High-weather-resistant epoxy curing agent and preparation method thereof

Abstract

The invention relates to the technical field of epoxy hardeners, in particular to a high-weather-resistance epoxy hardener and a preparation method thereof. Comprising the following raw materials in parts by weight: 20-40 parts of epoxy resin, 40-80 parts of a curing agent, 2-10 parts of an accelerant, 1-5 parts of filler, 1-5 parts of a thixotropic agent, 5-15 parts of a reactive diluent, 0.1-0.5 part of a defoaming agent, 5-10 parts of an acrylic monomer, 0.1-1.0 part of diethoxyacetophenone and 0.01-0.5 part of a coupling agent. The high-weather-resistant epoxy curing agent disclosed by the invention has a relatively good leveling effect, a film-forming substance is good in weather resistance, the influence of natural factors such as sunlight, rainwater and temperature change can be effectively resisted, phenomena such as aging, yellowing and pulverization are not easy to occur, and the service life of an epoxy resin product is remarkably prolonged; the method for preparing the high-weather-resistance epoxy curing agent is easy to operate, convenient to control, high in production efficiency, low in production cost and suitable for large-scale production.

Description

Technical Field

[0001] The invention relates to the technical field of epoxy curing agents, and in particular to a highly weather-resistant epoxy curing agent and a preparation method thereof. Background Art

[0002] Epoxy resin is widely used in civil engineering, electronics, aerospace, automotive machinery and other fields. It is an important part of national production. China is currently the world's largest epoxy resin producer. However, epoxy resin is an amorphous viscous liquid. It is plastic when heated and has no obvious melting point. It softens and gradually melts and becomes sticky when heated. It is insoluble in water and does not harden by itself. Therefore, it has almost no independent use value. It is only when it reacts with a curing agent to form an infusible polymer with a three-dimensional network structure that it has application value. When a certain amount of curing agent is added, it gradually solidifies to form chemical substances with different properties. Therefore, a curing agent must be added to form a formula resin, and a curing reaction must be carried out under certain conditions to form a polymer material with a three-dimensional network structure. Only then will it show various excellent properties and become an epoxy material with real use value.

[0003] At present, commonly used epoxy curing agents are prone to aging, yellowing, and powdering when facing complex natural environments, especially when exposed to sunlight, rain, temperature changes, etc. for a long time, which greatly reduces the service life and performance stability of epoxy resin products. For example, in the electronics industry, if epoxy encapsulation materials use curing agents with poor weather resistance, their insulation and sealing properties may be reduced due to environmental factors, posing a potential threat to the reliability of electronic components.

[0004] In order to improve the weather resistance of epoxy resin products and meet the needs of different fields for high-performance materials, the development of a highly weather-resistant epoxy curing agent and its preparation method has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a highly weather-resistant epoxy curing agent, which has good high weather resistance, can effectively resist the influence of natural factors such as sunlight, rain, temperature changes, etc., is not prone to aging, yellowing, powdering, etc., and significantly extends the service life of epoxy resin products.

[0006] The object of the present invention is to provide a method for preparing a highly weather-resistant epoxy curing agent, which has the advantages of simple operation, convenient control, high production efficiency, low production cost and is suitable for large-scale production.

[0007] The purpose of the present invention is achieved by the following technical scheme: a highly weather-resistant epoxy curing agent, comprising the following raw materials in parts by weight: 20-40 parts of epoxy resin, 40-80 parts of curing agent, 2-10 parts of accelerator, 1-5 parts of filler, 1-5 parts of thixotropic agent, 5-15 parts of active diluent, 0.1-0.5 parts of defoaming agent, 5-10 parts of acrylic monomer, 0.1-1.0 parts of diethoxyacetophenone, and 0.01-0.5 parts of coupling agent.

[0008] The epoxy curing agent in the present invention can effectively resist the influence of natural factors such as sunlight, rain, temperature changes, etc., is not prone to aging, yellowing, powdering and the like, and significantly extends the service life of epoxy resin products; the cured epoxy resin has high strength, hardness and toughness, and has strong resistance to chemical substances such as acids, alkalis, and salts; in addition, it has an efficient curing speed, and can be quickly cured under certain conditions to improve production efficiency. Specifically, in the present invention, the epoxy resin is reacted with the curing agent to form a three-dimensional network structure, thereby achieving curing, the assistance of an external accelerator can accelerate the curing reaction, the addition of fillers can enhance the mechanical properties after curing, the thixotropic agent gives the system good thixotropy, is easy to construct and prevents sagging, the active diluent can reduce the viscosity of the system without affecting the curing performance, the defoaming agent eliminates bubbles in the system, and improves the appearance quality of the product; the addition of acrylic monomers, diethoxyacetophenone and coupling agents can improve the weather resistance of the system and the bonding performance with other materials.

[0009] Preferably, the coupling agent is one or more of β-(3,4-epoxycyclohexylethyl)trimethoxysilane, r-glycidoxytrimethylsilane, and titanate coupling agent.

[0010] The coupling agent added in the present invention can improve the interfacial bonding force between the filler and the epoxy resin, and improve the mechanical properties and weather resistance of the system; that is, one end of the coupling agent molecule reacts with the active group on the surface of the filler, and the other end reacts with the epoxy resin molecule, thereby forming a chemical bond between the filler and the epoxy resin, and improving the interfacial bonding force.

[0011] Preferably, the defoaming agent is one or more of dimethyl polysiloxane, methyl alkyl polysiloxane, and fluorine-containing silicone defoaming agent; the defoaming agent can reduce the surface tension of the system, causing bubbles to burst and escape.

[0012] Preferably, the epoxy resin includes one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, hydrogenated bisphenol A epoxy resin, aliphatic epoxy resin, biphenyl epoxy resin, naphthalene epoxy resin, DCPD epoxy resin and cyanate modified epoxy resin.

[0013] The above specific types of epoxy resins used in the present invention are used as the main matrix material to provide adhesion and mechanical properties. Each specific epoxy resin contains epoxy groups in its molecular structure, which can undergo a ring-opening reaction with a curing agent to form a cross-linked structure.

[0014] Preferably, the curing agent is one or more of pentaerythritol tripropyl mercaptan, pentaerythritol tetrapropyl mercaptan, pentaerythritol dipropyl mercaptan, diethylene triethylammonium, and trimethylolpropane dipropyl mercaptan.

[0015] The curing agent used in the present invention reacts with the epoxy resin to cure the epoxy resin; the active groups in the curing agent react chemically with the epoxy groups of the epoxy resin to form a three-dimensional network structure, thereby converting the epoxy resin from a liquid state to a solid state.

[0016] Preferably, the accelerator is one or more of salicylic acid, 2,4,6-tris(dimethylaminomethyl)phenol, 4-nonylphenol, N-aminoethylpiperazine, ethyl levulinate, and triethylenetetramine.

[0017] The above specific accelerator used in the present invention can accelerate the reaction speed of the epoxy resin and the curing agent, that is, the accelerator can reduce the activation energy of the reaction and make the reaction easier to proceed.

[0018] Preferably, the acrylate monomer is one or more of methyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, tetrahydrofuran (meth)acrylate, isobornyl (meth)acrylate, N,N-dimethylacrylamide, multifunctional (meth)acrylate, polyethylene glycol diacrylate, ethoxylated bisphenol A diacrylate, and (meth)acrylic acid.

[0019] In the present invention, the weather resistance and bonding performance of the system can be improved by adding an acrylate monomer to the epoxy curing agent. The unsaturated double bonds in the specific acrylic monomer can react with oxygen in the air to form a cross-linked structure, thereby improving the weather resistance; at the same time, the acrylic monomer can also react with the active groups on the surface of materials such as epoxy resins to improve the bonding performance; diethoxyacetophenone acts as a photoinitiator to initiate the polymerization reaction of the acrylic monomer under ultraviolet irradiation, further improving the weather resistance of the system.

[0020] Preferably, the filler is one or more of fumed silica, calcium carbonate, alumina, aluminum hydroxide, titanium dioxide, carbon black, and organic bentonite.

[0021] The filler particles in the present invention play a reinforcing role in the epoxy curing agent system, bear part of the stress, and improve the overall mechanical properties.

[0022] Preferably, the thixotropic agent is one or more of amorphous silicon dioxide, amorphous wax, bentonite, and modified hydrogenated castor oil.

[0023] The thixotropic agent used in the present invention imparts thixotropy to the system, prevents sagging, and facilitates construction. The above-mentioned specific thixotropic agent forms a structure in a static state, so that the system has a higher viscosity. When subjected to shear force, the structure is destroyed and the viscosity is reduced, which facilitates construction operation.

[0024] Preferably, the active diluent is one or more of 1,2-epoxy-4-vinylcyclohexane and 3,4-epoxycyclohexyl methacrylate.

[0025] The active diluent molecules in the present invention contain active groups, which can participate in the curing reaction, and reduce the viscosity without reducing the performance after curing.

[0026] The present invention also discloses a method for preparing a highly weather-resistant epoxy curing agent, comprising the following steps:

[0027] S1. Add active diluent to epoxy resin according to weight parts, and then mix with acrylic monomer, then add coupling agent and diethoxyacetophenone into the system, heat to 40-60° C., stir for 20-40 minutes, and obtain mixture A for standby use;

[0028] S2. Mix the curing agent, accelerator, filler and thixotropic agent according to weight, heat to 30-50° C. and stir at a rate of 300-340 r / min for 40-80 min to obtain a mixture B for standby use;

[0029] S3. Add mixture B into mixture A, heat to 30-40°C and stir at a rate of 300-340 r / min for 60-80 min. Then add the defoamer into the system and stir at a rate of 30-60 r / min for 60-80 min under vacuum, filter through the sieve, and obtain a highly weather-resistant epoxy curing agent.

[0030] The highly weather-resistant epoxy curing agent in the present invention is prepared by adopting the above method, and the highly weather-resistant epoxy curing agent prepared by the preparation method has good comprehensive performance. The preparation method is simple to operate, convenient to control, high in production efficiency, low in production cost, and suitable for large-scale production.

[0031] The beneficial effects of the present invention are:

[0032] 1. High weather resistance: It can effectively resist the influence of natural factors such as sunlight, rain, temperature changes, and is not prone to aging, yellowing, powdering, etc., which can significantly extend the service life of epoxy resin products.

[0033] 2. Good mechanical properties: The cured epoxy resin has higher strength, hardness and toughness.

[0034] 3. Excellent chemical stability: It has strong resistance to acid, alkali, salt and other chemical substances.

[0035] 4. Good construction performance: including suitable viscosity, thixotropy, etc., which facilitates construction operation.

[0036] 5. Efficient curing speed: It can cure quickly under certain conditions to improve production efficiency. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0038] Example 1

[0039] A highly weather-resistant epoxy curing agent comprises the following raw materials in parts by weight: 20 parts of epoxy resin, 40 parts of curing agent, 2 parts of accelerator, 1 part of filler, 1 part of thixotropic agent, 5 parts of active diluent, 0.1 part of defoaming agent, 5 parts of acrylic monomer, 0.1 part of diethoxyacetophenone and 0.01 part of coupling agent.

[0040] The coupling agent is β-(3,4-epoxycyclohexylethyl)trimethoxysilane. The defoaming agent is dimethyl polysiloxane.

[0041] The epoxy resin includes bisphenol A epoxy resin. The curing agent is pentaerythritol tripropyl mercaptan.

[0042] The accelerator is salicylic acid, the acrylate monomer is methyl methacrylate, and the filler is fumed silica.

[0043] The thixotropic agent is amorphous silicon dioxide. The active diluent is 1,2-epoxy-4-vinylcyclohexane.

[0044] The highly weather-resistant epoxy curing agent is prepared by the following steps:

[0045] S1. According to parts by weight, epoxy resin is diluted with reactive diluent and then mixed with acrylic monomer, and then coupling agent and diethoxyacetophenone are added to the system, heated to 40° C., stirred for 40 min, and mixture A is obtained for standby use;

[0046] S2. Mix the curing agent, accelerator, filler and thixotropic agent according to weight, heat to 30°C and stir at a rate of 340 r / min for 80 min to obtain a mixture B for standby use;

[0047] S3. Add mixture B into mixture A, heat to 30°C and stir at a rate of 340 r / min for 80 min. Then add the defoamer into the system and stir at a rate of 60 r / min for 80 min under vacuum, filter through the sieve, and obtain a highly weather-resistant epoxy curing agent.

[0048] Example 2

[0049] A highly weather-resistant epoxy curing agent comprises the following raw materials in parts by weight: 30 parts of epoxy resin, 60 parts of curing agent, 6 parts of accelerator, 3 parts of filler, 3 parts of thixotropic agent, 10 parts of active diluent, 0.3 parts of defoaming agent, 8 parts of acrylic monomer, 0.5 parts of diethoxyacetophenone and 0.3 parts of coupling agent.

[0050] The coupling agent is r-glycidoxytrimethylsilane. The defoaming agent is methyl alkyl polysiloxane.

[0051] The epoxy resin is composed of bisphenol F epoxy resin, hydrogenated bisphenol A epoxy resin and cyanate modified epoxy resin in a mass ratio of 0.8:0.6:0.9.

[0052] The curing agent is composed of pentaerythritol tripropyl mercaptan, pentaerythritol tetrapropyl mercaptan and trimethylolpropane dipropyl mercaptan in a mass ratio of 0.8:0.7:0.9.

[0053] The accelerator is composed of salicylic acid, 2,4,6-tris(dimethylaminomethyl)phenol and triethylenetetramine in a mass ratio of 0.8:0.9:0.7.

[0054] The acrylic acid ester monomer is composed of methyl methacrylate, N,N-dimethylacrylamide and (meth)acrylic acid in a mass ratio of 0.8:0.7:1.0.

[0055] The filler is aluminum hydroxide. The thixotropic agent is bentonite.

[0056] The active diluent is 3,4-epoxycyclohexyl methacrylate.

[0057] The highly weather-resistant epoxy curing agent is prepared by the following steps:

[0058] S1. Add active diluent to epoxy resin according to weight parts, dilute the mixture and mix it with acrylic monomer, then add coupling agent and diethoxyacetophenone into the system, heat to 50° C., stir for 30 min, and obtain mixture A for standby use;

[0059] S2. Mix the curing agent, accelerator, filler and thixotropic agent according to weight, heat to 40°C and stir at a rate of 320 r / min for 60 min to obtain a mixture B for standby use;

[0060] S3. Add mixture B into mixture A, heat to 35°C and stir at a rate of 320 r / min for 70 min. Then add the defoamer into the system and stir at a rate of 45 r / min for 70 min under vacuum, filter through the sieve, and obtain a highly weather-resistant epoxy curing agent.

[0061] Example 3

[0062] A highly weather-resistant epoxy curing agent comprises the following raw materials in parts by weight: 40 parts of epoxy resin, 80 parts of curing agent, 10 parts of accelerator, 5 parts of filler, 5 parts of thixotropic agent, 15 parts of active diluent, 0.5 parts of defoaming agent, 10 parts of acrylic monomer, 1.0 parts of diethoxyacetophenone and 0.5 parts of coupling agent.

[0063] The coupling agent is a titanate coupling agent.

[0064] The defoamer is a fluorine-containing organosilicon defoamer.

[0065] The epoxy resin is hydrogenated bisphenol A type epoxy resin.

[0066] The curing agent is pentaerythritol tetrapropyl mercaptan.

[0067] The accelerator is 4-nonylphenol.

[0068] The acrylic acid ester monomer is hydroxypropyl methacrylate.

[0069] The filler is titanium dioxide.

[0070] The thixotropic agent is an amorphous wax.

[0071] The active diluent is 3,4-epoxycyclohexyl methacrylate.

[0072] The highly weather-resistant epoxy curing agent is prepared by the following steps:

[0073] S1. According to parts by weight, epoxy resin is diluted with reactive diluent and then mixed with acrylic monomer. Then coupling agent and diethoxyacetophenone are added into the system, heated to 60° C., stirred for 20 min, and mixture A is obtained for standby use.

[0074] S2. Mix the curing agent, accelerator, filler and thixotropic agent according to weight, heat to 50° C. and stir at a rate of 300 r / min for 40 min to obtain a mixture B for standby use;

[0075] S3. Add mixture B into mixture A, heat to 40°C, stir at a rate of 300 r / min for 60 min, then add the defoamer into the system and stir at a rate of 30-r / min for 60 min in vacuum, filter through the sieve, and obtain a highly weather-resistant epoxy curing agent.

[0076] Example 4

[0077] A highly weather-resistant epoxy curing agent comprises the following raw materials in parts by weight: 40 parts of epoxy resin, 80 parts of curing agent, 10 parts of accelerator, 5 parts of filler, 5 parts of thixotropic agent, 15 parts of active diluent, 0.5 parts of defoaming agent, 10 parts of acrylic monomer, 1.0 parts of diethoxyacetophenone and 0.5 parts of coupling agent.

[0078] The coupling agent is r-glycidoxytrimethylsilane.

[0079] The defoaming agent is methyl alkyl polysiloxane.

[0080] The epoxy resin is composed of naphthalene epoxy resin and DCPD epoxy resin in a mass ratio of 1:1.

[0081] The curing agent is trimethylolpropane dipropylene mercaptan.

[0082] The accelerator is composed of 4-nonylphenol and triethylenetetramine in a ratio of 1:0.7.

[0083] The acrylate monomer is polyethylene glycol diacrylate.

[0084] The filler is composed of aluminum hydroxide, carbon black and organic bentonite in a mass ratio of 0.7:0.8:0.5.

[0085] The thixotropic agent is bentonite.

[0086] The active diluent is 1,2-epoxy-4-vinylcyclohexane.

[0087] The highly weather-resistant epoxy curing agent is prepared by the following steps:

[0088] S1. According to parts by weight, epoxy resin is diluted with reactive diluent and then mixed with acrylic monomer. Then coupling agent and diethoxyacetophenone are added into the system, heated to 60° C., stirred for 20 min, and mixture A is obtained for standby use.

[0089] S2. Mix the curing agent, accelerator, filler and thixotropic agent according to weight, heat to 50° C. and stir at a rate of 300 r / min for 40 min to obtain a mixture B for standby use;

[0090] S3. Add mixture B into mixture A, heat to 40°C, stir at a rate of 300 r / min for 60 min, then add the defoamer into the system and stir at a rate of 30-r / min for 60 min in vacuum, filter through the sieve, and obtain a highly weather-resistant epoxy curing agent.

[0091] Example 5

[0092] A highly weather-resistant epoxy curing agent comprises the following raw materials in parts by weight: 40 parts of epoxy resin, 80 parts of curing agent, 10 parts of accelerator, 5 parts of filler, 5 parts of thixotropic agent, 15 parts of active diluent, 0.5 parts of defoaming agent, 10 parts of acrylic monomer, 1.0 parts of diethoxyacetophenone and 0.5 parts of coupling agent.

[0093] The coupling agent is r-glycidoxytrimethylsilane. The defoaming agent is methyl alkyl polysiloxane.

[0094] The epoxy resin is composed of bisphenol F epoxy resin, hydrogenated bisphenol A epoxy resin and cyanate modified epoxy resin in a mass ratio of 0.8:0.6:0.9.

[0095] The curing agent is composed of pentaerythritol tripropyl mercaptan, pentaerythritol tetrapropyl mercaptan and trimethylolpropane dipropyl mercaptan in a mass ratio of 0.8:0.7:0.9.

[0096] The accelerator is composed of salicylic acid, 2,4,6-tris(dimethylaminomethyl)phenol and triethylenetetramine in a mass ratio of 0.8:0.9:0.7.

[0097] The acrylic acid ester monomer is composed of methyl methacrylate, N,N-dimethylacrylamide and (meth)acrylic acid in a mass ratio of 0.8:0.7:1.0.

[0098] The filler is aluminum hydroxide. The thixotropic agent is bentonite.

[0099] The active diluent is 3,4-epoxycyclohexyl methacrylate.

[0100] The highly weather-resistant epoxy curing agent is prepared by the following steps:

[0101] S1. According to parts by weight, epoxy resin is diluted with reactive diluent and then mixed with acrylic monomer. Then coupling agent and diethoxyacetophenone are added into the system, heated to 60° C., stirred for 20 min, and mixture A is obtained for standby use.

[0102] S2. Mix the curing agent, accelerator, filler and thixotropic agent according to weight, heat to 50° C. and stir at a rate of 300 r / min for 40 min to obtain a mixture B for standby use;

[0103] S3. Add mixture B into mixture A, heat to 40°C, stir at a rate of 300 r / min for 60 min, then add the defoamer into the system and stir at a rate of 30-r / min for 60 min in vacuum, filter through the sieve, and obtain a highly weather-resistant epoxy curing agent.

[0104] Comparative Example 1

[0105] The difference between this comparative example and the above-mentioned Example 2 is that no accelerator is used in the raw materials of the epoxy curing agent of this comparative example. The rest of the contents of this comparative example are the same as those of Example 2, and will not be repeated here.

[0106] Comparative Example 2

[0107] The difference between this comparative example and the above-mentioned Example 2 is that no acrylic acid monomer, diethoxyacetophenone and coupling agent are added to the raw materials of the epoxy curing agent of this comparative example. The rest of the contents of this comparative example are the same as those of Example 2 and will not be repeated here.

[0108] The epoxy curing agents prepared in Example 2 and Comparative Examples 1-2 were tested for performance after film formation, and the results are shown in Table 1:

[0109] Neutral salt spray resistance test method: Determined in accordance with GB / T 1771-2007 test method;

[0110] Impact resistance (positive impact) test method: measured in accordance with the GB / T 1732-2020 test method;

[0111] Adhesion: measured according to GB / T9286 test method, technical index ≤ level 1 (01mm cross-cut method);

[0112] Surface drying time: measured according to the test method of GB / T1728-1979, technical index ≤4h.

[0113] Table 1

[0114]

[0115]

[0116] It can be seen from Example 2 that the breathable epoxy curing agent prepared in the present invention has the advantages of good weather resistance, impact resistance, neutral salt spray resistance, as well as good adhesion and surface drying performance.

[0117] From the comparison between Example 2 and Comparative Examples 1-2, it can be seen that under the same conditions, the addition of accelerator, acrylic monomer, diethoxyacetophenone and coupling agent to the formula makes the prepared epoxy curing agent have good weather resistance, impact resistance, neutral salt spray resistance, as well as good adhesion and surface drying performance, and has broad market prospects and application value.

[0118] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A highly weather-resistant epoxy curing agent, characterized in that: The invention comprises the following raw materials in parts by weight: 20-40 parts of epoxy resin, 40-80 parts of curing agent, 2-10 parts of accelerator, 1-5 parts of filler, 1-5 parts of thixotropic agent, 5-15 parts of active diluent, 0.1-0.5 parts of defoaming agent, 5-10 parts of acrylic acid monomer and 0.1-1.0 parts of diethoxyacetophenone.

2. A highly weather-resistant epoxy curing agent according to claim 1, characterized in that: The epoxy curing agent also includes 0.01-0.5 parts of a coupling agent.

3. A highly weather-resistant epoxy curing agent according to claim 1, characterized in that: The epoxy resin is one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, hydrogenated bisphenol A epoxy resin, aliphatic epoxy resin, biphenyl epoxy resin, naphthalene epoxy resin, DCPD epoxy resin and cyanate modified epoxy resin.

4. A highly weather-resistant epoxy curing agent according to claim 1, characterized in that: The curing agent is one or more of pentaerythritol tripropyl mercaptan, pentaerythritol tetrapropyl mercaptan, pentaerythritol dipropyl mercaptan, diethylene triethylammonium, and trimethylolpropane dipropyl mercaptan.

5. A highly weather-resistant epoxy curing agent according to claim 1, characterized in that: The accelerator is one or more of salicylic acid, 2,4,6-tris(dimethylaminomethyl)phenol, 4-nonylphenol, N-aminoethylpiperazine, ethyl levulinate, and triethylenetetramine.

6. A highly weather-resistant epoxy curing agent according to claim 1, characterized in that: The acrylic acid ester monomer is one or more of methyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, tetrahydrofuran (meth)acrylate, isobornyl (meth)acrylate, N,N-dimethylacrylamide, multifunctional (meth)acrylate, polyethylene glycol diacrylate, ethoxylated bisphenol A diacrylate, and (meth)acrylic acid.

7. A highly weather-resistant epoxy curing agent according to claim 1, characterized in that: The filler is one or more of fumed silica, calcium carbonate, aluminum oxide, aluminum hydroxide, titanium dioxide, carbon black, and organic bentonite.

8. A highly weather-resistant epoxy curing agent according to claim 1, characterized in that: The thixotropic agent is one or more of amorphous silicon dioxide, amorphous wax, bentonite and modified hydrogenated castor oil.

9. A highly weather-resistant epoxy curing agent according to claim 1, characterized in that: The active diluent is one or more of 1,2-epoxy-4-vinylcyclohexane and 3,4-epoxycyclohexyl methacrylate.

10. A method for preparing a highly weather-resistant epoxy curing agent according to any one of claims 1 to 9, characterized in that: The steps include: S1. Add active diluent to epoxy resin according to weight parts, and then mix with acrylic monomer, then add coupling agent and diethoxyacetophenone into the system, heat to 40-60° C., stir for 20-40 minutes, and obtain mixture A for standby use; S2. Mix the curing agent, accelerator, filler and thixotropic agent according to weight, heat to 30-50° C. and stir at a rate of 300-340 r / min for 40-80 min to obtain a mixture B for standby use; S3. Add mixture B into mixture A, heat to 30-40°C and stir at a rate of 300-340 r / min for 60-80 min. Then add the defoamer into the system and stir at a rate of 30-60 r / min for 60-80 min under vacuum, filter through the sieve, and obtain a highly weather-resistant epoxy curing agent.

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