resistance, and high-temperature chemical stability, and has gradually become an ideal material for manufacturing a variety of composite materials.

[0003] Epoxy resins are widely used in aerospace, electronic packaging, and energy equipment due to their excellent mechanical properties, high-temperature stability, and chemical corrosion resistance. However, basalt fiber-reinforced epoxy resins are susceptible to structural defects due to the inherent brittleness of the epoxy matrix and the weak interfacial bonding between the basalt fiber and the epoxy matrix. This significantly reduces the overall mechanical properties and impact resistance of the composite material, severely limiting its wider practical application. Summary of the Invention

[0004] In view of this, the present application provides an epoxy resin composite material and a preparation method thereof, wherein the epoxy resin composite material has high strength and toughness.

[0005] In a first aspect, the present application provides a method for preparing an epoxy resin composite material, comprising the following steps:

[0006] isophorone diisocyanate and oxaloyl dihydrazide are mixed and reacted to obtain a first intermediate;

[0007] mixing the first intermediate with polyetheramine to react to obtain an oligomer curing agent having a primary amino terminal group; and

[0008] An oligomer curing agent is mixed with an epoxy resin matrix and modified basalt fibers, and cured to obtain an epoxy resin composite material; wherein the modified basalt fibers have epoxy groups on their surfaces.

[0009] Optionally, in some embodiments of the present application, the ratio of the amount of isophorone diisocyanate to oxalohydrazide is 2 to 2.1; and / or

[0010] The reaction to obtain the first intermediate is carried out at a temperature of -5 to 5°C; and / or

[0011] The time for the reaction to obtain the first intermediate is 5 to 8 hours; and / or

[0012] The reaction to obtain the first intermediate is carried out under protective gas conditions.

[0013] Optionally, in some embodiments of the present application, isophorone diisocyanate and oxalohydrazide are mixed in a first solvent, and the first solvent is selected from one or more of tetrahydrofuran, N,N-dimethylformamide, acetone, and dimethyl sulfoxide.

[0014] Optionally, in some embodiments of the present application, the ratio of the amount of polyetheramine to the amount of oxalohydrazide is 2 to 2.1; and / or

[0015] The reaction is carried out at 20-30°C to obtain the oligomer curing agent; and / or

[0016] The reaction time to obtain the oligomer curing agent is 2 to 4 hours.

[0017] Alternatively, in some embodiments of the present application, the molecular formula of the polyetheramine is , where m is an integer from 2 to 10.

[0018] Optionally, in some embodiments of the present application, mixing the oligomer curing agent with the epoxy resin matrix and the modified basalt fiber comprises:

[0019] providing an epoxy resin matrix;

[0020] dissolving the epoxy resin matrix in a second solvent to obtain a first dispersion;

[0021] mixing the first dispersion with modified basalt fiber to obtain a second dispersion; and

[0022] The second dispersion is mixed with an oligomer curing agent and cured to obtain an epoxy resin composite material.

[0023] Optionally, in some embodiments of the present application, the mass ratio of epoxy resin matrix to oligomer curing agent is (15-25): (3-5); and / or

[0024] The mass ratio of epoxy resin matrix to modified basalt fiber is 100:5~10.

[0025] Optionally, in some embodiments of the present application, the second solvent is selected from one or more of tetrahydrofuran, N,N-dimethylformamide, acetone, and dimethyl sulfoxide.

[0026] Optionally, in some embodiments of the present application, dissolving the epoxy resin matrix in the second solvent is performed at 60-90° C.; and / or

[0027] The epoxy resin composite material is cured at 60-100°C.

[0028] In a second aspect, the present application further provides an epoxy resin composite material, which is prepared by the above-mentioned preparation method.

[0029] The epoxy resin composite material provided by this application uses basalt fiber with epoxy groups on its surface and synthesizes an oligomer with a diamino terminal group and a six-fold hydrogen bond in the middle chain segment using polyetheramine, diisocyanate, and oxaloyldihydrazide. This oligomer is used as a curing agent to form a covalent network between the epoxy resin and basalt fiber, enhancing their interfacial bonding. At the same time, the physical cross-linking network of multiple hydrogen bonds formed between the curing agent molecules can serve as sacrificial bonds to strengthen and toughen the composite material, resulting in an epoxy resin composite material with both high strength and high toughness. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a flow chart of a method for preparing an epoxy resin composite material provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0033] In this application, unless otherwise indicated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of a device in actual use or operation, specifically in the drawing directions of the accompanying drawings; whereas "inner" and "outer" refer to the outline of the device. Furthermore, in the description of this application, the term "including" means "including but not limited to." Terms such as first, second, and third are used merely as designations and do not impose numerical requirements or establish a sequential order.

[0034] In this application, "and / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0035] In this application, "at least one" means one or more, and "plurality" means two or more. "One or more," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c" or "at least one of a, b and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can each be single or plural.

[0036] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be construed as a hard limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numbers within the range. For example, the description of a range from 1 to 6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which applies regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0037] The structural formulas and molecular weights of some chemical reagents used in this application are described below:

[0038] γ-Glycidyloxypropyltrimethoxysilane (KH560): , molecular weight = 236.34;

[0039] Polyetheramine D-400: , where m is an integer from 2 to 10;

[0040] Isophorone diisocyanate (IPDI): , molecular weight = 222.32;

[0041] Oxaloyldihydrazide: , molecular weight = 118.09.

[0042] The technical solution of this application is as follows:

[0043] In a first aspect, the present application provides a method for preparing an epoxy resin composite material, comprising the following steps:

[0044] S01: mixing isophorone diisocyanate and oxaloyl dihydrazide to react to obtain a first intermediate;

[0045] Specifically, in some embodiments, the ratio of the amount of isophorone diisocyanate to oxalohydrazide can be 2 to 2.1, for example, 2, 2.05, 2.1, or a range between any two of the above values. When the amount of isophorone diisocyanate to oxalohydrazide is within the above range, the reaction can ensure that the first intermediate of the target structure is obtained.

[0046] In some embodiments, the reaction to obtain the first intermediate can be carried out at a temperature of -5 to 5°C, for example, -5°C, -4°C, -3°C, -2°C, -1°C, 0°C, 1°C, 2°C, 3°C, 4°C, 5°C, or any range between any two of the foregoing values. In some embodiments, the reaction to obtain the first intermediate can be carried out for 5 to 8 hours, for example, 5 hours, 6 hours, 7 hours, 8 hours, or any range between any two of the foregoing values. When the reaction temperature and time are within the foregoing ranges, the reaction can be ensured to proceed efficiently and fully.

[0047] In some embodiments, the reaction to obtain the first intermediate can be carried out under protective gas conditions, such as nitrogen, helium, neon, argon, etc. This can reduce side reactions and ensure reaction efficiency.

[0048] In some embodiments, isophorone diisocyanate and oxalohydrazide are mixed in a first solvent, and the first solvent can be selected from one or more of tetrahydrofuran, N,N-dimethylformamide, acetone, and dimethyl sulfoxide.

[0049] In some embodiments, isophorone diisocyanate is mixed with oxalohydrazide to react to obtain a first intermediate according to the following chemical reaction equation:

[0050]

[0051] S02: mixing the first intermediate with polyetheramine to react to obtain an oligomer curing agent having a primary amino terminal group;

[0052] In some embodiments, the molar ratio of polyetheramine to oxalohydrazide may be 2 to 2.1, for example, 2, 2.05, 2.1, or a range between any two of the above values.

[0053] In some embodiments, the reaction to obtain the oligomer curing agent can be carried out at 20-30°C, for example, 20°C, 21°C, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, or any range between any two of the foregoing values. The reaction time to obtain the oligomer curing agent can be 2-4 hours, for example, 2 hours, 3 hours, 4 hours, or any range between any two of the foregoing values. When the reaction temperature and time are within the foregoing ranges, the reaction efficiency can be guaranteed and the reaction can proceed fully.

[0054] In some embodiments, the polyetheramine has the formula , wherein m is an integer from 2 to 10. Further, in some embodiments, the chemical formula of the oligomer curing agent is: , where m is an integer from 2 to 10.

[0055] S03: mixing an oligomer curing agent with an epoxy resin matrix and modified basalt fibers, and curing the mixture to obtain an epoxy resin composite material; wherein the modified basalt fibers have epoxy groups on their surfaces.

[0056] In some embodiments, mixing the oligomer curing agent with the epoxy resin matrix and the modified basalt fiber comprises:

[0057] S031: Providing an epoxy resin matrix;

[0058] S032: dissolving the epoxy resin matrix in a second solvent to obtain a first dispersion;

[0059] S033: mixing the first dispersion with the modified basalt fiber to obtain a second dispersion; and

[0060] S034: Mixing the second dispersion with an oligomer curing agent and curing to obtain an epoxy resin composite material.

[0061] In some embodiments, the mass ratio of the epoxy resin matrix to the oligomer curing agent can be (15-25):(3-5). It should be noted that since the number average molecular weight of commercial polyetheramines generally falls within a range, it is difficult to determine the exact molecular weight of the oligomer curing agent. The inventors of this application have discovered that when the mass ratio of the epoxy resin matrix to the oligomer curing agent is within the aforementioned range, the curing effect is better. Preferably, the mass ratio of the epoxy resin matrix to the oligomer curing agent can be (19-20):(3-5).

[0062] In some embodiments, the mass ratio of the epoxy resin matrix to the modified basalt fiber may be 100:5-10.

[0063] In some embodiments, the second solvent can be selected from one or more of tetrahydrofuran, N,N-dimethylformamide, acetone, and dimethyl sulfoxide.

[0064] In some embodiments, the epoxy resin matrix is ​​dissolved in the second solvent at a temperature of 60-90°C, for example, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, or a range between any two of the above values. Curing to obtain the epoxy resin composite material can be carried out at a temperature of 60-100°C, for example, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, 100°C, or a range between any two of the above values.

[0065] In a second aspect, the present application further provides an epoxy resin composite material, which is prepared by the above-mentioned preparation method.

[0066] The present application will be described in detail below through specific examples. The following examples are only some examples of the present application and are not limitations of the present application.

[0067] Example 1

[0068] This embodiment provides an epoxy resin composite material and a preparation method thereof. The preparation method of the epoxy resin composite material comprises the following steps:

[0069] S01: Weigh 4.5g of isophorone diisocyanate (IPDI, 0.02mol) and 50g of anhydrous THF into a 250ml three-necked flask and stir to mix thoroughly. Purge with nitrogen. Dissolve 1.18g of oxalohydrazide (0.01mol) in 30g of THF and add dropwise to the three-necked flask through a constant pressure funnel under ice bath conditions. Due to the significant difference in activity between the two isocyanate groups of IPDI, react for 6h to obtain an IPDI-terminated oxalohydrazide intermediate.

[0070] S02: In an ice bath, add 8 g of polyetheramine D-400 (0.02 mol) to the solution obtained in step 2, stir and mix evenly, introduce nitrogen protection, and react at room temperature for 3 h. The THF in the reaction is completely removed by rotary evaporation to obtain a light yellow viscous liquid, which is an oligomer curing agent with primary amino terminal groups;

[0071] S03: Take 19.5g of bisphenol A type high molecular weight solid epoxy resin E-03 (Nan Ya NPES-909, epoxy content of 0.0057mol, purchased from Qingyuan Yuhao Trading Co., Ltd.) and 100g of anhydrous DMF and add them to a 250ml beaker. Heat at 80°C and start mechanical stirring until the epoxy resin is completely dissolved. Add 0.5g of modified basalt fiber and continue stirring for half an hour to ensure that the fiber is evenly dispersed. Then add 3.9g of the oligomer curing agent prepared in step S02 at room temperature. After stirring for 10 minutes, pour the resulting slurry into a polytetrafluoroethylene mold and place it in a vacuum oven for curing and molding. Under vacuum conditions, cure at 80°C for 24 hours. Remove the residual DMF to obtain a specimen for subsequent mechanical property testing.

[0072] The preparation method of modified basalt fiber is as follows:

[0073] 100g of chopped basalt fiber (6mm, purchased from Nanyu Mineral Products Processing Plant in Lingshou County) was subjected to DBD atmospheric low-temperature plasma surface modification in batches using a CTP-2000K dielectric barrier discharge experimental apparatus (purchased from Nanjing Suman Plasma Technology Co., Ltd.). Specific process parameters were: power density 60W / cm2, frequency 50kHz, Ar / O2 mixture (volume ratio 1:1), gas flow rate 1L / min, treatment time 180s, and treatment temperature 25°C. A 2wt% silane coupling agent KH-560 / THF solution (100g) was prepared and added to 100g of the plasma-modified basalt fiber. Mechanical stirring was performed to ensure uniform mixing. After reacting at room temperature for 40min, the solid was filtered and dried in a forced air drying oven at 80°C for 3h to remove residual THF, resulting in modified basalt fibers with epoxy groups on the surface.

[0074] Example 2

[0075] This embodiment provides an epoxy resin composite material and a preparation method thereof. The preparation method is basically the same as the preparation method provided in Example 1, except that step S03 is replaced by: 19 g of bisphenol A type high molecular weight solid epoxy resin E-03 (Nan Ya NPES-909, epoxy content of 0.0057 mol, purchased from Qingyuan Yuhao Trading Co., Ltd.) and 100 g of anhydrous DMF are added to a 250 ml beaker, heated at 80 ° C, and mechanical stirring is turned on until the epoxy resin is completely dissolved, 1 g of modified basalt fiber is added, and stirring is continued for half an hour to ensure that the fiber is evenly dispersed, and then 3.9 g of the oligomer curing agent prepared in step S02 is added at room temperature; after stirring for 10 minutes, the resulting slurry is poured into a polytetrafluoroethylene mold and placed in a vacuum oven for curing and molding. Under vacuum conditions, it is cured at 80 ° C for 24 hours, and the residual DMF is removed to obtain a specimen for subsequent mechanical property testing.

[0076] Example 3

[0077] This embodiment provides an epoxy resin composite material and a preparation method thereof. The preparation method is basically the same as the preparation method provided in Example 1, except that step S03 is replaced by: 18.5 g of bisphenol A type high molecular weight solid epoxy resin E-03 (Nan Ya NPES-909, epoxy content of 0.00555 mol, purchased from Qingyuan Yuhao Trading Co., Ltd.) and 100 g of anhydrous DMF are added to a 250 ml beaker, heated at 80 ° C, and mechanical stirring is turned on until the epoxy resin is completely dissolved, 1.5 g of modified basalt fiber is added, and stirring is continued for half an hour to ensure that the fiber is evenly dispersed, and then 3.9 g of the oligomer curing agent prepared in step S02 is added at room temperature; after stirring for 10 minutes, the resulting slurry is poured into a polytetrafluoroethylene mold and placed in a vacuum oven for curing and molding. Under vacuum conditions, it is cured at 80 ° C for 24 hours, and the residual DMF is removed to obtain a specimen for subsequent mechanical property testing.

[0078] Example 4

[0079] This embodiment provides an epoxy resin composite material and a preparation method thereof. The preparation method is basically the same as the preparation method provided in Example 1, except that step S03 is replaced by: 18 g of bisphenol A type high molecular weight solid epoxy resin E-03 (Nan Ya NPES-909, epoxy content of 0.0054 mol, purchased from Qingyuan Yuhao Trading Co., Ltd.) and 100 g of anhydrous DMF are added to a 250 ml beaker, heated at 80°C and mechanically stirred until the epoxy resin is completely dissolved, 2 g of modified basalt fiber (epoxy content of 0.00016 mol) is added, and stirring is continued for half an hour to ensure that the fiber is evenly dispersed, and then 3.8 g of the oligomer curing agent prepared in step S02 is added at room temperature; after stirring for 10 minutes, the resulting slurry is poured into a polytetrafluoroethylene mold and placed in a vacuum oven for curing and molding. Under vacuum conditions, it is cured at 80°C for 24 hours, and the residual DMF is removed to obtain a specimen for subsequent mechanical property testing.

[0080] Comparative Example 1

[0081] This comparative example provides an epoxy resin composite material and a preparation method thereof, the preparation method comprising the following steps:

[0082] 19 g of bisphenol A type high molecular weight solid epoxy resin E-03 (Nan Ya NPES-909, epoxy content of 0.0057 mol, purchased from Qingyuan Yuhao Trading Co., Ltd.) and 100 g of anhydrous DMF were added to a 250 ml beaker and heated at 80 ° C with mechanical stirring until the epoxy resin was completely dissolved. 1 g of untreated basalt fiber was added and stirring was continued for half an hour to ensure that the fiber was evenly dispersed. Then, 1.1 g of polyetheramine D-400 was added at room temperature. After stirring for 10 minutes, the resulting slurry was poured into a polytetrafluoroethylene mold and placed in a vacuum oven for curing and molding. Under vacuum conditions, it was cured at 80 ° C for 24 hours. The residual DMF was removed to obtain a specimen for subsequent mechanical property testing.

[0083] Comparative Example 2

[0084] This comparative example provides an epoxy resin composite material and a preparation method thereof, the preparation method comprising the following steps:

[0085] 18 g of bisphenol A type high molecular weight solid epoxy resin E-03 (Nan Ya NPES-909, epoxy content of 0.0054 mol, purchased from Qingyuan Yuhao Trading Co., Ltd.) and 100 g of anhydrous DMF were added to a 250 ml beaker and heated at 80 ° C with mechanical stirring until the epoxy resin was completely dissolved. 2 g of untreated basalt fiber was added and stirring was continued for half an hour to ensure that the fibers were evenly dispersed. Then, 1.1 g of polyetheramine D-400 was added at room temperature. After stirring for 10 minutes, the resulting slurry was poured into a polytetrafluoroethylene mold and placed in a vacuum oven for curing and molding. Under vacuum conditions, it was cured at 80 ° C for 24 hours. The residual DMF was removed to obtain a specimen for subsequent mechanical property testing.

[0086] Mechanical properties of the epoxy resin composite materials in Examples 1-4 and Comparative Examples 1-2 were tested. The tensile strength test was conducted in accordance with GB / T 2567-2008; the flexural strength test was conducted in accordance with ISO 178:2001; and the Izod notched impact test at 23°C was conducted in accordance with GB / T 1843-2008. The test results are shown in Table 1.

[0087] Table 1

[0088] Example Tensile strength (MPa) Flexural strength (MPa) <![CDATA[Izod impact strength (KJ / m 2 ).]]> Example 1 33.5 51.7 39.3 Example 2 48.4 73.5 35.9 Example 3 64.6 97.2 31.5 Example 4 73.7 116.3 26.4 Comparative Example 1 36.8 58.2 22.1 Comparative Example 2 45.3 84.7 15.6

[0089] As can be seen from the table above, by epoxy-functionalizing the basalt fiber surface and then curing it with diamine, a covalent bond is formed between the epoxy resin matrix and the basalt fiber, resulting in a composite material with superior mechanical properties. For example, comparing the mechanical properties of Example 1 (fiber addition of 2.5 wt%) with Comparative Example 1 (fiber addition of 5 wt%), Example 1 has slightly lower tensile and flexural strengths than Comparative Example 1, but significantly better notched impact strength. Furthermore, the sextuple hydrogen bonds formed between the curing agent molecules act as "sacrificial bonds" to effectively toughen the composite material, resulting in the notched impact strength of the Example being significantly superior to that of the Comparative Example. Therefore, the epoxy resin composite material reported in this invention possesses both high strength and high toughness.

[0090] The above is a detailed introduction to the technical solutions provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for preparing an epoxy resin composite material, characterized in that: The steps include: isophorone diisocyanate and oxaloyl dihydrazide are mixed and reacted to obtain a first intermediate; mixing the first intermediate with polyetheramine to react to obtain an oligomer curing agent having a primary amino terminal group; and The oligomer curing agent is mixed with an epoxy resin matrix and modified basalt fibers, and cured to obtain the epoxy resin composite material; wherein the modified basalt fibers have epoxy groups on their surfaces.

2. The preparation method according to claim 1, characterized in that The molar ratio of the isophorone diisocyanate to the oxaloyl dihydrazide is 2 to 2.1; and / or The reaction to obtain the first intermediate is carried out at a temperature of -5 to 5°C; and / or The time for the reaction to obtain the first intermediate is 5 to 8 hours; and / or The reaction to obtain the first intermediate is carried out under protective gas conditions.

3. The preparation method according to claim 1, characterized in that Isophorone diisocyanate and oxaloyl dihydrazide are mixed in a first solvent, wherein the first solvent is selected from one or more of tetrahydrofuran, N,N-dimethylformamide, acetone, and dimethyl sulfoxide.

4. The preparation method according to claim 1, characterized in that The molar ratio of the polyetheramine to the oxaloylhydrazide is 2 to 2.1; and / or The reaction to obtain the oligomer curing agent is carried out at 20-30°C; and / or The time for the reaction to obtain the oligomer curing agent is 2 to 4 hours.

5. The preparation method according to claim 4, characterized in that The molecular formula of the polyetheramine is , where m is an integer from 2 to 10.

6. The preparation method according to claim 1, characterized in that Mixing the oligomer curing agent with the epoxy resin matrix and the modified basalt fiber comprises: providing an epoxy resin matrix; dissolving the epoxy resin matrix in a second solvent to obtain a first dispersion; mixing the first dispersion with the modified basalt fiber to obtain a second dispersion; and The second dispersion is mixed with the oligomer curing agent and cured to obtain the epoxy resin composite material.

7. The preparation method according to any one of claims 1 to 6, characterized in that The mass ratio of the epoxy resin matrix to the oligomer curing agent is (15-25): (3-5); and / or The mass ratio of the epoxy resin matrix to the modified basalt fiber is 100:0.5-10.

8. The preparation method according to claim 6, characterized in that The second solvent is selected from one or more of tetrahydrofuran, N,N-dimethylformamide, acetone, and dimethyl sulfoxide.

9. The preparation method according to claim 6, characterized in that Dissolving the epoxy resin matrix in a second solvent at 60-90° C.; and / or The epoxy resin composite material is cured at 60-100°C.

10. An epoxy resin composite material, characterized in that: The epoxy resin composite material is prepared by the preparation method according to any one of claims 1 to 9.

Images