Epoxy adhesive for assembling bridge sections in marine environment and preparation method of epoxy adhesive
By combining hydrophobic molecular design with dense physical structure and interfacial chemical bonding, the problem of poor durability of epoxy adhesives in marine environments has been solved, thus improving the long-term stability and durability of bridge connections.
Patent Information
- Application Number
- CN202511955982.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-23
- Publication Date
- 2026-02-10
AI Technical Summary
Existing epoxy adhesives have poor durability in marine environments with high temperature, high humidity, and high salt spray, leading to bonding failure at the concrete interface and affecting the durability and safety of bridges.
By employing a method combining molecular hydrophobic design, dense physical structure, and interfacial chemical bonding, a hydrophobic, dense, and chemically bonded epoxy adhesive is formed using components such as hydrogenated bisphenol A epoxy resin, C12-C14 alkyl glycidyl ether, active silica powder of different grades, and coupling agents.
It significantly improves the durability of epoxy adhesives in high temperature, high humidity, and high salt spray environments, ensuring the long-term stability and water resistance of bridge connections, and resisting the damage of heat, oxygen, and moisture.
Smart Images
Figure CN121495501A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of special building engineering materials, in particular to an epoxy adhesive for marine environment bridge segment assembly and a preparation method thereof. BACKGROUND
[0002] With the development of bridge construction in coastal areas, the concrete segment glue splicing process is widely used due to its high efficiency and controllable quality. The concrete-to-concrete joint is the key part of segment connection and is also a weak part, which is usually connected by using an epoxy adhesive to transfer stress, seal against seepage, and lubricate positioning.
[0003] However, the near-sea bridge is in a harsh marine environment, which has two significant characteristics: first, a high-humidity and high-temperature environment. There is moisture in the interior and surface of the concrete substrate, which can seriously weaken the interfacial adhesion between the epoxy adhesive and the concrete, resulting in adhesion failure. In addition, long-term humid and hot environment can accelerate the hydrolysis, plasticization and chemical structure degradation of epoxy resin, leading to a significant decrease in the mechanical properties of the adhesive layer; second, a high-salt fog environment. Chloride ions penetrate through the epoxy adhesive joint with water vapor, which can catalyze the hydrolysis of the adhesive layer-concrete interface bond, leading to adhesion performance degradation; and can penetrate into the interior to cause electrochemical corrosion of the prestressed tendon, ultimately causing adhesive layer peeling and permanent decrease in structural bearing capacity, which seriously threatens the durability and safety of the bridge. SUMMARY
[0004] The present application provides an epoxy adhesive for marine environment bridge segment assembly and a preparation method thereof, which fundamentally improves its durability in high-temperature and high-humidity, high-salt fog environments through the synergistic effect of molecular hydrophobic design, physical structure dense filling and interface chemical bonding, and provides a reliable connection material guarantee for near-sea and cross-sea bridge engineering.
[0005] In a first aspect, the present application provides an epoxy adhesive for marine environment bridge segment assembly, which comprises A component and B component, and the mass ratio of A component to B component is (2-4):1, wherein: According to the mass fraction, the A component comprises: 80-90 parts of epoxy resin, 10-20 parts of modified epoxy resin, 10-15 parts of active diluent, 4-8 parts of thixotropic agent, 1-3 parts of coupling agent, 0.3-0.5 parts of defoaming agent, 0.1-0.2 parts of ultraviolet absorber, and 200-250 parts of filler; the epoxy resin comprises bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin and bisphenol F type epoxy resin, and the active diluent is C12-C14 alkyl glycidyl ether; According to the mass fraction, the B component comprises: 80-100 parts of modified amine curing agent, 3-5 parts of thixotropic agent, and 200-250 parts of filler, wherein the filler is compounded by active silica micropowder with different gradations.
[0006] In conjunction with the first aspect, in one embodiment, the mass ratio of bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin and bisphenol F type epoxy resin is 1:(1-1.5):(0.2-0.4).
[0007] In conjunction with the first aspect, in one embodiment, the modified epoxy resin includes one or more of liquid nitrile rubber modified epoxy resin and polyurethane modified epoxy resin.
[0008] In conjunction with the first aspect, in one embodiment, the thixotropic agent is hydrophobic fumed silica; And / or, the coupling agent includes one or more of silane coupling agents KH-550, KH-560, and KH-570; And / or, the defoamer is a modified polysiloxane defoamer; And / or, the ultraviolet absorber is a benzotriazole ultraviolet absorber; And / or, the filler comprises 200-mesh activated silica powder, 400-mesh activated silica powder and 1250-mesh activated silica powder, wherein the mass ratio of 200-mesh activated silica powder, 400-mesh activated silica powder and 1250-mesh activated silica powder is 1:(1~1.5):(0.2~0.8).
[0009] In conjunction with the first aspect, in one embodiment, the modified amine curing agent comprises a pre-promoted modified alicyclic amine and a low-activity modified fatty amine, in a mass ratio of (3-4):1.
[0010] In conjunction with the first aspect, in one embodiment, the pre-promoted modified alicyclic amine is an alicyclic amine incorporating phenol or alkylphenol, and the alicyclic amine is isophorone diamine or methylcyclohexane diamine.
[0011] In conjunction with the first aspect, in one embodiment, the low-activity modified fatty amine is a product obtained by ring-opening addition of a fatty amine to an epoxide, wherein the fatty amine is a polyether diamine and the epoxide is a phenyl glycidyl ether.
[0012] Secondly, embodiments of this application provide a method for preparing an epoxy adhesive for assembling bridge segments in a marine environment as described above, comprising: Mix component A and component B at a mass ratio of (2-4):1, stir until homogeneous, and it is ready.
[0013] In conjunction with the second aspect, in one embodiment, the preparation steps of component A include: Premixing: Add epoxy resin, modified epoxy resin, reactive diluent and ultraviolet absorber into the reactor, and stir at 300-500 rpm for 20-30 minutes at a temperature of 50±5℃ until all liquid components are mixed evenly, the ultraviolet absorber is completely dissolved and the system is transparent. Dispersion: Add coupling agent, thixotropic agent and filler in sequence, and disperse at high speed of 800-1200 rpm for 40-60 minutes. Discharge: Add defoamer, stir at 300-500 rpm for 5-10 minutes, then remove bubbles under a vacuum of -0.095 MPa to -0.1 MPa for 15-20 minutes. After releasing the vacuum, discharge the material and seal it in packaging.
[0014] In conjunction with the second aspect, in one embodiment, the preparation steps of component B include: Premixing: Add the modified amine curing agent to the mixing tank; Dispersion: Add thixotropic agent and filler to the stirred tank and vacuum stir at 600-800 rpm for 30-45 minutes until all components are mixed evenly; Discharge: Discharge the material and seal it for packaging.
[0015] The beneficial effects of the technical solution provided in this application include: The epoxy adhesive provided in this application fundamentally improves its durability in high temperature, high humidity, and high salt spray environments through the synergistic effect of molecular hydrophobic design, dense physical structure filling, and interfacial chemical bonding, providing a reliable connection material guarantee for near-shore and cross-sea bridge projects.
[0016] Specifically, hydrogenated bisphenol A epoxy resin and C12-C14 long-chain alkyl glycidyl ether are used to enhance the hydrophobicity of the colloid at the molecular level; different grades of active silica powder form a dense packing, increasing the density of the colloid. Simultaneously, the coupling agent forms strong chemical bonds at the damp concrete interface, resisting the erosion and desorption of water molecules on the bonding interface, ensuring long-term bonding stability, thereby achieving strong water resistance and impermeability.
[0017] Hydrogenated bisphenol A epoxy resin, with its alicyclic structure, exhibits superior hydrolysis resistance compared to ordinary bisphenol A epoxy resins. It is less prone to main chain breakage under humid and hot conditions, and its UV absorber effectively resists UV degradation. The hydrophobic and dense overall structure of this application, combined with functional additives, forms a synergistic anti-aging system that jointly resists the combined damage from heat, oxygen, and moisture, thereby achieving excellent resistance to humid and hot aging. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 A flowchart illustrating the preparation method of the epoxy adhesive for assembling bridge segments in a marine environment, as provided in this application embodiment. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0021] Developing an epoxy adhesive that can adapt to the harsh marine environment, possesses excellent adhesion to damp concrete interfaces, and exhibits extremely low chloride ion permeability and superior long-term resistance to damp heat aging has become a key technical problem that urgently needs to be solved to ensure the long-term safe service of cross-sea bridges.
[0022] This application provides an epoxy adhesive for assembling bridge segments in a marine environment, comprising component A and component B, wherein the mass ratio of component A to component B is (2-4):1, wherein: Based on parts by weight, component A comprises: 80-90 parts epoxy resin, 10-20 parts modified epoxy resin, 10-15 parts reactive diluent, 4-8 parts thixotropic agent, 1-3 parts coupling agent, 0.3-0.5 parts defoamer, 0.1-0.2 parts ultraviolet absorber, and 200-250 parts filler; the epoxy resin includes bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin, and bisphenol F type epoxy resin, and the reactive diluent is C12-C14 alkyl glycidyl ether; According to the mass fraction, component B includes: 80-100 parts of modified amine curing agent, 3-5 parts of thixotropic agent, and 200-250 parts of filler, wherein the filler is composed of activated silica powder with different gradations.
[0023] The epoxy adhesive provided in this application fundamentally improves its durability in high temperature, high humidity, and high salt spray environments through the synergistic effect of molecular hydrophobic design, dense physical structure filling, and interfacial chemical bonding, providing a reliable connection material guarantee for near-shore and cross-sea bridge projects.
[0024] Specifically, hydrogenated bisphenol A epoxy resin and C12-C14 long-chain alkyl glycidyl ether are used to enhance the hydrophobicity of the colloid at the molecular level; different grades of active silica powder form a dense packing, increasing the density of the colloid. Simultaneously, the coupling agent forms strong chemical bonds at the damp concrete interface, resisting the erosion and desorption of water molecules on the bonding interface, ensuring long-term bonding stability, thereby achieving strong water resistance and impermeability.
[0025] Hydrogenated bisphenol A epoxy resin, with its alicyclic structure, exhibits superior hydrolysis resistance compared to ordinary bisphenol A epoxy resins. It is less prone to main chain breakage under humid and hot conditions, and its UV absorber effectively resists UV degradation. The hydrophobic and dense overall structure of this application, combined with functional additives, forms a synergistic anti-aging system that jointly resists the combined damage from heat, oxygen, and moisture, thereby achieving excellent resistance to humid and hot aging.
[0026] In some preferred embodiments, the mass ratio of bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin and bisphenol F type epoxy resin is 1:(1-1.5):(0.2-0.4).
[0027] In some preferred embodiments, the modified epoxy resin is a liquid nitrile rubber modified epoxy resin or a polyurethane modified epoxy resin. For example, as an example, the polyurethane modified epoxy resin can be a toughened modified epoxy resin from Beijing Jindaoqishi Materials Technology Co., Ltd., such as QS-P24F and QS-P28E; the liquid nitrile rubber modified epoxy resin can be ETBN from Beijing Jindaoqishi Materials Technology Co., Ltd., etc.
[0028] In some preferred embodiments, the thixotropic agent is hydrophobic fumed silica.
[0029] The coupling agent includes one or more of silane coupling agents KH-550, KH-560, and KH-570.
[0030] In some preferred embodiments, the defoamer is a modified polysiloxane defoamer. For example, BYK-A 530 (BYK Chemical), BYK-A 555 (BYK Chemical), and TEGO Airex 930 (Evonik Industries) can be used.
[0031] In some preferred embodiments, the ultraviolet absorber is a benzotriazole ultraviolet absorber, such as BASF Tinuvin 328.
[0032] In some preferred embodiments, the filler comprises 200-mesh activated silica powder, 400-mesh activated silica powder and 1250-mesh activated silica powder, and the mass ratio of 200-mesh activated silica powder, 400-mesh activated silica powder and 1250-mesh activated silica powder is 1:(1~1.5):(0.2~0.8).
[0033] The activated silica powder is obtained using a dry process, specifically including: Preheating and mixing: Add ordinary silicon micro powder to a high-speed heating mixer and heat to 105-120°C. Maintain the temperature and stir for 20-40 minutes. Dry thoroughly under stirring to remove free moisture, so that the final moisture content of the powder is less than 0.5%.
[0034] Spray reaction: Take 0.5% to 2% of the silane coupling agent by mass of silicon micro powder, dilute it with 1 to 3 times the mass of the silane coupling agent in an inert solvent such as anhydrous ethanol, and spray it evenly onto the powder through an atomizing nozzle. Disperse and react at high speed at 800 to 1200 r / min under high temperature of 105 to 120 ℃.
[0035] Maturation: Maintain the temperature and continue stirring for 20-60 minutes to ensure complete reaction and obtain active silica micro powder.
[0036] In some preferred embodiments, the modified amine curing agent comprises a pre-promoted modified alicyclic amine and a low-activity modified fatty amine, in a mass ratio of (3-4):1.
[0037] In some preferred embodiments, the pre-accelerated modified alicyclic amine is an alicyclic amine incorporating phenol or alkylphenol, specifically isophorone diamine or methylcyclohexane diamine. The phenol or alkylphenol (such as nonylphenol) structure is introduced into the alicyclic amine via the Mannich reaction to provide catalytic activity, thus synthesizing a pre-accelerated amine curing agent. For example, PZ-K1 or QS-J005(H) from Langfang Jindaoqishi Adhesive Co., Ltd. can be directly purchased.
[0038] In some preferred embodiments, the low-activity modified aliphatic amine is a product obtained by ring-opening addition of an epoxide to aliphatic amine, converting a highly active primary amine into a less active secondary amine, thus synthesizing a flexible curing agent containing a secondary amine and hydroxyl groups, which has lower activity and a longer pot life. The aliphatic amine is a polyether diamine, and the epoxide is phenyl glycidyl ether. For example, PZ-MK1 or QS-J005(L) from Langfang Jindaoqishi Adhesive Co., Ltd. can be directly purchased.
[0039] A blend of pre-accelerated modified alicyclic amines and low-activity modified aliphatic amines balances the conflict between low-temperature curing activity and long pot life. Liquid nitrile rubber-modified epoxy resin or polyurethane-modified epoxy resin acts as a toughening phase, working in conjunction with rigid epoxy resin to ensure the adhesive layer possesses both high strength and high modulus to transfer loads, while also having sufficient toughness to prevent brittle cracking. Thixotropy is controlled by hydrophobic fumed silica, ensuring the adhesive does not drip on vertical or ceiling surfaces, thus giving the epoxy adhesive both mechanical and workability.
[0040] See Figure 1 As shown in the embodiments of this application, a method for preparing an epoxy adhesive for assembling bridge segments in a marine environment is also provided, which includes the following steps: Mix component A and component B at a mass ratio of (2-4):1, stir well, and then apply the coating.
[0041] The preparation steps of component A include: Premixing: Add epoxy resin, modified epoxy resin, reactive diluent and ultraviolet absorber into the reactor, and stir at 300-500 rpm for 20-30 minutes at a temperature of 50±5℃ until all liquid components are mixed evenly, the ultraviolet absorber is completely dissolved and the system is transparent. Dispersion: Add coupling agent, thixotropic agent and filler in sequence, and disperse at high speed of 800-1200 rpm for 40-60 minutes to ensure that the filler is fully wetted and there are no agglomerated particles in the system; Discharge: Add defoamer, stir at 300-500 rpm for 5-10 minutes, then turn on the vacuum system and remove bubbles for 15-20 minutes at a vacuum of -0.095 MPa to -0.1 MPa. After releasing the vacuum, discharge the material, seal and package it to obtain component A.
[0042] The preparation steps of component B include: Premixing: Add the modified amine curing agent to the mixing tank; Dispersion: Add thixotropic agent and filler to the mixing tank and vacuum stir at 600-800 rpm for 30-45 minutes until all components are mixed evenly and the system has uniform color and texture; Discharge: Discharge the material, seal it in packaging to prevent the absorption of moisture from the air, and obtain component B.
[0043] The present application will be described in detail below through some embodiments.
[0044] Example 1: A:B = 3:1 Component A: 30 parts of bisphenol A type epoxy resin; 40 parts of hydrogenated bisphenol A type epoxy resin; 10 parts of bisphenol F type epoxy resin; 20 parts of liquid nitrile rubber modified epoxy resin ETBN; 10 parts of reactive diluent; 6 parts of hydrophobic fumed silica; 2 parts of KH560 coupling agent; 0.3 parts of defoamer; 0.1 parts of ultraviolet absorber; 80 parts of 200-mesh activated silica powder; 80 parts of 400-mesh activated silica powder; 40 parts of 1250-mesh activated silica powder. Component B: 70 parts of pre-accelerated modified alicyclic amine curing agent; 20 parts of low-activity modified aliphatic amine; 4 parts of hydrophobic fumed silica; 80 parts of 200-mesh activated silica powder; 80 parts of 400-mesh activated silica powder; 40 parts of 1250-mesh activated silica powder. In Examples 2 to 6, A:B = 3:1, and the proportions of each raw material in Examples 1 to 6 are shown in Table 1 below: Table 1
[0045] Comparative Example 1: The difference from Example 1 is that only 200-mesh activated silica powder is used as filler in components A and B, while the total number of parts remains the same.
[0046] Comparative Example 2: The difference from Example 1 is that only 400-mesh activated silica powder is used as filler in components A and B, while the total number of parts remains the same.
[0047] Comparative Example 3: The difference from Example 1 is that only 1250 mesh active silica powder is used as filler in components A and B, while the total number of parts remains the same.
[0048] Comparative Example 4: The difference from Example 1 is that the filler in components A and B is ordinary (non-active) silica powder.
[0049] Comparative Example 5: The difference from Example 1 is that in component A, hydrogenated bisphenol A epoxy resin is replaced with an equal amount of bisphenol A epoxy resin.
[0050] Comparative Example 6: The difference from Example 1 is that in component A, C12-C14 alkyl glycidyl ether is replaced with an equal amount of butyl glycidyl ether (BGE).
[0051] Comparative Example 7: The difference from Example 1 is that in component A, hydrogenated bisphenol A epoxy resin is replaced with an equal amount of bisphenol A epoxy resin, and C12-C14 alkyl glycidyl ether is replaced with an equal amount of butyl glycidyl ether (BGE).
[0052] For the above embodiments and comparative examples, tests were conducted on curing rate (12h, 24h, 48h), bonding time, water absorption rate, and steel-to-steel tensile shear strength reduction rate (resistance to damp heat aging and salt spray media). The test results are shown in Tables 2 and 3.
[0053] Table 2
[0054] Table 3
[0055] Combining Tables 2 and 3: As can be seen from Examples 1-6, within the preferred formulation range of this application, the prepared epoxy adhesive has excellent comprehensive performance, with outstanding features including extremely low water absorption (all less than 0.1%, close to zero) and excellent durability (the decrease rate of steel-to-steel tensile shear strength after damp heat aging and salt spray is less than 2%), meeting the requirements for long-term use in harsh marine environments.
[0056] In conjunction with Examples 1 and Comparative Examples 1, 2, and 3, the multi-graded activated silica powder forms the densest packing and has lower porosity compared to the single-graded powder, resulting in enhanced resistance to media penetration. Comparative Example 3, using 1250-mesh activated silica powder, has a large specific surface area and high oil absorption, but its dispersion difficulties lead to structural defects, resulting in the worst performance.
[0057] Combined with Example 1 and Comparative Example 4, the activated silica micropowder, due to its surface activation treatment and hydrophobic modification, establishes a strong chemical bond between resins, enhances interfacial adhesion, effectively prevents the accumulation of water molecules, chloride ions and other media at the interface, and effectively prevents performance degradation caused by interfacial damage. Therefore, Example 1 has a low water absorption rate, low interfacial adhesion (low rate of decrease in steel-to-steel tensile shear strength), and strong resistance to damp heat and salt spray media.
[0058] In conjunction with Examples 1 and Comparative Examples 5, 6, and 7, the hydrophobicity and hydrolysis resistance of the hydrogenated bisphenol A epoxy resin, along with the small molecule hydrophobic units provided by the C12-C14 long-chain alkyl glycidyl ether, resulted in a synergistic effect between the hydrophobic main chain and the small molecule hydrophobic units, reducing the system's water absorption rate and improving its resistance to damp heat and environmental conditions. Therefore, Example 1 is superior to Comparative Examples 5 and 6, while Comparative Example 7, which replaced both components, showed the most severe performance degradation, with a water absorption rate as high as 0.52%.
[0059] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. An epoxy adhesive for assembling bridge segments in a marine environment, characterized in that, It includes component A and component B, and the mass ratio of component A to component B is (2-4):1, wherein: Based on parts by weight, component A comprises: 80-90 parts epoxy resin, 10-20 parts modified epoxy resin, 10-15 parts reactive diluent, 4-8 parts thixotropic agent, 1-3 parts coupling agent, 0.3-0.5 parts defoamer, 0.1-0.2 parts ultraviolet absorber, and 200-250 parts filler; the epoxy resin includes bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin, and bisphenol F type epoxy resin, and the reactive diluent is C12-C14 alkyl glycidyl ether; According to the mass fraction, component B includes: 80-100 parts of modified amine curing agent, 3-5 parts of thixotropic agent, and 200-250 parts of filler, wherein the filler is composed of activated silica powder with different gradations.
2. The epoxy adhesive for assembling bridge segments in a marine environment as described in claim 1, characterized in that: The mass ratio of bisphenol A type epoxy resin, hydrogenated bisphenol A type epoxy resin and bisphenol F type epoxy resin is 1:(1~1.5):(0.2~0.4).
3. The epoxy adhesive for assembling bridge segments in a marine environment as described in claim 1, characterized in that: The modified epoxy resin includes one or more of liquid nitrile rubber modified epoxy resin and polyurethane modified epoxy resin.
4. The epoxy adhesive for assembling bridge segments in a marine environment as described in claim 1, characterized in that: The thixotropic agent is hydrophobic fumed silica; And / or, the coupling agent includes one or more of silane coupling agents KH-550, KH-560, and KH-570; And / or, the defoamer is a modified polysiloxane defoamer; And / or, the ultraviolet absorber is a benzotriazole ultraviolet absorber; And / or, the filler comprises 200-mesh activated silica powder, 400-mesh activated silica powder and 1250-mesh activated silica powder, with the mass ratio of 200-mesh activated silica powder, 400-mesh activated silica powder and 1250-mesh activated silica powder being 1:(1~1.5):(0.2~0.8).
5. The epoxy adhesive for assembling bridge segments in a marine environment as described in claim 1, characterized in that: The modified amine curing agent comprises pre-promoted modified alicyclic amines and low-activity modified fatty amines, with a mass ratio of (3-4):
1.
6. The epoxy adhesive for assembling bridge segments in a marine environment as described in claim 5, characterized in that: The pre-promoted modified alicyclic amine is an alicyclic amine with phenol or alkylphenol introduced into it, and the alicyclic amine is isophorone diamine or methylcyclohexanediamine.
7. The epoxy adhesive for assembling bridge segments in a marine environment as described in claim 5, characterized in that: The low-activity modified fatty amine is a product obtained by ring-opening addition of a fatty amine to an epoxide, wherein the fatty amine is a polyether diamine and the epoxide is a phenyl glycidyl ether.
8. A method for preparing an epoxy adhesive for assembling bridge segments in a marine environment as described in any one of claims 1 to 7, characterized in that, It includes: Mix component A and component B at a mass ratio of (2-4):1, stir until homogeneous, and it is ready.
9. The method for preparing the epoxy adhesive for assembling bridge segments in a marine environment as described in claim 8, characterized in that: The preparation steps of component A include: Premixing: Add epoxy resin, modified epoxy resin, reactive diluent and ultraviolet absorber into the reactor, and stir at 300-500 rpm for 20-30 minutes at a temperature of 50℃±5℃ until all liquid components are mixed evenly, the ultraviolet absorber is completely dissolved, and the system is transparent. Dispersion: Add coupling agent, thixotropic agent and filler in sequence, and disperse at high speed of 800-1200 rpm for 40-60 minutes; Discharge: Add defoamer, stir at 300-500 rpm for 5-10 minutes, then remove bubbles under a vacuum of -0.095 MPa to -0.1 MPa for 15-20 minutes. After releasing the vacuum, discharge the material and seal it in packaging.
10. The method for preparing the epoxy adhesive for assembling bridge segments in a marine environment as described in claim 8, characterized in that: The preparation steps of component B include: Premixing: Add the modified amine curing agent to the mixing tank; Dispersion: Add thixotropic agent and filler to the stirred tank and vacuum stir at 600-800 rpm for 30-45 minutes until all components are mixed evenly; Discharge: Discharge the material and seal it for packaging.