Weather-resistant and corrosion-resistant engineering reinforcing structural adhesive and preparation method thereof

Abstract

The application 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 reinforcing structure adhesive comprises the following components in parts by weight: 100 parts of an epoxy resin; 7-12 parts of a toughening agent; 1-2 parts of a coupling agent; 0.5-1 part of a defoaming agent; 2-5 parts of fumed silica; 30-40 parts of a curing agent; 1-3 parts of a curing accelerator; the curing agent comprises a modified curing agent, a phenolic amine modified epoxy curing agent and an epoxy resin curing agent of model 593 in a weight ratio of 1:(1.2-1.4):(0.6-0.8). The product has excellent performance at room temperature, and can meet the needs of steel bridge pasting reinforcement in extreme temperature areas.

Description

Technical Field

[0001] This invention belongs to the field of adhesive technology, specifically relating to a weather-resistant and corrosion-resistant engineering reinforcement structural adhesive and its preparation method. Background Technology

[0002] Structural reinforcement adhesives are high-performance adhesives specifically designed for strengthening building structures. They are widely used for the repair and reinforcement of infrastructure such as bridges, tunnels, and buildings. These adhesives are primarily used to firmly bond carbon fiber cloth, fiberglass cloth, or other reinforcement materials to substrates such as concrete, steel, or masonry, thereby improving the load-bearing capacity, durability, and seismic performance of the original structure.

[0003] Epoxy resins are among the most commonly used structural adhesives, possessing high strength, good adhesion, excellent chemical resistance, and environmental stability, making them suitable for most structural reinforcement projects. The model name for Zhanxin resin is BECKOPOX. TM EP128 epoxy resin is a commonly used reinforcing epoxy resin, but the performance of adhesives made from it currently on the market cannot meet the increasingly demanding requirements. Furthermore, the internal temperature of steel bridges fluctuates dramatically with seasonal changes. In summer, the internal temperature of these bridges can rise above 60°C, while in winter, the lowest temperature inside some areas can drop below -20°C. This extreme temperature variation poses a severe challenge to the safety and durability of bridge structures. However, the glass transition temperature (Tg) of commonly available structural adhesives is generally low, meaning their performance deteriorates significantly at high temperatures, failing to meet reinforcement requirements.

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

[0005] The purpose of this invention is to provide a weather-resistant and corrosion-resistant structural adhesive for engineering reinforcement and its preparation method.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A weather-resistant and corrosion-resistant engineering reinforcement structural adhesive, comprising 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 defoamer; 2-5 parts fumed silica;

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

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

[0011] Furthermore, the epoxy resin is commercially available or prepared by conventional methods. Commercially available epoxy resins may be of the type BECKOPOX. TM EP128 epoxy resin. Brand: Zhanxin Resin.

[0012] Furthermore, the amine value of epoxy resin curing agent No. 593 is 550-700 mg KOH / g. Epoxy resin curing agent No. 593 is a modified fatty amine, sourced from Shandong Pinshang New Materials Co., Ltd.

[0013] Furthermore, the amine value of the phenolic amine 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℃ for 2-3 hours, and then continuing to react at 80-85℃ for another 1-2 hours to obtain the modified curing agent.

[0015] Furthermore, the acrylates include 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 organosilicon 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 agents KH550, KH560, and KH570.

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

[0020] Furthermore, 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, toughening agent, coupling agent, defoamer, and fumed silica to obtain component A; mixing curing agent and curing accelerator to obtain component B; mixing component A and component 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℃ and curing time of 1.5-2.0h.

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

[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, it improves the glass transition temperature of the adhesive. The mechanical properties of the adhesive remain superior after heating and cooling, which is higher than most commercially available products.

[0026] 2. By adding a compound curing agent, the present invention can improve the reduction of tensile strength and compressive strength of adhesives. Furthermore, by using a specific core-shell toughening agent, the compressive strength and elongation at break of the adhesives can be improved. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] This embodiment provides a weather-resistant and corrosion-resistant structural adhesive for engineering reinforcement, 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 defoamer; 4 parts fumed silica;

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

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

[0033] The amine value of epoxy resin curing agent No. 593 is 550-700 mg KOH / g. No. 593 epoxy resin curing agent is a modified fatty amine and is sourced from Shandong Pinshang New Materials Co., Ltd.

[0034] The amine value of the phenolic amine modified epoxy curing agent is 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: 0.1 mol of acrylate is added dropwise to 0.13 mol of diethylenetriamine, the acrylate including hexadecyl acrylate and tetradecyl acrylate in a molar ratio of 2.6:1; the reaction is carried out at a constant temperature of 62℃ for 2.5 h, and then the temperature is raised to 83℃ and the reaction is continued for another 1.5 h to obtain the modified curing agent.

[0036] The toughening agent is a core-shell rubber toughening agent. The core-shell rubber toughening agent comprises an organosilicon 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 uses bisphenol A type epoxy resin as the carrier resin; the rubber core and shell are styrene-butadiene rubber; the rubber core and shell content is 25 wt%. Model YT2125, Shanghai Zhuzi New Materials Co., Ltd. The polybutadiene rubber core-shell toughening agent uses BNE200 phenolic epoxy resin as the carrier resin; the rubber core and shell are polybutadiene rubber; the rubber core and shell content is 30 wt%. Model YT3127, Shanghai Zhuzi New Materials Co., Ltd. The organosilicon core-shell toughening agent uses bisphenol A type epoxy resin as the carrier resin; the rubber core and shell are organosilicon; the rubber core and shell content is 25 wt%. Model YT-1262, Shanghai Zhuzi New Materials Co., Ltd.

[0037] The coupling agent is silane coupling agent KH550. The defoamer is epoxy resin defoamer 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 includes the following steps: mixing epoxy resin, toughening agent, coupling agent, defoamer, and fumed silica to obtain component A; mixing curing agent and curing accelerator to obtain component B; mixing component A and component B and curing, wherein the curing conditions are: curing temperature of 95℃ and curing time of 1.8h, to obtain the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive.

[0039] Example 2

[0040] This embodiment provides a weather-resistant and corrosion-resistant structural adhesive for engineering reinforcement, 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 defoamer; 5 parts fumed silica;

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

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

[0044] The amine value of epoxy resin curing agent No. 593 is 550-700 mg KOH / g. No. 593 epoxy resin curing agent is a modified fatty amine and is sourced from Shandong Pinshang New Materials Co., Ltd.

[0045] The amine value of the phenolic amine modified epoxy curing agent is 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: 0.1 mol of acrylate is added dropwise to 0.12 mol of diethylenetriamine, the acrylate including hexadecyl acrylate and tetradecyl acrylate in a molar ratio of 3:1; the reaction is carried out at a constant temperature of 60℃ for 3 hours, and then the temperature is raised to 80℃ and the reaction is continued 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 comprises an organosilicon 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 uses bisphenol A type epoxy resin as the carrier resin; the rubber core and shell are styrene-butadiene rubber; the rubber core and shell content is 25 wt%. Model YT2125, Shanghai Zhuzi New Materials Co., Ltd. The polybutadiene rubber core-shell toughening agent uses BNE200 phenolic epoxy resin as the carrier resin; the rubber core and shell are polybutadiene rubber; the rubber core and shell content is 30 wt%. Model YT3127, Shanghai Zhuzi New Materials Co., Ltd. The organosilicon core-shell toughening agent uses bisphenol A type epoxy resin as the carrier resin; the rubber core and shell are organosilicon; the rubber core and shell content is 25 wt%. Model YT-1262, Shanghai Zhuzi New Materials Co., Ltd.

[0048] The coupling agent is silane coupling agent KH560. The defoamer is epoxy resin defoamer 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.

[0049] The preparation method of the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive includes the following steps: mixing epoxy resin, toughening agent, coupling agent, defoamer, and fumed silica to obtain component A; mixing curing agent and curing accelerator to obtain component B; mixing component A and component B and curing, wherein the curing conditions are: curing temperature of 90℃ and curing time of 2.0h, to obtain the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive.

[0050] Example 3

[0051] This embodiment provides a weather-resistant and corrosion-resistant structural adhesive for engineering reinforcement, 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 defoamer; 2 parts fumed silica;

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

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

[0055] The amine value of epoxy resin curing agent No. 593 is 550-700 mg KOH / g. No. 593 epoxy resin curing agent is a modified fatty amine and is sourced from Shandong Pinshang New Materials Co., Ltd.

[0056] The amine value of the phenolic amine modified epoxy curing agent is 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: 0.1 mol of acrylate is added dropwise to 0.15 mol of diethylenetriamine, the acrylate including hexadecyl acrylate and tetradecyl acrylate in a molar ratio of 2:1; the reaction is carried out at a constant temperature of 65℃ for 2 hours, and then the temperature is raised to 85℃ and the reaction is continued 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 comprises an organosilicon 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 uses bisphenol A type epoxy resin as the carrier resin; the rubber core and shell are styrene-butadiene rubber; the rubber core and shell content is 25 wt%. Model YT2125, Shanghai Zhuzi New Materials Co., Ltd. The polybutadiene rubber core-shell toughening agent uses BNE200 phenolic epoxy resin as the carrier resin; the rubber core and shell are polybutadiene rubber; the rubber core and shell content is 30 wt%. Model YT3127, Shanghai Zhuzi New Materials Co., Ltd. The organosilicon core-shell toughening agent uses bisphenol A type epoxy resin as the carrier resin; the rubber core and shell are organosilicon; the rubber core and shell content is 25 wt%. Model YT-1262, Shanghai Zhuzi New Materials Co., Ltd.

[0059] The coupling agent is silane coupling agent KH570. The defoamer is epoxy resin defoamer 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 includes the following steps: mixing epoxy resin, toughening agent, coupling agent, defoamer, and fumed silica to obtain component A; mixing curing agent and curing accelerator to obtain component B; mixing component A and component B, and curing under the following conditions: curing temperature of 100℃ and curing time of 1.5h, to obtain the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive.

[0061] Comparative Example 1

[0062] The difference between this comparative example and Example 1 is that the curing agent includes a modified curing agent, a phenolic amine modified epoxy curing agent, and an epoxy resin curing agent of type 593, all in a weight ratio of 1:1:1. The preparation methods and types of the modified curing agent, the phenolic amine modified epoxy curing agent, and the epoxy resin curing agent of type 593 are the same as in Example 1.

[0063] Comparative Example 2

[0064] The difference between this comparative example and Example 1 is that the curing agent is a phenolic amine modified epoxy curing agent. The amine value of the phenolic amine modified epoxy curing agent is 450-550 mgKOH / g. Shandong Pinshang New Materials Co., Ltd., Model: 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 phenolic amine modified epoxy curing agent with a weight ratio of 1.3:0.7 and an epoxy resin curing agent of type 593.

[0067] The amine value of epoxy resin curing agent No. 593 is 550-700 mg KOH / g. No. 593 epoxy resin curing agent is a modified fatty amine and is sourced from Shandong Pinshang New Materials Co., Ltd.

[0068] The amine value of the phenolic amine modified epoxy curing agent is 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 includes the following steps: 0.1 mol of dodecyl acrylate is added dropwise to 0.13 mol of triethylenetetramine, the mixture is reacted at a constant temperature of 62°C for 2.5 h, and then the temperature is raised to 83°C and the reaction is continued for another 1.5 h to obtain the modified curing agent.

[0071] Comparative Example 5

[0072] The difference between this comparative example and Example 1 is as follows: 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 1:1:1. The styrene-butadiene rubber core-shell toughening agent uses bisphenol A type epoxy resin as the carrier resin; the rubber core and shell are styrene-butadiene rubber; the rubber core and shell content is 25 wt%. Model YT2125, Shanghai Zhuzi New Materials Co., Ltd. The polybutadiene rubber core-shell toughening agent uses BNE200 phenolic epoxy resin as the carrier resin; the rubber core and shell are polybutadiene rubber; the rubber core and shell content is 30 wt%. Model YT3127, Shanghai Zhuzi New Materials Co., Ltd. The silicone core-shell toughening agent uses bisphenol A type epoxy resin as the carrier resin; the rubber core and shell are silicone; the rubber core and shell content is 25 wt%. Model YT-1262, Shanghai Zhuzi New Materials Co., Ltd.

[0073] Comparative Example 6

[0074] The difference between this comparative example and Example 1 is that the core-shell rubber toughening agent is a polybutadiene rubber core-shell toughening agent. The carrier resin for the polybutadiene rubber core-shell toughening agent is BNE200 phenolic epoxy resin, and the rubber core and shell are polybutadiene rubber, with a rubber core-shell content of 30 wt%. Model: YT3127, Shanghai Zhuzi New Materials Co., Ltd.

[0075] Comparative Example 7

[0076] The difference between this comparative example and Example 1 is that the core-shell rubber toughening agent includes a styrene-butadiene rubber (SBR) core-shell toughening agent and a polybutadiene rubber (PPB) core-shell toughening agent in a weight ratio of 1:1.5. The SBR core-shell toughening agent uses bisphenol A type epoxy resin as the carrier resin; the rubber core and shell are SBR; the rubber core and shell content is 25 wt%. Model YT2125, Shanghai Zhuzi New Materials Co., Ltd. The PPB core-shell toughening agent uses BNE200 phenolic epoxy resin as the carrier resin; the rubber core and shell are PPB; the rubber core and shell content is 30 wt%. Model YT3127, Shanghai Zhuzi New Materials Co., Ltd.

[0077] Performance testing

[0078] 1. Performance tests were conducted on the weather-resistant and corrosion-resistant structural adhesives for engineering reinforcement prepared in Examples 1-3 and Comparative Examples 1-7. The performance at room temperature (25°C) was determined according to the following testing methods, and the results are shown in Table 1.

[0079] Table 1 Performance test results at room temperature

[0080]

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

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

[0083]

[0084]

[0085] As shown in Table 1, the adhesives prepared in Examples 1-3 of this invention exhibit excellent room temperature tensile strength and elongation at break, demonstrating that the products of this invention also possess good mechanical properties. As shown in Table 2, the adhesive of Example 1, based on 25°C, showed a slight decrease in mechanical properties after heating and cooling, but still maintained a relatively ideal performance, exceeding that of most commercially available products.

[0086] The changes in the composition of the curing agent in Comparative Examples 1-4 resulted in a decrease in the tensile strength and compressive strength of the adhesive. Similarly, the changes in the composition of the toughening agent in Comparative Examples 5-7 resulted in a decrease in the compressive strength and elongation at break of the adhesive at room temperature. Furthermore, the mechanical properties of Comparative Examples 1-7 were also unsatisfactory under extreme temperatures.

[0087] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A weather-resistant and corrosion-resistant structural reinforcement adhesive, characterized in that, The components include the following parts by weight: Component A: 100 parts epoxy resin; 7-12 parts toughening agent; 1-2 parts coupling agent; 0.5-1 part defoamer; 2-5 parts fumed silica; The toughening agent is a core-shell rubber toughening agent, which includes organosilicon core-shell toughening agents, styrene-butadiene rubber core-shell toughening agents, and polybutadiene rubber core-shell toughening agents in a weight ratio of (0.2-0.5):1:(1.3-1.6). Component B: 30-40 parts curing agent; 1-3 parts curing accelerator; the curing agent includes a modified curing agent with a weight ratio of 1:(1.2-1.4):(0.6-0.8), a phenolic amine modified epoxy curing agent, and an epoxy resin curing agent of type 593; The preparation method of the modified curing agent includes: adding 0.1 mol of acrylate to 0.12-0.15 mol of diethylenetriamine, reacting at a constant temperature of 60-65℃ for 2-3 hours, and then continuing to react at 80-85℃ for another 1-2 hours to obtain the modified curing agent; Acrylates include hexadecyl acrylate and tetradecyl acrylate in a molar ratio of (2-3):

1.

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

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

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

5. A method for preparing the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive according to any one of claims 1-4, characterized in that, The process includes the following steps: mixing epoxy resin, toughening agent, coupling agent, defoamer and fumed silica to obtain component A; mixing curing agent and curing accelerator to obtain component B; mixing component A and component B and curing to obtain a weather-resistant and corrosion-resistant engineering reinforcement structural adhesive.

6. The method for preparing the weather-resistant and corrosion-resistant engineering reinforcement structural adhesive according to claim 5, characterized in that, The curing conditions are: curing temperature of 90-100℃ and curing time of 1.5-2.0h.

Images