Compositions, composite epoxy resins and applications and flywheels

Abstract

The present application relates to the technical field of resin, in particular to a composition, a composite epoxy resin, applications and a flywheel.The composition comprises component A and component B, the weight ratio of component A to component B is 100:(15-40); wherein, the component A comprises 50-85 parts by weight of a base epoxy resin, 0-30 parts by weight of a polyether modified epoxy resin, 5-20 parts by weight of a 3-4 functional group epoxy diluent and 0.3-1.5 parts by weight of a fiber infiltration aid; the component B comprises 15-40 parts by weight of an amine curing agent, 0-3 parts by weight of an epoxy curing accelerator.The composition can be cured below 90 DEG C, the required curing temperature is low, the composite epoxy resin formed by curing has good fiber wettability, and has excellent impact resistance and good toughness.

Description

Technical Field

[0001] This invention relates to the field of resin technology, specifically to a composition, a composite epoxy resin and its applications, and a flywheel. Background Technology

[0002] Flywheel energy storage technology has been applied in various fields such as power peak shaving, uninterrupted power supply, power grid transmission, electric vehicles, and satellite power supply due to its advantages such as high energy density, high power density, compatibility with traditional generator sets, low susceptibility to ambient temperature, long service life, and environmental friendliness. A flywheel energy storage system is a device that uses the acceleration and deceleration of a flywheel to convert electrical energy into mechanical energy. It mainly consists of a flywheel rotor, a generator / motor and controller, magnetic bearings, and a vacuum container. The flywheel rotor is the most crucial energy storage component in the flywheel energy storage system.

[0003] Energy storage density is a crucial indicator of flywheel rotor performance. Since the rotor's energy storage density is directly proportional to the material's specific strength, high-specific-strength materials are essential to achieve high energy storage capacity and density. Currently, internationally mature products are based on metal materials such as aluminum and high-strength steel. Compared to metal materials, carbon fiber composites, with their superior properties of high specific strength, good rigidity, and low specific gravity, are the preferred material for high-speed energy storage flywheels. Epoxy resin, in addition to its good mechanical properties and high-temperature resistance, also exhibits excellent adhesion to carbon fiber surfaces, preventing issues like weak bonding, delamination, and cracking in carbon fiber / resin composites. Therefore, epoxy resin is frequently used as the matrix in the production of carbon fiber composites. However, current flywheel manufacturing processes suffer from drawbacks such as insufficient impact resistance, high brittleness, and high curing temperatures. This results in flywheels with unsatisfactory impact resistance. Furthermore, the high curing temperature of epoxy resin introduces a risk of cracking during flywheel fabrication. Additionally, the insufficient impregnation time of epoxy resin into the fibers limits the flywheel's size.

[0004] There is an urgent need to develop an epoxy resin with strong impact resistance, low curing temperature, and good toughness, which is of great significance for improving the fatigue resistance and limiting speed of flywheels. Summary of the Invention

[0005] This invention addresses the problems of insufficient impact resistance and high curing temperature of existing epoxy resin materials by providing a composition, a composite epoxy resin, its application, and a flywheel.

[0006] To achieve the above objectives, a first aspect of the present invention provides a composition comprising: component A and component B, wherein the weight ratio of component A to component B is 100:(15-40); wherein,

[0007] Component A comprises 50-85 parts by weight of matrix epoxy resin, 0-30 parts by weight of polyether modified epoxy resin, 5-20 parts by weight of 3-4 functional group epoxy diluent and 0.3-1.5 parts by weight of fiber impregnation aid.

[0008] Component B includes 15-40 parts by weight of an amine curing agent and 0-3 parts by weight of an epoxy curing accelerator.

[0009] A second aspect of the present invention provides a composite epoxy resin, which is obtained by curing a raw material containing the composition described in the first aspect above.

[0010] The curing reaction conditions include: a reaction temperature of 70-90℃ and a reaction time of 2-4 hours.

[0011] A third aspect of the present invention provides the use of the composition described in the first aspect in impregnating fibers, wherein the fibers are fibers for winding flywheels.

[0012] A fourth aspect of the present invention provides a flywheel, characterized in that the flywheel includes a magnetic bearing and a winding layer; wherein the winding layer contains fibers and the composite epoxy resin described in the second aspect above.

[0013] The composition provided by the present invention includes a resin component with a specific composition, a diluent and a curing agent. The composition can be cured at a temperature below 90°C. The curing temperature is low and the time is short. The composite epoxy resin formed by the curing reaction has good wettability with fibers and has excellent impact resistance and good toughness. Detailed Implementation

[0014] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0015] A first aspect of the present invention provides a composition comprising: component A and component B, wherein the weight ratio of component A to component B is 100:(15-40); wherein,

[0016] Component A comprises 50-85 parts by weight of matrix epoxy resin, 0-30 parts by weight of polyether modified epoxy resin, 5-20 parts by weight of 3-4 functional group epoxy diluent and 0.3-1.5 parts by weight of fiber impregnation aid.

[0017] Component B includes 15-40 parts by weight of an amine curing agent and 0-3 parts by weight of an epoxy curing accelerator.

[0018] The curing temperature of existing epoxy resin compositions is typically above 120°C, resulting in composite epoxy resins with unsatisfactory impact resistance. The inventors of this invention have discovered that by using a composition comprising specific resin components, a diluent, and a curing agent, a composite epoxy resin with excellent impact resistance can be formed after curing at below 90°C for 2-4 hours, achieving an impact strength ≥60 KJ / m². 2 It also has good toughness, with a flexural strength ≥110MPa and a flexural modulus ≥2700MPa. It has good fiber wettability and can be used as an epoxy resin matrix for fiber composite materials to improve the impact resistance of the material. The composite material has excellent interlaminar shear properties, which can well meet the performance requirements of the flywheel for the epoxy resin material in the winding layer in flywheel energy storage technology.

[0019] According to the present invention, in addition to satisfying the above-mentioned quantitative relationship, the weight ratio of component A to component B in the composition is preferably 100:(25-38), which can better balance the low curing temperature of the composition and the high impact resistance of the cured product.

[0020] According to the present invention, preferably, component A in the composition comprises 60-82 parts by weight of a matrix epoxy resin, 6-28 parts by weight of a polyether-modified epoxy resin, 6-18 parts by weight of a 3-4 functional group epoxy diluent and 0.5-1.2 parts by weight of a fiber impregnation aid, which can improve the toughness of the cured product of the composition and facilitate the impregnation of the composition with fibers.

[0021] According to the present invention, in the composition, preferably, component B includes 25-38 parts by weight of an amine curing agent and 1-2.5 parts by weight of an epoxy curing accelerator, which is more conducive to the curing of the composition at a lower temperature.

[0022] According to the present invention, in component A of the composition, the matrix epoxy resin provides the cured product with suitable viscosity and excellent mechanical properties. Preferably, the epoxy value of the matrix epoxy resin is 0.4-0.65. Preferably, the viscosity of the matrix epoxy resin at 25°C is 1200-20000 cps. Using a matrix epoxy resin that meets the above performance indicators facilitates the formation of suitable viscosity among the components in the composition after mixing, reduces the generation of air bubbles during mixing, and improves the wettability of the composition to fibers.

[0023] In this invention, the epoxy value of the epoxy resin is determined by the method specified in GB / T 4612-2008.

[0024] In this invention, the viscosity of the epoxy resin at 25°C is determined by the method specified in ASTM D-2983-23.

[0025] According to the present invention, more preferably, the matrix epoxy resin can be at least one of bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin, bisphenol F type epoxy resin, and phenolic epoxy resin that meets the above-mentioned requirements. The source of the matrix epoxy resin is not particularly limited in the present invention; it can be prepared by known methods or a commercially available product. For example, the bisphenol A type epoxy resin can be CYD-127 epoxy resin or CYD-128 epoxy resin from Sinopec Hunan Petrochemical Co., Ltd.; the hydrogenated bisphenol A type epoxy resin can be CYDH-300 epoxy resin from Sinopec Hunan Petrochemical Co., Ltd. or XY-518 epoxy resin from Complex High-Tech Materials (Shanghai) Co., Ltd.; the bisphenol F type epoxy resin can be NPEF-175 epoxy resin, NPEF-180 epoxy resin, or NPEF-185 epoxy resin from Nan Ya Plastics Industry Co., Ltd.; and the phenolic epoxy resin can be NPPN-631 epoxy resin or NPPN-638 epoxy resin from Nan Ya Plastics Industry Co., Ltd.

[0026] According to a preferred embodiment of the present invention, the matrix epoxy resin is a bisphenol F type epoxy resin.

[0027] According to the present invention, when component A of the composition contains the polyether-modified epoxy resin, it is advantageous to improve the toughness of the product obtained after curing the composition. Preferably, the epoxy value of the polyether-modified epoxy resin is 0.15-0.35. Preferably, the viscosity of the polyether-modified epoxy resin at 25°C is 3000-30000 cps. Using a polyether-modified epoxy resin that meets the above performance indicators is advantageous to improve the toughness of the cured product of the composition and can reduce the initial viscosity of the product obtained after curing.

[0028] According to the present invention, more preferably, the polyether-modified epoxy resin can be at least one of polyether-modified bisphenol A type epoxy resin, polyether-modified bisphenol F type epoxy resin, and polyether-modified silicone epoxy resin that meets the above-mentioned index requirements. The source of the above-mentioned polyether-modified epoxy resin is not particularly limited in the present invention; it can be obtained by self-production using known methods or by commercially available brand products. For example, the polyether-modified epoxy resin can be EP-4000 epoxy resin, EP-1307 epoxy resin, etc., manufactured by Complex High-Tech Materials (Shanghai) Co., Ltd.

[0029] According to a preferred embodiment of the present invention, the polyether-modified epoxy resin is EP-4000 epoxy resin.

[0030] According to the present invention, in component A of the composition, the 3-4 functional group epoxy diluent is a reactive diluent, which can reduce the viscosity of each component in the composition after mixing and make the cured product of the composition have high impact strength.

[0031] In this invention, the 3-4 functional group epoxy diluent refers to an epoxy diluent containing 3 or 4 epoxy groups in its molecular chain. Preferably, the 3-4 functional group epoxy diluent is a glycidyl ether diluent. More preferably, the 3-4 functional group epoxy diluent may be selected from at least one of trimethylolpropane triglycidyl ether, propoxyglycerol triglycidyl ether, glycerol triglycidyl ether, pentaerythritol tetraglycidyl ether, and sorbitol glycidyl ether.

[0032] According to a preferred embodiment of the present invention, the 3-4 functional group epoxy diluent is selected from propoxyglycerol triglycidyl ether and / or glycerol triglycidyl ether.

[0033] According to the present invention, in component A of the composition, the fiber wetting agent can improve the adhesion between the composition and the fiber. Preferably, the fiber wetting agent can be selected from at least one of polysiloxane coupling agents, titanate coupling agents, and aluminate coupling agents. For example, KH-560 (γ-glycidyl etheroxypropyltrimethoxysilane), BYK-C 8001, BYK-P 9912, and BYK-P 9920 from Hong Kong Haiyi Enterprise Development Co., Ltd.

[0034] According to a preferred embodiment of the present invention, the fiber impregnation agent is KH-560.

[0035] According to the present invention, in component B of the composition, the amine curing agent enables the composition to cure at a lower temperature and improves the impact resistance of the cured product. Preferably, the amine curing agent may be selected from at least one of aliphatic amines, polyamides, cycloaliphatic amines, and aromatic amines, and more preferably cycloaliphatic amines.

[0036] According to the present invention, the fatty amine curing agent may be at least one of the following: diethylenetriamine, triethylenetetramine, triethylenetetramine, tetraethylenepentamine, triethylamine, and EC280 from Shenzhen Jiadida New Material Technology Co., Ltd.

[0037] According to the present invention, the polyamide curing agent may be at least one selected from, but not limited to, dimer fatty acid polyamides, cashew nut shell oil-modified polyamides, and glycidyl methacrylate polyamides. For example, JH-5150 and JH-5160 from Shenzhen Jiadida New Material Technology Co., Ltd.

[0038] According to the present invention, the alicyclic amine curing agent may be at least one of monocyclic alicyclic amines, polycyclic alicyclic amines, and modified alicyclic amines. For example, 1,3-cyclohexanedimethylamine, aminoethylpiperazine, EC201, EC331, and H-100S from Shenzhen Jiadida New Material Technology Co., Ltd.

[0039] According to the present invention, the aromatic amine curing agent may be at least one of monofunctional aromatic amines, polyfunctional aromatic amines, and modified aromatic amines. For example, m-phenylenediamine, 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane, Ethacure200 and Ethacure 300 from Shenzhen Jiadida New Material Technology Co., Ltd.

[0040] According to a preferred embodiment of the present invention, the amine curing agent is EC331.

[0041] According to the present invention, when component B of the composition contains the epoxy curing accelerator, the curing temperature of the composition can be further reduced. Preferably, the epoxy curing accelerator can be selected from at least one of tertiary amines and their salts, imidazoles and their salts, triphenylphosphine, and quaternary ammonium salts. For example, the epoxy curing accelerator can be at least one of DBU (1,8-diazabicyclo[5.4.0]undec-7-ene), DMP-20 (bis[(dimethylamino)-methyl]phenol), and 1-cyanoethyl-2-methyl-4-methylimidazolium.

[0042] According to a preferred embodiment of the present invention, the epoxy curing accelerator is DBU.

[0043] According to a preferred embodiment of the present invention, in the composition, component A comprises 62-80 parts by weight of bisphenol F type epoxy resin NPEF-175, 8-16 parts by weight of polyether modified epoxy resin EP-4000, 8-13 parts by weight of glycerol triglycidyl ether, and 0.6-1 parts by weight of polysiloxane coupling agent KH-560; component B comprises 28-36 parts by weight of alicyclic amine curing agent EC331 and 1.2-2.2 parts by weight of DBU; the weight ratio of component A to component B is 100:(30-35). This allows the composition to be cured at below 90°C for 2.5-3.5 hours to form a composite epoxy resin with excellent impact resistance, exhibiting an impact strength ≥80 KJ / m. 2 Flexural strength ≥120MPa, flexural modulus ≥2800MPa.

[0044] According to the present invention, the composition can be obtained by thoroughly mixing its components, and can exist in the form of a mixture, or the components can be packaged separately and mixed before use.

[0045] A second aspect of the present invention provides a composite epoxy resin, which is obtained by curing a raw material containing the composition described in the first aspect above.

[0046] The curing reaction conditions include: a reaction temperature of 70-90℃ and a reaction time of 2-4 hours.

[0047] According to a preferred embodiment of the present invention, the composite epoxy resin can be prepared using the composition provided by the present invention through the following steps:

[0048] (1) The components contained in component A of the composition are first mixed to obtain component A; and the components contained in component B of the composition are second mixed to obtain component B;

[0049] (2) Mix component A and component B in a third process to obtain a reaction system. Then, perform degassing and curing reactions on the reaction system in sequence to obtain the composite epoxy resin.

[0050] The mixing temperatures of the first, second, and third mixtures are selected to ensure good dispersion of the components, facilitate addition, and achieve uniform mixing. Preferably, the first, second, and third mixtures are carried out in the range of 80-100°C. Preferably, the first, second, and third mixtures are carried out at atmospheric pressure.

[0051] In this invention, atmospheric pressure refers to one standard atmosphere, or a conventional pressure that does not require additional pressure to be applied to the reactor.

[0052] According to the present invention, the composite epoxy resin has a low initial viscosity, which is beneficial for better defoaming and better fiber wetting. Preferably, the initial viscosity of the composite epoxy resin at 25°C is ≤1000cps, and more preferably 400-900cps.

[0053] In this invention, the initial viscosity of the epoxy resin is determined according to the method specified in ASTM D-2983 and using a Brookfield viscometer.

[0054] According to the present invention, the composite epoxy resin exhibits excellent impact strength. Preferably, the impact strength of the composite epoxy resin is ≥60 KJ / m. 2 Further preferred is 65-90 KJ / m 2 .

[0055] In this invention, the impact strength of epoxy resin is determined according to the method specified in GB / T 1043.2-2018.

[0056] According to the present invention, the composite epoxy resin has good toughness. Preferably, the flexural strength of the composite epoxy resin is ≥110 MPa, more preferably 111-120 MPa.

[0057] Preferably, the flexural modulus of the composite epoxy resin is ≥2700MPa, and more preferably 2800-3000MPa.

[0058] In this invention, the flexural strength and flexural modulus of the epoxy resin are determined according to the methods specified in GB / T 2567-2021.

[0059] The composite epoxy resin provided by this invention has excellent impact resistance, good toughness, and good fiber wettability. As an epoxy resin matrix for fiber composite materials, it can improve the impact resistance of composite materials and can well meet the performance requirements of the flywheel for the epoxy resin material in the winding layer in flywheel energy storage technology.

[0060] A third aspect of the present invention provides the use of the composition described in the first aspect in impregnating fibers, wherein the fibers are fibers for winding flywheels.

[0061] According to the present invention, after mixing components A and B in the composition provided by the present invention, the mixture is used to impregnate fibers (e.g., carbon fibers), followed by a curing reaction to form the winding layer of a flywheel. Because the curing temperature of the composition provided by the present invention is relatively low, the risk of flywheel cracking during preparation can be significantly reduced. Furthermore, the working time of the composition before curing (the viscosity of each component in the composition increases to 5000 cps after mixing) is relatively long (reaching 400-600 min), thus facilitating the production of larger flywheels. The composite epoxy resin formed by curing the composition exhibits excellent impact resistance, which can improve the fatigue resistance and limiting speed of the flywheel under load.

[0062] A fourth aspect of the present invention provides a flywheel, characterized in that the flywheel includes a magnetic bearing and a winding layer; wherein the winding layer contains fibers and the composite epoxy resin described in the second aspect above.

[0063] The flywheel provided by the present invention has a winding layer formed by impregnating fibers (e.g., carbon fibers) with the composition described in the present invention and then performing a curing reaction, which has the advantages of excellent fatigue resistance under load and high limiting speed.

[0064] The present invention will be described in detail below through examples. Unless otherwise specified, the following examples and comparative examples are all conventional methods; the reagents and materials mentioned are commercially available unless otherwise specified.

[0065] Bisphenol A type epoxy resins: CYD-127 (epoxy value 0.53, viscosity at 25℃ 8870cps) and CYD-128 (epoxy value 0.52, viscosity at 25℃ 11000cps), purchased from Sinopec Hunan Petrochemical Co., Ltd.

[0066] Hydrogenated bisphenol A type epoxy resin: CYDH-300 (epoxy value 0.43, viscosity at 25℃ 2800cps), purchased from Sinopec Hunan Petrochemical Co., Ltd.; XY518 (epoxy value 0.45, viscosity at 25℃ 2240cps), purchased from Complex High-Tech Materials (Shanghai) Co., Ltd.

[0067] Bisphenol F type epoxy resins: NPEF-175 (epoxy value 0.58, viscosity at 25℃ 3000cps), NPEF-180 (epoxy value 0.55, viscosity at 25℃ 6000cps), NPEF-185 (epoxy value 0.56, viscosity at 25℃ 7000cps), purchased from Nan Ya Plastics Industrial Co., Ltd.

[0068] Phenolic epoxy resins: NPPN-631 (epoxy value 0.57, viscosity at 50℃ 1500cps) and NPPN-638 (epoxy value 0.55, viscosity at 70℃ 1200cps), purchased from Nan Ya Plastics Industrial Co., Ltd.

[0069] Polyether-modified epoxy resins: EP-4000 (epoxy value 0.21, viscosity at 25℃ 4500cps) and EP-1307 (epoxy value 0.15, viscosity at 25℃ 25000cps), purchased from Complex High-Tech Materials (Shanghai) Co., Ltd.

[0070] Epoxy diluents: trimethylolpropane triglycidyl ether, propoxyglycerol triglycidyl ether, glycerol triglycidyl ether, pentaerythritol tetraglycidyl ether and sorbitol glycidyl ether, purchased from Anhui Xinyuan Technology Co., Ltd.

[0071] Fiber impregnation auxiliaries: KH-560, BYK-C 8001, BYK-P 9912, BYK-P 9920, purchased from Hong Kong Haiyi Enterprise Development Co., Ltd.

[0072] Amine curing agents: aminoethylpiperazine, m-phenylenediamine, triethylenetetramine, EC201, EC280, EC331, H-100S, JH-5150, Ethacure 200, Ethacure 300, purchased from Shenzhen Jiadida New Material Technology Co., Ltd.

[0073] Epoxy curing accelerators: DBU, DMP-20, 1-cyanoethyl-2-methyl-4-methylimidazole, purchased from Sinopharm Chemical Reagent Co., Ltd.

[0074] Example 1

[0075] (1) Component A: 85 parts of bisphenol F type epoxy resin NPEF-175, 10 parts of polyether modified epoxy resin EP-4000, 5 parts of epoxy resin diluent glycerol triglycidyl ether, and 0.6 parts of fiber impregnating agent BYK-P 9912 were added to the reaction vessel in sequence and heated to 80°C under normal pressure; stirred for 1 hour until homogeneous, and after the resin mixture cooled to room temperature, component A was obtained;

[0076] Component B: 30 parts of aromatic amine curing agent Ethacure200 and 5 parts of JH-5150 are added to the reaction vessel in sequence and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; the above quantities "parts" refer to parts by weight.

[0077] (2) Curing: Mix component A and component B at a mass ratio of 100:35 and degas under vacuum. After injecting into the mold, cure at 70°C for 1 hour and at 90°C for 2 hours to obtain composite epoxy resin (denoted as P1).

[0078] Example 2

[0079] (1) Component A: 40 parts of bisphenol A type epoxy resin CYD-128, 10 parts of bisphenol F type epoxy resin NPEF-180, 30 parts of polyether modified epoxy resin EP-4000, 20 parts of epoxy resin diluent propoxyglycerol triglycidyl ether, and 1 part of fiber impregnating agent BYK-P 9912 were added to the reaction vessel in sequence, heated to 80°C under normal pressure and stirred for 1 hour until homogeneous. After the resin mixture cooled to room temperature, component A was obtained.

[0080] Component B: 35 parts of aromatic amine curing agent Ethacure 300 and 3 parts of accelerator DMP-20 were added to the reaction vessel in sequence and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; the above quantities "parts" refer to parts by weight.

[0081] (2) Mix component A and component B at a mass ratio of 100:38 and degas under vacuum. After injecting into the mold, cure at 90°C for 3 hours to obtain composite epoxy resin (denoted as P2).

[0082] Example 3

[0083] (1) Component A: 50 parts of bisphenol F type epoxy resin NPEF-185, 25 parts of hydrogenated bisphenol A type epoxy resin XY-518, 25 parts of polyether modified epoxy resin EP-1307, 10 parts of epoxy resin diluent trimethylolpropane triglycidyl ether, and 1 part of fiber impregnating agent BYK-P 9920 were added to the reaction vessel in sequence, heated to 80°C under normal pressure and stirred for 1 hour until homogeneous. After the resin mixture cooled to room temperature, component A was obtained.

[0084] Component B: 38 parts of alicyclic amine curing agent EC331 and 1 part of accelerator DBU were added to the reactor in sequence and stirred at room temperature under normal pressure for 1 hour until homogeneous to obtain component B; the above quantities "parts" all refer to parts by weight.

[0085] (2) Mix component A and component B at a mass ratio of 100:39 and degas under vacuum. After injecting into the mold, cure at 80°C for 2 hours and at 90°C for 1 hour to obtain composite epoxy resin (denoted as P3).

[0086] Example 4

[0087] (1) Component A: 50 parts of bisphenol F type epoxy resin CYD-127, 10 parts of phenolic epoxy resin NPPN-631, 30 parts of polyether modified epoxy resin EP-1307, 10 parts of epoxy resin diluent trimethylolpropane triglycidyl ether, and 1.3 parts of fiber impregnating agent BYK-P 9912 were added to the reaction vessel in sequence, heated to 80°C under normal pressure and stirred for 1 hour until uniform. After the resin mixture was cooled to room temperature, component A was obtained.

[0088] Component B: 25 parts of polyamide curing agent JH-5150, 10 parts of aromatic amine curing agent Ethacure 300 and 1 part of accelerator 1-cyanoethyl-2-methyl-4-methylimidazolium are added to the reaction vessel in sequence and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; the above quantities "parts" refer to parts by weight.

[0089] (2) Mix component A and component B at a mass ratio of 100:36 and degas under vacuum. After injecting into the mold, cure at 90°C for 2 hours to obtain composite epoxy resin (denoted as P4).

[0090] Example 5

[0091] (1) Component A: 40 parts of bisphenol A type epoxy resin CYD-128, 40 parts of phenolic epoxy resin NPPN-638, 20 parts of epoxy resin diluent pentaerythritol tetraglycidyl ether and 0.6 parts of fiber impregnating agent BYK-C8001 were added to the reaction vessel in sequence, heated to 80°C under normal pressure and stirred for 1 hour until homogeneous. After the resin mixture cooled to room temperature, component A was obtained.

[0092] Component B: 5 parts of the aromatic amine curing agent m-phenylenediamine, 34 parts of Ethacure 200 and 1 part of the accelerator N-methylimidazole were added to the reaction vessel in sequence and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; the above quantities "parts" refer to parts by weight.

[0093] (2) Mix component A and component B at a mass ratio of 100:40 and degas under vacuum. After injecting into the mold, cure at 90°C for 3 hours to obtain composite epoxy resin (denoted as P5).

[0094] Example 6

[0095] (1) Component A: 85 parts of bisphenol F type epoxy resin NPEF-175, 5 parts of polyether modified epoxy resin EP-4000, 10 parts of epoxy resin diluent glycerol triglycidyl ether, and 1.3 parts of fiber impregnating agent BYK-C 8001 were added to the reaction vessel in sequence, heated to 80°C under normal pressure and stirred for 1 hour until uniform. After the resin mixture cooled to room temperature, component A was obtained.

[0096] Component B: 5 parts of triethylenetetramine (a fatty amine curing agent), 32 parts of aromatic amine EC331, and 3 parts of accelerator DMP-20 were added sequentially to the reaction vessel and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; all the above quantities "parts" refer to parts by weight.

[0097] (2) Mix component A and component B at a mass ratio of 100:40 and degas under vacuum. After injecting into the mold, cure at 70°C for 1 hour and at 90°C for 2 hours to obtain composite epoxy resin (denoted as P6).

[0098] Example 7

[0099] (1) Component A: 40 parts of bisphenol F type epoxy resin NPEF-175, 30 parts of phenolic epoxy resin NPPN-631, 15 parts of polyether modified epoxy resin EP-1307, 15 parts of epoxy resin diluent pentaerythritol tetraglycidyl ether, and 1 part of fiber impregnating agent BYK-P 9920 were added to the reaction vessel in sequence, heated to 80°C under normal pressure and stirred for 1 hour until uniform. After the resin mixture cooled to room temperature, resin A was obtained.

[0100] Component B: 10 parts of alicyclic amine curing agent aminoethylpiperazine, 29 parts of Ethacure 200 and 1 part of accelerator DBU were added to the reaction vessel in sequence and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; the above quantities "parts" refer to parts by weight.

[0101] (2) Mix component A and component B at a mass ratio of 100:40 and degas under vacuum. After injecting into the mold, cure at 70°C for 3 hours to obtain composite epoxy resin (denoted as P7).

[0102] Example 8

[0103] (1) Component A: 45 parts of bisphenol A type epoxy resin CYD-127, 25 parts of hydrogenated bisphenol A type epoxy resin XY-518, 15 parts of polyether modified epoxy resin EP-1307, 15 parts of epoxy resin diluent sorbitol glycidyl ether and 1 part of fiber impregnating agent KH-560 were added to the reaction vessel in sequence, heated to 80°C under normal pressure and stirred for 1 hour until uniform. After the resin mixture was cooled to room temperature, component A was obtained.

[0104] Component B: 5 parts of alicyclic amine curing agent H-100S, 34 parts of aromatic amine curing agent Ethacure 300, and 3 parts of accelerator 1-cyanoethyl-2-methyl-4-methylimidazolium were added sequentially to the reaction vessel and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; all the above quantities "parts" refer to parts by weight.

[0105] (2) Mix component A and component B at a mass ratio of 100:40 and degas under vacuum. After injecting into the mold, cure at 80°C for 3 hours to obtain composite epoxy resin (denoted as P8).

[0106] Example 9

[0107] (1) Component A: 50 parts of bisphenol F type epoxy resin NPEF-175, 20 parts of phenolic epoxy resin NPPN-638, 25 parts of polyether modified epoxy resin EP-4000, 5 parts of epoxy resin diluent trimethylolpropane triglycidyl ether and 1.3 parts of fiber impregnating agent BYK-C 8001 were added to the reaction vessel in sequence, heated to 80°C under normal pressure and stirred for 1 hour until uniform. After the resin mixture was cooled to room temperature, component A was obtained.

[0108] Component B: 15 parts of polyamide curing agent JH-5150 and 1 part of accelerator N-methylimidazole were added to the reaction vessel in sequence and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; the above quantities "parts" refer to parts by weight.

[0109] (2) Mix component A and component B at a mass ratio of 100:16 and degas under vacuum. After injecting into the mold, cure at 90°C for 3 hours to obtain composite epoxy resin (denoted as P9).

[0110] Example 10

[0111] (1) Component A: 40 parts of bisphenol A type epoxy resin CYD-128, 45 parts of bisphenol F type epoxy resin NPEF-175, 5 parts of polyether modified epoxy resin EP-1307, 10 parts of epoxy resin diluent propoxyglycerol triglycidyl ether, and 0.6 parts of fiber impregnating agent KH-560 were added to the reaction vessel in sequence. The mixture was heated to 80°C under normal pressure and stirred for 1 hour until homogeneous. After the resin mixture was cooled to room temperature, component A was obtained.

[0112] Component B: 25 parts of fatty amine curing agent EC280, 10 parts of aromatic amine curing agent Ethacure 300, and 1 part of accelerator 1-cyanoethyl-2-methyl-4-methylimidazolium were added sequentially to the reaction vessel and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; all the above quantities "parts" refer to parts by weight.

[0113] (2) Mix component A and component B at a mass ratio of 100:36 and degas under vacuum. After injecting into the mold, cure at 70°C for 1 hour and at 90°C for 1 hour to obtain composite epoxy resin (denoted as P10).

[0114] Example 11

[0115] The method of Example 10 was followed, except that propoxyglycerol triglycidyl ether was replaced with an equal weight of pentaerythritol tetraglycidyl ether, and all other steps and conditions were the same as in Example 10, to obtain a composite epoxy resin (denoted as P11).

[0116] Example 12

[0117] The method of Example 10 was followed, except that 25 parts of aliphatic amine curing agent EC280 and 10 parts of aromatic amine curing agent Ethacure 300 were replaced with 35 parts of polyamide curing agent JH-5150. All other steps and conditions were the same as in Example 10, and a composite epoxy resin (denoted as P12) was obtained.

[0118] Example 13

[0119] (1) Component A: 75 parts of bisphenol F type epoxy resin NPEF-175, 12 parts of polyether modified epoxy resin EP-4000, 12.4 parts of epoxy resin diluent glycerol triglycidyl ether, and 0.6 parts of fiber impregnating agent KH-560 were added to the reaction vessel in sequence and heated to 80°C under normal pressure; stirred for 1 hour until homogeneous, and after the resin mixture cooled to room temperature, component A was obtained;

[0120] Component B: 30 parts of alicyclic amine curing agent EC331 and 2 parts of DBU were added to the reaction vessel in sequence and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; the above quantities "parts" refer to parts by weight.

[0121] (2) Curing: Mix component A and component B at a mass ratio of 100:32 and degas under vacuum. After injecting into the mold, cure at 70°C for 1 hour and at 90°C for 2 hours to obtain composite epoxy resin (denoted as P13).

[0122] Comparative Example 1

[0123] (1) Component A: 90 parts of bisphenol A type epoxy resin CYD-128, 10 parts of bisphenol F type epoxy resin NPEF-175 and 0.6 parts of fiber impregnating agent BYK-P 9912 were added to the reaction vessel in sequence, heated to 80°C under normal pressure and stirred for 1 hour until homogeneous. After the resin mixture was cooled to room temperature, component A was obtained.

[0124] Component B: 30 parts of alicyclic amine curing agent EC201 and 10 parts of aromatic amine curing agent Ethacure 300 were added sequentially to the reaction vessel and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; the above quantities "parts" refer to parts by weight.

[0125] (2) Mix component A and component B at a mass ratio of 100:40 and degas under vacuum. After injecting into the mold, heat to 100°C for 2 hours and then heat to 140°C for 2 hours to obtain composite epoxy resin (denoted as DP1).

[0126] Comparative Example 2

[0127] (1) Component A: 60 parts of bisphenol F type epoxy resin NPEF-175, 30 parts of polyether modified epoxy resin EP-4000, 10 parts of ethylene glycol diglycidyl ether (bifunctional epoxy diluent) and 0.6 parts of fiber impregnating agent BYK-P 9912 were added to the reaction vessel in sequence, heated to 80°C under normal pressure and stirred for 1 hour until uniform. After the resin mixture was cooled to room temperature, component A was obtained.

[0128] Component B: 30 parts of triethylenetetramine, a fatty amine curing agent, and 10 parts of m-phenylenediamine, an aromatic amine curing agent, are added sequentially to the reaction vessel and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; all the above quantities "parts" refer to parts by weight.

[0129] (2) Mix component A and component B at a mass ratio of 100:40 and degas under vacuum. After injecting into the mold, heat to 100°C for 4 hours and then heat to 140°C for 4 hours to obtain composite epoxy resin (denoted as DP2).

[0130] Comparative Example 3

[0131] The method of Example 10 was followed, except that components A and B were mixed evenly at a mass ratio of 100:45 and vacuum degassed. After being injected into the mold, the mixture was cured at 70°C for 1 hour and at 90°C for 1 hour. All other steps and conditions were the same as in Example 10, and a composite epoxy resin (denoted as DP3) was obtained.

[0132] Comparative Example 4

[0133] (1) Component A: 40 parts of bisphenol A type epoxy resin CYD-128, 45 parts of bisphenol F type epoxy resin NPEF-175, 5 parts of polyether modified epoxy resin EP-1307, 10 parts of epoxy resin diluent propoxyglycerol triglycidyl ether, and 0.6 parts of fiber impregnating agent KH-560 were added to the reaction vessel in sequence. The mixture was heated to 80°C under normal pressure and stirred for 1 hour until homogeneous. After the resin mixture was cooled to room temperature, component A was obtained.

[0134] Component B: 85 parts of curing agent methyltetrahydrophthalic anhydride and 1 part of accelerator 1-cyanoethyl-2-methyl-4-methylimidazolium are added to the reaction vessel in sequence and stirred at room temperature and pressure for 1 hour until homogeneous to obtain component B; the above quantities "parts" refer to parts by weight.

[0135] (2) Mix component A and component B at a mass ratio of 100:86 and degas under vacuum. After injecting into the mold, cure at 100℃ for 1 hour, 150℃ for 1 hour and 180℃ for 1 hour in sequence to obtain composite epoxy resin (denoted as DP1).

[0136] Test case

[0137] The initial viscosity, flexural strength, flexural modulus and impact strength of the composite epoxy resins P1-P13 and DP1-DP4 prepared in the above embodiments and comparative examples were tested, and the results are shown in Table 1.

[0138] Table 1

[0139]

[0140] As shown in Table 1, the compositions of Examples 1-13 can form composite epoxy resins after curing at a relatively low temperature of 70-90°C, with a curing time not exceeding 3 hours. The resulting composite epoxy resins P1-P13 have an impact strength higher than 60 KJ / m. 2 It exhibits an initial viscosity below 1000 cps at 25°C, a flexural strength above 110 MPa, and a flexural modulus above 2700 MPa. It also possesses excellent impact resistance and good toughness. As an epoxy resin matrix, it can improve the impact resistance of carbon fiber composites, thereby enhancing the fatigue resistance and limiting speed of flywheels. The composite epoxy resins formed after curing the compositions of Comparative Examples 1-4 do not possess the aforementioned comprehensive properties.

[0141] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A composition, characterized in that, The composition comprises: component A and component B, wherein the weight ratio of component A to component B is 100:(15-40); wherein, Component A comprises 50-85 parts by weight of matrix epoxy resin, 0-30 parts by weight of polyether modified epoxy resin, 5-20 parts by weight of 3-4 functional group epoxy diluent and 0.3-1.5 parts by weight of fiber impregnation aid. Component B includes 15-40 parts by weight of an amine curing agent and 0-3 parts by weight of an epoxy curing accelerator.

2. The composition according to claim 1, wherein, The weight ratio of component A to component B is 100:(25-38); And / or, component A comprises 60-82 parts by weight of matrix epoxy resin, 6-28 parts by weight of polyether modified epoxy resin, 6-18 parts by weight of 3-4 functional group epoxy diluent and 0.5-1.2 parts by weight of fiber impregnation aid. And / or, component B comprises 25-38 parts by weight of an amine curing agent and 1-2.5 parts by weight of an epoxy curing accelerator.

3. The composition according to claim 1 or 2, wherein, The epoxy value of the matrix epoxy resin is 0.4-0.65; And / or, the viscosity of the matrix epoxy resin at 25°C is 1200-20000 cps.

4. The composition according to any one of claims 1-3, wherein, The epoxy value of the polyether-modified epoxy resin is 0.15-0.35; And / or, the viscosity of the polyether-modified epoxy resin at 25°C is 3000-30000 cps.

5. The composition according to any one of claims 1-4, wherein, The 3-4 functional group epoxy diluent is a glycidyl ether diluent; Preferably, the 3-4 functional group epoxy diluent is selected from at least one of trimethylolpropane triglycidyl ether, propoxyglycerol triglycidyl ether, glycerol triglycidyl ether, pentaerythritol tetraglycidyl ether, and sorbitol glycidyl ether. And / or, the fiber impregnation aid is selected from at least one of polysiloxane coupling agents, titanate coupling agents, and aluminate coupling agents.

6. The composition according to any one of claims 1-5, wherein, The amine curing agent is selected from at least one of aliphatic amines, polyamides, alicyclic amines, and aromatic amines; And / or, the epoxy curing accelerator is selected from at least one of tertiary amines and their salts, imidazoles and their salts, triphenylphosphine and quaternary ammonium salts.

7. A composite epoxy resin, characterized in that, The composite epoxy resin is prepared by curing a raw material containing the composition of any one of claims 1-6; The curing reaction conditions include: a reaction temperature of 70-90℃ and a reaction time of 2-4 hours.

8. The composite epoxy resin according to claim 7, wherein, The initial viscosity of the composite epoxy resin at 25°C is ≤1000cps, preferably 400-900cps; And / or, the impact strength of the composite epoxy resin is ≥60KJ / m 2 Preferably 65-90 KJ / m 2 ; And / or, the flexural strength of the composite epoxy resin is ≥110MPa, preferably 111-120MPa; And / or, the flexural modulus of the composite epoxy resin is ≥2700MPa, preferably 2800-3000MPa.

9. The use of the composition according to any one of claims 1-6 in impregnated fibers, wherein, The fiber is a fiber used for winding flywheels.

10. A flywheel, characterized in that, The flywheel includes a magnetic bearing and a winding layer; wherein the winding layer contains fibers and the composite epoxy resin as described in claim 7 or 8.

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