Epoxy composite material for full-isothermal compression hydraulic CAES storage tank and preparation method of epoxy composite material

Abstract

The invention belongs to the field of high polymer materials, and particularly relates to an epoxy composite material for a full-isothermal compression hydraulic CAES storage tank and a preparation method of the epoxy composite material. The epoxy composite material for the full isothermal compression hydraulic CAES storage tank provided by the invention is prepared from the following raw materials in parts by mass: 50-100 parts of epoxy resin, 30-35 parts of a curing agent, 5-10 parts of a diluent, 5-20 parts of a flexibilizer and 1-10 parts of an accelerant, can be cured at a relatively low temperature, and has excellent mechanical properties and an excellent actual use effect after being cured.

Description

Technical Field

[0001] The invention belongs to the field of polymer materials, and specifically relates to an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank and a preparation method thereof. Background Art

[0002] The current mainstream energy storage technologies mainly cover three major systems: physical energy storage, chemical energy storage, and electromagnetic energy storage. In the field of large-scale physical energy storage, although pumped storage technology has been commercialized, it has significant geographical dependence and is subject to the limitations of specific hydrogeological conditions. In comparison, CAES (Compressed Air Energy Storage) technology shows a better universal development prospect. The principle of CAES technology is: during the period of low power load, redundant electric energy is converted into compressed air potential energy storage; when there is a power supply gap during peak power consumption, high-pressure air is released to drive the turbine unit to generate electricity, realizing the reverse conversion of potential energy to electric energy. CAES technology can not only effectively regulate the peak and valley loads of the power grid, but also integrate and absorb volatile renewable energy such as photovoltaic and wind power, and promote the optimization and upgrading of the energy structure.

[0003] Early supplementary-fired CAES systems were fossil fuel-dependent. As the air temperature dropped sharply during the energy release process, affecting the turbine efficiency, thermal compensation had to be performed by burning natural gas and other fuels, which not only increased operating costs but also ran counter to low-carbon goals. At present, the research focus has shifted to non-supplementary-fired systems, which replace fossil fuel heating by recovering the heat generated during the compression phase. In fact, the energy storage efficiency of the supplementary-fired power plants that have been built and successfully put into operation is maintained in the range of 44%-53%, while the design efficiency of the projects under construction using advanced insulation technology can reach 70%. At present, the efficiency of fully isothermal compression hydraulic energy storage technology has reached 70-80%, and when it forms a coupled system with a gas turbine, the efficiency can be increased to 80-85%. However, this type of technology poses a dual challenge to storage tank materials, which must simultaneously meet the requirements for ultra-high-pressure gas storage strength and liquid medium corrosion protection.

[0004] Chinese patent application CN118793930A discloses a compressed air energy storage tank based on a combination of basalt fiber and carbon fiber, including a gas storage tank body, an inner lining layer, an outer protective layer, a connection and support system, wherein the outer protective layer is made of wear-resistant and UV-resistant materials - high-density polyethylene or epoxy resin, but the main mechanical strength of the tank comes from basalt fiber and carbon fiber, and the composition of basalt raw materials fluctuates greatly, resulting in large fluctuations in basalt fiber performance and relatively high costs of carbon fiber, making the product difficult to mass produce. Therefore, there is an urgent need for a new material for fully isothermal compression hydraulic CAES tanks that can be cured at room temperature and has excellent mechanical properties and corrosion resistance. Summary of the invention

[0005] In order to solve the above technical problems, the first aspect of the present invention provides an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank, wherein the raw materials for its preparation include, by weight, 50-100 parts of epoxy resin, 30-35 parts of curing agent, 5-10 parts of diluent, 5-20 parts of toughening agent, and 1-10 parts of accelerator.

[0006] As an implementable example, the epoxy resin includes a glycerol ether type epoxy resin.

[0007] Furthermore, the glycerol ether type epoxy resin includes bisphenol A glycidyl ether type epoxy resin or bisphenol F glycidyl ether type epoxy resin, wherein the structural formula of bisphenol A glycidyl ether type epoxy resin is: , where n=0-1, n is the degree of polymerization; The structural formula of bisphenol F glycidyl ether epoxy resin is , Where n=0-1, n is the degree of polymerization.

[0008] As an implementable case, the curing agent includes at least two of polyetheramine, isophorone diamine, R-0133B curing agent, and R3329 curing agent.

[0009] Furthermore, the curing agent at least includes polyetheramine.

[0010] Furthermore, the grades of the polyetheramine include D230, which is from Huntsman Group.

[0011] The present invention selects polyetheramine D230 as the epoxy resin curing agent, mainly to improve the mechanical properties of the epoxy composite material. The product after the polyetheramine D230 is cured has high toughness and toughness, can withstand a large impact load, and the viscosity of the polyetheramine D230 is low, so it is easy to mix evenly with the epoxy resin to form a stable curing system with a long application period. In addition, the polyetheramine D230 can be quickly cured at a relatively low temperature, and the epoxy composite material is particularly suitable for use in a fully isothermal compression hydraulic CAES storage tank.

[0012] At the same time, polyetheramine D230 enhances the crosslinking density of the epoxy resin system, improves weather resistance and heat resistance, and enables the cured product to maintain stable performance in harsh environments such as high temperature, humidity and ultraviolet rays; in order to further improve the mechanical properties and heat resistance of the product, the inventors found that when at least two curing agents selected from isophorone diamine, R-0133B curing agent, and R3329 curing agent are compounded with polyetheramine D230, the polymerization rate of the epoxy resin can be further increased, the combined material is cured at room temperature, and has more excellent mechanical properties.

[0013] As an implementable case, the diluent includes one or more of ethylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, and neopentyl glycol diglycidyl ether.

[0014] Furthermore, the diluent is 1,4-butanediol diglycidyl ether.

[0015] As an implementable case, the accelerator is a tertiary amine accelerator.

[0016] Furthermore, the tertiary amine accelerator includes DMP-30 (2,4,6-tris(dimethylaminomethyl)phenol).

[0017] As an implementable case, the toughening agent includes one of QS-BE toughening agent, HYPRO ETBN toughening agent, and S-2030 toughening agent.

[0018] In the present invention, DMP-30 is selected as an accelerator and is combined with an appropriate toughening agent to be compounded into the epoxy resin system, which can effectively improve the mechanical properties and corrosion resistance of the epoxy composite material and achieve the technical effect of low-temperature curing. This is mainly because DMP-30, as a tertiary amine curing accelerator, can not only significantly improve the curing efficiency of the epoxy resin and shorten the curing time, but also effectively reduce the curing temperature, so that the system can complete the curing process under milder conditions.

[0019] At the same time, the addition of DMP-30 also helps to improve the mechanical properties of epoxy resin, such as hardness, strength and toughness, and ensures the overall mechanical properties of the product. In order to further enhance the toughness of epoxy resin and meet the high requirements of the full isothermal compression hydraulic CAES storage tank for impact resistance and crack resistance, it is particularly important to select a suitable toughening agent for compounding. In the present invention, a specific toughening agent is selected, which can significantly improve the toughness of the combined material system by physical blending or chemical modification with the epoxy resin, and further improve other mechanical properties. Importantly, the addition of a toughening agent usually does not have a negative impact on the curing promotion effect of DMP-30, and the two can work synergistically to jointly improve the comprehensive performance of the epoxy combined material system.

[0020] The second aspect of the present invention provides a method for preparing an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank, comprising: S1. Heat the epoxy resin in a 60°C oven for 1 hour, then add a diluent and a toughening agent to the heated epoxy resin according to the mass fraction, and stir with a stirrer at a speed of 800 r / min for 20 minutes to obtain epoxy composite material A for full isothermal compression hydraulic CAES storage tank; S2. Prepare and mix the curing agent according to the mass fraction, add the accelerator to the curing agent according to the mass fraction, and stir with a stirrer at a speed of 600 r / min for 10 min to obtain the epoxy composite material B for the fully isothermal compression hydraulic CAES storage tank; S3. Mix the prepared epoxy composite material A for full isothermal compression hydraulic CAES storage tank and the epoxy composite material B for full isothermal compression hydraulic CAES storage tank, and stir them with a mixer at a speed of 1000r / min for 2 to 3min to obtain the epoxy composite material for full isothermal compression hydraulic CAES storage tank.

[0021] Beneficial Effects (i) The epoxy composite material provided by the present invention does not require heating equipment and can be quickly cured at room temperature, reaching a Shore D hardness of more than 60 within 24 hours, greatly shortening the production cycle and being suitable for on-site winding construction.

[0022] (ii) In the present invention, after compounding at least two curing agents selected from isophorone diamine, R-0133B curing agent, and R3329 curing agent and polyetheramine D230, the polymerization rate of the epoxy composite material can be further improved, and the product can be cured at room temperature and has more excellent mechanical properties.

[0023] (III) After being immersed in 100% pure gasoline or ethanol-gasoline mixed medium for 120 days, the bending strength retention rate of the epoxy composite material provided by the present invention is still not less than 80%. At the same time, it has outstanding resistance to solvent and acid, alkali and salt corrosion, and is suitable for the field of full isothermal compression hydraulic energy storage technology.

[0024] (IV) The epoxy composite material provided by the present invention can still be normally wound and cured under high humidity conditions, which solves the problem that the curing quality of traditional epoxy resins is affected by humidity and expands the application scenarios.

[0025] (V) The present invention mainly improves the toughness, compressive strength and fatigue resistance of epoxy composite materials through the compound design of epoxy resin, toughening agent and accelerator, so as to meet the dual requirements of compressed air energy storage tanks for high pressure and corrosion resistance of gas / liquid coexistence. DETAILED DESCRIPTION

[0026] Example 1 The first aspect of the present embodiment provides an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank, wherein the raw materials for its preparation are, in parts by mass, specifically: 100 parts of epoxy resin, 5 parts of diluent, 5 parts of toughening agent, 32 parts of curing agent, and 4 parts of accelerator.

[0027] The epoxy resin is bisphenol A diglycidyl ether epoxy resin, purchased from Nanya Electronic Materials Co., Ltd., model 128, and the chemical structural formula is: , where n=0-1, n is the degree of polymerization.

[0028] The curing agent is specifically composed of 80 parts of polyetheramine D230, 12 parts of R-0133B curing agent and 8 parts of isophorone diamine in terms of mass parts; wherein the polyetheramine D230 is sourced from Huntsman Group, and the R-0133B curing agent is purchased from Guangdong Rich Technology Co., Ltd.; that is, 32 parts of the curing agent include polyetheramine D230, R-0133B curing agent and isophorone diamine; the mass ratio of the three components of polyetheramine D230, R-0133B curing agent and isophorone diamine is 80:12:8.

[0029] The diluent is 1,4-butanediol diglycidyl ether.

[0030] The toughening agent is QS-BE toughening agent purchased from Beijing Jindao Qishi Material Technology Co., Ltd.

[0031] The accelerator is DMP-30.

[0032] The second aspect of this embodiment provides a method for preparing an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank, specifically: S1. Heat the epoxy resin in a 60°C oven for 1 hour, then add a diluent and a toughening agent to the heated epoxy resin according to the mass fraction, and stir with a stirrer at a speed of 800 r / min for 20 minutes to obtain epoxy composite material A for full isothermal compression hydraulic CAES storage tank; S2. Prepare and mix the curing agent according to the mass fraction, add the accelerator to the curing agent according to the mass fraction, and stir with a stirrer at a speed of 600 r / min for 10 min to obtain the epoxy composite material B for the fully isothermal compression hydraulic CAES storage tank; S3. Mix the prepared epoxy composite material A for full isothermal compression hydraulic CAES storage tank and the epoxy composite material B for full isothermal compression hydraulic CAES storage tank, and stir them with a mixer at a speed of 1000r / min for 3min to obtain the epoxy composite material for full isothermal compression hydraulic CAES storage tank.

[0033] Example 2 The first aspect of the present embodiment provides an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank, wherein the raw materials for its preparation are, in parts by mass, specifically: 100 parts of epoxy resin, 5 parts of diluent, 5 parts of toughening agent, 30 parts of curing agent, and 4 parts of accelerator.

[0034] The epoxy resin is bisphenol A diglycidyl ether epoxy resin, purchased from Nanya Electronic Materials Co., Ltd., model 128, and the chemical structural formula is: , where n=0-1, n is the degree of polymerization.

[0035] The curing agent is specifically composed of 35 parts of polyetheramine D230, 20 parts of R3329 curing agent and 45 parts of isophorone diamine in terms of mass parts; wherein the polyetheramine D230 is sourced from Huntsman Group, and the R3329 curing agent is purchased from Guangdong Rich Technology Co., Ltd.; that is, 30 parts of the curing agent include polyetheramine D230, R3329 curing agent and isophorone diamine; the mass ratio of the three components of polyetheramine D230, R3329 curing agent and isophorone diamine is 35:20:45.

[0036] The diluent is 1,4-butanediol diglycidyl ether.

[0037] The toughening agent is HYPRO ETBN toughening agent, purchased from Huntsman Polyurethane (China) Co., Ltd.

[0038] The accelerator is DMP-30.

[0039] The second aspect of this embodiment provides a method for preparing an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank, specifically: S1. Heat the epoxy resin in a 60°C oven for 1 hour, then add a diluent and a toughening agent to the heated epoxy resin according to the mass fraction, and stir with a stirrer at a speed of 800 r / min for 20 minutes to obtain epoxy composite material A for full isothermal compression hydraulic CAES storage tank; S2. Prepare and mix the curing agent according to the mass fraction, add the accelerator to the curing agent according to the mass fraction, and stir with a stirrer at a speed of 600 r / min for 10 min to obtain the epoxy composite material B for the fully isothermal compression hydraulic CAES storage tank; S3. Mix the prepared epoxy composite material A for full isothermal compression hydraulic CAES storage tank and the epoxy composite material B for full isothermal compression hydraulic CAES storage tank, and stir them with a mixer at a speed of 1000r / min for 3min to obtain the epoxy composite material for full isothermal compression hydraulic CAES storage tank.

[0040] Example 3 The first aspect of the present embodiment provides an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank, wherein the raw materials for its preparation are calculated by weight as follows: 100 parts of epoxy resin, 5 parts of diluent, 5 parts of toughening agent, 35 parts of curing agent, and 4 parts of accelerator.

[0041] The epoxy resin is bisphenol A diglycidyl ether epoxy resin, purchased from Nanya Electronic Materials Co., Ltd., model 128, and the chemical structural formula is: ; Where n=0-1, n is the degree of polymerization.

[0042] The curing agent is specifically calculated by weight: 70 parts of polyetheramine D230, 20 parts of R-0133B curing agent and 10 parts of R3329 curing agent; wherein the polyetheramine D230 is from Huntsman Group, the R-0133B curing agent is purchased from Guangdong Rich Technology Co., Ltd., and the R3329 curing agent is purchased from Guangdong Rich Technology Co., Ltd.; that is, 35 parts of curing agent include polyetheramine D230, R-0133B curing agent and R3329 curing agent; the mass ratio of the three components of polyetheramine D230, R-0133B curing agent and R3329 curing agent is 70:20:10.

[0043] The diluent is 1,4-butanediol diglycidyl ether.

[0044] The toughening agent is S-2030 toughening agent purchased from Mitsubishi Corporation.

[0045] The accelerator is DMP-30.

[0046] The second aspect of this embodiment provides a method for preparing an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank, specifically: S1. Heat the epoxy resin in a 60°C oven for 1 hour, then add a diluent and a toughening agent to the heated epoxy resin according to the mass fraction, and stir with a stirrer at a speed of 800 r / min for 20 minutes to obtain epoxy composite material A for full isothermal compression hydraulic CAES storage tank; S2. Prepare and mix the curing agent according to the mass fraction, add the accelerator to the curing agent according to the mass fraction, and stir with a stirrer at a speed of 600 r / min for 10 min to obtain the epoxy composite material B for the fully isothermal compression hydraulic CAES storage tank; S3. Mix the prepared epoxy composite material A for full isothermal compression hydraulic CAES storage tank and the epoxy composite material B for full isothermal compression hydraulic CAES storage tank, and stir them with a mixer at a speed of 1000r / min for 3min to obtain the epoxy composite material for full isothermal compression hydraulic CAES storage tank.

[0047] Comparative Example 1 The first aspect of this example provides an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank, wherein the raw materials for its preparation are calculated by weight as follows: 100 parts of epoxy resin, 30 parts of curing agent, and 5 parts of diluent.

[0048] The epoxy resin is bisphenol A diglycidyl ether epoxy resin, purchased from Nanya Electronic Materials Co., Ltd., model 128, and the chemical structural formula is: ; Where n=0-1, n is the degree of polymerization.

[0049] The curing agent is specifically calculated by weight: 40 parts of polyetheramine D230, 15 parts of R3329 curing agent and 45 parts of isophorone diamine; wherein the polyetheramine D230 is from Huntsman Group, and the R3329 curing agent is purchased from Guangdong Rich Technology Co., Ltd.; that is, 30 parts of the curing agent include polyetheramine D230, R3329 curing agent and isophorone diamine; the mass ratio of the three components of polyetheramine D230, R3329 curing agent and isophorone diamine is 40:15:45.

[0050] The diluent is 1,4-butanediol diglycidyl ether.

[0051] The second aspect of this example provides a method for preparing an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank, specifically: S1. Heat the epoxy resin in a 60°C oven for 1 hour, then add a diluent to the heated epoxy resin according to the mass fraction, and stir with a stirrer at a speed of 800 r / min for 20 minutes to obtain epoxy composite material A for full isothermal compression hydraulic CAES storage tank; S2. Prepare and mix the curing agent according to the mass fraction, and stir it with a stirrer at a speed of 600 r / min for 10 min to obtain epoxy composite material B for full isothermal compression hydraulic CAES storage tank; S3. Mix the prepared epoxy composite material A for full isothermal compression hydraulic CAES storage tank and the epoxy composite material B for full isothermal compression hydraulic CAES storage tank, and stir them with a mixer at a speed of 1000r / min for 3min to obtain the epoxy composite material for full isothermal compression hydraulic CAES storage tank.

[0052] Performance Testing 1. Performance test of glass fiber composite materials For Example 1, 38 parts of the epoxy composition were evenly coated on 62 parts of 1250 g / m 2 The uniaxial glass fiber cloth, the model of which is E8-UD1250-390, is cured at room temperature of 25°C for 4 hours to obtain a glass fiber composite material.

[0053] For Example 2, 38 parts of the epoxy composition were evenly coated on 62 parts of 1250 g / m 2 The uniaxial glass fiber cloth, the model of which is E8-UD1250-390, is cured at 50°C for 5h to obtain a glass fiber composite material.

[0054] For Example 3, 40 parts of the epoxy composition were evenly coated on 60 parts of 1250 g / m 2The uniaxial glass fiber cloth, the model of which is E8-UD1250-390, is first cured at 60°C for 1h and then cured at 80°C for 2h to obtain a glass fiber composite material.

[0055] For Comparative Example 1, 40 parts of the epoxy composition were evenly coated on 60 parts of 1250 g / m 2 The uniaxial glass fiber cloth, the model of which is E8-UD1250-390, is first cured at 70°C for 1h and then cured at 100°C for 2h to obtain a glass fiber composite material.

[0056] The glass fiber composite materials obtained by the corresponding processing of Examples 1-2 and Comparative Example 1 were immersed in pure gasoline, and the mass change rate, Shore D hardness, flexural strength retention rate and flexural modulus retention rate of the products at different periods were tested. The experimental results are detailed in Tables 1-3; wherein “—” represents data not tested.

[0057] Table 1

[0058] Table 2

[0059] Table 3

[0060] The glass fiber composite materials obtained by the corresponding processing of Examples 1-2 and Comparative Example 1 were immersed in a mixed solvent of gasoline and ethanol, wherein the volume ratio of gasoline to ethanol was 9:1, and then the mass change rate, Shore D hardness, flexural strength retention rate and flexural modulus retention rate of the products at different periods were tested. The experimental results are detailed in Tables 4-6; wherein “—” represents data not tested.

[0061] Table 4

[0062] Table 5

[0063] Table 6

[0064] It can be seen from the experimental results in Tables 1-6 that the epoxy composite material provided by Examples 1-2 of the present invention can be cured at a relatively low temperature and has excellent corrosion resistance. It can maintain a relatively high Shore D hardness, flexural strength retention rate, and flexural modulus retention rate in an organic solvent for a long time, and the mass change rate is low; while the long-term Shore D hardness, flexural strength retention rate, and flexural modulus retention rate of Comparative Example 1 without adding a toughening agent and an accelerator are relatively low, and the mass change rate is relatively high, and the stability of the product is significantly lower than that of Examples 1-2.

[0065] Regarding the reason why the flexural strength retention rate and flexural modulus retention of the epoxy composite material prepared in Example 1-2 first increase and then decrease in the immersion test: the epoxy composite material usually has a small upward trend in the immersion medium, followed by a downward trend. This is because a small amount of small molecule solvent first penetrates into the rigid epoxy composite material to play a toughening role, so the strength of the resin will increase slightly. However, as the amount of solvent penetration increases, the van der Waals force between the material molecules is destroyed, causing the material strength to begin to decrease.

[0066] The mechanical properties of the glass fiber composite materials obtained in Test Examples 1-3 and Comparative Example 1 are shown in Table 7 for specific test items and experimental results.

[0067] Table 7

[0068] It can be seen from the experimental results in Table 7 that the mechanical properties of the epoxy composite materials provided in Examples 1-3 of the present invention are improved to a certain extent compared with those in Comparative Example 1. Therefore, the epoxy composite materials prepared in Examples 1-3 are more suitable for full isothermal compression hydraulic CAES storage tanks.

[0069] 2. Casting performance test Test objects: Epoxy system materials prepared in Examples 1-3 and Comparative Example 1.

[0070] Experimental steps: Step 1: Make four casting plates, take two smooth and flat glass and clean the surface, apply the release agent on the surface, let it stand for 5 minutes, use the thickness tape, black glue and raw tape to make a leak-proof tape around the edge of the glass, leaving one end as the casting port, fit the other piece of glass to it and fix it with a clamp.

[0071] Step 2: For Example 1, epoxy composite material A / B is mixed and prepared according to parts by mass and stirred evenly, and then vacuum degassing treatment is performed first. After the bubbles are completely removed, the mixture is cast into the prepared casting plate. The epoxy composite material sample can be obtained by curing the resin at room temperature of 25°C for 24 hours.

[0072] For Example 2, epoxy composite material A / B is mixed and prepared according to parts by mass and stirred evenly, and then vacuum degassing treatment is first performed. After the bubbles are completely removed, the mixture is poured into the prepared casting plate, and the epoxy composite material sample is obtained after the resin is cured under the curing conditions of 50°C / 5h.

[0073] For Example 3, epoxy composite material A / B are mixed and prepared according to parts by mass and stirred evenly, and then vacuum degassing treatment is first performed. After the bubbles are completely removed, the mixture is cast into the prepared casting body plate. The epoxy composite material sample is obtained by curing the resin at 60°C for 1 hour and then at 80°C for 2 hours.

[0074] For Comparative Example 1, epoxy composite material A / B are mixed and prepared according to parts by mass and stirred evenly, and then vacuum degassing treatment is first performed. After the bubbles are completely removed, the mixture is cast into the prepared casting body plate. The resin is cured at 70°C for 1 hour and then at 100°C for 2 hours to obtain the epoxy composite material sample.

[0075] Step 3: Cut the sample according to the size of the test specimen to obtain the tensile and bending test specimens.

[0076] Step 4: Send the prepared specimens to the test room for constant temperature, and perform tensile and bending tests after the temperature is constant.

[0077] Test method: tensile test and bending test, and the experimental results are recorded in Table 8.

[0078] Parameters involved in the test: 1. Sample size: 100mm (length) × 80mm (width) × 4mm (thickness); 2. Test span: 64mm; 3. Test speed: 2.0mm / min (arbitration speed); 4. Instrument model: Instron3382; 5. Test standard: GB / T 2567-2021; 6. Indenter diameter: 10mm.

[0079] Table 8

[0080] It can be seen from the experimental results in Table 8 that the epoxy composite materials provided in Examples 1-3 of the present invention are actually used in castings, and the mechanical properties are improved to a certain extent compared with those of Comparative Example 1. Therefore, the epoxy composite materials prepared in Examples 1-3 have excellent practical use effects when used in full isothermal compression hydraulic CAES storage tanks.

Claims

1. An epoxy composite material for a fully isothermal compression hydraulic CAES storage tank, characterized in that: The raw materials for preparation include 50-100 parts of epoxy resin, 30-35 parts of curing agent, 5-10 parts of diluent, 5-20 parts of toughening agent, and 1-10 parts of accelerator according to the weight ratio; The epoxy resin includes glycerol ether type epoxy resin; The glycerol ether type epoxy resin includes bisphenol A glycidyl ether type epoxy resin or bisphenol F glycidyl ether type epoxy resin, wherein the structural formula of bisphenol A glycidyl ether type epoxy resin is: , where n=0-1; The structural formula of bisphenol F glycidyl ether epoxy resin is: ， Where n=0-1; The curing agent at least includes polyetheramine; The curing agent further comprises at least two of isophorone diamine, R-0133B curing agent and R3329 curing agent.

2. The epoxy composite material for the fully isothermal compression hydraulic CAES storage tank according to claim 1, characterized in that: The diluent includes one or more of ethylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, and neopentyl glycol diglycidyl ether.

3. The epoxy composite material for the fully isothermal compression hydraulic CAES storage tank according to claim 1, characterized in that: The accelerator is a tertiary amine accelerator.

4. The epoxy composite material for the fully isothermal compression hydraulic CAES storage tank according to claim 1, characterized in that: The toughening agent includes one of QS-BE toughening agent, HYPRO ETBN toughening agent and S-2030 toughening agent.

5. A method for preparing an epoxy composite material for a fully isothermal compression hydraulic CAES storage tank according to any one of claims 1 to 4, characterized in that: include: S1. Heat the epoxy resin in a 60°C oven for 1 hour, then add a diluent and a toughening agent to the heated epoxy resin according to the mass fraction, and stir with a stirrer at a speed of 800 r / min for 20 minutes to obtain epoxy composite material A for full isothermal compression hydraulic CAES storage tank; S2. Prepare and mix the curing agent according to the mass fraction, add the accelerator to the curing agent according to the mass fraction, and stir with a stirrer at a speed of 600 r / min for 10 min to obtain the epoxy composite material B for the fully isothermal compression hydraulic CAES storage tank; S3. Mix the prepared epoxy composite material A for full isothermal compression hydraulic CAES storage tank and the epoxy composite material B for full isothermal compression hydraulic CAES storage tank, and stir them with a mixer at a speed of 1000r / min for 3min to obtain the epoxy composite material for full isothermal compression hydraulic CAES storage tank.

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