Cold-resistant impact-resistant epoxy resin composition, prepreg, and laminate

Abstract

The application discloses a cold-resistant and impact-resistant epoxy resin composition, a prepreg and a laminated board. The cold-resistant and impact-resistant epoxy resin composition comprises the following components in parts by mass: weather-resistant epoxy resin 100 parts, ethylene-glycidyl methacrylate copolymer 20-40 parts, ethylene acrylate rubber 10-30 parts, curing agent 5-30 parts, accelerator 0.1-1 part and solvent 50-100 parts. The weather-resistant epoxy resin is selected from at least one of an alicyclic epoxy resin and an aliphatic epoxy resin. The AEM rubber and the E-GMA copolymer with low brittleness temperature and excellent impact strength are compounded with the weather-resistant epoxy resin to prepare the weather-resistant epoxy resin composition with high impact strength under low temperature conditions, and the reliability of products prepared from the composition under severe cold conditions is improved.

Description

TECHNICAL FIELD

[0001] The present solution belongs to the technical field of epoxy resin composites, and particularly relates to a cold-resistant and impact-resistant epoxy resin composition, a prepreg and a laminate. BACKGROUND

[0002] Epoxy resin composites, as a kind of high-performance materials, have shown a wide application potential in outdoor products such as automobile and aircraft part housings, building materials, outdoor equipment, etc. These products are long-term exposed to complex and changeable outdoor environments, not only having to withstand severe conditions such as ultraviolet radiation, high and low temperature alternation, salt spray corrosion, physical scratching, etc., but also facing the severe challenges of extremely low temperature, thin air, strong ultraviolet and ozone, etc. in high latitude and high altitude areas. Epoxy resin, due to its good adhesion, insulation, corrosion resistance and molding processability, has become one of the important choices for outdoor product materials. However, the rigid structure and symmetric structure characteristics of epoxy resin result in its greater brittleness, which has obvious short board in impact resistance and cold resistance, limiting its application effect in extreme environments.

[0003] In order to overcome these limitations of epoxy resin, researchers and engineers have been committed to improving the comprehensive performance of epoxy resin composites, especially the performance in impact resistance and cold resistance, through modification, reinforcement, etc.

[0004] In terms of impact resistance improvement, the strategies usually adopted by researchers include adding elastomers, rubber particles, thermoplastic resins, etc. toughening agents, and introducing nano fillers such as nano clay, nano silicon dioxide, etc. These measures can effectively disperse the stress inside the epoxy resin and increase the toughness of the material. For example, by blending modification technology, epoxy resin can be blended with thermoplastic polyurethane (TPU), which can significantly improve the impact strength of the composite material, while maintaining good heat resistance and chemical corrosion resistance. In addition, by using interpenetrating polymer network (IPN) technology, epoxy resin and another polymer network are interpenetrated to form a three-dimensional network structure, which can also effectively improve the toughness of the material, so that it has better energy absorption and dispersion capacity when facing external impact.

[0005] In terms of cold resistance, improving the low-temperature brittleness of epoxy resin composites is another major challenge. Traditional epoxy resins tend to become brittle at low temperatures, leading to a significant decrease in mechanical properties. To improve their cold resistance, researchers have developed various strategies, such as introducing epoxy resin monomers containing flexible chain segments, using plasticizers that remain flexible at low temperatures, and reducing the glass transition temperature (Tg) of the material through chemical crosslinking structure adjustment. Among them, the introduction of curing agents and crosslinking agents with low-temperature activity, such as amine or anhydride curing agents containing flexible aliphatic long chains, can effectively reduce the Tg of epoxy resin composites, allowing them to maintain sufficient flexibility and mechanical strength in low-temperature environments. In addition, the synthesis of epoxy resins with specific structures through molecular design, such as polyether or polyester containing epoxidized functional groups, can also significantly improve the low-temperature performance of the material.

[0006] However, the above-mentioned prior art methods can only improve a single property of epoxy resin composites, and cannot simultaneously impart excellent performance in both impact resistance and cold resistance to epoxy resin composites, i.e., achieving comprehensive improvement in both impact resistance and high cold resistance. SUMMARY

[0007] The present solution aims to overcome at least one of the deficiencies in the prior art, providing a cold-resistant and impact-resistant epoxy resin composition to address the problems of insufficient impact resistance and cold resistance of epoxy resins, and to improve the reliability of epoxy resin composites in cold conditions.

[0008] To solve the above technical problems, the following technical solutions are adopted:

[0009] In a first aspect, a cold-resistant and impact-resistant epoxy resin composition and a method for preparing the same are provided. The composition comprises, by mass fraction: 100 parts of weather-resistant epoxy resin, 20-40 parts of ethylene-glycidyl methacrylate copolymer (E-GMA copolymer), 10-30 parts of ethylene acrylate rubber (AEM rubber), 5-30 parts of curing agent, 0.1-1 parts of accelerator, and 50-100 parts of solvent. The weather-resistant epoxy resin is selected from at least one of alicyclic epoxy resin and aliphatic epoxy resin.

[0010] This composition selects weather-resistant epoxy resin, ethylene-glycidyl methacrylate copolymer (E-GMA copolymer), and ethylene acrylate rubber (AEM rubber) as the main materials, which do not contain unsaturated structures, thereby imparting excellent weather resistance to the composition. This means that it can effectively resist the erosion of harsh environmental factors such as ultraviolet light, ozone, extreme high and low temperatures, and salt spray, ensuring the long-term stability and service life of the material under outdoor or harsh conditions.

[0011] More importantly, the E-GMA copolymer can not only be co-cured with the weather-resistant epoxy resin, but also be well compatible with the AEM rubber, so that the AEM rubber which does not participate in the curing reaction can be uniformly distributed in the epoxy resin and the E-GMA cured product during the curing process of the composition, forming a two-phase structure of rubber dispersed phase and thermosetting continuous phase. This structure enables the material to more effectively disperse and absorb impact energy when impacted, ensuring that the material remains in good integrity and structural stability after being impacted. Specifically, when the cured product is impacted, the relatively brittle epoxy cured product cracks first, and the relatively flexible E-GMA segment has a certain buffer effect on the crack and disperses it. When the crack passes through the relatively tough rubber dispersed phase, the rubber dispersed phase absorbs impact energy due to stress concentration and then terminates the crack propagation. Moreover, thanks to the low brittle temperature of the rubber dispersed phase and E-GMA, the material can still maintain excellent toughness under low temperature conditions. This means that even in cold winter or extreme low temperature environments, it can still maintain sufficient strength and impact resistance, thereby avoiding performance degradation or damage due to low temperature embrittlement.

[0012] In summary, the above-mentioned cold-resistant and impact-resistant epoxy resin composition realizes excellent weather resistance, impact resistance and low temperature toughness through careful design of component ratio and unique two-phase structure formed after curing, providing an ideal material selection for various application scenarios that require high reliability and long-term stability.

[0013] Preferably, the weather-resistant epoxy resin is at least one selected from bis((3,4-epoxycyclohexyl)methyl)hexanedioate, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate and a polymerization product of caprolactone, 4,5-epoxycyclohexane-1,2-dicarboxylic acid diglycidyl ester, 4-vinyl-1-cyclohexene diepoxide, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, hexahydrophthalic acid diglycidyl ester, and 1,4-cyclohexane dimethanol bis(3,4-epoxycyclohexane carboxylate).

[0014] Preferably, the ethylene-glycidyl methacrylate copolymer is at least one selected from ethylene-glycidyl methacrylate binary copolymer, ethylene-glycidyl methacrylate-vinyl acetate ternary copolymer, ethylene-glycidyl methacrylate-methyl acrylate ternary copolymer, such as Japan Sumitomo BF-E, Japan Sumitomo BF-7B, Japan Sumitomo BF-7M, Arlanxeo Levapren NPG VP, etc.

[0015] Preferably, the ethylene acrylate rubber is selected from at least one of ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-methoxy ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-butyl methacrylate copolymer, ethylene-methoxy ethyl methacrylate copolymer, such as DuPont VAMAC VMX4017, DuPont VAMAC DP, DuPont VAMAC Ultra LT, etc.

[0016] Preferably, the curing agent is selected from at least one of aliphatic polyamine curing agent, aromatic amine curing agent, polyamide curing agent, hydrazide curing agent. More preferably, the curing agent is selected from aliphatic polyamine curing agent or aromatic amine curing agent having two or more amine groups in the molecular structure, such as 4,4'-diamino diphenyl sulfone, p-aminodiphenyl methane, dicyandiamide, etc.

[0017] Preferably, the accelerator is selected from at least one of 2-methyl imidazole, 2-ethyl-4-methyl imidazole.

[0018] Preferably, the solvent is selected from at least one of acetone, butanone, N,N-dimethylformamide, cyclohexanone, propylene glycol methyl ether, ethylene glycol methyl ether, toluene.

[0019] If necessary, the above composition can also be added with additives common in the art, such as other thermosetting resins, thermoplastic resins, ultraviolet absorbers, antioxidants, flame retardants, coupling agents, fillers, surfactants, etc., without impairing the original properties of the resin composition.

[0020] The above cold-resistant impact-resistant epoxy resin composition can be prepared by sequentially adding solvent 50-100 parts, weather-resistant epoxy resin 100 parts, ethylene-glycidyl methacrylate copolymer 20-40 parts, ethylene acrylate rubber 10-30 parts, curing agent 5-30 parts, accelerator 0.1-1 part into a container, and stirring uniformly.

[0021] In a second aspect, a cold-resistant impact-resistant epoxy resin prepreg and a method for preparing the same are provided. The prepreg comprises a reinforcing body and a resin matrix attached to the reinforcing body, and the resin matrix is prepared from the above cold-resistant impact-resistant epoxy resin composition.

[0022] The cold-resistant impact-resistant epoxy resin composition used in the prepreg is prepared by compounding weather-resistant epoxy resin, ethylene-glycidyl methacrylate copolymer (E-GMA copolymer) and ethylene acrylate rubber (AEM rubber), so that the prepared prepreg has excellent weather resistance, impact resistance and low-temperature toughness, providing an ideal material selection for various application scenarios requiring high reliability and long-term stability.

[0023] The material of the reinforcing body is not limited, and can be made of at least one of plant fiber, animal fiber, mineral fiber, and synthetic fiber. Preferably, the reinforcing body is selected from at least one of glass fiber cloth, glass fiber mat, glass fiber paper, unidirectional glass fiber, basalt fiber cloth, unidirectional basalt fiber, carbon fiber cloth, unidirectional carbon fiber, aramid cloth, and aramid paper.

[0024] The cold-resistant impact-resistant epoxy resin prepreg can be prepared by impregnating the reinforcing body with the cold-resistant impact-resistant epoxy resin composition and drying in an oven at 150±5℃ for 3±1min.

[0025] In a third aspect, a cold-resistant impact-resistant epoxy resin laminate and a preparation method thereof are provided. The laminate comprises at least one cold-resistant impact-resistant epoxy resin prepreg as described above.

[0026] The cold-resistant impact-resistant epoxy resin prepreg used in the laminate has excellent weather resistance, impact resistance, and low-temperature toughness, and the laminate prepared therefrom can be applied to various application scenarios that require high reliability and long-term stability.

[0027] The cold-resistant impact-resistant epoxy resin laminate can be prepared by combining the cold-resistant impact-resistant epoxy resin prepreg with other prepregs, or combining a plurality of cold-resistant impact-resistant epoxy resin prepregs into a stack, covering each side of the stack with a PET release film, feeding into a fast press at 130℃-180℃, increasing the pressure to 100psi-400psi, maintaining the temperature and pressure for 10min-30min, taking out the material, cooling to room temperature, and tearing off the PET release films on both sides.

[0028] Compared with the prior art, the present scheme has the following beneficial effects: The present scheme selects weather-resistant epoxy resin, ethylene-glycidyl methacrylate copolymer (E-GMA copolymer), and ethylene acrylate rubber (AEM rubber) as the main materials, which do not contain unsaturated structures, thereby endowing the composition with excellent weather resistance. This means that it can effectively resist the erosion of ultraviolet light, ozone, extreme high and low temperatures, and salt spray and other harsh environmental factors, ensuring the long-term stability and service life of the material under outdoor or harsh conditions.

[0029] More importantly, the E-GMA copolymer can not only be co-cured with the weather-resistant epoxy resin, but also be well compatible with the AEM rubber, so that the AEM rubber which does not participate in the curing reaction can be uniformly distributed in the epoxy resin and the E-GMA cured product during the curing process of the composition, forming a two-phase structure of rubber dispersed phase and thermosetting continuous phase. This structure enables the material to more effectively disperse and absorb impact energy when impacted, ensuring that the material can maintain good integrity and structural stability after being impacted. Specifically, when the cured product is impacted, the relatively brittle epoxy cured product cracks first, the relatively flexible E-GMA segment has a certain buffer effect on the crack and disperses it, and when the crack passes through the relatively tough rubber dispersed phase, the rubber dispersed phase absorbs impact energy due to stress concentration effect and then terminates the crack propagation. Moreover, thanks to the low brittle temperature of the rubber dispersed phase and E-GMA, the material can still maintain excellent toughness under low temperature conditions. This means that even in cold winter or extreme low temperature environment, it can still maintain sufficient strength and impact resistance, thereby avoiding performance degradation or damage due to low temperature embrittlement. DETAILED DESCRIPTION

[0030] The present application provides a cold-resistant and impact-resistant epoxy resin composition, prepreg and laminate. The cold-resistant and impact-resistant epoxy resin composition comprises, in mass parts, the following components: weather-resistant epoxy resin 100 parts, ethylene-glycidyl methacrylate copolymer 20-40 parts, ethylene acrylate rubber 10-30 parts, curing agent 5-30 parts, accelerator 0.1-1 part, and solvent 50-100 parts. The weather-resistant epoxy resin is selected from at least one of alicyclic epoxy resin and aliphatic epoxy resin.

[0031] The weather-resistant epoxy resin is preferably at least one of bis((3,4-epoxycyclohexyl)methyl)hexanedioate, a polymerization product of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate and caprolactone, 4,5-epoxycyclohexane-1,2-dicarboxylic acid diglycidyl ester, 4-vinyl-1-cyclohexene diepoxide, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, hexahydrophthalic acid diglycidyl ester, and 1,4-cyclohexanedimethanol bis(3,4-epoxycyclohexanecarboxylate).

[0032] The ethylene-glycidyl methacrylate copolymer (E-GMA copolymer) is preferably at least one of ethylene-glycidyl methacrylate binary copolymer, ethylene-glycidyl methacrylate-vinyl acetate ternary copolymer, and ethylene-glycidyl methacrylate-methyl acrylate ternary copolymer, such as Sumitomo BF-E, Sumitomo BF-7B, Sumitomo BF-7M, Arlanxeo Levapren NPG VP, etc.

[0033] The ethylene acrylate rubber (AEM rubber) is preferably at least one of ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-methoxy ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-butyl methacrylate copolymer, ethylene-methoxy ethyl methacrylate copolymer, such as DuPont VAMAC VMX4017, DuPont VAMAC DP, DuPont VAMAC Ultra LT, etc.

[0034] The curing agent is preferably at least one of aliphatic polyamine type curing agent, aromatic amine type curing agent, polyamide type curing agent, hydrazine type curing agent. More preferably, the curing agent is selected from aliphatic polyamine type curing agent or aromatic amine type curing agent containing two or more amine groups in the molecular structure, such as 4,4'-diamino diphenyl sulfone, p-aminodiphenyl methane, dicyandiamide, etc.

[0035] The accelerator is preferably at least one of 2-methyl imidazole, 2-ethyl-4-methyl imidazole.

[0036] The solvent is preferably at least one of acetone, butanone, N,N-dimethylformamide, cyclohexanone, propylene glycol methyl ether, ethylene glycol methyl ether, toluene.

[0037] If necessary, the above composition can also be added with additives common in the art, such as other thermosetting resins, thermoplastic resins, ultraviolet absorbers, antioxidants, flame retardants, coupling agents, fillers, surfactants, etc. without impairing the original properties of the resin composition.

[0038] The cold-resistant impact epoxy resin prepreg comprises a reinforcing body and a resin matrix attached to the reinforcing body, and the resin matrix is prepared by using the above cold-resistant impact epoxy resin composition.

[0039] The cold-resistant impact epoxy resin laminate comprises at least one of the above cold-resistant impact epoxy resin prepreg.

[0040] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below in conjunction with specific examples. The process methods used in the examples are conventional methods unless otherwise specified; the materials used are commercially available unless otherwise specified.

[0041] The weather-resistant epoxy resin is 3,4-epoxycyclohexylmethyl-3,4- epoxycyclohexylmethyl carboxylate (Huntsman CY179), bis((3,4- epoxycyclohexyl)methyl) adipate (Celloxide 2081), a polymerization product of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylmethyl carboxylate and caprolactone (Hunan Binghang New Material CF108128), 4,5-epoxycyclohexane-1,2-dicarboxylic acid diglycidyl ester (S-Nano S-186), 4-vinyl-1-cyclohexene diepoxide (Jiangsu Tetratex TTA 22), hexahydrophthalic acid diglycidyl ester (Tokyo Chemical Industry C1434), 1,4-cyclohexane dimethanol bis(3,4-epoxycyclohexane carboxylate) (Jiangsu Tetratex TTA 60). The E-GMA copolymer is Sumitomo Japan BF-7B; Sumitomo Japan BF-7B; Sumitomo Japan BF-7M; Arlanxeo Levapren NPG VP. The AEM rubber is DuPont VAMAC VMX4017; DuPont VAMAC DP; DuPont VAMAC Ultra LT. The curing agent is 4,4'-diaminodiphenyl sulfone (CAS#: 80-08-0), p-aminodiphenylmethane (CAS#: 101-77-9), dicyandiamide (CAS#: 461-58-5). The accelerator is 2-methylimidazole (CAS#: 693-98-1), 2-ethyl-4-methylimidazole (CAS#: 931-36-2). The solvent is butanone (CAS#: 78-93-3), acetone (CAS#: 67-64-1), N,N-dimethylformamide (CAS#: 68-12-2), cyclohexanone (CAS#: 108-94-1), propylene glycol methyl ether (CAS#: 107-98-2), ethylene glycol methyl ether (CAS#: 109-86-4), toluene (CAS#: 108-88-3). The control epoxy resin is bisphenol A type epoxy resin (NPEL-128, Nan Ya Plastics Corporation). The control rubber is PDMS silicone rubber (Dow Corning DC184), hydrogenated nitrile rubber (Zeon Japan HNBR 2020).

[0042] Example 1

[0043] In a container, 80 parts of butanone, 100 parts of 3,4-epoxycyclohexylmethyl-3,4- epoxycyclohexylmethyl carboxylate, 30 parts of Sumitomo Japan BF-7B, 20 parts of DuPont VAMAC VMX4017, 20 parts of 4,4'-diaminodiphenyl sulfone, and 0.5 parts of 2-methylimidazole were sequentially added, and stirred uniformly to obtain a cold-resistant impact epoxy resin composition.

[0044] 400 g / m2of the cold-resistant impact epoxy resin composition obtained was impregnated on a glass fiber cloth, and then dried to obtain a cold-resistant impact epoxy resin prepreg. 2The glass fiber cloth impregnated with the cold-resistant impact epoxy resin composition was dried in an oven at 150°C for 3 min to obtain a cold-resistant impact epoxy resin prepreg with a thickness of 0.4 mm.

[0045] Four pieces of the cold-resistant impact epoxy resin prepreg were combined into a stack, one piece of PET release film was covered on each side of the stack, and the stack was fed into a fast press at 150°C, the pressure was increased to 200 psi, and after constant temperature and pressure for 15 min, the material was taken out, the PET release films on both sides were torn off after cooling to room temperature, and a cold-resistant impact epoxy resin laminate with a thickness of 1.6 mm was obtained.

[0046] Example 2

[0047] In a container, 80 parts by mass of methyl ethyl ketone, 100 parts by mass of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, 20 parts by mass of Japanese Sumitomo BF-7B, 20 parts by mass of DuPont VAMAC VMX4017, 20 parts by mass of 4,4'-diaminodiphenyl sulfone, and 0.5 parts by mass of 2-methylimidazole were sequentially added and stirred uniformly to obtain a cold-resistant impact epoxy resin composition.

[0048] The glass fiber cloth impregnated with the cold-resistant impact epoxy resin composition was dried in an oven at 150°C for 3 min to obtain a cold-resistant impact epoxy resin prepreg with a thickness of 0.4 mm. 2 The glass fiber cloth impregnated with the cold-resistant impact epoxy resin composition was dried in an oven at 150°C for 3 min to obtain a cold-resistant impact epoxy resin prepreg with a thickness of 0.4 mm.

[0049] Four pieces of the cold-resistant impact epoxy resin prepreg were combined into a stack, one piece of PET release film was covered on each side of the stack, and the stack was fed into a fast press at 150°C, the pressure was increased to 200 psi, and after constant temperature and pressure for 15 min, the material was taken out, the PET release films on both sides were torn off after cooling to room temperature, and a cold-resistant impact epoxy resin laminate with a thickness of 1.6 mm was obtained.

[0050] Example 3

[0051] In a container, 80 parts by mass of methyl ethyl ketone, 100 parts by mass of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, 20 parts by mass of Japanese Sumitomo BF-7B, 20 parts by mass of DuPont VAMAC VMX4017, 20 parts by mass of 4,4'-diaminodiphenyl sulfone, and 0.5 parts by mass of 2-methylimidazole were sequentially added and stirred uniformly to obtain a cold-resistant impact epoxy resin composition.

[0052] The glass fiber cloth impregnated with the cold-resistant impact epoxy resin composition was dried in an oven at 150°C for 3 min to obtain a cold-resistant impact epoxy resin prepreg with a thickness of 0.4 mm. 2 The glass fiber cloth impregnated with the cold-resistant impact epoxy resin composition was dried in an oven at 150°C for 3 min to obtain a cold-resistant impact epoxy resin prepreg with a thickness of 0.4 mm.

[0053] Four pieces of the obtained cold-resistant and impact-resistant epoxy resin prepreg were combined into a laminate, one piece of PET release film was covered on each side of the laminate, and then the laminate was sent into a fast press at 150°C, the pressure was increased to 200 psi, and after constant temperature and pressure for 15 min, the material was taken out, the PET release film on each side was torn after cooling to room temperature, and a cold-resistant and impact-resistant epoxy resin laminate with a thickness of 1.6 mm was obtained.

[0054] Example 4

[0055] In a container, 80 parts of methyl ethyl ketone, 100 parts of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, 30 parts of Japanese Sumitomo BF-7B, 10 parts of DuPont VAMAC VMX4017, 20 parts of 4,4'-diamino diphenyl sulfone, and 0.5 parts of 2-methyl imidazole were added in sequence, and stirred uniformly to obtain a cold-resistant and impact-resistant epoxy resin composition.

[0056] 400 g / m 2 of glass fiber cloth was impregnated with the obtained cold-resistant and impact-resistant epoxy resin composition, dried in an oven at 150°C for 3 min, and a cold-resistant and impact-resistant epoxy resin prepreg with a thickness of 0.4 mm was obtained.

[0057] Four pieces of the obtained cold-resistant and impact-resistant epoxy resin prepreg were combined into a laminate, one piece of PET release film was covered on each side of the laminate, and then the laminate was sent into a fast press at 150°C, the pressure was increased to 200 psi, and after constant temperature and pressure for 15 min, the material was taken out, the PET release film on each side was torn after cooling to room temperature, and a cold-resistant and impact-resistant epoxy resin laminate with a thickness of 1.6 mm was obtained.

[0058] Example 5

[0059] In a container, 80 parts of methyl ethyl ketone, 100 parts of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, 30 parts of Japanese Sumitomo BF-7B, 30 parts of DuPont VAMAC VMX4017, 20 parts of 4,4'-diamino diphenyl sulfone, and 0.5 parts of 2-methyl imidazole were added in sequence, and stirred uniformly to obtain a cold-resistant and impact-resistant epoxy resin composition.

[0060] 400 g / m 2 of glass fiber cloth was impregnated with the obtained cold-resistant and impact-resistant epoxy resin composition, dried in an oven at 150°C for 3 min, and a cold-resistant and impact-resistant epoxy resin prepreg with a thickness of 0.4 mm was obtained.

[0061] Four pieces of the obtained cold-resistant and impact-resistant epoxy resin prepreg were combined into a laminate, one piece of PET release film was covered on each side of the laminate, and then the laminate was sent into a fast press at 150°C, the pressure was increased to 200 psi, and after constant temperature and pressure for 15 min, the material was taken out, the PET release film on each side was torn after cooling to room temperature, and a cold-resistant and impact-resistant epoxy resin laminate with a thickness of 1.6 mm was obtained.

[0062] Example 6

[0063] By weight, 80 parts of butanone, 100 parts of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, 30 parts of Arlanxen Levapren NPG VP, 20 parts of DuPont VAMAC VMX4017, 20 parts of 4,4'-diaminodiphenyl sulfone, and 0.5 parts of 2-methylimidazole were added sequentially to a container and stirred until homogeneous to obtain a cold-resistant and impact-resistant epoxy resin composition.

[0064] Impregnate 400g / m² of the obtained cold-resistant and impact-resistant epoxy resin composition. 2 The fiberglass cloth was dried in an oven at 150°C for 3 minutes to obtain a cold-resistant and impact-resistant epoxy resin prepreg with a thickness of 0.4 mm.

[0065] Four sheets of the obtained cold-resistant and impact-resistant epoxy resin prepreg were combined into a laminate. One PET release film was placed on each side of the laminate. The laminate was then fed into a high-pressure press at 150°C, and the pressure was increased to 200 psi. After maintaining the temperature and pressure for 15 minutes, the material was removed, cooled to room temperature, and the PET release films on both sides were peeled off to obtain a 1.6 mm thick cold-resistant and impact-resistant epoxy resin laminate.

[0066] Example 7

[0067] By weight, 80 parts of butanone, 100 parts of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, 30 parts of Sumitomo BF-7B, 20 parts of DuPont VAMAC DP, 20 parts of 4,4'-diaminodiphenyl sulfone, and 0.5 parts of 2-methylimidazole were added sequentially to a container and stirred until homogeneous to obtain a cold-resistant and impact-resistant epoxy resin composition.

[0068] Impregnate 400g / m² of the obtained cold-resistant and impact-resistant epoxy resin composition. 2 The fiberglass cloth was dried in an oven at 150°C for 3 minutes to obtain a cold-resistant and impact-resistant epoxy resin prepreg with a thickness of 0.4 mm.

[0069] Four sheets of the obtained cold-resistant and impact-resistant epoxy resin prepreg were combined into a laminate. One PET release film was placed on each side of the laminate. The laminate was then fed into a high-pressure press at 150°C, and the pressure was increased to 200 psi. After maintaining the temperature and pressure for 15 minutes, the material was removed, cooled to room temperature, and the PET release films on both sides were peeled off to obtain a 1.6 mm thick cold-resistant and impact-resistant epoxy resin laminate.

[0070] Example 8

[0071] By weight, 50 parts of acetone, 100 parts of bis((3,4-epoxycyclohexyl)methyl) adipate, 40 parts of Sumitomo BF-7M, 10 parts of DuPont VAMAC Ultra LT, 5 parts of p-aminodiphenylmethane, and 1 part of 2-ethyl-4-methylimidazole were added sequentially to a container and stirred until homogeneous to obtain a cold-resistant and impact-resistant epoxy resin composition.

[0072] Impregnate 400g / m² of the obtained cold-resistant and impact-resistant epoxy resin composition. 2 The fiberglass cloth was dried in an oven at 150°C for 3 minutes to obtain a cold-resistant and impact-resistant epoxy resin prepreg with a thickness of 0.4 mm.

[0073] Four sheets of the obtained cold-resistant and impact-resistant epoxy resin prepreg were combined into a laminate. One PET release film was placed on each side of the laminate. The laminate was then fed into a high-pressure press at 150°C, and the pressure was increased to 200 psi. After maintaining the temperature and pressure for 15 minutes, the material was removed, cooled to room temperature, and the PET release films on both sides were peeled off to obtain a 1.6 mm thick cold-resistant and impact-resistant epoxy resin laminate.

[0074] Example 9

[0075] By weight, 60 parts of N,N-dimethylformamide, 100 parts of the polymerization product of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate and caprolactone, 35 parts of Sumitomo BF-E, 15 parts of DuPont VAMACDP, 10 parts of dicyandiamide, and 0.8 parts of 2-methylimidazole were added sequentially to a container and stirred until homogeneous to obtain a cold-resistant and impact-resistant epoxy resin composition.

[0076] Impregnate 400g / m² of the obtained cold-resistant and impact-resistant epoxy resin composition. 2 The fiberglass cloth was dried in an oven at 150°C for 3 minutes to obtain a cold-resistant and impact-resistant epoxy resin prepreg with a thickness of 0.4 mm.

[0077] Four sheets of the obtained cold-resistant and impact-resistant epoxy resin prepreg were combined into a laminate. One PET release film was placed on each side of the laminate. The laminate was then fed into a high-pressure press at 150°C, and the pressure was increased to 200 psi. After maintaining the temperature and pressure for 15 minutes, the material was removed, cooled to room temperature, and the PET release films on both sides were peeled off to obtain a 1.6 mm thick cold-resistant and impact-resistant epoxy resin laminate.

[0078] Example 10

[0079] By weight, 70 parts of cyclohexanone, 100 parts of 4,5-epoxycyclohexane-1,2-dicarboxylic acid diglycidyl ester, 32 parts of Arlanxen Levapren NPG VP, 18 parts of DuPont VAMAC Ultra LT, 15 parts of p-aminodiphenylmethane, and 0.7 parts of 2-ethyl-4-methylimidazole were added sequentially to a container and stirred until homogeneous to obtain a cold-resistant and impact-resistant epoxy resin composition.

[0080] Impregnate 400g / m² of the obtained cold-resistant and impact-resistant epoxy resin composition. 2 The fiberglass cloth was dried in an oven at 150°C for 3 minutes to obtain a cold-resistant and impact-resistant epoxy resin prepreg with a thickness of 0.4 mm.

[0081] Four sheets of the obtained cold-resistant and impact-resistant epoxy resin prepreg were combined into a laminate. One PET release film was placed on each side of the laminate. The laminate was then fed into a high-pressure press at 150°C, and the pressure was increased to 200 psi. After maintaining the temperature and pressure for 15 minutes, the material was removed, cooled to room temperature, and the PET release films on both sides were peeled off to obtain a 1.6 mm thick cold-resistant and impact-resistant epoxy resin laminate.

[0082] Example 11

[0083] By weight, 75 parts of propylene glycol methyl ether, 100 parts of 4-vinyl-1-cyclohexene diepoxide, 30 parts of Sumitomo BF-E, 20 parts of DuPont VAMAC DP, 20 parts of dicyandiamide, and 0.6 parts of 2-methylimidazole were added sequentially to a container and stirred until homogeneous to obtain a cold-resistant and impact-resistant epoxy resin composition.

[0084] Impregnate 400g / m² of the obtained cold-resistant and impact-resistant epoxy resin composition. 2 The fiberglass cloth was dried in an oven at 150°C for 3 minutes to obtain a cold-resistant and impact-resistant epoxy resin prepreg with a thickness of 0.4 mm.

[0085] Four sheets of the obtained cold-resistant and impact-resistant epoxy resin prepreg were combined into a laminate. One PET release film was placed on each side of the laminate. The laminate was then fed into a high-pressure press at 150°C, and the pressure was increased to 200 psi. After maintaining the temperature and pressure for 15 minutes, the material was removed, cooled to room temperature, and the PET release films on both sides were peeled off to obtain a 1.6 mm thick cold-resistant and impact-resistant epoxy resin laminate.

[0086] Example 12

[0087] By weight, 85 parts of ethylene glycol methyl ether, 100 parts of diglycidyl hexahydrophthalate, 28 parts of Sumitomo BF-7M, 22 parts of DuPont VAMAC Ultra LT, 25 parts of p-aminodiphenylmethane, and 0.4 parts of 2-ethyl-4-methylimidazole were added sequentially to a container and stirred until homogeneous to obtain a cold-resistant and impact-resistant epoxy resin composition.

[0088] The obtained cold-resistant impact epoxy resin composition was used to impregnate 400 g / m 2 of glass fiber cloth, which was dried in an oven at 150 °C for 3 min to obtain a cold-resistant impact epoxy resin prepreg with a thickness of 0.4 mm.

[0089] Four pieces of the obtained cold-resistant impact epoxy resin prepreg were combined into a stack, and one piece of PET release film was covered on each side of the stack. The stack was sent into a fast press at 150 °C, and the pressure was increased to 200 psi. After constant temperature and pressure for 15 min, the material was taken out, and the PET release films on both sides were torn off after cooling to room temperature to obtain a cold-resistant impact epoxy resin laminate with a thickness of 1.6 mm.

[0090] Example 13

[0091] In a container, 90 parts of toluene, 100 parts of 1,4-cyclohexanedimethanol bis(3,4- epoxycyclohexanecarboxylate), 25 parts of Japanese Sumitomo BF-E, 25 parts of DuPont VAMAC DP, 25 parts of dicyandiamide, and 0.3 parts of 2-methylimidazole were added in sequence, and stirred uniformly to obtain a cold-resistant impact epoxy resin composition.

[0092] The obtained cold-resistant impact epoxy resin composition was used to impregnate 400 g / m 2 of glass fiber cloth, which was dried in an oven at 150 °C for 3 min to obtain a cold-resistant impact epoxy resin prepreg with a thickness of 0.4 mm.

[0093] Four pieces of the obtained cold-resistant impact epoxy resin prepreg were combined into a stack, and one piece of PET release film was covered on each side of the stack. The stack was sent into a fast press at 150 °C, and the pressure was increased to 200 psi. After constant temperature and pressure for 15 min, the material was taken out, and the PET release films on both sides were torn off after cooling to room temperature to obtain a cold-resistant impact epoxy resin laminate with a thickness of 1.6 mm.

[0094] Comparative Example 1

[0095] In a container, 80 parts of methyl ethyl ketone, 100 parts of 3,4-epoxycyclohexylmethyl-3,4- epoxycyclohexylcarboxylate, 20 parts of DuPont VAMAC VMX4017, 20 parts of 4,4'-diaminodiphenyl sulfone, and 0.5 parts of 2-methylimidazole were added in sequence, and stirred uniformly to obtain an epoxy resin composition.

[0096] The obtained epoxy resin composition was used to impregnate 400 g / m 2 of glass fiber cloth, which was dried in an oven at 150 °C for 3 min to obtain an epoxy resin prepreg with a thickness of 0.4 mm.

[0097] Four pieces of the obtained epoxy resin prepreg were combined into a stack, one piece of PET release film was covered on each side of the stack, and the stack was fed into a fast press at 150°C. The pressure was increased to 200 psi, and after constant temperature and pressure for 15 min, the material was taken out. After cooling to room temperature, the PET release films on both sides were torn off, and an epoxy resin laminate with a thickness of 1.6 mm was obtained.

[0098] Comparative Example 2

[0099] In a container, 80 parts of methyl ethyl ketone, 100 parts of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, 50 parts of Japanese Sumitomo BF-7B, 20 parts of DuPont VAMAC VMX4017, 20 parts of 4,4'-diaminodiphenyl sulfone, and 0.5 parts of 2-methylimidazole were added in sequence, and stirred uniformly to obtain an epoxy resin composition.

[0100] 400 g / m2of glass fiber cloth was impregnated with the obtained epoxy resin composition, dried in an oven at 150°C for 3 min, and an epoxy resin prepreg with a thickness of 0.4 mm was obtained. 2

[0101] Four pieces of the obtained epoxy resin prepreg were combined into a stack, one piece of PET release film was covered on each side of the stack, and the stack was fed into a fast press at 150°C. The pressure was increased to 200 psi, and after constant temperature and pressure for 15 min, the material was taken out. After cooling to room temperature, the PET release films on both sides were torn off, and an epoxy resin laminate with a thickness of 1.6 mm was obtained.

[0102] Comparative Example 3

[0103] In a container, 80 parts of methyl ethyl ketone, 100 parts of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, 30 parts of Japanese Sumitomo BF-7B, 20 parts of 4,4'-diaminodiphenyl sulfone, and 0.5 parts of 2-methylimidazole were added in sequence, and stirred uniformly to obtain an epoxy resin composition.

[0104] 400 g / m2of glass fiber cloth was impregnated with the obtained epoxy resin composition, dried in an oven at 150°C for 3 min, and an epoxy resin prepreg with a thickness of 0.4 mm was obtained. 2

[0105] Four pieces of the obtained epoxy resin prepreg were combined into a stack, one piece of PET release film was covered on each side of the stack, and the stack was fed into a fast press at 150°C. The pressure was increased to 200 psi, and after constant temperature and pressure for 15 min, the material was taken out. After cooling to room temperature, the PET release films on both sides were torn off, and an epoxy resin laminate with a thickness of 1.6 mm was obtained.

[0106] Comparative Example 4

[0107] ​​By weight, 80 parts of butanone, 100 parts of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, 30 parts of Sumitomo BF-7B, 40 parts of DuPont VAMAC VMX4017, 20 parts of 4,4'-diaminodiphenyl sulfone, and 0.5 parts of 2-methylimidazole were added sequentially to a container and stirred until homogeneous to obtain an epoxy resin composition.

[0108] Impregnate 400 g / m with the obtained epoxy resin composition. 2 The fiberglass cloth was dried in an oven at 150°C for 3 minutes to obtain an epoxy resin prepreg with a thickness of 0.4 mm.

[0109] Four epoxy resin prepregs were combined into a laminate. One PET release film was placed on each side of the laminate. The laminate was then fed into a high-pressure press at 150°C. The pressure was increased to 200 psi and kept at constant temperature and pressure for 15 minutes. The material was then removed, cooled to room temperature, and the PET release films on both sides were peeled off to obtain an epoxy resin laminate with a thickness of 1.6 mm.

[0110] Comparative Example 5

[0111] By weight, 80 parts of butanone, 100 parts of bisphenol A epoxy resin, 30 parts of Sumitomo BF-7B, 20 parts of DuPont VAMAC VMX4017, 20 parts of 4,4'-diaminodiphenyl sulfone, and 0.5 parts of 2-methylimidazole were added sequentially to a container and stirred until homogeneous to obtain an epoxy resin composition.

[0112] Impregnate 400 g / m with the obtained epoxy resin composition. 2 The fiberglass cloth was dried in an oven at 150°C for 3 minutes to obtain an epoxy resin prepreg with a thickness of 0.4 mm.

[0113] Four epoxy resin prepregs were combined into a laminate. One PET release film was placed on each side of the laminate. The laminate was then fed into a high-pressure press at 150°C. The pressure was increased to 200 psi and kept at constant temperature and pressure for 15 minutes. The material was then removed, cooled to room temperature, and the PET release films on both sides were peeled off to obtain an epoxy resin laminate with a thickness of 1.6 mm.

[0114] Comparative Example 6

[0115] By weight, 80 parts of butanone, 100 parts of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, 50 parts of PDMS silicone rubber, 20 parts of 4,4'-diaminodiphenyl sulfone, and 0.5 parts of 2-methylimidazole are added sequentially to a container and stirred until homogeneous to obtain an epoxy resin composition.

[0116] Impregnate 400 g / m with the obtained epoxy resin composition. 2The glass fiber cloth was impregnated with 400 g / m2of the epoxy resin composition obtained in Example 1, dried in an oven at 150°C for 3 min to obtain an epoxy resin prepreg with a thickness of 0.4 mm.

[0117] Four pieces of the epoxy resin prepreg obtained were combined into a stack, one piece of PET release film was covered on each side of the stack, and the stack was fed into a fast press at 150°C, the pressure was increased to 200 psi, and after constant temperature and pressure for 15 min, the material was taken out, and after cooling to room temperature, the PET release films on both sides were torn off to obtain an epoxy resin laminate with a thickness of 1.6 mm.

[0118] Comparative Example 7

[0119] In a container, 80 parts by mass of methyl ethyl ketone, 100 parts by mass of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, 50 parts by mass of hydrogenated butadiene rubber, 20 parts by mass of 4,4'-diaminodiphenyl sulfone, and 0.5 parts by mass of 2-methylimidazole were sequentially added and stirred uniformly to obtain an epoxy resin composition.

[0120] The glass fiber cloth was impregnated with 400 g / m2of the epoxy resin composition obtained in Example 1, dried in an oven at 150°C for 3 min to obtain an epoxy resin prepreg with a thickness of 0.4 mm. 2 The glass fiber cloth was impregnated with 400 g / m2of the epoxy resin composition obtained in Example 1, dried in an oven at 150°C for 3 min to obtain an epoxy resin prepreg with a thickness of 0.4 mm.

[0121] Four pieces of the epoxy resin prepreg obtained were combined into a stack, one piece of PET release film was covered on each side of the stack, and the stack was fed into a fast press at 150°C, the pressure was increased to 200 psi, and after constant temperature and pressure for 15 min, the material was taken out, and after cooling to room temperature, the PET release films on both sides were torn off to obtain an epoxy resin laminate with a thickness of 1.6 mm.

[0122] Table 1 Composition and amount of cold-resistant impact-resistant epoxy resin composition in Examples 1-7

[0123]

[0124] Table 2 Composition and amount of cold-resistant impact-resistant epoxy resin composition in Examples 8-

[0125]

[0126]

[0127] Table 3 Composition and amount of epoxy resin composition in Comparative Examples 1-7

[0128]

[0129] The laminates obtained in each of the above examples and comparative examples were respectively subjected to performance tests. The test items included: simple beam impact strength test at 23°C, simple beam impact strength test at -30°C, flexural strength test before aging, and flexural strength test after aging, and the test results are shown in Table 4.

[0130] 1. The Charpy impact strength test at 23℃: The test was carried out according to the standard GB / T 1043.2-2018, and the sample temperature was controlled at 23℃ during the test.

[0131] 2. The Charpy impact strength test at -30℃: The test was carried out according to the standard GB / T 1043.2-2018, and the sample temperature was controlled at -30℃ during the test.

[0132] 3. The aging test: The test was carried out according to the standard ISO 4892.

[0133] 4. The bending strength test: The test was carried out according to the standard GB / T 9341-2008.

[0134] Table 4. Test results of Examples 1-14 and Comparative Examples 1-7.

[0135]

[0136] As shown in Table 4, the cold-resistant impact epoxy resin laminate prepared by the present scheme has better comprehensive performance. Specifically, the cold-resistant impact epoxy resin laminate with a thickness of 1.6mm has a Charpy impact strength of ≥250kJ / m 2 at 23℃, a Charpy impact strength of ≥217kJ / m 2 at -30℃, a bending strength of ≥527MPa before aging, a bending strength of ≥496MPa after aging, and a bending strength decrease rate of ≤7.62% after aging.

[0137] Compared with Example 1, the composition used for preparing the epoxy resin laminate of Comparative Example 1 does not add E-GMA copolymer, the low-temperature brittleness increases, resulting in a significant decrease in impact strength at -30℃, and bending strength after aging. The composition used for preparing the epoxy resin laminate of Comparative Example 2 adds E-GMA copolymer exceeding the upper limit, the rigidity decreases, resulting in a bending strength less than 500 MPa. The composition used for preparing the epoxy resin laminate of Comparative Example 3 does not add AEM rubber, the toughness and weather resistance decrease, resulting in a significant decrease in impact strength at 23℃ and -30℃, and bending strength after aging. The composition used for preparing the epoxy resin laminate of Comparative Example 4 adds AEM rubber exceeding the upper limit, the rigidity decreases, resulting in a bending strength less than 500 MPa. The composition used for preparing the epoxy resin laminate of Comparative Example 5 replaces the weather-resistant epoxy resin with bisphenol A type epoxy resin in equal amount, resulting in a significant decrease in anti-aging performance. The composition used for preparing the epoxy resin laminate of Comparative Example 6 replaces the combination of E-GMA copolymer and AEM rubber with PDMS silicone rubber which has better weather resistance and low-temperature resistance, but due to the low adhesion strength of silicone rubber and epoxy resin, the mechanical strength of the resin composition is greatly lost, and a laminate with the same impact strength and bending strength cannot be obtained. The composition used for preparing the epoxy resin laminate of Comparative Example 7 replaces the combination of E-GMA copolymer and AEM rubber with hydrogenated nitrile rubber which has better toughening effect, although the hydrogenated nitrile rubber has better weather resistance than nitrile rubber, but still cannot achieve the same performance as AEM rubber, so the bending strength after aging still decreases significantly.

[0138] In summary, the present scheme uses AEM rubber and E-GMA copolymer which have low brittleness temperature and excellent impact strength, and is compounded with weather-resistant epoxy resin to prepare a weather-resistant epoxy resin composition which still has high impact strength at low temperature, thereby improving the reliability of the products prepared from the composition under severe cold conditions.

[0139] Obviously, the above examples of the present scheme are only examples for clearly illustrating the present scheme, and are not intended to limit the implementation modes of the present scheme. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present scheme shall be included in the protection scope of the claims of the present scheme.

Claims

1. A cold-resistant impact-resistant epoxy resin composition, characterized by comprising: The composition comprises the following components in mass parts: a weather-resistant epoxy resin 100 parts, an ethylene-glycidyl methacrylate copolymer 20-40 parts, an ethylene-acrylate rubber 10-30 parts, a curing agent 5-30 parts, an accelerator 0.1-1 part, and a solvent 50-100 parts. The weather-resistant epoxy resin is selected from at least one of an alicyclic epoxy resin and an aliphatic epoxy resin. 2.The cold-resistant and impact-resistant epoxy resin composition according to claim 1, wherein the weather-resistant epoxy resin is selected from at least one of bis((3,4-epoxycyclohexyl)methyl)hexanedioate, a polymerization product of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate and caprolactone, 4,5-epoxycyclohexane-1,2-dicarboxylic acid diglycidyl ester, 4-vinyl-1-cyclohexene diepoxide, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, hexahydrophthalic acid diglycidyl ester, and 1,4-cyclohexane dimethanol bis(3,4-epoxycyclohexanecarboxylate). 3.The cold-resistant and impact-resistant epoxy resin composition according to claim 1, wherein the ethylene-glycidyl methacrylate copolymer is selected from at least one of an ethylene-glycidyl methacrylate binary copolymer, an ethylene-glycidyl methacrylate-vinyl acetate ternary copolymer, and an ethylene-glycidyl methacrylate-methyl acrylate ternary copolymer. 4.The cold-resistant and impact-resistant epoxy resin composition according to claim 1, wherein the ethylene-acrylate rubber is selected from at least one of an ethylene-methyl acrylate binary copolymer, an ethylene-ethyl acrylate binary copolymer, an ethylene-butyl acrylate binary copolymer, an ethylene-methoxyethyl acrylate binary copolymer, an ethylene-methyl methacrylate binary copolymer, an ethylene-ethyl methacrylate binary copolymer, an ethylene-butyl methacrylate binary copolymer, and an ethylene-methoxyethyl methacrylate binary copolymer. 5.The cold-resistant and impact-resistant epoxy resin composition according to any one of claims 1 to 4, wherein the curing agent is selected from at least one of a fatty polyamine type curing agent, an aromatic amine type curing agent, a polyamide type curing agent, and a hydrazide type curing agent. 6.The cold-resistant and impact-resistant epoxy resin composition according to claim 5, wherein the curing agent is selected from a fatty polyamine type curing agent or an aromatic amine type curing agent having two or more amine groups in a molecular structure. 7.The cold-resistant and impact-resistant epoxy resin composition according to claim 1, wherein the accelerator is selected from at least one of 2-methylimidazole and 2-ethyl-4-methylimidazole. 8.The cold-resistant and impact-resistant epoxy resin composition according to any one of claims 1 to 4, wherein the solvent is selected from at least one of acetone, butanone, N,N-dimethylformamide, cyclohexanone, propylene glycol methyl ether, ethylene glycol methyl ether, and toluene. 9.A cold-resistant and impact-resistant epoxy resin prepreg, comprising the composition according to any one of claims 1 to 8. ​ ​ ​ ​ ​ ​ ​ Said prepreg comprises a reinforcement and a resin matrix adhered to said reinforcement, said resin matrix being made of the cold-resistant impact-resistant epoxy resin composition according to any one of claims 1 to 8.

10. A cold-resistant impact-resistant epoxy resin laminate, characterized in that, Said laminate comprises at least one cold-resistant impact-resistant epoxy resin prepreg according to claim 9.

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