A liquid nitrile rubber toughened epoxy resin composition with high storage stability, and a preparation method and applications thereof

Abstract

The application provides a high storage stability functionalized liquid nitrile rubber toughened epoxy resin composition, a preparation method and application, and the method comprises the following components in parts by mass: 90-105 parts of an epoxy resin, 5-15 parts of a liquid nitrile rubber, 3-6 parts of a stabilizer, 22-35 parts of a curing agent, 0.1-0.3 parts of an antifoaming agent and 0.2-0.6 parts of an adjusting agent; wherein the liquid nitrile rubber comprises at least one of carboxyl-terminated liquid nitrile rubber, hydroxyl-terminated liquid nitrile rubber and epoxy-terminated liquid nitrile rubber; the stabilizer comprises diethylene glycol monobutyl ether and / or triethylene glycol monobutyl ether; the curing agent comprises a fatty amine and a polyether amine, the fatty amine comprises a curing agent T31 and / or a curing agent 650, and the polyether amine comprises D230 linear polyether amine and / or D400 linear polyether amine. The scheme can improve the compatibility, form a uniform and stable nanoscale microphase separation structure, ensure the toughening effect and improve the storage stability.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a highly storage-stable functionalized liquid nitrile rubber toughened epoxy resin composition, its preparation method, and its application. Background Technology

[0002] Epoxy resin toughening systems are widely used in anti-corrosion coatings, electronic potting, composite materials and structural bonding. Existing technologies mostly use physical blending or chemical modification of liquid nitrile rubber to improve toughness.

[0003] However, in physically blended systems, epoxy resin and liquid nitrile rubber have limited compatibility, and sedimentation, stratification, or precipitation are likely to occur during storage. After curing, local agglomeration is formed, resulting in fluctuating toughening effect and insufficient strength retention. Although chemical modification can improve compatibility, the process conditions are harsh and the cost is high, making it difficult to ensure long-term storage stability in practical applications.

[0004] Therefore, how to improve compatibility and storage stability in epoxy resin toughening systems, while balancing toughness enhancement and mechanical properties, has become a technical problem that needs to be solved. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an amino-terminated liquid nitrile rubber. This epoxy resin composition is constructed around the synergistic matching relationship between the components in the epoxy resin toughening system. While improving the compatibility between the liquid nitrile rubber and the epoxy resin system, it also takes into account the stability of the system during storage and the balance of toughness and mechanical properties after curing, thereby meeting the requirements of relevant application scenarios for preparation efficiency, usage stability and comprehensive performance.

[0006] The present invention also provides a method for preparing an epoxy resin composition, which can prepare the above-mentioned epoxy resin composition. The preparation method is simple, green, has no by-products, and has low production cost.

[0007] This invention also provides an application of an epoxy resin composition in electronic device potting, industrial structural bonding, industrial anti-corrosion coating preparation, or composite material matrix preparation. By precisely specifying the proportions of specific types of liquid nitrile rubber, ether stabilizers, composite modified amine curing agents, and additives, it solves the problems of poor compatibility between existing epoxy toughening systems and nitrile rubber, easy stratification and sedimentation during storage, and poor toughening stability. The composition achieves uniform compatibility and excellent storage stability, making it suitable for industrial use in electronic device potting, industrial structural bonding, industrial anti-corrosion coating preparation, or composite material matrix preparation.

[0008] In a first aspect, the present invention provides an epoxy resin composition comprising the following components in parts by weight:

[0009] 90-105 parts epoxy resin, 5-15 parts liquid nitrile rubber, 3-6 parts stabilizer, 22-35 parts curing agent, 0.1-0.3 parts defoamer, and 0.2-0.6 parts regulator;

[0010] The liquid nitrile rubber includes at least one of carboxyl-terminated liquid nitrile rubber, hydroxyl-terminated liquid nitrile rubber, and epoxy-terminated liquid nitrile rubber.

[0011] The stabilizer includes diethylene glycol monobutyl ether and / or triethylene glycol monobutyl ether;

[0012] The curing agent includes aliphatic amines and polyether amines, wherein the aliphatic amines include curing agent T31 and / or curing agent 650, and the polyether amines include D230 linear polyether amine and / or D400 linear polyether amine.

[0013] Furthermore, the number-average molecular weight of the polyetheramine is 240 Da to 400 Da.

[0014] Furthermore, the mass ratio of the fatty amine to the polyether amine is 1:(0.9~1.3).

[0015] Furthermore, the number-average molecular weight of the epoxy resin is 380 Da to 440 Da.

[0016] Furthermore, the liquid nitrile rubber has a number-average molecular weight of 3000 Da to 5000 Da, an acid value of 0.45 mmol / g to 0.85 mmol / g, and an acrylonitrile mass fraction of 24% to 30%.

[0017] Furthermore, the epoxy resin includes bisphenol A type epoxy resin E-51 and / or bisphenol A type epoxy resin E-44;

[0018] And / or, the defoamer includes silicone defoamers;

[0019] And / or, the modifier includes fumed silica.

[0020] Furthermore, the silicone defoamer includes BYK-024 and / or BYK-A530.

[0021] In a second aspect, the present invention provides a method for preparing the epoxy resin composition described in the first aspect, comprising the following steps:

[0022] 1) The epoxy resin and stabilizer are stirred once to obtain a first intermediate product;

[0023] 2) The first intermediate product and the liquid nitrile rubber are stirred a second time to obtain the second intermediate product;

[0024] 3) The second intermediate product, the regulator, and the defoamer are stirred three times to obtain the third intermediate product;

[0025] 4) The third intermediate product and the curing agent are stirred four times to obtain the epoxy resin composition.

[0026] Furthermore, the temperature of the first stirring is 30℃~40℃, and the stirring time is 15min~20min;

[0027] And / or, the temperature of the secondary stirring is 35℃~45℃, and the time of the secondary stirring is 20min~25min;

[0028] And / or, the temperature of the three stirrings is 25℃~35℃, and the time of the three stirrings is 10min~15min;

[0029] And / or, the temperature of the four stirrings is 20℃~25℃, and the time of the four stirrings is 8min~12min;

[0030] And / or, after the four stirrings, a degassing treatment is further included; wherein the pressure of the degassing treatment is 0.02 Pa to 0.09 Pa, and the time of the degassing treatment is 5 min to 10 min.

[0031] Thirdly, the present invention provides an application of the epoxy resin composition described in the first aspect in the potting of electronic devices, industrial structural bonding, preparation of industrial anti-corrosion coatings, or preparation of composite matrix.

[0032] The epoxy resin composition provided by this invention, by synergistically configuring specific types and proportions of liquid nitrile rubber, stabilizer, curing agent, defoamer and regulator in the epoxy resin composition, can improve the dispersion and compatibility of liquid nitrile rubber in the epoxy resin system, inhibit sedimentation, stratification or precipitation during storage, and promote the coordinated stability of the performance of the cured system, thereby improving the toughness of the system while taking into account the retention of mechanical strength and long-term reliability. Detailed Implementation

[0033] To enable those skilled in the art to better understand the solutions of the present invention, the present invention will be further described in detail below, and the technical solutions in the embodiments of the present invention will be clearly and completely described. The specific embodiments listed below are only for describing the principles and features of the present invention, and the examples given are only for explaining the present invention and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Epoxy resin toughening compositions belong to the fields of polymer materials and fine chemicals, and are mainly used in industrial anti-corrosion coatings, electronic device potting, fiber-reinforced composite matrix, and industrial structural bonding. These materials typically require homogeneous components during formulation, storage, transportation, and application or potting, and must possess high toughness, strength, and environmental adaptability after curing. Existing epoxy resin toughening systems mainly improve impact and crack resistance by introducing liquid nitrile rubber into epoxy resin. The technical routes usually include direct physical blending, or functionalizing, grafting, or end-capping the liquid nitrile rubber before combining it with epoxy resin, and then using a curing agent to complete the molding and curing process.

[0035] While physical blending is relatively simple, the significant polarity difference between epoxy resin and liquid nitrile rubber makes the system prone to sedimentation, stratification, or precipitation during storage. Localized agglomeration may also occur before use, leading to poor application consistency. Uneven rubber phase dispersion during curing can cause localized stress concentrations, resulting in unstable toughness enhancement and insufficient strength retention. Chemical modification can improve compatibility to some extent, but it typically requires additional modification steps and more complex reaction conditions, increasing preparation costs and process burden, making it difficult to balance mass production, storage stability, and field application efficiency. Therefore, these shortcomings directly affect coating protection life, potting reliability, composite material interface stability, and long-term service performance of structural bonding. In view of this, how to simultaneously improve compatibility, storage stability, and toughness enhancement in epoxy resin toughening systems, while maintaining a balance in mechanical properties, has become an urgent technical problem to be solved.

[0036] To address the above problems, the present invention provides the following technical solution:

[0037] In a first aspect, the present invention provides an epoxy resin composition comprising the following components in parts by weight:

[0038] 90-105 parts epoxy resin, 5-15 parts liquid nitrile rubber, 3-6 parts stabilizer, 22-35 parts curing agent, 0.1-0.3 parts defoamer, and 0.2-0.6 parts regulator;

[0039] Among them, liquid nitrile rubber includes at least one of carboxyl-terminated liquid nitrile rubber, hydroxyl-terminated liquid nitrile rubber, and epoxy-terminated liquid nitrile rubber;

[0040] Stabilizers include diethylene glycol monobutyl ether and / or triethylene glycol monobutyl ether;

[0041] The curing agents include aliphatic amines and polyether amines. The aliphatic amines include curing agent T31 and / or curing agent 650, and the polyether amines include D230 linear polyether amine and / or D400 linear polyether amine.

[0042] For example, 90 parts, 91 parts, 92 parts, 93 parts, 94 parts, 95 parts, 96 parts, 97 parts, 98 parts, 99 parts, 100 parts, 101 parts, 102 parts, 103 parts, 104 parts, and 105 parts of epoxy resin; 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, and 15 parts of liquid nitrile rubber; 3 parts, 4 parts, 5 parts, and 6 parts of stabilizer; and 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, and 32 parts of curing agent. The following amounts are permitted: 33 parts, 34 parts, 35 parts; 0.1 parts, 0.11 parts, 0.12 parts, 0.13 parts, 0.14 parts, 0.15 parts, 0.16 parts, 0.17 parts, 0.18 parts, 0.19 parts, 0.2 parts, 0.21 parts, 0.22 parts, 0.23 parts, 0.24 parts, 0.25 parts, 0.26 parts, 0.27 parts, 0.28 parts, 0.29 parts, 0.3 parts; and 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, or any combination of two.

[0043] In this invention, by synergistically limiting the component range and compatibility of the epoxy resin matrix, liquid nitrile rubber, stabilizer, curing agent, defoamer, and regulator, the compatibility of the epoxy resin and liquid nitrile rubber two-phase interface is improved, avoiding stratification, precipitation, and sedimentation during the storage stage of the rubber compound, and extending the storage period of the epoxy resin composition; the components of the epoxy resin composition maintain a uniform dispersion during storage and transportation, thereby ensuring its performance stability during construction; after the epoxy resin composition is cured, a uniform nanoscale microphase separation structure can be formed, thereby achieving simultaneous consideration of two-phase compatibility, long-term storage stability, and stable toughening effect, while maintaining the strength and comprehensive mechanical properties of the cured product.

[0044] The overall mechanism of action is as follows: the epoxy resin constructs a continuous rigid cross-linked framework, while the liquid nitrile rubber acts as a stress-absorbing and toughening phase; the stabilizer can form molecular interactions with the epoxy resin and liquid nitrile rubber segments respectively, filling the polar gaps between the two phases, weakening interfacial repulsion, regulating the interfacial compatibility of the two phases, and inhibiting the precipitation and sedimentation of the rubber phase from the root; the curing agent can slow down the epoxy-amine curing reaction rate and avoid local agglomeration of the rubber phase caused by rapid curing; the regulator controls the rheological properties of the system, and can sustainably maintain the uniform dispersion of the rubber phase during storage, transportation, and construction; the defoamer eliminates air bubbles introduced by stirring, which can reduce internal defects in the cured product. The room temperature storage period of this epoxy resin composition is extended to more than 30 days, with no precipitation, and it can be reused for a long time, improving production efficiency and reducing raw material waste.

[0045] By coupling and synergistically combining interfacial tension regulation, controllable slow curing, and rheological stabilization, liquid nitrile rubber is uniformly dispersed and embedded in the epoxy crosslinking network after curing. Under external force, it can disperse the stress at the crack tip and deflect and blunt the crack propagation path, significantly improving the material's impact resistance and crack resistance without sacrificing the matrix strength, thus ensuring the long-term stability of the product.

[0046] It should be noted that in this invention, the epoxy resin and the curing agent undergo a cross-linking reaction; the stabilizer, liquid nitrile rubber, regulator, and defoamer do not participate in this cross-linking reaction, but only improve the overall performance of the system through physical effects such as interfacial compatibility, rheological regulation, toughening, and defoaming. While improving the compatibility and stability of the system, it can retain the advantages of high strength, high adhesion, and corrosion resistance of the epoxy matrix, achieving a synergistic balance between toughness and strength.

[0047] In some embodiments, the number-average molecular weight of the polyetheramine is 240 Da to 400 Da.

[0048] By limiting the number-average molecular weight of polyetheramine within this range, polyetheramine can possess both sufficient molecular chain flexibility and suitable amine reactivity, improving its compatibility with carboxyl-terminated liquid nitrile rubber, hydroxyl-terminated liquid nitrile rubber, or epoxy-terminated liquid nitrile rubber in the system. This results in a more uniform dispersion of the rubber phase before and after curing, reducing the tendency of liquid nitrile rubber to agglomerate and settle. After curing, the microphase particles are uniformly distributed, without voids or stress concentration points, significantly improving impact toughness and crack resistance. This balances improved toughness, strength retention, and processing adaptability. Furthermore, the synergistic effect of polyetheramine and aliphatic amine further reduces local stress concentration, thereby ensuring the long-term reliability of epoxy resin compositions in applications such as anti-corrosion coatings, potting, and structural bonding.

[0049] For example, the number average molecular weight of the polyetheramine is any value or a range of any combination of 240Da, 260Da, 280Da, 300Da, 320Da, 340Da, 360Da, 380Da, 400Da, etc.

[0050] In some embodiments, the mass ratio of fatty amine to polyether amine is 1:(0.9~1.3).

[0051] By controlling the mass ratio of aliphatic amine to polyether amine to be 1:(0.9~1.3), a match can be formed between the two in terms of reactivity and molecular chain flexibility, achieving a balance between curing rate, exothermic process and microphase structure formation: aliphatic amine undergoes ring-opening addition reaction with epoxy groups to form the main network, while polyether amine simultaneously participates in crosslinking and introduces flexible segments; thereby improving the toughness, compatibility and system stability of the cured product after storage, and reducing the sedimentation, delamination and "toughening and strength reduction" phenomena commonly found in toughening systems, so that the composition can maintain good strength, toughness and service reliability in applications such as anti-corrosion coating, potting and structural bonding.

[0052] For example, the mass ratio of fatty amine to polyether amine is any value of 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, or any range of both.

[0053] In some embodiments, the number average molecular weight of the epoxy resin is 380 Da to 440 Da.

[0054] By limiting the number-average molecular weight of the epoxy resin to 380 Da~440 Da, the system can balance flowability, reactivity and crosslinking strength, making the toughening components easier to disperse stably and forming a network structure with both toughness and strength after curing. This ensures that the composition has better process adaptability, mechanical balance and long-term service reliability in applications such as anti-corrosion coatings, potting and bonding.

[0055] For example, the number average molecular weight of the epoxy resin is any value of 380Da, 400Da, 420Da, 440Da, or a range of any combination of both.

[0056] In some embodiments, the liquid nitrile rubber has a number average molecular weight of 3000 Da to 5000 Da, an acid value of 0.45 mmol / g to 0.85 mmol / g, and an acrylonitrile mass fraction of 24% to 30%.

[0057] The appropriate number-average molecular weight, acid value, and acrylonitrile content collectively regulate the chain segment mobility, polarity, and interfacial affinity of liquid nitrile rubber, enabling it to form a uniform microphase dispersion before curing and a fine, stable rubber toughening structure after curing. Through the synergistic control of these parameters, the storage stability, application uniformity, and post-curing toughness of the composition can be effectively improved, resulting in better performance in terms of impact resistance, crack resistance, and mechanical property retention.

[0058] For example, the liquid nitrile rubber has a number average molecular weight of 3000Da, 3200Da, 3400Da, 3600Da, 3800Da, 4000Da, 4200Da, 4400Da, 4600Da, 4800Da, or 5000Da, an acid value of 0.45mmol / g, 0.5mmol / g, 0.55mmol / g, 0.6mmol / g, 0.65mmol / g, 0.7mmol / g, 0.75mmol / g, 0.8mmol / g, or 0.85mmol / g, and an acrylonitrile mass fraction of any value or a range of any combination of two of the following: 24%, 25%, 26%, 27%, 28%, 29%, or 30%.

[0059] In some embodiments, the epoxy resin includes bisphenol A type epoxy resin E-51 and / or bisphenol A type epoxy resin E-44.

[0060] It should be noted that by using the present invention alone or in combination, the base resin can be matched according to the construction viscosity, potting requirements and curing strength, so that the epoxy phase, liquid nitrile rubber, stabilizer and curing agent can more easily form a homogeneous system.

[0061] Among them, E-51 usually has moderate viscosity and good reactivity, which is suitable for improving the flow and mixing uniformity of the system; E-44 can increase the epoxy equivalent density of the system to a certain extent, which is convenient for subsequent cross-linking into a network.

[0062] In some implementations, the defoamer includes a silicone defoamer.

[0063] Among them, the above-mentioned defoamer can quickly spread at the gas-liquid interface in a complex system in which liquid nitrile rubber, stabilizer and curing agent coexist, reduce local surface tension and promote bubble film rupture, and can quickly destroy entrained bubbles and inhibit the formation of new bubbles during stirring, defoaming and injection.

[0064] In some preferred embodiments, the silicone defoamer includes BYK-024 and / or BYK-A530.

[0065] By limiting the silicone defoamer to BYK-024 and / or BYK-A530, the defoaming behavior can be matched with the rheology of the system, avoiding residual pores due to weak defoaming and avoiding pinholes, fisheyes or interface defects due to insufficient compatibility of the defoamer.

[0066] Because air bubbles are effectively eliminated, the porosity of the cured material is reduced, and the resin and rubber phases are more evenly distributed, thus ensuring the compactness, smoothness, and dielectric or mechanical stability of the cured body. At the same time, in conjunction with the effects of stabilizers and regulators, this silicone defoamer can also reduce local defects caused by foam retention during storage, mixing, and construction, thereby improving the reliability and consistency of epoxy resin compositions in anti-corrosion coatings, potting, and structural bonding.

[0067] It should be noted that when BYK-024 and BYK-A530 are used alone, the appropriate matching scheme can be selected according to different formulation viscosities and application temperatures; when used in combination, the probability of foam regeneration can be further reduced through the synergistic effect of immediate foam defoaming and continuous foam suppression. This process improves the defoaming efficiency of the system without significantly disturbing the compatibility balance of epoxy resin, liquid nitrile rubber, and curing agent.

[0068] In some implementations, the modifier includes fumed silica.

[0069] The aforementioned modifier can form a physical network structure with the epoxy resin and liquid nitrile rubber in the system, thereby improving the overall thixotropic properties of the composition, inhibiting the sedimentation and stratification of the liquid nitrile rubber during storage, and further improving the long-term storage stability of this epoxy composition.

[0070] In a second aspect, the present invention provides a method for preparing an epoxy resin composition as described in the first aspect, comprising the following steps:

[0071] 1) The epoxy resin and stabilizer are stirred once to obtain the first intermediate product;

[0072] 2) The first intermediate product and liquid nitrile rubber are stirred a second time to obtain the second intermediate product;

[0073] 3) The second intermediate product, regulator, and defoamer are stirred three times to obtain the third intermediate product;

[0074] 4) The third intermediate product and the curing agent are stirred four times to obtain an epoxy resin composition.

[0075] In this invention, the preparation method of the above-mentioned epoxy resin composition adopts the stepwise feeding and staged stirring process of this invention. Specifically, the stabilizer and epoxy resin are first pre-mixed, and the epoxy group is pre-activated by the ether bond compatibility of the stabilizer. Then, liquid nitrile rubber, regulator, and defoamer are introduced respectively, and finally, a curing agent is compounded. This avoids the phase separation problem caused by the direct mixing of liquid nitrile rubber with a large amount of epoxy.

[0076] Among them, the ether bonds in the stabilizer can form hydrogen bonds or dipole-dipole interactions with the ether groups of epoxy resin and the carboxylic acid groups of liquid nitrile rubber, respectively, filling the polar gap between the two phases, weakening the interfacial repulsion, and thus inhibiting the precipitation and sedimentation of the rubber phase; stepwise mixing can make the liquid nitrile rubber uniformly dispersed in the epoxy resin, and the use of regulators to construct a three-dimensional thixotropic network restricts the migration of the rubber phase.

[0077] This preparation method effectively solves the defects of poor compatibility and easy stratification and sedimentation in traditional toughened epoxy systems, and significantly improves the long-term storage stability of the composition. At the same time, the uniformly dispersed rubber phase can form toughening micro-regions inside the curing system, and the cross-linking network structure is optimized by the synergistic modification of aliphatic amine and polyether amine compound curing system. While significantly improving the toughness of the material, it ensures that the tensile, adhesive and other mechanical properties do not decrease, and achieves a synergistic balance between storage stability, component compatibility, toughening effect and comprehensive mechanical properties.

[0078] In some embodiments, the temperature for one stirring session is 30°C to 40°C, and the stirring time is 15 min to 20 min.

[0079] By limiting the stirring temperature and time to the range mentioned above, the stabilizer can be fully compatible and integrated with the epoxy resin, thereby improving the matrix compatibility in advance and further reducing the tendency for phase separation between the nitrile rubber and the epoxy matrix in the subsequent process.

[0080] For example, the temperature of a single stirring is 30°C, 31°C, 32°C, 33°C, 34°C, 35°C, 36°C, 37°C, 38°C, 39°C, or 40°C, and the stirring time is any value or a range of any two of the following: 15 min, 16 min, 17 min, 18 min, 19 min, or 20 min.

[0081] In some embodiments, the temperature for secondary stirring is 35°C to 45°C, and the time for secondary stirring is 20 min to 25 min.

[0082] By limiting the secondary stirring temperature and time to the above range, liquid nitrile rubber can be uniformly dispersed in the epoxy matrix, avoiding local agglomeration of the rubber phase and further improving the storage stability of the system.

[0083] For example, the temperature for the three stirrings is 35℃, 36℃, 37℃, 38℃, 39℃, 40℃, 41℃, 42℃, 43℃, 44℃, or 45℃, and the stirring time for the three stirrings is any value or a range of any two of the following: 20min, 21min, 22min, 23min, 24min, or 25min.

[0084] In some embodiments, the temperature for the three stirrings is 25°C to 35°C, and the stirring time for the three stirrings is 10 min to 15 min.

[0085] By limiting the stirring temperature and time to the above range for the three stirring cycles, the regulator can fully construct a thixotropic network to restrict the migration of the rubber phase, inhibit storage stratification, and further balance the rheological properties and toughening effect of the system.

[0086] For example, the temperature for the three stirrings is 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, 31°C, 32°C, 33°C, 34°C, or 35°C, and the stirring time for the three stirrings is any value or a range of any two of 10 min, 11 min, 12 min, 13 min, 14 min, or 15 min.

[0087] In some embodiments, the temperature for the four stirrings is 20°C to 25°C, and the stirring time for the four stirrings is 8 min to 12 min.

[0088] By limiting the temperature and time of the four stirring cycles to the above range, the degree of pre-reaction can be controlled at low temperature to prevent premature local solidification and further ensure the uniformity of mixing and long-term storage stability.

[0089] For example, the temperature for the four stirrings is 20°C, 21°C, 22°C, 23°C, 24°C, or 25°C, and the stirring time for the four stirrings is any value or a range of any two of the following: 8 min, 9 min, 10 min, 11 min, or 12 min.

[0090] In some embodiments, after four stirrings, a degassing treatment is further included; wherein the pressure of the degassing treatment is 0.02 Pa to 0.09 Pa, and the time of the degassing treatment is 5 min to 10 min.

[0091] By limiting the degassing pressure and time to the above range, the micro-bubbles introduced by stirring can be completely eliminated, preventing internal defects from forming during curing, and further ensuring the stable performance of the rubber's toughening effect and overall mechanical properties.

[0092] For example, the pressure of the degassing treatment is 0.02 Pa, 0.03 Pa, 0.04 Pa, 0.05 Pa, 0.06 Pa, 0.07 Pa, 0.08 Pa, or 0.09 Pa, and the degassing treatment time is any value or a range of any two of the following: 5 min, 6 min, 7 min, 8 min, 9 min, or 10 min.

[0093] Thirdly, the present invention provides an application of the epoxy resin composition as described in the first aspect in the potting of electronic devices, industrial structural bonding, preparation of industrial anti-corrosion coatings, or preparation of composite matrix.

[0094] It should be noted that in electronic device potting, the storage stability and uniform dispersion of the composition can reduce potting defects and improve device reliability; in structural bonding, the balance between toughness and strength can extend the service life of the joint.

[0095] In this invention, the liquid nitrile rubber component in the above-mentioned epoxy resin composition works synergistically with the stabilizer to improve the compatibility between the rubber phase and the epoxy resin phase, and to inhibit sedimentation, stratification and local agglomeration during storage and use.

[0096] Curing agents composed of fatty amines and polyether amines further regulate the curing reaction rate and cross-linking structure, enabling the system to maintain good construction uniformity during potting, bonding, coating or composite molding, thereby improving the toughness, strength and interfacial stability of the cured material.

[0097] Defoamers and regulators help reduce internal defects and optimize molding quality, thereby improving the potting reliability of electronic devices, structural bonding durability, anti-corrosion coating protection life, and the overall service performance of composite matrix. Therefore, they are suitable for the above-mentioned industrial application scenarios.

[0098] Specifically, for industrial anti-corrosion coatings, electronic potting, fiber-reinforced composite matrix and structural bonding scenarios, the above-mentioned epoxy resin composition is not prone to sedimentation, delamination or precipitation during storage, has relatively stable viscosity and flow state during construction or potting, and the material obtained after curing has both improved toughness and balanced mechanical properties.

[0099] To further understand the present invention, the technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0100] The present invention will be further described below with reference to specific embodiments.

[0101] Unless otherwise specified, all reagents involved in the embodiments of this invention are commercially available products and can be obtained through commercial channels.

[0102] Example 1

[0103] An epoxy resin composition comprising the following components in parts by weight:

[0104] 95 parts epoxy resin, 4 parts stabilizer, 10 parts liquid nitrile rubber, 0.4 parts regulator, 0.2 parts defoamer, and 28 parts curing agent;

[0105] The epoxy resin used is bisphenol A type epoxy resin E-51 with a number average molecular weight of 380 Da; the stabilizer used is diethylene glycol monobutyl ether; the liquid nitrile rubber used is carboxyl-terminated liquid nitrile rubber (CTBN) with a number average molecular weight of 4000, an acid value of 0.65 mmol / g, and an acrylonitrile content of 25%; the regulator used is fumed silica; the defoamer used is BYK-024; the curing agent is obtained by mixing curing agent T31 and D230 linear polyetheramine at a mass ratio of 1:1, and the number average molecular weight of D230 linear polyetheramine is 240 Da.

[0106] Using the components described above in parts by weight, an epoxy resin composition is prepared, specifically including the following steps:

[0107] (1) Mix epoxy resin with stabilizer and stir at 35°C for 17.5 min to obtain a homogeneous base liquid (first intermediate product).

[0108] (2) Divide the above-mentioned carboxyl-terminated liquid nitrile rubber into 3 equal parts and add them into the base liquid (first intermediate product) obtained in step (1) in 3 batches. Stir at 40°C for 22.5 min to obtain a uniformly dispersed toughening mother liquor (second intermediate product).

[0109] (3) Add regulator and defoamer to toughening mother liquor in sequence, stir at 30°C for 12.5 min to obtain third intermediate product;

[0110] (4) At 22.5℃, add curing agent to the third intermediate product and stir for 10 min;

[0111] (5) Under a pressure of 0.055 Pa, the product obtained in step (4) is subjected to vacuum degassing treatment for 7.5 min to obtain an epoxy resin composition.

[0112] Example 2

[0113] An epoxy resin composition comprising the following components in parts by weight:

[0114] 90 parts epoxy resin, 3 parts stabilizer, 5 parts liquid nitrile rubber, 0.2 parts regulator, 0.1 parts defoamer, and 22 parts curing agent;

[0115] The epoxy resin used is bisphenol A type epoxy resin E-44 with a number average molecular weight of 440 Da; the stabilizer used is diethylene glycol monobutyl ether; the liquid nitrile rubber used is carboxyl-terminated liquid nitrile rubber (CTBN) with a number average molecular weight of 5000 Da, an acid value of 0.85 mmol / g, and an acrylonitrile content of 30%; the regulator used is fumed silica; the defoamer used is BYK-A530; the curing agent is obtained by mixing curing agent 650 and D400 linear polyetheramine at a mass ratio of 1:0.9, where the number average molecular weight of D400 linear polyetheramine is 400 Da.

[0116] Using the components described above in parts by weight, an epoxy resin composition is prepared, specifically including the following steps:

[0117] (1) Mix epoxy resin with stabilizer and stir at 30°C for 15 min to obtain a homogeneous base liquid (first intermediate product).

[0118] (2) Divide the above-mentioned carboxyl-terminated liquid nitrile rubber into 3 equal parts and add them into the base liquid (first intermediate product) obtained in step (1) in 3 batches. Stir at 35°C for 20 min to obtain a uniformly dispersed toughening mother liquor (second intermediate product).

[0119] (3) Add regulator and defoamer to toughening mother liquor in sequence, stir at 25°C for 10 min to obtain third intermediate product;

[0120] (4) At 20°C, add curing agent to the third intermediate product and stir for 8 minutes;

[0121] (5) Under a pressure of 0.02 Pa, the product obtained in step (4) is subjected to vacuum degassing treatment for 5 min to obtain an epoxy resin composition.

[0122] Example 3

[0123] An epoxy resin composition comprising the following components in parts by weight:

[0124] 100 parts epoxy resin, 5 parts stabilizer, 8 parts liquid nitrile rubber, 0.5 parts regulator, 0.25 parts defoamer, and 32 parts curing agent;

[0125] The epoxy resin used is bisphenol A type epoxy resin E-51 with a number average molecular weight of 400 Da; the stabilizer used is diethylene glycol monobutyl ether; the liquid nitrile rubber used is carboxyl-terminated liquid nitrile rubber (CTBN) with a number average molecular weight of 3000 Da, an acid value of 0.45 mmol / g, and an acrylonitrile content of 24%; the regulator used is fumed silica; the defoamer used is BYK-024; and the curing agent is obtained by mixing curing agent T31 and D230 linear polyetheramine at a mass ratio of 1:1.3, where the number average molecular weight of D230 linear polyetheramine is 240 Da.

[0126] Using the components described above in parts by weight, an epoxy resin composition is prepared, specifically including the following steps:

[0127] (1) Mix epoxy resin with stabilizer and stir at 40°C for 20 min to obtain a homogeneous base liquid (first intermediate product).

[0128] (2) Divide the above-mentioned carboxyl-terminated liquid nitrile rubber into 3 equal parts and add them into the base liquid (first intermediate product) obtained in step (1) in 3 batches. Stir at 45°C for 25 minutes to obtain a uniformly dispersed toughening mother liquor (second intermediate product).

[0129] (3) Add regulator and defoamer to toughening mother liquor in sequence, stir at 35°C for 15 min to obtain third intermediate product;

[0130] (4) At 25°C, add curing agent to the third intermediate product and stir for 12 min;

[0131] (5) Under a pressure of 0.09 Pa, the product obtained in step (4) is subjected to vacuum degassing treatment for 10 min to obtain an epoxy resin composition.

[0132] Example 4

[0133] An epoxy resin composition comprising the following components in parts by weight:

[0134] 92 parts epoxy resin, 5 parts stabilizer, 12 parts liquid nitrile rubber, 0.5 parts regulator, 0.15 parts defoamer, and 26 parts curing agent;

[0135] The epoxy resin used is bisphenol A type epoxy resin E-51 with a number average molecular weight of 380 Da; the stabilizer used is diethylene glycol monobutyl ether; the liquid nitrile rubber used is carboxyl-terminated liquid nitrile rubber (CTBN) with a number average molecular weight of 4000, an acid value of 0.65 mmol / g, and an acrylonitrile content of 25%; the regulator used is fumed silica; the defoamer used is BYK-024; and the curing agent is obtained by mixing curing agent T31 and D230 linear polyetheramine at a mass ratio of 1:1, with the number average molecular weight of D230 linear polyetheramine being 240 Da.

[0136] Using the components described above in parts by weight, an epoxy resin composition is prepared, specifically including the following steps:

[0137] (1) Mix epoxy resin with stabilizer and stir at 32°C for 18 min to obtain a homogeneous base liquid (first intermediate product).

[0138] (2) Divide the above-mentioned carboxyl-terminated liquid nitrile rubber into 3 equal parts and add them into the base liquid (first intermediate product) obtained in step (1) in 3 batches. Stir at 38°C for 23 min to obtain a uniformly dispersed toughening mother liquor (second intermediate product).

[0139] (3) Add regulator and defoamer to toughening mother liquor in sequence, stir at 31°C for 14 min to obtain third intermediate product;

[0140] (4) At 23°C, add curing agent to the third intermediate product and stir for 9 min;

[0141] (5) Under a pressure of 0.08 Pa, the product obtained in step (4) is subjected to vacuum degassing treatment for 6 min to obtain an epoxy resin composition.

[0142] Example 5

[0143] An epoxy resin composition comprising the following components in parts by weight:

[0144] 98 parts epoxy resin, 6 parts stabilizer, 15 parts liquid nitrile rubber, 0.6 parts regulator, 0.3 parts defoamer, and 35 parts curing agent;

[0145] The epoxy resin used is bisphenol A type epoxy resin E-51 with a number average molecular weight of 380 Da; the stabilizer used is diethylene glycol monobutyl ether; the liquid nitrile rubber used is carboxyl-terminated liquid nitrile rubber (CTBN) with a number average molecular weight of 4000, an acid value of 0.65 mmol / g, and an acrylonitrile content of 25%; the regulator used is fumed silica; the defoamer used is BYK-024; and the curing agent is obtained by mixing curing agent T31 and D230 linear polyetheramine at a mass ratio of 1:1, with the number average molecular weight of D230 linear polyetheramine being 240 Da.

[0146] Using the components described above in parts by weight, an epoxy resin composition is prepared, specifically including the following steps:

[0147] (1) Mix epoxy resin with stabilizer and stir at 37°C for 16 min to obtain a homogeneous base liquid (first intermediate product).

[0148] (2) Divide the above-mentioned carboxyl-terminated liquid nitrile rubber into 3 equal parts and add them into the base liquid (first intermediate product) obtained in step (1) in 3 batches. Stir at 41°C for 21 min to obtain a uniformly dispersed toughening mother liquor (second intermediate product).

[0149] (3) Add regulator and defoamer to toughening mother liquor in sequence, stir at 28°C for 11 min to obtain third intermediate product;

[0150] (4) At 21°C, add curing agent to the third intermediate product and stir for 11 min;

[0151] (5) Under a pressure of 0.04 Pa, the product obtained in step (4) is subjected to vacuum degassing treatment for 8 min to obtain an epoxy resin composition.

[0152] Example 6

[0153] An epoxy resin composition comprising the following components in parts by weight:

[0154] 105 parts epoxy resin, 4 parts stabilizer, 6 parts liquid nitrile rubber, 0.3 parts regulator, 0.2 parts defoamer, and 30 parts curing agent;

[0155] The epoxy resin used is bisphenol A type epoxy resin E-51 with a number average molecular weight of 380 Da; the stabilizer used is diethylene glycol monobutyl ether; the liquid nitrile rubber used is carboxyl-terminated liquid nitrile rubber (CTBN) with a number average molecular weight of 4000, an acid value of 0.65 mmol / g, and an acrylonitrile content of 25%; the regulator used is fumed silica; the defoamer used is BYK-024; and the curing agent is obtained by mixing curing agent T31 and D230 linear polyetheramine at a mass ratio of 1:1, with the number average molecular weight of D230 linear polyetheramine being 240 Da.

[0156] Using the components described above in parts by weight, an epoxy resin composition is prepared, specifically including the following steps:

[0157] (1) Mix epoxy resin with stabilizer and stir at 31°C for 19 min to obtain a homogeneous base liquid (first intermediate product).

[0158] (2) Divide the above-mentioned carboxyl-terminated liquid nitrile rubber into 3 equal parts and add them into the base liquid (first intermediate product) obtained in step (1) in 3 batches. Stir at 43°C for 24 min to obtain a uniformly dispersed toughening mother liquor (second intermediate product).

[0159] (3) Add regulator and defoamer to toughening mother liquor in sequence, stir at 33℃ for 13 min to obtain third intermediate product;

[0160] (4) At 24.5℃, add curing agent to the third intermediate product and stir for 10.5 min;

[0161] (5) Under a pressure of 0.06 Pa, the product obtained in step (4) is subjected to vacuum degassing treatment for 9 min to obtain an epoxy resin composition.

[0162] Comparative Example 1

[0163] An epoxy resin composition comprising the following components in parts by weight:

[0164] 95 parts epoxy resin, 0.4 parts regulator, 0.2 parts defoamer, and 28 parts curing agent;

[0165] The epoxy resin used is bisphenol A type epoxy resin E-51 with a number average molecular weight of 380 Da; the regulator used is fumed silica; the defoamer used is BYK-024; the curing agent is obtained by mixing curing agent T31 and D230 linear polyetheramine at a mass ratio of 1:1, and the number average molecular weight of D230 linear polyetheramine is 240 Da.

[0166] Using the components described above in parts by weight, an epoxy resin composition is prepared, specifically including the following steps:

[0167] (1) Stir the epoxy resin at 35°C for 17.5 min to obtain a homogeneous base liquid;

[0168] (2) Add regulator and defoamer to the base liquid obtained in step (1) in sequence, and stir at 30°C for 12.5 min;

[0169] (3) At 22.5℃, add curing agent to the product obtained in step (2) and stir for 10 min;

[0170] (4) Under a pressure of 0.055 Pa, the product obtained in step (3) is subjected to vacuum degassing treatment for 7.5 min to obtain an epoxy resin composition.

[0171] Comparative Example 2

[0172] An epoxy resin composition comprising the following components in parts by weight:

[0173] 95 parts epoxy resin, 10 parts liquid nitrile rubber, 0.4 parts regulator, 0.2 parts defoamer, and 28 parts curing agent;

[0174] The epoxy resin used is bisphenol A type epoxy resin E-51 with a number average molecular weight of 380 Da; the regulator used is fumed silica; the defoamer used is BYK-024; the curing agent is obtained by mixing curing agent T31 and D230 linear polyetheramine at a mass ratio of 1:1, and the number average molecular weight of D230 linear polyetheramine is 240 Da.

[0175] Using the components described above in parts by weight, an epoxy resin composition is prepared, specifically including the following steps:

[0176] (1) Stir the epoxy resin at 35°C for 17.5 min to obtain a homogeneous base liquid;

[0177] (2) Divide the above-mentioned carboxyl-terminated liquid nitrile rubber into 3 equal parts and add them into the base liquid obtained in step (1) in 3 batches. Stir at 40°C for 22.5 min to obtain a uniformly dispersed toughening mother liquor.

[0178] (3) Add regulator and defoamer to toughening mother liquor in sequence, and stir at 30°C for 12.5 min;

[0179] (4) At 22.5℃, add curing agent to the product obtained in step (3) and stir for 10 min;

[0180] (5) Under a pressure of 0.055 Pa, the product obtained in step (4) is subjected to vacuum degassing treatment for 7.5 min to obtain an epoxy resin composition.

[0181] Comparative Example 3

[0182] An epoxy resin composition comprising the following components in parts by weight:

[0183] 95 parts epoxy resin, 4 parts butyl glycidyl ether, 10 parts liquid nitrile rubber, 0.4 parts regulator, 0.2 parts defoamer, and 28 parts curing agent;

[0184] The epoxy resin used is bisphenol A type epoxy resin E-51 with a number average molecular weight of 380 Da; the regulator used is fumed silica; the defoamer used is BYK-024; the curing agent is obtained by mixing curing agent T31 and D230 linear polyetheramine at a mass ratio of 1:1, and the number average molecular weight of D230 linear polyetheramine is 240 Da.

[0185] Using the components described above in parts by weight, an epoxy resin composition is prepared, specifically including the following steps:

[0186] (1) Mix epoxy resin with butyl glycidyl ether and stir at 35°C for 17.5 min to obtain a homogeneous base solution;

[0187] (2) Divide the above-mentioned carboxyl-terminated liquid nitrile rubber into 3 equal parts and add them into the base liquid obtained in step (1) in 3 batches. Stir at 40°C for 22.5 min to obtain a uniformly dispersed toughening mother liquor.

[0188] (3) Add regulator and defoamer to toughening mother liquor in sequence, and stir at 30°C for 12.5 min;

[0189] (4) At 22.5℃, add curing agent to the product obtained in step (3) and stir for 10 min;

[0190] (5) Under a pressure of 0.055 Pa, the product obtained in step (4) is subjected to vacuum degassing treatment for 7.5 min to obtain an epoxy resin composition.

[0191] Comparative Example 4

[0192] An epoxy resin composition comprising the following components in parts by weight:

[0193] 95 parts epoxy resin, 4 parts stabilizer, 10 parts liquid nitrile rubber, 0.4 parts regulator, 0.2 parts defoamer, and 28 parts curing agent;

[0194] The epoxy resin used is bisphenol A type epoxy resin E-51 with a number average molecular weight of 380 Da; the stabilizer used is diethylene glycol monobutyl ether; the liquid nitrile rubber used is carboxyl-terminated liquid nitrile rubber (CTBN) with a number average molecular weight of 4000, an acid value of 0.65 mmol / g, and an acrylonitrile content of 25%; the regulator used is fumed silica; the defoamer used is BYK-024; and the curing agent used is curing agent T31.

[0195] Using the components described above in parts by weight, an epoxy resin composition is prepared, specifically including the following steps:

[0196] (1) Mix epoxy resin with stabilizer and stir at 35°C for 17.5 min to obtain a homogeneous base liquid (first intermediate product).

[0197] (2) Divide the above-mentioned carboxyl-terminated liquid nitrile rubber into 3 equal parts and add them into the base liquid (first intermediate product) obtained in step (1) in 3 batches. Stir at 40°C for 22.5 min to obtain a uniformly dispersed toughening mother liquor (second intermediate product).

[0198] (3) Add regulator and defoamer to toughening mother liquor in sequence, stir at 30°C for 12.5 min to obtain third intermediate product;

[0199] (4) At 22.5℃, add curing agent to the third intermediate product and stir for 10 min;

[0200] (5) Under a pressure of 0.055 Pa, the product obtained in step (4) is subjected to vacuum degassing treatment for 7.5 min to obtain an epoxy resin composition.

[0201] Test Example 1

[0202] Equal amounts of the epoxy resin compositions prepared in Examples 1-6 and Comparative Examples 1-4 were subjected to gradient curing. The curing process was as follows: first, curing was carried out at room temperature (25°C) for 2 hours; then the temperature was increased to 60°C and held for 2 hours; finally, the temperature was increased to 95°C and held for 1 hour; after natural cooling to room temperature, the samples were obtained as test samples. The storage stability, impact toughness improvement rate, tensile strength, agglomeration, and aging mechanical retention rate of the test samples were tested.

[0203] The detection methods for each indicator are as follows:

[0204] 1. Storage stability

[0205] Equal masses of epoxy resin composition samples were sealed in transparent airtight containers and placed in a constant temperature and humidity environment at 25°C for observation. The failure criteria were defined as the appearance of obvious precipitation at the bottom of the sample, stratification at the system interface, or flocculent precipitation on the surface. The number of days from standing to failure was recorded, which is the storage stability time. Three parallel samples were prepared for each group of samples, and the average value was taken. The results are shown in Table 1.

[0206] Table 1

[0207]

[0208] 2. Impact toughness improvement rate

[0209] According to GB / T2567-2008 "Test Method for Performance of Resin Castings", unnotched simply supported beam impact standard specimens were prepared. Impact tests were carried out using a simply supported beam impact testing machine with an impact pendulum energy of 2J. Each group was tested in parallel for 5 times and the average impact strength was taken. An equal mass of bisphenol A type epoxy resin E-51 was used as a blank control group. The impact toughness improvement rate was calculated according to formula (1). The results are shown in Table 2.

[0210] Formula (1);

[0211] In formula (1), A1 is the impact strength of a blank pure epoxy resin sample, in kJ / m. 2 A2 represents the impact strength of the blank control group, in kJ / m². 2 Impact toughness improvement rate, unit:%.

[0212] Table 2

[0213]

[0214] 3. Tensile strength

[0215] Standard tensile specimens were prepared according to GB / T2567-2008 "Test Methods for Properties of Resin Castings". The specimens were tested using a universal testing machine at a tensile rate of 5 mm / min. The maximum tensile stress at fracture was recorded. Each group of specimens was tested in parallel five times, and the average value was taken. The results are shown in Table 3.

[0216] 4. Family reunion status

[0217] The microstructure of the solidified casting cross-section was observed using scanning electron microscopy (SEM) at a magnification of 5000x. Five randomly selected fields of view were used to observe the morphology of the dispersed phase of the liquid nitrile rubber. The criteria for determination were: no agglomerates larger than 2 μm were considered non-agglomerated; the presence of particles between 2 and 10 μm indicated localized agglomeration; and the appearance of continuous agglomeration areas larger than 10 μm indicated severe agglomeration. The results are shown in Table 3.

[0218] 5. Mechanical retention rate during aging

[0219] Equal mass of test samples were placed in an 80℃ thermo-oxidative aging oven and kept at a constant temperature for 168 hours. After aging, the samples were cooled to room temperature and the tensile strength of the samples was tested again. The mechanical retention rate of aging was calculated using formula (2), and the results are shown in Table 3.

[0220] Formula (2);

[0221] In formula (2), σ1 is the initial tensile strength of the sample before thermal aging, in MPa; σ2 is the tensile strength of the sample after constant temperature thermo-oxidative aging treatment, in MPa; and the mechanical retention rate after aging, in MPa.

[0222] Table 3

[0223]

[0224] As shown in Table 1, compared with the comparative example, the epoxy resin composition provided in this embodiment of the invention has a longer room temperature storage period, a higher impact toughness improvement rate, a more balanced tensile strength, a rubber-free agglomeration microstructure, and a higher mechanical retention rate under thermo-oxidative aging. The storage period is increased to more than 30 days, with no stratification or rubber phase precipitation, demonstrating excellent storage performance. The impact toughness is improved by 70%~100%, and the mechanical retention rate under aging is stable at ≥90%. This proves that the epoxy resin composition provided in this invention effectively solves the technical problems of poor two-phase compatibility, easy stratification and precipitation during storage, significant strength decay accompanied by toughening, easy agglomeration of the rubber phase, and severe mechanical property degradation under long-term thermo-oxidative conditions in existing liquid nitrile rubber toughened epoxy systems.

[0225] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An epoxy resin composition, characterized in that, Includes the following components by weight: 90-105 parts epoxy resin, 5-15 parts liquid nitrile rubber, 3-6 parts stabilizer, 22-35 parts curing agent, 0.1-0.3 parts defoamer, and 0.2-0.6 parts regulator; The liquid nitrile rubber includes at least one of carboxyl-terminated liquid nitrile rubber, hydroxyl-terminated liquid nitrile rubber, and epoxy-terminated liquid nitrile rubber. The stabilizer includes diethylene glycol monobutyl ether and / or triethylene glycol monobutyl ether; The curing agent includes aliphatic amines and polyether amines, wherein the aliphatic amines include curing agent T31 and / or curing agent 650, and the polyether amines include D230 linear polyether amine and / or D400 linear polyether amine.

2. The epoxy resin composition according to claim 1, characterized in that, The number-average molecular weight of the polyetheramine is 240 Da to 400 Da.

3. The epoxy resin composition according to claim 1 or 2, characterized in that, The mass ratio of the fatty amine to the polyether amine is 1:(0.9~1.3).

4. The epoxy resin composition according to any one of claims 1 to 3, characterized in that, The number average molecular weight of the epoxy resin is 380 Da to 440 Da.

5. The epoxy resin composition according to any one of claims 1 to 4, characterized in that, The liquid nitrile rubber has a number average molecular weight of 3000 Da to 5000 Da, an acid value of 0.45 mmol / g to 0.85 mmol / g, and an acrylonitrile mass fraction of 24% to 30%.

6. The epoxy resin composition according to any one of claims 1 to 5, characterized in that, The epoxy resin includes bisphenol A type epoxy resin E-51 and / or bisphenol A type epoxy resin E-44; And / or, the defoamer includes silicone defoamers; And / or, the modifier includes fumed silica.

7. The epoxy resin composition according to claim 6, characterized in that, The silicone defoamer includes BYK-024 and / or BYK-A530.

8. A method for preparing the epoxy resin composition according to any one of claims 1 to 7, characterized in that, Includes the following steps: 1) The epoxy resin and stabilizer are stirred once to obtain a first intermediate product; 2) The first intermediate product and the liquid nitrile rubber are stirred a second time to obtain the second intermediate product; 3) The second intermediate product, the regulator, and the defoamer are stirred three times to obtain the third intermediate product; 4) The third intermediate product and the curing agent are stirred four times to obtain the epoxy resin composition.

9. The preparation method according to claim 8, characterized in that, The temperature of the first stirring is 30℃~40℃, and the stirring time is 15min~20min; And / or, the temperature of the secondary stirring is 35℃~45℃, and the time of the secondary stirring is 20min~25min; And / or, the temperature of the three stirrings is 25℃~35℃, and the time of the three stirrings is 10min~15min; And / or, the temperature of the four stirrings is 20℃~25℃, and the time of the four stirrings is 8min~12min; And / or, after the four stirrings, a degassing treatment is further included; wherein the pressure of the degassing treatment is 0.02 Pa to 0.09 Pa, and the time of the degassing treatment is 5 min to 10 min.

10. The application of an epoxy resin composition as described in any one of claims 1 to 7 in the potting of electronic devices, industrial structural bonding, preparation of industrial anti-corrosion coatings, or preparation of composite matrix.

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