Weather-resistant and corrosion-resistant engineering reinforcement structure adhesive and preparation method thereof

Abstract

The invention belongs to the technical field of adhesives, and particularly relates to a weather-resistant and corrosion-resistant engineering reinforcing structure adhesive and a preparation method thereof. The weather-resistant and corrosion-resistant engineering reinforcement structure adhesive comprises the following components in parts by weight: a component A: 100 parts of epoxy resin; 7-12 parts of a toughening agent; 1-2 parts of a coupling agent; 0.5 to 1 part of a defoaming agent; 2-5 parts of fumed silica; a component B: 30-40 parts of a curing agent; 1-3 parts of a curing accelerator; the curing agent comprises a modified curing agent, a phenolic aldehyde amine modified epoxy curing agent and a model 593 epoxy resin curing agent in a weight ratio of 1: (1.2-1.4): (0.6-0.8). The product provided by the invention has excellent performance at normal temperature, and can meet the requirements of sticking and reinforcing steel bridges in extreme temperature regions.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesives, and in particular relates to a weather-resistant and corrosion-resistant engineering reinforcement structural adhesive and a preparation method thereof. Background Art

[0002] Structural adhesives for engineering reinforcement are high-performance adhesives specifically designed for structural reinforcement. They are widely used in the repair and enhancement of infrastructure such as bridges, tunnels, and buildings. These adhesives are primarily used to securely bond carbon fiber cloth, glass fiber cloth, or other reinforcement materials to substrates such as concrete, steel, or masonry, thereby improving the load-bearing capacity, durability, and seismic resistance of the existing structure.

[0003] Epoxy resin is the most commonly used structural adhesive, with high strength, good adhesion, excellent chemical corrosion resistance and environmental stability, suitable for most structural reinforcement projects. TM EP128 epoxy resin is a commonly used reinforcing epoxy resin, but the performance of the adhesives currently available on the market cannot meet the market's increasingly high demands. At the same time, the temperature inside steel bridges fluctuates greatly with the change of seasons. In summer, the temperature inside these bridges can rise to over 60°C, while in winter, the lowest temperature inside steel bridges in some areas will drop below -20°C. This extreme temperature change poses a severe challenge to the safety and durability of bridge structures. However, the glass transition temperature (Tg) of common structural adhesives currently on the market is generally low, which means that their performance will drop significantly at high temperatures and cannot meet the reinforcement needs.

[0004] Therefore, there is an urgent need for a weather-resistant and corrosion-resistant engineering reinforcement structural adhesive and a preparation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide a weather-resistant and corrosion-resistant engineering reinforcement structural adhesive and a preparation method thereof.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A weather-resistant and corrosion-resistant engineering reinforcement structural adhesive comprises the following components in parts by weight:

[0008] Component A: 100 parts epoxy resin; 7-12 parts toughening agent; 1-2 parts coupling agent; 0.5-1 part defoaming agent; 2-5 parts fumed silica;

[0009] Component B: 30-40 parts of curing agent; 1-3 parts of curing accelerator; the curing agent includes a modified curing agent, a phenalkamine modified epoxy curing agent and a model 593 epoxy resin curing agent in a weight ratio of 1: (1.2-1.4): (0.6-0.8).

[0010] Furthermore, the epoxy equivalent of the epoxy resin is 190-200 g / mol.

[0011] Furthermore, the epoxy resin can be commercially available or prepared by conventional methods. Commercially available epoxy resins may be BECKOPOX TM EP128 epoxy resin. Brand: allnex resin.

[0012] Furthermore, the amine value of the epoxy resin curing agent model 593 is 550-700 mgKOH / g. The epoxy resin curing agent model 593 is a modified form of aliphatic amine and is obtained from Shandong Pinshang New Materials Co., Ltd.

[0013] Furthermore, the amine value of the phenalkamine-modified epoxy curing agent is 450-550 mgKOH / g. Shandong Pinshang New Materials Co., Ltd., Model: T31-1 Epoxy Curing Agent.

[0014] Furthermore, the preparation method of the modified curing agent includes the following steps: adding 0.1 mol of acrylate to 0.12-0.15 mol of diethylenetriamine, reacting at a constant temperature of 60-65°C for 2-3 hours, and then heating to 80-85°C and continuing to react for 1-2 hours to obtain the modified curing agent.

[0015] Furthermore, the acrylic acid ester includes hexadecyl acrylate and tetradecyl acrylate in a molar ratio of (2-3):1.

[0016] Furthermore, the toughening agent is a core-shell rubber toughening agent.

[0017] Furthermore, the core-shell rubber toughening agent includes an organic silicon core-shell toughening agent, a styrene-butadiene rubber core-shell toughening agent and a polybutadiene rubber core-shell toughening agent in a weight ratio of (0.2-0.5):1:(1.3-1.6).

[0018] Furthermore, the coupling agent is selected from one or more of silane coupling agent KH550, silane coupling agent KH560 and silane coupling agent KH570.

[0019] Furthermore, the defoaming agent is an epoxy resin defoaming agent of model XWC-813, purchased from Hefei Xinwancheng Environmental Protection Technology Co., Ltd.

[0020] Further, fumed silica, model HB-139, Hubei Huifu Nanomaterials Co., Ltd.

[0021] Furthermore, the curing accelerator is 2,4,6-tris(dimethylamino)phenol.

[0022] The present invention also provides a method for preparing a weather-resistant and corrosion-resistant engineering reinforcement structural adhesive, comprising the following steps: mixing epoxy resin, a toughening agent, a coupling agent, a defoaming agent, and fumed silica to obtain component A; mixing a curing agent and a curing accelerator to obtain component B; mixing components A and B, and curing to obtain the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive.

[0023] Furthermore, the curing conditions are: curing temperature of 90-100° C., and curing time of 1.5-2.0 h.

[0024] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0025] 1. The adhesive of the present invention has excellent tensile strength and elongation at break at room temperature and good corrosion resistance through the synergistic effect of multiple raw materials. At the same time, the glass transition temperature of the adhesive is improved. After heating and cooling, the mechanical properties of the adhesive still maintain a relatively good effect, which is higher than most commercially available products.

[0026] 2. The present invention can improve the tensile strength and compressive strength of the adhesive by adding a compounded curing agent, and further use a specific core-shell toughening agent to improve the compressive strength and elongation at break of the adhesive. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] This embodiment provides a weather-resistant and corrosion-resistant engineering reinforcement structural adhesive, comprising the following components in parts by weight:

[0030] Component A: 100 parts epoxy resin; 9 parts toughening agent; 1.6 parts coupling agent; 0.7 parts defoaming agent; 4 parts fumed silica;

[0031] Component B: 34 parts of curing agent; 2 parts of curing accelerator; the curing agent includes a modified curing agent, a phenalkamine modified epoxy curing agent and a model 593 epoxy resin curing agent in a weight ratio of 1:1.3:0.7.

[0032] The epoxy equivalent weight of the epoxy resin is 190-200 g / mol. Model BECKOPOX TM EP128 epoxy resin. Brand: allnex resin.

[0033] The amine value of the epoxy resin curing agent model 593 is 550-700 mgKOH / g. The epoxy resin curing agent model 593 is a modified form of aliphatic amine and is sourced from Shandong Pinshang New Materials Co., Ltd.

[0034] Phenolic amine-modified epoxy curing agent with an amine value of 450-550 mgKOH / g. Shandong Pinshang New Materials Co., Ltd., Model: T31-1 epoxy curing agent.

[0035] The preparation method of the modified curing agent includes the following steps: adding 0.1 mol of acrylate to 0.13 mol of diethylenetriamine, wherein the acrylate includes hexadecyl acrylate and tetradecyl acrylate in a molar ratio of 2.6:1; reacting at a constant temperature of 62°C for 2.5 hours, then heating to 83°C and continuing the reaction for 1.5 hours to obtain the modified curing agent.

[0036] The toughening agent is a core-shell rubber toughening agent. The core-shell rubber toughening agent includes a silicone core-shell toughening agent, a styrene-butadiene rubber core-shell toughening agent, and a polybutadiene rubber core-shell toughening agent in a weight ratio of 0.4:1:1.5. The styrene-butadiene rubber core-shell toughening agent has a carrier resin of bisphenol A epoxy resin; a rubber core-shell of styrene-butadiene rubber; and a rubber core-shell content of 25wt%. Model YT2125, Shanghai Zhuzi New Materials Co., Ltd. The polybutadiene rubber core-shell toughening agent has a carrier resin of BNE200 phenolic epoxy resin, a rubber core-shell of polybutadiene rubber, and a rubber core-shell content of 30wt%. Model YT3127, Shanghai Zhuzi New Materials Co., Ltd. The silicone core-shell toughening agent has a carrier resin of bisphenol A epoxy resin; a rubber core-shell of silicone; and a rubber core-shell content of 25wt%. Model YT-1262, Shanghai Zhuzi New Materials Co., Ltd.

[0037] The coupling agent is silane coupling agent KH550. The defoamer is epoxy resin defoamer model XWC-813, purchased from Hefei Xinwancheng Environmental Protection Technology Co., Ltd. Fumed silica, model HB-139, is from Hubei Huifu Nanomaterials Co., Ltd. The curing accelerator is 2,4,6-tris(dimethylamino)phenol.

[0038] The preparation method of the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive comprises the following steps: mixing epoxy resin, a toughening agent, a coupling agent, a defoaming agent, and fumed silica to obtain component A; mixing a curing agent and a curing accelerator to obtain component B; mixing components A and B and curing them under the following curing conditions: a curing temperature of 95° C. and a curing time of 1.8 hours, thereby obtaining the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive.

[0039] Example 2

[0040] This embodiment provides a weather-resistant and corrosion-resistant engineering reinforcement structural adhesive, comprising the following components in parts by weight:

[0041] Component A: 100 parts epoxy resin; 7 parts toughening agent; 2 parts coupling agent; 0.5 parts defoaming agent; 5 parts fumed silica;

[0042] Component B: 30 parts of curing agent; 3 parts of curing accelerator; the curing agent includes a modified curing agent, a phenalkamine modified epoxy curing agent and a model 593 epoxy resin curing agent in a weight ratio of 1:1.2:0.8.

[0043] The epoxy equivalent weight of the epoxy resin is 190-200 g / mol. Model BECKOPOX TM EP128 epoxy resin. Brand: allnex resin.

[0044] The amine value of the epoxy resin curing agent model 593 is 550-700 mgKOH / g. The epoxy resin curing agent model 593 is a modified form of aliphatic amine and is sourced from Shandong Pinshang New Materials Co., Ltd.

[0045] Phenolic amine-modified epoxy curing agent with an amine value of 450-550 mgKOH / g. Shandong Pinshang New Materials Co., Ltd., Model: T31-1 epoxy curing agent.

[0046] The preparation method of the modified curing agent includes the following steps: adding 0.1 mol of acrylate to 0.12 mol of diethylenetriamine, wherein the acrylate includes hexadecyl acrylate and tetradecyl acrylate in a molar ratio of 3:1; reacting at a constant temperature of 60°C for 3 hours, then continuously heating to 80°C and continuing the reaction for 2 hours to obtain the modified curing agent.

[0047] The toughening agent is a core-shell rubber toughening agent. The core-shell rubber toughening agent includes a silicone core-shell toughening agent, a styrene-butadiene rubber core-shell toughening agent, and a polybutadiene rubber core-shell toughening agent in a weight ratio of 0.2:1:1.6. The styrene-butadiene rubber core-shell toughening agent has a carrier resin of bisphenol A epoxy resin; a rubber core-shell of styrene-butadiene rubber; and a rubber core-shell content of 25wt%. Model YT2125, Shanghai Zhuzi New Materials Co., Ltd. The polybutadiene rubber core-shell toughening agent has a carrier resin of BNE200 phenolic epoxy resin, a rubber core-shell of polybutadiene rubber, and a rubber core-shell content of 30wt%. Model YT3127, Shanghai Zhuzi New Materials Co., Ltd. The silicone core-shell toughening agent has a carrier resin of bisphenol A epoxy resin; a rubber core-shell of silicone; and a rubber core-shell content of 25wt%. Model YT-1262, Shanghai Zhuzi New Materials Co., Ltd.

[0048] The coupling agent was silane coupling agent KH560. The defoamer was epoxy resin defoamer model XWC-813, purchased from Hefei Xinwancheng Environmental Protection Technology Co., Ltd. The fumed silica, model HB-139, was purchased from Hubei Huifu Nanomaterials Co., Ltd. The curing accelerator was 2,4,6-tris(dimethylamino)phenol.

[0049] The preparation method of the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive comprises the following steps: mixing epoxy resin, a toughening agent, a coupling agent, a defoaming agent, and fumed silica to obtain component A; mixing a curing agent and a curing accelerator to obtain component B; mixing components A and B and curing them under the following curing conditions: a curing temperature of 90° C. and a curing time of 2.0 hours, thereby obtaining the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive.

[0050] Example 3

[0051] This embodiment provides a weather-resistant and corrosion-resistant engineering reinforcement structural adhesive, comprising the following components in parts by weight:

[0052] Component A: 100 parts epoxy resin; 12 parts toughening agent; 1 part coupling agent; 1 part defoaming agent; 2 parts fumed silica;

[0053] Component B: 40 parts of curing agent; 1 part of curing accelerator; the curing agent includes a modified curing agent, a phenalkamine modified epoxy curing agent and a model 593 epoxy resin curing agent in a weight ratio of 1:1.4:0.6.

[0054] The epoxy equivalent weight of the epoxy resin is 190-200 g / mol. Model BECKOPOX TM EP128 epoxy resin. Brand: allnex resin.

[0055] The amine value of the epoxy resin curing agent model 593 is 550-700 mgKOH / g. The epoxy resin curing agent model 593 is a modified form of aliphatic amine and is sourced from Shandong Pinshang New Materials Co., Ltd.

[0056] Phenolic amine-modified epoxy curing agent with an amine value of 450-550 mgKOH / g. Shandong Pinshang New Materials Co., Ltd., Model: T31-1 epoxy curing agent.

[0057] The preparation method of the modified curing agent includes the following steps: adding 0.1 mol of acrylate to 0.15 mol of diethylenetriamine, wherein the acrylate includes hexadecyl acrylate and tetradecyl acrylate in a molar ratio of 2:1; reacting at a constant temperature of 65°C for 2 hours, then continuously heating to 85°C and continuing the reaction for 1 hour to obtain the modified curing agent.

[0058] The toughening agent is a core-shell rubber toughening agent. The core-shell rubber toughening agent includes a silicone core-shell toughening agent, a styrene-butadiene rubber core-shell toughening agent, and a polybutadiene rubber core-shell toughening agent in a weight ratio of 0.5:1:1.3. The styrene-butadiene rubber core-shell toughening agent has a carrier resin of bisphenol A epoxy resin; a rubber core-shell of styrene-butadiene rubber; and a rubber core-shell content of 25wt%. Model YT2125, Shanghai Zhuzi New Materials Co., Ltd. The polybutadiene rubber core-shell toughening agent has a carrier resin of BNE200 phenolic epoxy resin, a rubber core-shell of polybutadiene rubber, and a rubber core-shell content of 30wt%. Model YT3127, Shanghai Zhuzi New Materials Co., Ltd. The silicone core-shell toughening agent has a carrier resin of bisphenol A epoxy resin; a rubber core-shell of silicone; and a rubber core-shell content of 25wt%. Model YT-1262, Shanghai Zhuzi New Materials Co., Ltd.

[0059] The coupling agent is silane coupling agent KH570. The defoamer is epoxy resin defoamer model XWC-813, purchased from Hefei Xinwancheng Environmental Protection Technology Co., Ltd. Fumed silica, model HB-139, is from Hubei Huifu Nanomaterials Co., Ltd. The curing accelerator is 2,4,6-tris(dimethylamino)phenol.

[0060] The preparation method of the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive comprises the following steps: mixing epoxy resin, a toughening agent, a coupling agent, a defoaming agent, and fumed silica to obtain component A; mixing a curing agent and a curing accelerator to obtain component B; mixing components A and B and curing them under the following curing conditions: a curing temperature of 100° C. and a curing time of 1.5 hours, thereby obtaining the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive.

[0061] Comparative Example 1

[0062] This comparative example differs from Example 1 in that the curing agent comprises a modified curing agent, a phenalkamine-modified epoxy curing agent, and a 593 epoxy resin curing agent in a weight ratio of 1:1:1. The preparation methods and types of the modified curing agent, the phenalkamine-modified epoxy curing agent, and the 593 epoxy resin curing agent are the same as those in Example 1.

[0063] Comparative Example 2

[0064] This comparative example differs from Example 1 in that the curing agent used is a phenalkamine-modified epoxy curing agent with an amine value of 450-550 mgKOH / g. Shandong Pinshang New Materials Co., Ltd., model number: T31-1 epoxy curing agent.

[0065] Comparative Example 3

[0066] The difference between this comparative example and Example 1 is that the curing agent includes a phenalkamine-modified epoxy curing agent and a model 593 epoxy resin curing agent in a weight ratio of 1.3:0.7.

[0067] The amine value of the epoxy resin curing agent model 593 is 550-700 mgKOH / g. The epoxy resin curing agent model 593 is a modified form of aliphatic amine and is sourced from Shandong Pinshang New Materials Co., Ltd.

[0068] Phenolic amine-modified epoxy curing agent with an amine value of 450-550 mgKOH / g. Shandong Pinshang New Materials Co., Ltd., Model: T31-1 epoxy curing agent.

[0069] Comparative Example 4

[0070] The difference between this comparative example and Example 1 is that the preparation method of the modified curing agent comprises the following steps: 0.1 mol of dodecyl acrylate is added dropwise to 0.13 mol of triethylenetetramine, reacted at a constant temperature of 62° C. for 2.5 hours, and then the temperature is raised to 83° C. and the reaction is continued for 1.5 hours to obtain the modified curing agent.

[0071] Comparative Example 5

[0072] This comparative example differs from Example 1 in that the core-shell rubber toughening agent comprises a silicone core-shell toughening agent, a styrene-butadiene rubber core-shell toughening agent, and a polybutadiene rubber core-shell toughening agent in a weight ratio of 1:1:1. The styrene-butadiene rubber core-shell toughening agent has a carrier resin of bisphenol A epoxy resin, a rubber core-shell of styrene-butadiene rubber, and a rubber core-shell content of 25 wt%. Model: YT2125, Shanghai Zhuzi New Materials Co., Ltd. The polybutadiene rubber core-shell toughening agent has a carrier resin of BNE200 phenolic epoxy resin, a rubber core-shell of polybutadiene rubber, and a rubber core-shell content of 30 wt%. Model: YT3127, Shanghai Zhuzi New Materials Co., Ltd. The silicone core-shell toughening agent has a carrier resin of bisphenol A epoxy resin, a rubber core-shell of silicone, and a rubber core-shell content of 25 wt%. Model: YT-1262, Shanghai Zhuzi New Materials Co., Ltd.

[0073] Comparative Example 6

[0074] This comparative example differs from Example 1 in that the core-shell rubber toughener is a polybutadiene rubber core-shell toughener. The carrier resin is BNE200 phenolic epoxy resin, and the rubber core-shell is polybutadiene rubber, with a rubber core-shell content of 30 wt%. Model: YT3127, Shanghai Zhuzi New Materials Co., Ltd.

[0075] Comparative Example 7

[0076] This comparative example differs from Example 1 in that the core-shell rubber toughening agent comprises a styrene-butadiene rubber core-shell toughening agent and a polybutadiene rubber core-shell toughening agent in a weight ratio of 1:1.5. The styrene-butadiene rubber core-shell toughening agent uses a bisphenol A epoxy resin as the carrier resin, and the rubber core-shell is styrene-butadiene rubber, with a rubber core-shell content of 25 wt%. Model: YT2125, Shanghai Zhuzi New Materials Co., Ltd. The polybutadiene rubber core-shell toughening agent uses a BNE200 phenolic epoxy resin as the carrier resin, a polybutadiene rubber core-shell, and a rubber core-shell content of 30 wt%. Model: YT3127, Shanghai Zhuzi New Materials Co., Ltd.

[0077] Performance Testing

[0078] 1. The performance of the weather-resistant and corrosion-resistant engineering reinforcement structural adhesives prepared in Examples 1-3 and Comparative Examples 1-7 was tested. The performance at room temperature (25°C) was measured according to the following test method. The results are shown in Table 1.

[0079] Table 1 Performance test results at room temperature

[0080]

[0081] 2. Referring to the following test scheme, the mechanical properties of the product of Example 1 were tested at -25°C, -5°C, 25°C, 50°C, and 75°C. The results are shown in Table 2.

[0082] Table 2 Tensile properties of the product of Example 1 at different temperatures

[0083]

[0084]

[0085] As shown in Table 1, the adhesives prepared in Examples 1-3 of the present invention exhibit excellent room temperature tensile strength and elongation at break, demonstrating that the products of the present invention also possess excellent mechanical properties. As shown in Table 2, the mechanical properties of the adhesive in Example 1, while somewhat reduced after heating and cooling at 25°C, remain relatively ideal, exceeding those of most commercially available products.

[0086] In Comparative Examples 1-4, the tensile strength and compressive strength of the adhesives decreased due to changes in the curing agent composition. In Comparative Examples 5-7, the compressive strength and elongation at break of the adhesives decreased due to changes in the toughening agent composition. Furthermore, the mechanical properties of Comparative Examples 1-7 at extreme temperatures were also unsatisfactory.

[0087] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A weather-resistant and corrosion-resistant engineering reinforcement structural adhesive, characterized in that: The composition comprises the following components in parts by weight: Component A: 100 parts epoxy resin; 7-12 parts toughening agent; 1-2 parts coupling agent; 0.5-1 part defoaming agent; 2-5 parts fumed silica; Component B: 30-40 parts of curing agent; 1-3 parts of curing accelerator; the curing agent includes a modified curing agent, a phenalkamine modified epoxy curing agent and a model 593 epoxy resin curing agent in a weight ratio of 1: (1.2-1.4): (0.6-0.8).

2. The weather-resistant and corrosion-resistant engineering reinforcement structural adhesive according to claim 1, characterized in that: The epoxy equivalent weight of the epoxy resin is 190-200 g / mol.

3. The weather-resistant and corrosion-resistant engineering reinforcement structural adhesive according to claim 2, characterized in that: The amine value of the epoxy resin curing agent model 593 is 550-700 mgKOH / gram.

4. The weather-resistant and corrosion-resistant engineering reinforcement structural adhesive according to claim 3, characterized in that: The amine value of the phenalkamine modified epoxy curing agent is 450-550 mgKOH / g.

5. The weather-resistant and corrosion-resistant engineering reinforcement structural adhesive according to claim 4, characterized in that: The preparation method of the modified curing agent comprises the following steps: adding 0.1 mol of acrylate to 0.12-0.15 mol of diethylenetriamine, reacting at a constant temperature of 60-65° C. for 2-3 hours, then heating to 80-85° C. and reacting for 1-2 hours to obtain the modified curing agent.

6. The weather-resistant and corrosion-resistant engineering reinforcement structural adhesive according to claim 5, characterized in that: The acrylic acid ester includes hexadecyl acrylate and tetradecyl acrylate in a molar ratio of (2-3):

1.

7. The weather-resistant and corrosion-resistant engineering reinforcement structural adhesive according to claim 1, characterized in that: The toughening agent is a core-shell rubber toughening agent.

8. The weather-resistant and corrosion-resistant engineering reinforcement structural adhesive according to claim 7, characterized in that: The core-shell rubber toughening agent comprises an organic silicon core-shell toughening agent, a styrene-butadiene rubber core-shell toughening agent and a polybutadiene rubber core-shell toughening agent in a weight ratio of (0.2-0.5):1:(1.3-1.6).

9. A method for preparing the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: mixing epoxy resin, toughening agent, coupling agent, defoaming agent and fumed silica to prepare component A; mixing curing agent and curing accelerator to prepare component B; mixing components A and B, and curing to obtain a weather-resistant and corrosion-resistant engineering reinforcement structural adhesive.

10. The method for preparing the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive according to claim 9, characterized in that: The curing conditions are: curing temperature is 90-100°C, and curing time is 1.5-2.0h.

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