A hydrophilic two-component epoxy resin adhesive and a preparation method thereof

Abstract

The application discloses a kind of hydrophilic two-component epoxy resin adhesive and preparation method thereof, it is the mixture of component A and component B, by mass ratio, component A:component B is 1:(0.9-1.1);Wherein:component A includes epoxy resin and polyether amine, by mass ratio, epoxy resin:polyether amine=1:(0.05-1);Component B includes amine curing agent and accelerator, by mass ratio, amine curing agent:accelerator=(10-20):1;Preparation method is: preparation component A, preparation component B, component A and component B two components, by mass ratio 1:(0.9-1.1), are mixed, fully stirred until mixed uniformly, complete the preparation of hydrophilic two-component epoxy resin adhesive;The application can realize good interface compatibility of colloid and water molecules by using organic high molecular polyether amine to modify epoxy resin, so it has the characteristics of good compatibility with water, simple preparation process, simple synthesis raw material, energy saving and environmental protection.

Description

Technical Field

[0001] This invention belongs to the field of adhesive technology, specifically relating to a hydrophilic two-component epoxy resin adhesive and its preparation method. Background Technology

[0002] With the rapid development of society and economy, underground water supply and drainage systems are becoming increasingly complex, and the number of pipes used is also increasing. However, the maintenance and repair of urban water supply and drainage pipes remains one of the major challenges we face today.

[0003] To ensure successful bonding, the surfaces of the objects to be bonded must be clean and dry. In recent years, epoxy resin adhesives have been widely used in various fields of economic development and have great application potential in the repair of water supply and drainage pipelines. However, existing epoxy resin adhesives have poor water compatibility due to the lack of polar groups in the epoxy resin raw materials.

[0004] The invention patent application entitled "A Low-Viscosity, Hydrophilic Curable Epoxy Resin Stone Repair Adhesive and Its Preparation Method" (publication number CN112852368A) discloses a hydrophilic epoxy resin repair adhesive and its preparation method. The hydrophilic epoxy resin repair adhesive consists of two components, A and B. Specifically, component A is composed of bisphenol A type epoxy resin and / or diluted bisphenol A type epoxy resin, diluent, accelerator, and coupling agent. Component B consists of amine curing agent 1, amine curing agent 2, self-made modified alicyclic amine curing agent, and ethylene as a polymer monomer. The main feature of this invention is that the prepared epoxy resin repair adhesive has low viscosity and can be hydrophilically cured. However, due to the large number of reagents used, it has the disadvantages of redundant raw materials and complex preparation process. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide a hydrophilic two-component epoxy resin adhesive and its preparation method. By using organic polymer polyetheramine to hydrophilically modify epoxy resin, good interfacial compatibility between the colloid and water molecules can be achieved. It has the characteristics of good water compatibility, simple preparation process, simple raw materials, energy saving and environmental protection.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A hydrophilic two-component epoxy resin adhesive is a mixture of component A and component B, wherein the mass ratio of component A to component B is 1:(0.9-1.1); wherein: component A includes epoxy resin and polyetheramine, wherein the mass ratio of epoxy resin to polyetheramine is 1:(0.05-1); and component B includes amine curing agent and accelerator, wherein the mass ratio of amine curing agent to accelerator is (10-20):1.

[0008] The epoxy value of the epoxy resin is 0.2-0.9.

[0009] The epoxy resin is epoxy resin E51 or epoxy resin E54.

[0010] The polyetheramine is an organic polymer containing terminal amino functional groups, and is one of polyetheramine M1000, polyetheramine M2070, polyetheramine M3085 or polyetheramine T5000.

[0011] The amine curing agent is polyetheramine D230 or polyetheramine T403.

[0012] The accelerator is a tertiary amine or its salt accelerator, including one of triethylamine, triethanolamine, BMDA, DBU, DMP-10, pyridine, or DMP-30.

[0013] A method for preparing a hydrophilic two-component epoxy resin adhesive includes the following steps:

[0014] Step 1: Stir epoxy resin and methanol at 20-40℃ and 300-600 rpm for 1-4 hours to form a homogeneous epoxy resin methanol solution. Add polyetheramine dropwise to the epoxy resin methanol solution and stir for 24-48 hours at 20-40℃ and 300-600 rpm to obtain a modified epoxy resin methanol solution. The mass ratio of epoxy resin:methanol:polyetheramine is 1:(5-20):(0.05-1.00).

[0015] Step 2: Place the modified epoxy resin methanol solution prepared in Step 1 on a hot plate at a temperature of 45-75℃ until the methanol solvent is completely evaporated and the solution level no longer changes, thus obtaining the modified epoxy resin, which completes the preparation of component A.

[0016] Step 3: Mix the amine curing agent and accelerator at a temperature of 20-45℃ and a stirring rate of 300-600 rpm for 1-4 hours to complete the preparation of component B; by mass ratio, amine curing agent: accelerator = (10-20):1;

[0017] Step 4: Mix component A prepared in step 2 and component B prepared in step 3 at a mass ratio of 1:(0.9-1.1), and stir thoroughly until the mixture is homogeneous to complete the preparation of the hydrophilic two-component epoxy resin adhesive.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. The hydrophilic curable two-component epoxy resin adhesive prepared by this invention has good water compatibility due to the addition of hydrophilic organic polymer polyetheramine. Therefore, it can be used for the repair of structural engineering in various humid environments, with low cost and can improve the service life of various water supply and drainage pipes.

[0020] 2. The two-component epoxy resin adhesive of the present invention can be modified at room temperature, and the raw materials are simple and readily available, so the preparation process is simple. Since the reaction conditions in the preparation process are mild and the reactants are organic polymers, it is easy to produce in large quantities and use on a wide range of ground under normal pressure, with no waste emissions, and is energy-saving and environmentally friendly.

[0021] In summary, this invention utilizes organic polymer polyetheramine to hydrophilically modify epoxy resin, achieving good interfacial compatibility between the colloid and water molecules. Therefore, it features good water compatibility, simple preparation process, minimal raw materials, and energy saving and environmental protection. Attached Figure Description

[0022] Figure 1 This is a flowchart of the preparation method of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of epoxy resins E51 and E54 in this invention.

[0024] Figure 3 This is a schematic diagram of the structure of polyetheramines M2070 and M3085 in this invention.

[0025] Figure 4 This is a schematic diagram of the structure of polyetheramine D230, an amine curing agent in this invention.

[0026] Figure 5 This is a schematic diagram of the structure of the accelerator DMP-30 in this invention.

[0027] Figure 6 This is a schematic diagram of the structure of polyetheramine T403, an amine curing agent in this invention.

[0028] Figure 7 This is a schematic diagram of the structure of the accelerator DMP-10 in this invention.

[0029] Figure 8 This is a comparison diagram of the water contact angles of the hydrophilic two-component epoxy resin adhesives prepared in various embodiments of the present invention. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings.

[0031] Example 1

[0032] A hydrophilic two-component epoxy resin adhesive is a mixture of component A and component B, with a mass ratio of component A to component B of 1:0.9; it includes epoxy resin E51 and polyetheramine M2070, with a mass ratio of epoxy resin E51:polyetheramine M2070 = 1:0.05; component B includes accelerator DMP-30 and amine curing agent polyetheramine D230, with a mass ratio of amine curing agent polyetheramine D230:accelerator DMP-30 = 10:1.

[0033] See Figure 1 A method for preparing a hydrophilic two-component epoxy resin adhesive includes the following steps:

[0034] Step 1: Epoxy resin E51 and methanol are stirred at 20℃ and 300 rpm for 1 hour to form a homogeneous epoxy resin methanol solution. Polyetheramine M2070 is then added dropwise to this homogeneous epoxy resin methanol solution, and the reaction is continued at 20℃ and 300 rpm for 24 hours to obtain a modified epoxy resin methanol solution. The mass ratio of epoxy resin E51:methanol:polyetheramine M2070 is 1:5:0.05. See the schematic diagram of epoxy resin E51 for details. Figure 2 ; See the structural schematic diagram of polyetheramine M2070. Figure 3 ;

[0035] Step 2: Place the modified epoxy resin methanol solution prepared in Step 1 on a hot plate at a temperature of 45°C until the methanol solvent is completely evaporated and the solution level no longer changes. This yields the modified epoxy resin, thus completing the preparation of Component A.

[0036] Step 3: The amine curing agent polyetheramine D230 and the accelerator DMP-30 are stirred sequentially at 20℃ and 300 rpm for 1 hour to complete the preparation of component B. The mass ratio of amine curing agent polyetheramine D230 to accelerator DMP-30 is 10:1. See the structural schematic diagram of amine curing agent polyetheramine D230 for details. Figure 4 ; See the structural diagram of accelerator DMP-30. Figure 5 ;

[0037] Step 4: Mix component A prepared in step 2 and component B prepared in step 3 at a mass ratio of 1:0.9, and stir thoroughly until the mixture is homogeneous to complete the preparation of the hydrophilic two-component epoxy resin adhesive.

[0038] Example 2

[0039] A hydrophilic two-component epoxy resin adhesive is a mixture of component A and component B, with a mass ratio of component A to component B of 1:0.95. Component A is a self-made modified epoxy resin, comprising epoxy resin E51 and polyetheramine M2070, with a mass ratio of epoxy resin E51:polyetheramine M2070 = 1:0.2. Component B comprises amine curing agent polyetheramine D230 and accelerator DMP-30, with a mass ratio of amine curing agent polyetheramine D230:accelerator DMP-30 = 13:1.

[0040] A method for preparing a hydrophilic two-component epoxy resin adhesive includes the following steps:

[0041] Step 1: Epoxy resin E51 and methanol were stirred at 25℃ and 350 rpm for 2 hours to form a homogeneous epoxy resin methanol solution. Polyetheramine M2070 was then added dropwise to this homogeneous epoxy resin methanol solution, and the reaction was continued at 25℃ and 350 rpm for 24 hours to obtain a modified epoxy resin methanol solution. The mass ratio of epoxy resin E51:methanol:polyetheramine M2070 was 1:5:0.2. (See schematic diagram of epoxy resin E51 for details.) Figure 2 ; See the structural schematic diagram of polyetheramine M2070. Figure 3 ;

[0042] Step 2: Place the modified epoxy resin methanol solution prepared in Step 1 on a hot plate at a temperature of 50°C until the methanol solvent is completely evaporated and the solution level no longer changes, thus obtaining the modified epoxy resin, which completes the preparation of component A.

[0043] Step 2: The amine curing agent polyetheramine D230 and the accelerator DMP-30 are stirred sequentially at 25℃ and 350 rpm for 2 hours to complete the preparation of component B. The mass ratio of amine curing agent polyetheramine D230 to accelerator DMP-30 is 13:1. See the structural schematic diagram of amine curing agent polyetheramine D230 for details. Figure 4 ; See the structural diagram of accelerator DMP-30. Figure 5 ;

[0044] Step 4: Mix component A prepared in Step 2 and component B prepared in Step 3 at a mass ratio of 1:0.95, and stir thoroughly until the mixture is homogeneous to complete the preparation of the hydrophilic two-component epoxy resin adhesive.

[0045] Example 3

[0046] A hydrophilic two-component epoxy resin adhesive is a mixture of component A and component B, with a mass ratio of component A to component B of 1:1; wherein: component A includes epoxy resin E51 and polyetheramine M2070, with a mass ratio of epoxy resin E51:polyetheramine M2070 = 1:0.25; component B includes accelerator DMP-30 and amine curing agent polyetheramine D230, with a mass ratio of amine curing agent polyetheramine D230:accelerator DMP-30 = 11.67:1.

[0047] A method for preparing a hydrophilic two-component epoxy resin adhesive includes the following steps:

[0048] Step 1: Epoxy resin E51 and methanol are stirred at 30℃ and 400 rpm for 3 hours to form a homogeneous epoxy resin methanol solution. Polyetheramine M2070 is then added dropwise, and the reaction is continued at 30℃ and 400 rpm for 24 hours to obtain a modified epoxy resin methanol solution. The mass ratio of epoxy resin E51:methanol:polyetheramine M2070 is 1:10:0.25. See the schematic diagram of epoxy resin E51 for details. Figure 2 ; See the structural schematic diagram of polyetheramine M2070. Figure 6 ;

[0049] Step 2: Place the modified epoxy resin methanol solution prepared in Step 1 on a hot plate at a temperature of 50°C until the methanol solvent is completely evaporated and the solution level no longer changes, thus obtaining the modified epoxy resin, which completes the preparation of component A.

[0050] Step 3: The amine curing agent polyetheramine D230 and the accelerator DMP-30 are stirred sequentially at 30℃ and 400 rpm for 3 hours to complete the preparation of component B. The mass ratio of amine curing agent polyetheramine D230 to accelerator DMP-30 is 11.67:1. See the structural diagram of amine curing agent polyetheramine D230 for details. Figure 4 ; See the structural diagram of accelerator DMP-30. Figure 5 ;

[0051] Step 4: Mix component A prepared in step 2 and component B prepared in step 3 at a mass ratio of 1:1, and stir thoroughly until the mixture is homogeneous to complete the preparation of the hydrophilic two-component epoxy resin adhesive.

[0052] Example 4

[0053] A hydrophilic two-component epoxy resin adhesive is a mixture of component A and component B, with a mass ratio of component A to component B of 1:1.05; wherein: component A includes epoxy resin E54 and polyetheramine M3085, with a mass ratio of epoxy resin E54:polyetheramine M3085 = 1:0.5; component B includes amine curing agent polyetheramine D230 and accelerator DMP-10, with a mass ratio of amine curing agent polyetheramine D230:accelerator DMP-10 = 15:1.

[0054] A method for preparing a hydrophilic two-component epoxy resin adhesive includes the following steps:

[0055] Step 1: Epoxy resin E54 and methanol are stirred at 35℃ and 450 rpm for 3 hours to form a homogeneous epoxy resin methanol solution. Polyetheramine M3085 is then added dropwise to this homogeneous epoxy resin methanol solution, and the reaction is continued at 35℃ and 450 rpm for 24 hours to obtain a modified epoxy resin methanol solution. The mass ratio of epoxy resin E54:methanol:polyetheramine M3085 is 1:10:0.5. See the schematic diagram of epoxy resin E54 for details. Figure 2 ; See the structural schematic diagram of polyetheramine M3085. Figure 3 ;

[0056] Step 2: Place the modified epoxy resin methanol solution prepared in Step 1 on a hot plate at a temperature of 60°C until the methanol solvent is completely evaporated and the solution level no longer changes, thus obtaining the modified epoxy resin, which completes the preparation of component A.

[0057] Step 3: Sequentially add the amine curing agent polyetheramine D230 and the accelerator DMP-10, and stir at 35℃ and 450 rpm for 3 hours to complete the preparation of component B; the mass ratio of amine curing agent polyetheramine D230 to accelerator DMP-10 is 15:1; see the structural schematic diagram of amine curing agent polyetheramine D230 for details. Figure 4 ; See the structural diagram of accelerator DMP-10. Figure 7 ;

[0058] Step 4: Mix component A prepared in Step 2 and component B prepared in Step 3 at a mass ratio of 1:1.05, and stir thoroughly until the mixture is homogeneous to complete the preparation of the hydrophilic two-component epoxy resin adhesive.

[0059] Example 5

[0060] A hydrophilic two-component epoxy resin adhesive is a mixture of component A and component B, with a mass ratio of component A to component B of 1:1.08. Component A includes epoxy resin E54 and polyetheramine M3085, with a mass ratio of epoxy resin E54:polyetheramine M3085 = 1:0.75. Component B includes amine curing agent polyetheramine D230 and accelerator DMP-10, with a mass ratio of amine curing agent polyetheramine D230:accelerator DMP-10 = 14:1.

[0061] A method for preparing a hydrophilic two-component epoxy resin adhesive includes the following steps:

[0062] Step 1: Epoxy resin E51 and methanol are stirred at 40℃ and 500 rpm for 3 hours to form a homogeneous epoxy resin methanol solution. Polyetheramine M2070 is then added dropwise to this homogeneous epoxy resin methanol solution, and the reaction is continued at 40℃ and 500 rpm for 24 hours to obtain a modified epoxy resin methanol solution. The mass ratio of epoxy resin E51:methanol:polyetheramine M2070 is 1:12:0.75. See the schematic diagram of epoxy resin E51 for details. Figure 2 ; See the structural schematic diagram of polyetheramine M2070. Figure 3 ;

[0063] Step 2: Place the modified epoxy resin methanol solution prepared in Step 1 on a hot plate at a temperature of 60°C until the methanol solvent is completely evaporated and the solution level no longer changes, thus obtaining the modified epoxy resin, which completes the preparation of component A.

[0064] Step 3: Sequentially mix the amine curing agent polyetheramine D230 and the accelerator DMP-30 at 40℃ and a stirring rate of 500 rpm for 3 hours to complete the preparation of component B; the mass ratio of amine curing agent polyetheramine D230 to accelerator DMP-30 is 14:1; see the structural schematic diagram of amine curing agent polyetheramine D230 for details. Figure 4 ; See the structural diagram of accelerator DMP-30. Figure 5 ;

[0065] Step 4: Mix component A prepared in step 2 and component B prepared in step 3 at a mass ratio of 1:1.08, and stir thoroughly until the mixture is homogeneous to complete the preparation of the hydrophilic two-component epoxy resin adhesive.

[0066] Example 6

[0067] A hydrophilic two-component epoxy resin adhesive is a mixture of component A and component B, with a mass ratio of component A to component B of 1:1.1. Component A comprises epoxy resin E51 and polyetheramine M1000, M3085, or T5000, with a mass ratio of epoxy resin E51: polyetheramine M1000, M3085, or T5000 of 1:0.75. Component B comprises an amine curing agent, polyetheramine T403, and an accelerator, triethylamine, triethanolamine, BMDA, DBU, or pyridine, with a mass ratio of amine curing agent, polyetheramine T403, to accelerator, triethylamine, triethanolamine, BMDA, DBU, or pyridine of 20:1.

[0068] A method for preparing a hydrophilic two-component epoxy resin adhesive includes the following steps:

[0069] Step 1: Epoxy resin E51 and methanol are stirred at 45℃ and 550 rpm for 4 hours to form a homogeneous epoxy resin methanol solution. Polyetheramine M2070 is then added dropwise, and the reaction is continued at 45℃ and 550 rpm for 48 hours to obtain a modified epoxy resin methanol solution. The mass ratio of epoxy resin E51:methanol:polyetheramine M1000 or polyetheramine M3085 or polyetheramine T5000 is 1:13.33:0.75. See the schematic diagram of epoxy resin E51. Figure 2 ; See the structural schematic diagram of polyetheramine M2070. Figure 3 ;

[0070] Step 2: Place the modified epoxy resin methanol solution prepared in Step 1 on a hot plate at a temperature of 70°C until the methanol solvent is completely evaporated and the solution level no longer changes, thus obtaining the modified epoxy resin.

[0071] Step 3: Sequentially mix the amine curing agent polyetheramine T403 with triethylamine or triethanolamine or BMDA or DBU or pyridine at 45℃ and a stirring rate of 550 rpm for 4 hours to obtain epoxy resin component B; the mass ratio of amine curing agent polyetheramine T403 to accelerator triethylamine or triethanolamine or BMDA or DBU or pyridine is 20:1; see the structural diagram of amine curing agent T403. Figure 6 ; See the structural diagram of accelerator DMP-30. Figure 5 ;

[0072] Step 4: Mix component A prepared in Step 2 and component B prepared in Step 3 at a mass ratio of 1:1.1, and stir thoroughly until the mixture is homogeneous to complete the preparation of the hydrophilic two-component epoxy resin adhesive.

[0073] See Figure 8Comparing Examples 1 to 6, it can be seen that as the amount of polyetheramine added increases from 4.76% to 42.86%, the water contact angle of the epoxy resin adhesive decreases from 76.10° to 25.49°. Compared with the water contact angle of 80.64° of the unmodified epoxy resin adhesive, the water contact angle is significantly reduced, indicating that the two-component epoxy resin adhesive prepared by the present invention has excellent hydrophilicity.

[0074] In summary, this invention proposes a simple and universally applicable two-component hydrophilic curing epoxy resin adhesive, which shows promise for applications such as urban water supply and drainage pipeline repair and for repairing various structural buildings in humid environments.

[0075] In the above embodiments, epoxy resin E51, epoxy resin E54, and methanol (CH3OH, ≥99.9%) were purchased from Maclean Biochemical Technology Co., Ltd., amine curing agent polyetheramine D230, amine curing agent T403 and accelerator DMP-30, and accelerator DMP-10 were purchased from Suzhou Changke Industrial Co., Ltd., and organic polymer polyetheramine M2070 and polyetheramine M3085 were purchased from Guangzhou Hengyu Trading Co., Ltd.

[0076] In summary, this invention effectively reduces the complexity and cumbersomeness of two-component hydrophilic curing epoxy resin adhesives.

Claims

1. A hydrophilic two-component epoxy resin adhesive, characterized in that, It is a mixture of component A and component B, with a mass ratio of component A to component B of 1:(0.9-1.1); wherein: component A includes epoxy resin and polyetheramine, with a mass ratio of epoxy resin to polyetheramine of 1:(0.05-1); component B includes amine curing agent and accelerator, with a mass ratio of amine curing agent to accelerator of (10-20):1; The polyetheramine is an organic polymer containing terminal amino functional groups, and is one of polyetheramine M1000, polyetheramine M2070 or polyetheramine M3085. The preparation method of the hydrophilic two-component epoxy resin adhesive includes the following steps: Step 1: Stir epoxy resin and methanol at 20-40℃ and 300-600 rpm for 1-4 hours to form a homogeneous epoxy resin methanol solution. Add polyetheramine dropwise to the epoxy resin methanol solution and stir for 24-48 hours at 20-40℃ and 300-600 rpm to obtain a modified epoxy resin methanol solution. The mass ratio of epoxy resin:methanol:polyetheramine is 1:(5-20):(0.05-1.00). Step 2: Place the modified epoxy resin methanol solution prepared in Step 1 on a hot plate at a temperature of 45-75℃ until the methanol solvent is completely evaporated and the solution level no longer changes, thus obtaining the modified epoxy resin, which completes the preparation of component A. Step 3: Mix the amine curing agent and accelerator at a temperature of 20-45℃ and a stirring rate of 300-600 rpm for 1-4 hours to complete the preparation of component B; by mass ratio, amine curing agent: accelerator = (10-20):1; Step 4: Mix component A prepared in step 2 and component B prepared in step 3 at a mass ratio of 1:(0.9-1.1), and stir thoroughly until the mixture is homogeneous to complete the preparation of the hydrophilic two-component epoxy resin adhesive.

2. The hydrophilic two-component epoxy resin adhesive according to claim 1, characterized in that, The epoxy value of the epoxy resin is 0.2-0.

9.

3. A hydrophilic two-component epoxy resin adhesive according to claim 1 or 2, characterized in that, The epoxy resin is epoxy resin E51 or epoxy resin E54.

4. The hydrophilic two-component epoxy resin adhesive according to claim 1, characterized in that, The amine curing agent is polyetheramine D230 or polyetheramine T403.

5. The hydrophilic two-component epoxy resin adhesive according to claim 1, characterized in that, The accelerator is a tertiary amine or its salt accelerator, including one of triethylamine, triethanolamine, BMDA, DBU, DMP-10, pyridine, or DMP-30.

6. The hydrophilic two-component epoxy resin adhesive according to claim 1, characterized in that, The preparation method of the hydrophilic two-component epoxy resin adhesive includes the following steps: Step 1: Epoxy resin E51 and methanol are stirred at 40℃ and 500 rpm for 3 hours to form a homogeneous epoxy resin methanol solution. Polyetheramine M2070 is then added dropwise to the homogeneous epoxy resin methanol solution, and the reaction is carried out at 40℃ and 500 rpm for 24 hours to obtain a modified epoxy resin methanol solution. The mass ratio of epoxy resin E51:methanol:polyetheramine M2070 is 1:12:0.

75. Step 2: Place the modified epoxy resin methanol solution prepared in Step 1 on a hot plate at a temperature of 60°C until the methanol solvent is completely evaporated and the solution level no longer changes, thus obtaining the modified epoxy resin, which completes the preparation of component A. Step 3: The amine curing agent polyetheramine D230 and the accelerator DMP-30 are stirred sequentially at 40℃ and 500 rpm for 3 hours to complete the preparation of component B; the mass ratio of amine curing agent polyetheramine D230 to accelerator DMP-30 is 14:

1. Step 4: Mix component A prepared in step 2 and component B prepared in step 3 at a mass ratio of 1:1.08, and stir thoroughly until the mixture is homogeneous to complete the preparation of the hydrophilic two-component epoxy resin adhesive.

7. A hydrophilic two-component epoxy resin adhesive, characterized in that, This is a mixture of components A and B, with a mass ratio of 1:1.

08. Component A includes epoxy resin E51 and polyetheramine M2070, with a mass ratio of 1:0.

75. Component B includes amine curing agent polyetheramine D230 and accelerator DMP-30, with a mass ratio of 14:1.

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