Two-component modified epoxy resin adhesive as well as preparation method and application thereof

Abstract

The invention provides a two-component modified epoxy resin adhesive and a preparation method and application thereof, the two-component modified epoxy resin adhesive comprises a resin component and a curing agent, the mass ratio of the resin component to the curing agent component is 1: 1, the resin component is prepared from the following components in percentage by mass: 5 to 10 weight percent of modified epoxy resin, 30 to 50 weight percent of epoxy resin, 5 to 20 weight percent of high-temperature-resistant modifier, 1 to 2 weight percent of coupling agent, 5 to 8 weight percent of diluent, 30 to 40 weight percent of filler and 0.5 to 1.5 weight percent of additive; the curing agent is prepared from the following components in percentage by mass: 60 to 80 weight percent of polyamide, 5 to 15 weight percent of modified alicyclic amine and 0 to 5 weight percent of styrene-butadiene copolymer; the modified bisphenol A epoxy resin is any one or a mixture of polyurethane modified epoxy resin, core-shell acrylic rubber modified epoxy resin or liquid nitrile rubber modified epoxy resin. The toughness of the adhesive at normal temperature is improved by introducing polyurethane, core-shell acrylic rubber and liquid nitrile rubber modified epoxy resin, and the toughness and strength at high temperature are improved by adding the high-temperature-resistant modifier into the system through prepolymerization reaction.

Description

Technical Field

[0001] The present invention relates to a two-component adhesive, and in particular to a two-component modified epoxy resin adhesive and a preparation method and application thereof. Background Art

[0002] Honeycomb panels are multi-layer composite panels composed of metal face sheets, aluminum / paper honeycomb cores, metal base sheets, and polymer adhesives. They offer numerous advantages, including light weight, high strength, high rigidity, and excellent sound and thermal insulation properties. They have been used in various civilian applications abroad since the 1960s and have developed rapidly. Honeycomb technology has only recently emerged in my country, where its application has been widely adopted in various civilian industrial sectors, having previously been limited to military applications. Aluminum honeycomb curtain walls, with their light weight, high strength, and high rigidity, have become widely used in high-rise building exterior decoration. A 15mm thick aluminum honeycomb panel with a 1.0mm thick face sheet and base sheet weighs only 6kg / ㎡. A honeycomb panel with the same rigidity weighs only one-fifth that of aluminum veneer and one-tenth that of steel. The interconnected aluminum honeycomb core acts like countless I-beams, with the core layers distributed and fixed throughout the panel, providing greater stability. Its wind resistance significantly exceeds that of aluminum plastic panels and aluminum veneer, and it is also less prone to deformation and maintains excellent flatness, even with large cell sizes. It can also achieve extremely high flatness, making it the lightweight material of choice in the construction industry. Honeycomb panels, with their numerous unique advantages, are widely used in various fields: building curtain wall panels; interior decoration projects, billboards; shipbuilding; aviation manufacturing; interior partitions and merchandise displays; commercial transport and container truck bodies; buses, trains, subways, and rail transit vehicles. For rail transit vehicles, which require particularly high safety requirements, aluminum honeycomb is often used for interior floors, roof panels, partitions, and walls. However, due to the special characteristics of rail transit vehicles, the vehicle bodies must withstand long-term dynamic loads, thus requiring higher strength.

[0003] Honeycomb panels are generally bonded with structural adhesives such as epoxy resin and polyurethane. However, due to the high strength and brittleness of traditional epoxy resin adhesives, the adhesive layer is easily broken during peeling, resulting in low peel strength. Furthermore, due to the high cross-linking density of epoxy resin adhesives, large shrinkage stress, and large differences in expansion coefficients between the adhesive and the metal sheet, debonding is prone to occur after testing under harsh conditions such as high and low temperature cycles, and the peel strength is severely reduced. Furthermore, due to the high cross-linking density and brittleness of epoxy resin, its impact strength is also relatively low. Honeycomb panels used in rail transit vehicles require the vehicle body to withstand long-term dynamic loads due to the special nature of rail transit vehicles. Therefore, epoxy resin adhesives must possess excellent shear strength and impact resistance. Therefore, existing epoxy resin adhesives limit their application in rail transit vehicles. Therefore, while maintaining the inherent strength and hardness of epoxy resin, it is important to significantly improve the shear strength and impact resistance of epoxy resin adhesives. Summary of the Invention

[0004] In response to the above technical problems, the present invention provides a two-component modified epoxy resin adhesive and its preparation method and application. The present invention introduces polyurethane, core-shell acrylic rubber, and liquid nitrile rubber to modify the epoxy resin to increase the toughness of the adhesive at room temperature. Through a prepolymerization reaction, a high-temperature resistant modifier is added to the system to solve the toughness and strength problems at high temperatures.

[0005] To achieve the above object, the technical solution of the present invention is: A two-component modified epoxy resin adhesive, comprising a resin component and a curing agent, wherein the mass ratio of the resin component to the curing agent component is 1:1, and the resin component comprises the following components, calculated by mass: 5-10 wt% modified bisphenol A epoxy resin, 30-50 wt% epoxy resin, 5-20 wt% high-temperature resistant epoxy resin, 1-2 wt% coupling agent, 5-8 wt% diluent, 30-40 wt% filler, and 0.5-1.5 wt% additive; The curing agent component comprises the following components calculated by mass: 60-80 wt% polyamide, 5-15 wt% modified alicyclic amine and 0-5 wt% styrene-butadiene copolymer; The modified bisphenol A epoxy resin is any one of polyurethane modified epoxy resin, core-shell acrylic rubber modified epoxy resin or liquid nitrile rubber modified epoxy resin or a mixture thereof.

[0006] Preferably, in order to better apply the two-component modified epoxy resin adhesive in rail transit vehicles, the molecular weight of the epoxy resin is 100-500Da, such as 100, 200, 300, 400, 500Da, and the molecular weight of the liquid nitrile rubber modified epoxy resin is 200-250KDa, such as 200, 300, 400, 500KDa.

[0007] Preferably, the high temperature resistant epoxy resin is a trifunctional glycidylamine epoxy resin, a tetrafunctional glycidylamine epoxy resin or a phenolic epoxy resin.

[0008] Preferably, the high temperature resistant epoxy resin is a tetrafunctional glycidylamine epoxy resin with the brand name Jeh-011.

[0009] Preferably, the content of the tetrafunctional glycidylamine epoxy resin with the brand Jeh-011 in the resin component is 15 wt %.

[0010] Preferably, the curing agent component includes 85 wt % of polyamide and 15 wt % of modified alicyclic amine.

[0011] Preferably, the diluent is a reactive diluent, and the reactive diluent is selected from any one of butyl glycidyl ether, phenyl glycidyl ether, benzyl glycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether or cyclohexyl dimethanol diglycidyl ether, or a mixture of any of them.

[0012] Preferably, the diluent is benzyl glycidyl ether XY692 and / or cyclohexyl dimethanol diglycidyl ether GE-22.

[0013] Preferably, the auxiliary agent includes a rheological agent and a defoaming agent.

[0014] Based on the same inventive concept, the present invention also provides a two-component modified epoxy resin adhesive, comprising the following steps: Preparation of resin components: Mix epoxy resin and modified epoxy resin according to the mass ratio, heat to 50-60℃, add coupling agent and diluent dropwise while stirring, add filler after 10-15 minutes, continue stirring for 25-35 minutes, and then continue stirring until the bubbles in the system are eliminated, discharge the material and set aside; Preparation of curing agent component: Mix polyamide and modified alicyclic amine according to the mass ratio, stir under vacuum at 50-60°C for 25-35 minutes, discharge and set aside.

[0015] Based on the same inventive concept, the present invention also provides an application of a two-component modified epoxy resin adhesive in aluminum honeycomb panels in the rail transit industry.

[0016] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art: This invention improves the epoxy resin adhesive's room-temperature shear strength, planar tensile strength, and 180° roller peel strength by adding a polyurethane-modified, core-shell polymer-modified, or liquid nitrile-modified epoxy resin to the epoxy resin adhesive, thereby increasing the adhesive's impact resistance. Furthermore, by adding a high-temperature-resistant epoxy resin, the adhesive's high-temperature (80°C) shear strength, planar tensile strength, and 180° roller peel strength are increased without affecting room-temperature performance. The curing agent comprises a latent curing system composed of a polyamide and an alicyclic amine, significantly improving high-temperature resistance while maintaining service life. The polyamide, with its flexible, long carbon chain, offsets the epoxy's rigidity, resulting in higher room-temperature shear and planar tensile strengths, as well as significantly improved 180° roller peel. The alicyclic amine, with its rigid six-membered ring, significantly improves high-temperature strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The effect of the amount of Jeh-011 added on the shear strength in Example 4; Figure 2The effect of the amount of Jeh-011 added on the plane tensile strength in Example 4; Figure 3 The effect of the amount of Jeh-011 added on the roller peel strength in Example 4; Figure 4 This is a shear strength test diagram of different curing agents in Example 5; Figure 5 This is a test diagram of the plane tensile strength of different curing agents in Example 5; Figure 6 This is a 180° roller peel strength test chart of different curing agents in Example 5. DETAILED DESCRIPTION

[0018] The present invention solves the problem of toughness at room temperature by introducing polyurethane, core-shell system and nitrile rubber synergistic toughening system into the resin component. Through prepolymerization reaction, a synergistic polyamide and alicyclic amine compound system is introduced into the curing agent component, thereby increasing the high temperature resistance of the epoxy resin glue without affecting the service life.

[0019] The following is a further detailed description of a two-component modified epoxy resin adhesive and its preparation method and application proposed by the present invention in conjunction with specific drawings and embodiments. The advantages and features of the present invention will become more apparent from the following description.

[0020] The following examples mainly describe a two-component modified epoxy resin adhesive for aluminum honeycomb panels used in rail transit applications, meeting the industry standard BOMBARDIER TRANSPORTATION SMP 221. Table 1 Test items according to SMP221 Example 1 Preparation of polyurethane modified epoxy resin: Table 2 Raw material formula and source of polyurethane modified epoxy resin According to the ratio in Table 2, polyether N210 and catalyst PC-12 were added to a four-necked flask. The mixture was heated and vacuum-dehydrated. A stoichiometric amount of toluene diisocyanate (TDI) was slowly added at about 80°C. The reaction was stopped after stirring for the required time to obtain an isocyanate-terminated PU prepolymer. A measured amount of bisphenol A epoxy resin was added and the mixture was cooled to room temperature to obtain the desired modified epoxy resin.

[0021] Table 3 Two-component modified epoxy resin adhesive raw material formula and source Preparation of two-component modified epoxy resin adhesive: Preparation of resin components: According to the ratio in Table 3, bisphenol A epoxy resin and polyurethane-modified epoxy resin were heated to 50-60°C. Coupling agent KH-560, reactive diluent, and rheological additive were added dropwise while stirring. After 15 minutes, filler was added and stirring was continued for 30 minutes. Then, vacuum was applied while stirring until bubbles in the system were eliminated. The material was discharged and set aside.

[0022] Preparation of curing agent component: weigh low molecular weight polyamide and alicyclic amine in a container, stir under vacuum at 50-60°C for 30 minutes, discharge and set aside.

[0023] Blank comparison ratio: According to the components in Table 3, without adding polyurethane-modified epoxy resin, a two-component epoxy resin adhesive without polyurethane-modified epoxy resin was prepared according to the above method.

[0024] The test results are shown in Table 4 according to the standard test method in Table 1. Table 4 Comparison of results between polyurethane modified epoxy adhesive and bisphenol A system From the test results in Table 4, we can see that polyurethane prepolymers were synthesized using polyether polyol and TDI as raw materials, and then grafted with epoxy resin to prepare grafted interpenetrating polymer networks using a synchronous method. The introduction of flexible urethane segments into the epoxy backbone effectively improved the material's ability to resist cracking, as evidenced by a significant increase in room temperature shear strength and roller peel strength. However, this also had a certain negative impact, namely, a decrease in the material's strength at high temperatures.

[0025] Example 2 Preparation of core-shell acrylic rubber modified epoxy resin: Table 5 Raw material formula and source of core-shell acrylic rubber modified epoxy resin Weigh bisphenol A epoxy resin NPEL-128 in a four-necked flask, heat to 85-90°C, and gradually add core-shell acrylic acid M-711 while stirring until the core-shell acrylic acid M-711 is dissolved and the system turns milky white, thereby obtaining a core-shell acrylic rubber modified epoxy resin.

[0026] Preparation of two-component modified epoxy resin adhesive: Table 6 Raw material formula and source of two-component modified epoxy resin adhesive Preparation of resin components: According to the ratio in Table 6, bisphenol A epoxy resin and core-shell acrylic rubber modified epoxy resin were heated to 50-60°C. Coupling agent KH-560, reactive diluent and rheological additive were added dropwise while stirring. After 15 minutes, filler was added and stirring was continued for 30 minutes. Then, vacuum was applied while stirring until bubbles in the system were eliminated. The material was discharged and set aside.

[0027] Preparation of curing agent component: weigh low molecular weight polyamide and alicyclic amine in a container, stir under vacuum at 50-60°C for 30 minutes, discharge and set aside.

[0028] Blank comparison ratio: According to the components in Table 6, without adding the core-shell acrylic rubber modified epoxy resin, a two-component epoxy resin adhesive without the core-shell acrylic rubber modified epoxy resin was prepared according to the above method.

[0029] The test results are shown in Table 7 according to the standard test method in Table 1. Table 7 Comparison of results between polyurethane modified epoxy adhesive and bisphenol A system The test results in Table 7 show significant improvements in both 25°C shear strength and 25°C in-plane tensile strength, both meeting design requirements. This is due to the uniform dispersion of the core-shell particles in the epoxy system. When an external force is applied, the generated energy first acts on the resin and then transfers along a path to the core-shell particles. These particles are very evenly dispersed in the resin matrix, forming a buffer zone that absorbs external forces. This effectively multiplies the external stress from the damage, as evidenced by the significant improvements in room-temperature shear strength and in-plane tensile strength. The 180° roller peel strength also improved, meeting the design value, for similar reasons to the shear strength improvement and will not be further elaborated. Because the core-shell particles are physically blended in the epoxy resin, they contribute little to the high-temperature strength.

[0030] Example 3 Preparation of liquid nitrile rubber modified epoxy resin: Table 8 Raw material formula and source of liquid nitrile rubber modified epoxy resin According to the ratio in Table 8, NPEL-128 and Hycar CTBN1300X16 were weighed in a four-necked flask and heated to 120-130°C. The catalyst triphenylphosphine was added while stirring. The reaction was continued for 1-2 hours until the system became a light reddish-brown transparent liquid to obtain a liquid nitrile rubber-modified epoxy resin.

[0031] Preparation of two-component modified epoxy resin adhesive: Table 9 Raw material formula and source of two-component modified epoxy resin adhesive Preparation of resin components: According to the ratio in Table 9, bisphenol A epoxy resin and liquid nitrile rubber modified epoxy resin were heated to 50-60°C. Coupling agent KH-560, reactive diluent and rheological additive were added dropwise while stirring. After 15 minutes, filler was added and stirring was continued for 30 minutes. Then, vacuum was applied while stirring until bubbles in the system were eliminated. The material was discharged and set aside.

[0032] Preparation of curing agent component: weigh low molecular weight polyamide and alicyclic amine in a container, stir under vacuum at 50-60°C for 30 minutes, discharge and set aside.

[0033] Blank comparison ratio: According to the components in Table 9, no liquid nitrile rubber modified epoxy resin was added, and a two-component epoxy resin adhesive containing no liquid nitrile rubber modified epoxy resin was prepared according to the above method.

[0034] The test results are shown in Table 10 according to the standard test method in Table 1. Table 10 Comparison of results between polyurethane modified epoxy adhesive and bisphenol A system Table 10 Test results of liquid nitrile rubber modified resin The test results in Table 10 show that the introduction of liquid rubber segments into the epoxy backbone creates an orderly embedding of these highly flexible, long carbon chains within the rigid bisphenol A epoxy segments, allowing the rigid segments to rotate and move more freely. During the curing process, a two-phase system is formed, with the epoxy resin as the continuous phase and the nitrile rubber as the dispersed phase, known as an "islands-in-the-sea structure," achieving significant toughening. Test data show a significant improvement in roller peeling. However, this approach significantly reduces the system's heat resistance due to the presence of a relatively large number of flexible rubber segments.

[0035] Example 4 From Examples 1-3, it can be concluded that by adding polyurethane modified, core-shell acrylic rubber modified and liquid nitrile rubber modified epoxy resin to improve the resin component, the room temperature flexibility index of the obtained adhesive has met the requirements, but the high temperature performance is still lacking to a certain extent. Four high temperature resistant resins are selected, see Table 11 for details.

[0036] Table 11 Types of high temperature resistant epoxy resins 1. Experimental part (1) Table 12 Raw material types and sources (3) Sample preparation Resin component preparation: Weigh a certain amount of bisphenol A epoxy resin, core-shell acrylic rubber-modified epoxy resin, and the high-temperature-resistant epoxy resin listed in Table 11 into a container. Heat to 50-60°C. Add KH-560 and reactive diluent dropwise while stirring. After 15 minutes, add filler and rheological additive. Continue stirring for 30 minutes. Then, evacuate the system while stirring until all bubbles are eliminated. Discharge the material and set aside.

[0037] Preparation of curing agent component: weigh low molecular weight polyamide and alicyclic amine in a container, stir under vacuum at 50-60°C for 30 minutes, discharge and set aside.

[0038] Combined with the curing agent components, performance tests were carried out according to Table 1. The results are shown in Table 13. Table 13 Test results of high temperature resistant epoxy system The following conclusions can be drawn from the above data: (1) For 25℃ shear strength, several multifunctional resins are at the same level and meet the design requirements; (2) For 80℃ shear strength, MY0510 and ERISYS GA-240 have the highest data, but the cost of raw materials is very high. MY720, AG-80, and Jeh-011 with similar chemical structures also have quite good performance and meet the design requirements. There are also domestically produced products with performance comparable to imported products; (3) For 25℃ planar tensile, ERISYS GA-240 and KDT-4400 achieve honeycomb core fracture, which is the best effect. MY720, AG-80, and Jeh-011 are also quite good; (4) For 80℃ planar tensile, MY720, AG-80, and Jeh-011 perform excellently; (5) For 180° roller peeling, several types of products are basically at the same level, and the increased crosslinking density does not have a negative effect on roller peeling strength. According to the above conclusions, Jeh-011 is the preferred high temperature resistant resin modifier.

[0039] Next, the shear strength, plane tensile strength and 180° roller peel strength were tested with different addition amounts of Jeh-011. The results are shown in the figure. Figure 1 、 Figure 2 、 Figure 3 .from Figure 1-3Test results show that because Jeh-011 is a tetraglycidylamine epoxy resin with high functionality, high activity, and strong adhesion, the cured product exhibits a high crosslink density, resulting in relatively concentrated internal stress during curing. Room temperature shear strength initially increases slowly, reaching a peak at 15 phr. Then, due to the increased crosslink density and system rigidity, the shear strength begins to decline. For room temperature planar tensile strength, due to differences in stress response and shear, the addition level is not yet at its maximum at 15 phr. A slight improvement at 20 phr is observed, but the increase is limited. 180° roller peel strength reaches its maximum at 15 phr and then slowly decreases. In summary, a Jeh-011 addition level of 15 phr is appropriate.

[0040] Example 5 Table 14 Raw material varieties and sources Sample preparation: Preparation of resin components: According to the ratio in Table 14, weigh bisphenol A epoxy resin, core-shell modified epoxy resin, and Jeh-011 high-temperature resistant epoxy resin. Heat to 50-60°C. Add KH-560 and reactive diluent dropwise while stirring. After 15 minutes, add filler and rheological additive. Continue stirring for 30 minutes. Then, evacuate the system while stirring until all bubbles in the system are eliminated. Discharge the material and set aside.

[0041] Preparation of curing agent component: According to the ratio in Table 14, weigh low molecular weight polyamide and styrene-butadiene copolymer, stir under vacuum at 50-60 °C for 30 mins, discharge and set aside.

[0042] Then, the curing agent component is prepared by the same method using aliphatic amine, alicyclic amine and aromatic amine instead of polyamide.

[0043] The prepared epoxy resin adhesive was systematically tested according to the standard test in Table 1. The test results are shown in Tables 15 and Figure 4-6 .

[0044] Table 15 Test data of different types of curing agents From Table 15 and Figure 4-6 It can be seen that (1) because polyamide has a long carbon chain, it plays an internal toughening role to a certain extent and can resist large external force damage, so the room temperature shear strength is high; (2) Due to their rigid six-membered rings and benzene rings, alicyclic amines and aromatic amines have high high-temperature performance; (3) For planar tensile strength, polyamide and alicyclic amine are better; In summary, the four curing agents exhibited their respective performance characteristics at room temperature and high temperature. Then, a system with low molecular weight polyamide as the main curing agent system and alicyclic amine as the auxiliary curing agent was selected. The raw material components are detailed in Table 16. They were tested according to the standards in Table 1, and the results are shown in Table 17.

[0045] Table 16 Raw material components of polyamide compounding system Table 17 Test results of polyamide compound system As can be seen from Table 17, the curing agent system combines the advantages of internal toughening of polyamide and heat resistance of alicyclic amine, and achieves satisfactory results.

[0046] Then, only the amount of alicyclic amine in the polyamide / alicyclic amine was changed to confirm the effect of the amount of alicyclic amine on the strength. The test results are shown in Table 18.

[0047] Table 18 Effect of alicyclic amine dosage on strength As can be seen from Table 18, in the curing agent system based on flexible polyamide, with the increase of the amount of alicyclic amine, various performance indicators gradually increase, and the comprehensive performance is best when the polyamide / alicyclic amine ratio is 85 / 15.

[0048] Example 6 According to the component ratio in Table 9 of Example 3, two diluents were used for strength comparison. Diluent XY692 and diluent GE-22 were used to prepare a two-component modified epoxy resin adhesive, and the strength test was carried out according to the test standard in Table 1. The results are shown in Table 19.

[0049] Table 19 Comparison of strength of different types of diluents As can be seen from Table 19, the monofunctional XY692 (i.e., benzyl glycidyl ether) acts like a chain terminator, acting as an internal toughening agent and making a significant contribution to room-temperature shear strength and roller peel strength. The difunctional GE-22 (i.e., cyclohexanediol glycidyl ether) has a rigid six-membered ring and can react with the epoxy resin and curing agent at both ends to form an organic whole, with almost no loss of high-temperature performance.

[0050] The mass ratio of the resin part to the curing agent in the above embodiment is 1:1.

[0051] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the scope of protection of the present invention.

Claims

1. A two-component modified epoxy resin adhesive, characterized in that: The invention comprises a resin component and a curing agent, wherein the mass ratio of the resin component to the curing agent component is 1:1, and the resin component comprises the following components by mass: 5-10wt% modified bisphenol A epoxy resin, 30-50wt% epoxy resin, 5-20wt% high temperature resistant epoxy resin, 1-2wt% coupling agent, 5-8wt% diluent, 30-40wt% filler, and 0.5-1.5wt% auxiliary agent; The curing agent component comprises the following components calculated by mass: 60-80 wt% polyamide, 5-15 wt% modified alicyclic amine and 0-5 wt% styrene-butadiene copolymer; The modified bisphenol A epoxy resin is any one of polyurethane modified epoxy resin, core-shell acrylic rubber modified epoxy resin or liquid nitrile rubber modified epoxy resin or a mixture thereof.

2. The two-component modified epoxy resin adhesive according to claim 1, characterized in that: The high temperature resistant epoxy resin is a trifunctional glycidylamine epoxy resin, a tetrafunctional glycidylamine epoxy resin or a phenolic epoxy resin.

3. The two-component modified epoxy resin adhesive according to claim 2, characterized in that: The high temperature resistant epoxy resin is a tetrafunctional glycidylamine epoxy resin with the brand name Jeh-011.

4. The two-component modified epoxy resin adhesive according to claim 3, characterized in that: The content of the tetrafunctional glycidylamine epoxy resin with the brand name Jeh-011 in the resin component is 15 wt %.

5. The two-component modified epoxy resin adhesive according to claim 1, characterized in that: The curing agent component includes 85 wt% of polyamide and 15 wt% of modified alicyclic amine.

6. The two-component modified epoxy resin adhesive according to claim 1, characterized in that: The diluent is a reactive diluent, and the reactive diluent is selected from any one of butyl glycidyl ether, phenyl glycidyl ether, benzyl glycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether or cyclohexyl dimethanol diglycidyl ether, or a mixture of any of them.

7. The two-component modified epoxy resin adhesive according to claim 6, characterized in that: The diluent is selected from benzyl glycidyl ether XY692 and / or cyclohexyl dimethanol diglycidyl ether GE-22.

8. The two-component modified epoxy resin adhesive according to claim 1, characterized in that: The auxiliary agents include rheological additives and defoaming agents.

9. A two-component modified epoxy resin adhesive, characterized in that: The following steps are involved: Preparation of resin components: Mix epoxy resin and modified epoxy resin according to the mass ratio, heat to 50-60℃, add coupling agent and diluent dropwise while stirring, add filler after 10-15 minutes, continue stirring for 25-35 minutes, and then continue stirring until the bubbles in the system are eliminated, discharge the material and set aside; Preparation of curing agent component: Mix polyamide and modified alicyclic amine according to the mass ratio, stir under vacuum at 50-60°C for 25-35 minutes, discharge and set aside.

10. Application of a two-component modified epoxy resin adhesive in aluminum honeycomb panels in the rail transit industry.

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