High performance epoxy joint sealant for concrete precast segmental splicing

Abstract

This invention discloses a high-performance epoxy joint adhesive for splicing precast concrete segments. Based on optimized epoxy resin matrix, a "sea-island structure" toughening agent and a grafted rubber particle toughening agent are combined to achieve a higher level of unity between the strength and toughness of the joint adhesive through multiple toughening mechanisms. The "sea-island structure" is formed in situ phase separation caused by the curing reaction of the two-component epoxy resin. During the epoxy resin curing reaction, due to changes in the matrix solubility parameters, "islands" with phase separation sizes ranging from 5μm to 50μm are gradually formed. This "sea-island structure" has a significant impact-resistant toughening modification effect. The grafted rubber particle toughening agent consists of rubber particles grafted with terminal epoxy hyperbranched polyethers. The surface-grafted terminal epoxy hyperbranched polyethers increase the material's toughness while further enhancing the integrity of the rubber particles and the matrix resin through chemical bonds. Moreover, this submicron-sized grafted rubber particle and the micron-sized "sea-island structure" have a multi-scale synergistic toughening effect, thus significantly improving the colloidal fracture energy while ensuring strength. This invention achieves a higher level of unity between the strength and toughness of the joint adhesive, thereby improving its overall performance. It is of great significance for the successful development of high-performance joint adhesives that meet the needs of practical engineering.

Description

Technical Field

[0001] This invention relates to the field of structural adhesives, specifically to a high-performance epoxy joint adhesive for splicing precast concrete segments. Background Technology

[0002] Segmental prefabrication and assembly technology is a major development direction for future railway bridge construction. Joint adhesive, as a crucial connecting material for segmental beam joints, plays a vital role in the load-bearing capacity and durability of the segmental beams. Joint adhesive is characterized by its ease of application, excellent workability, rapid strength development, good extrudability, and high weather resistance; its performance directly affects the safety and stability of the segmental beams.

[0003] In recent years, prefabrication stage assembly technology has developed rapidly in bridge construction in China. The performance of joint adhesives directly affects the assembly efficiency and service life of prefabricated segmental bridges. During the assembly of segmental beams, joint adhesives act as lubricants, facilitating accurate closure of the joint surfaces. After assembly, the adhesive, through extrusion, fully wets the concrete surface. After curing, the adhesive forms a strong bond with the concrete, not only providing sealing and waterproofing but also transferring stress and acting as an anchor bolt. Because the cured adhesive is exposed to the natural environment for extended periods and subjected to continuous external dynamic loads during service, the unique construction and service conditions of railway engineering place more stringent demands on the comprehensive performance of joint adhesives compared to conventional joint adhesives. Achieving a higher level of unity between excellent working performance, high strength, and good toughness is required, which is also the main development direction for the next generation of joint adhesives used in railway engineering.

[0004] Currently, some explorations have been conducted in this area. Patent CN201811266332 discloses a high-temperature resistant epoxy structural adhesive for bridge segment splicing. By using modified high-temperature resistant epoxy resin, the prepared splice adhesive has a curing temperature range of -45 to 120℃ and exhibits good thixotropy. This satisfies both the construction process performance requirements for working time and the mechanical performance requirements for early strength, while also meeting the requirements for high-temperature resistance. Patent CN202011077085 discloses a high-modulus, high-toughness epoxy structural adhesive, its preparation method, and its application. Epoxy-grafted POSS is prepared by grafting modified amino POSS with a bifunctional epoxy diluent and introduced into the epoxy structure to improve the brittleness and insufficient fracture toughness of traditional epoxy resins. This improves the material's fracture toughness and elongation at break while maintaining or slightly increasing the material's mechanical strength and elastic modulus. Patent CN2020111788536 discloses a special adhesive for UHPC bridge splicing, which uses an epoxy group modified acrylic polyurethane resin as a toughening agent and undergoes a crosslinking reaction with a modified curing agent to prepare a bridge splicing adhesive with high strength, good toughness and excellent durability.

[0005] Since existing toughening methods for joint sealants mostly improve material toughness through a single approach, the toughening effect is limited. Moreover, while improving toughness, other properties are often damaged, making it impossible to simultaneously improve comprehensive properties such as tension, compression, bending, and shear. Therefore, modifying joint sealants through reasonable multiple toughening methods to achieve a higher level of unity between strength and toughness and improve its comprehensive performance is of great significance for the successful development of high-performance joint sealants that meet the needs of practical engineering. Summary of the Invention

[0006] To address the above problems, this invention provides a high-performance epoxy joint adhesive for splicing precast concrete segments.

[0007] The high-performance epoxy joint adhesive for splicing precast concrete segments described in this invention is a joint adhesive obtained by combining a "sea-island structure" toughening agent and a grafted rubber particle toughening agent through curing with a two-component epoxy resin. The "sea-island structure" toughening agent is one or more of bisphenol sulfide epoxy resin and liquid nitrile rubber. The "sea-island structure" is formed during the in-situ phase separation process caused by the curing of the two-component epoxy resin. The grafted rubber particle toughening agent is rubber particles grafted with terminal epoxy group hyperbranched polyether, and the rubber particles are one or more of submicron-sized acrylonitrile-butadiene-styrene (ABS) copolymer and butadiene-styrene (SBR) copolymer.

[0008] The phase separation size of the "island" is between 5 μm and 50 μm.

[0009] The particle size of the rubber particles is between 200 nm and 800 nm.

[0010] The bisphenol sulfide epoxy resin has the following general formula:

[0011]

[0012] In the formula, 0≤m≤2, 0≤n≤2, and m and n are both positive numbers.

[0013] The molecular weight range of the liquid nitrile rubber is 900~5000.

[0014] The epoxy value of the terminal epoxy hyperbranched polyether is 0.3 mol / 100g ~ 0.5 mol / 100g.

[0015] The joint adhesive contains two components, A and B. By mass, component A consists of the following components: 20-50 parts of "island structure" toughening agent, 10-30 parts of grafted rubber particle toughening agent, 80-120 parts of epoxy resin, 1-15 parts of reactive diluent, 150-400 parts of filler, 0.5-10 parts of thixotropic agent, and 0.1-5 parts of coupling agent.

[0016] The epoxy resin is one or a mixture of one or more of bisphenol F type epoxy resin 170 and bisphenol A type epoxy resin E54 in any proportion.

[0017] The cured epoxy joint adhesive has a fracture energy of ≥900N / m.

[0018] The application of a high-performance epoxy joint adhesive for splicing precast concrete segments in precast concrete bridge segment assembly projects.

[0019] Compared with existing technologies, this invention has the following advantages: According to current standards, joint adhesives require high modulus, thus necessitating the use of a higher proportion of high-modulus fillers in the adhesive. This often significantly increases the adhesive viscosity, affecting its workability. Firstly, while optimizing the base epoxy resin, a suitable toughening agent is designed and used. This system has a low liquid viscosity, allowing for the introduction of a larger proportion of fillers to ensure a high modulus after curing. Secondly, simply optimizing the epoxy resin alone cannot guarantee a high level of toughness improvement under high-strength conditions. Therefore, based on optimizing the epoxy resin base, it is necessary to use a combination of "island-structure" toughening agents and grafted rubber particle toughening agents. Utilizing their multiple toughening mechanisms allows for a higher level of balance between strength and toughness in high-performance epoxy joint adhesives for precast concrete segment splicing. The "island structure" is formed through an in-situ phase separation process caused by the curing reaction of the two-component epoxy resin. During the epoxy resin curing process, due to changes in the matrix solubility parameters, "islands" with phase separation sizes ranging from 5 μm to 50 μm gradually form. This "island structure" exhibits significant impact toughening modification effects. The grafted rubber particle toughening agent consists of rubber particles grafted with terminal epoxy hyperbranched polyethers. The particle size of the rubber particles ranges from 200 nm to 800 nm. The surface-grafted terminal epoxy hyperbranched polyethers not only increase the toughness of the material but also further enhance the integrity of the rubber particles and the matrix resin through chemical bonds. Moreover, this submicron-sized grafted rubber particle and the micron-sized "island structure" have a multi-scale synergistic toughening effect, thus significantly improving the colloidal fracture energy while ensuring strength. Detailed Implementation

[0020] To illustrate the features and effects of the present invention in detail, the following detailed description is provided in conjunction with embodiments and comparative examples.

[0021] Example 1

[0022] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0023] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0024] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.3 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0025] Bisphenol F type epoxy resin 170, 100 parts;

[0026] Reactive diluent, 5 parts;

[0027] Filler, 200 parts;

[0028] Thixotropic agent, 2 parts;

[0029] Coupling agent, 0.5 parts;

[0030] (ii) The preparation steps include:

[0031] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0032] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0033] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0034] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0035] Example 2

[0036] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0037] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0038] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.4 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0039] Bisphenol A type epoxy resin E54, 100 parts;

[0040] Reactive diluent, 5 parts;

[0041] Filler, 200 parts;

[0042] Thixotropic agent, 2 parts;

[0043] Coupling agent, 0.5 parts;

[0044] (ii) The preparation steps include:

[0045] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0046] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0047] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0048] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0049] Example 3

[0050] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0051] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=0, n=0; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0052] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.3 mol / 100g; rubber particle size is 500 nm), 30 parts;

[0053] Bisphenol F type epoxy resin 170, 100 parts;

[0054] Reactive diluent, 10 parts;

[0055] Filler, 200 parts;

[0056] Thixotropic agent, 2 parts;

[0057] Coupling agent, 0.5 parts;

[0058] (ii) The preparation steps include:

[0059] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0060] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0061] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0062] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0063] Example 4

[0064] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0065] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0066] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.5 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0067] Bisphenol F type epoxy resin 170, 100 parts;

[0068] Reactive diluent, 5 parts;

[0069] Filler, 200 parts;

[0070] Thixotropic agent, 2 parts;

[0071] Coupling agent, 0.5 parts;

[0072] (ii) The preparation steps include:

[0073] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0074] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0075] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0076] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0077] Example 5

[0078] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0079] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=2, n=2; liquid nitrile rubber with molecular weight of 5000), 30 parts;

[0080] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.5 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0081] Bisphenol F type epoxy resin 170, 100 parts;

[0082] Reactive diluent, 5 parts;

[0083] Filler, 200 parts;

[0084] Thixotropic agent, 2 parts;

[0085] Coupling agent, 0.5 parts;

[0086] (ii) The preparation steps include:

[0087] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0088] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0089] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0090] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0091] Example 6

[0092] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0093] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 5000), 30 parts;

[0094] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.4 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0095] Bisphenol F type epoxy resin 170, 100 parts;

[0096] Reactive diluent, 5 parts;

[0097] Filler, 400 parts;

[0098] Thixotropic agent, 2 parts;

[0099] Coupling agent, 0.5 parts;

[0100] (ii) The preparation steps include:

[0101] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0102] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0103] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0104] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0105] Example 7

[0106] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0107] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0108] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.4 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0109] 100 parts of a mixture of bisphenol F type epoxy resin 170 and bisphenol A type epoxy resin E54;

[0110] Reactive diluent, 5 parts;

[0111] Filler, 200 parts;

[0112] Thixotropic agent, 2 parts;

[0113] Coupling agent, 0.5 parts;

[0114] (ii) The preparation steps include:

[0115] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0116] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0117] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0118] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0119] Example 8

[0120] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0121] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0122] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.3 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0123] 170-80 parts of bisphenol F type epoxy resin;

[0124] Reactive diluent, 5 parts;

[0125] Filler, 150 parts;

[0126] Thixotropic agent, 2 parts;

[0127] Coupling agent, 0.5 parts;

[0128] (ii) The preparation steps include:

[0129] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0130] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0131] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0132] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0133] Comparative Example 1

[0134] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0135] "Island structure" toughening agent, 0 parts;

[0136] Grafted rubber particle toughening agent, 0 parts;

[0137] Bisphenol F type epoxy resin 170, 100 parts;

[0138] Reactive diluent, 5 parts;

[0139] Filler, 200 parts;

[0140] Thixotropic agent, 2 parts;

[0141] Coupling agent, 0.5 parts;

[0142] (ii) The preparation steps include:

[0143] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0144] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0145] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0146] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0147] Comparative Example 2

[0148] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0149] "Island structure" toughening agent, 0 parts;

[0150] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.3 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0151] Bisphenol F type epoxy resin 170, 100 parts;

[0152] Reactive diluent, 5 parts;

[0153] Filler, 200 parts;

[0154] Thixotropic agent, 2 parts;

[0155] Coupling agent, 0.5 parts;

[0156] (ii) The preparation steps include:

[0157] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0158] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0159] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0160] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0161] Comparative Example 3

[0162] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0163] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0164] Grafted rubber particle toughening agent, 0 parts;

[0165] Bisphenol F type epoxy resin 170, 100 parts;

[0166] Reactive diluent, 5 parts;

[0167] Filler, 200 parts;

[0168] Thixotropic agent, 2 parts;

[0169] Coupling agent, 0.5 parts;

[0170] (ii) The preparation steps include:

[0171] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0172] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0173] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0174] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0175] Comparative Example 4

[0176] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0177] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 3000), 60 parts;

[0178] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.4 mol / 100g; rubber particle size is 500 nm), 40 parts;

[0179] Bisphenol A type epoxy resin E54, 100 parts;

[0180] Reactive diluent, 5 parts;

[0181] Filler, 200 parts;

[0182] Thixotropic agent, 2 parts;

[0183] (ii) The preparation steps include:

[0184] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0185] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0186] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0187] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0188] Comparative Example 5

[0189] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0190] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=0, n=0; liquid nitrile rubber with molecular weight of 3000), 10 parts;

[0191] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.3 mol / 100g; rubber particle size is 500 nm), 5 parts;

[0192] Bisphenol F type epoxy resin 170, 100 parts;

[0193] Reactive diluent, 10 parts;

[0194] Filler, 200 parts;

[0195] Thixotropic agent, 2 parts;

[0196] Coupling agent, 0.5 parts;

[0197] (ii) The preparation steps include:

[0198] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0199] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0200] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0201] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0202] Comparative Example 6

[0203] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0204] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0205] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.9 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0206] Bisphenol A type epoxy resin E54, 100 parts;

[0207] Reactive diluent, 5 parts;

[0208] Filler, 200 parts;

[0209] Thixotropic agent, 2 parts;

[0210] Coupling agent, 0.5 parts;

[0211] (ii) The preparation steps include:

[0212] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0213] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0214] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0215] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0216] Comparative Example 7

[0217] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0218] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=0, n=0; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0219] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.05 mol / 100g; rubber particle size is 500 nm), 30 parts;

[0220] Bisphenol F type epoxy resin 170, 100 parts;

[0221] Reactive diluent, 10 parts;

[0222] Filler, 200 parts;

[0223] Thixotropic agent, 2 parts;

[0224] Coupling agent, 0.5 parts;

[0225] (ii) The preparation steps include:

[0226] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0227] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0228] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0229] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0230] Comparative Example 8

[0231] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0232] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0233] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.3 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0234] Bisphenol A type epoxy resin E54, 100 parts;

[0235] Reactive diluent, 5 parts;

[0236] Filler, 200 parts;

[0237] Thixotropic agent, 2 parts;

[0238] Coupling agent, 0.5 parts;

[0239] (ii) The preparation steps include:

[0240] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0241] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0242] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0243] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0244] Comparative Example 9

[0245] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0246] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0247] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.5 mol / 100g; rubber particle size is 50 nm), 20 parts;

[0248] Bisphenol F type epoxy resin 170, 100 parts;

[0249] Reactive diluent, 5 parts;

[0250] Filler, 200 parts;

[0251] Thixotropic agent, 2 parts;

[0252] Coupling agent, 0.5 parts;

[0253] (ii) The preparation steps include:

[0254] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0255] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0256] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0257] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0258] Comparative Example 10

[0259] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0260] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=2, n=2; liquid nitrile rubber with molecular weight of 3000), 30 parts;

[0261] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.5 mol / 100g; rubber particle size is 2000 nm), 20 parts;

[0262] Bisphenol F type epoxy resin 170, 100 parts;

[0263] Reactive diluent, 5 parts;

[0264] Filler, 200 parts;

[0265] Thixotropic agent, 2 parts;

[0266] Coupling agent, 0.5 parts;

[0267] (ii) The preparation steps include:

[0268] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0269] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0270] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0271] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0272] Comparative Example 11

[0273] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0274] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=10, n=10; liquid nitrile rubber with molecular weight of 5000), 30 parts;

[0275] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.4 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0276] Bisphenol F type epoxy resin 170, 100 parts;

[0277] Reactive diluent, 5 parts;

[0278] Filler, 200 parts;

[0279] Thixotropic agent, 2 parts;

[0280] Coupling agent, 0.5 parts;

[0281] (ii) The preparation steps include:

[0282] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0283] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0284] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0285] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0286] Comparative Example 12

[0287] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0288] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 5000), 30 parts;

[0289] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.4 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0290] Bisphenol F type epoxy resin 170, 100 parts;

[0291] Reactive diluent, 5 parts;

[0292] Filler, 50 parts;

[0293] Thixotropic agent, 2 parts;

[0294] Coupling agent, 0.5 parts;

[0295] (ii) The preparation steps include:

[0296] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0297] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0298] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0299] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0300] Comparative Example 13

[0301] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0302] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 5000), 30 parts;

[0303] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.4 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0304] Bisphenol F type epoxy resin 170, 100 parts;

[0305] Reactive diluent, 5 parts;

[0306] Filler, 600 parts;

[0307] Thixotropic agent, 2 parts;

[0308] Coupling agent, 0.5 parts;

[0309] (ii) The preparation steps include:

[0310] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0311] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0312] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0313] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0314] Comparative Example 14

[0315] (a) The mass fraction of component A in the high-performance epoxy joint adhesive for splicing precast concrete segments is:

[0316] "Island structure" toughening agent (including two parts of sulfur ether epoxy resin with molecular formula m=1, n=1; liquid nitrile rubber with molecular weight of 12000), 30 parts;

[0317] Grafted rubber particle toughening agent (epoxy value of terminally epoxy hyperbranched polyether is 0.4 mol / 100g; rubber particle size is 500 nm), 20 parts;

[0318] 100 parts of a mixture of bisphenol F type epoxy resin 170 and bisphenol A type epoxy resin E54;

[0319] Reactive diluent, 5 parts;

[0320] Filler, 200 parts;

[0321] Thixotropic agent, 2 parts;

[0322] Coupling agent, 0.5 parts;

[0323] (ii) The preparation steps include:

[0324] (1) After weighing the raw materials according to the mass ratio of component A, epoxy resin, toughening agent, reactive diluent and coupling agent are added to the container in sequence for dispersion and mixing. After mixing evenly, filler is added to the container in batches and stirred. Finally, thixotropic agent is added and dispersed evenly. The vacuum degree, stirring rate and stirring time are controlled during stirring to obtain component A.

[0325] (2) Component B is an amine curing agent. Various types of amine curing agents, fillers and stabilizers are mixed and dispersed evenly under a certain vacuum, stirring rate and stirring time to obtain component B.

[0326] (3) Fill and package component A and component B separately to obtain two-component joint adhesive.

[0327] (4) When preparing test samples, mix components A and B, and after mixing evenly, mold them in the corresponding molds. After curing at room temperature for 21 days, perform performance tests.

[0328] Effect description:

[0329] The colloids prepared in Examples 1-8 and Comparative Examples 1-14 were tested for compressive strength, flexural strength, shear strength, and fracture energy. The test methods and technical requirements for compressive strength, flexural strength, and shear strength were based on T / CECS10080-2020 "Epoxy Adhesives for Precast Segment Assembly". The test results are shown in Table 1.

[0330] Table 1. Performance test results of the colloids prepared in Examples 1-8 and Comparative Examples 1-14

[0331] project Compressive strength (MPa) Bending strength (MPa) Shear strength (MPa) Fracture energy (N / m) Remark Example 1 83 57 17 980 Modulus meets standard Example 2 85 60 18 1205 Modulus meets standard Example 3 80 55 15 950 Modulus meets standard Example 4 84 58 18 1010 Modulus meets standard Example 5 84 58 18 1130 Modulus meets standard Example 6 79 57 14 935 Modulus meets standard Example 7 82 61 18 998 Modulus meets standard Example 8 81 58 18 997 Modulus meets standard Comparative Example 1 53 23 8 490 Modulus not up to standard Comparative Example 2 57 30 12 630 Modulus not up to standard Comparative Example 3 68 36 12 690 Modulus not up to standard Comparative Example 4 44 60 18 830 Modulus not up to standard Comparative Example 5 74 30 10 603 Modulus not up to standard Comparative Example 6 90 33 12 701 Modulus meets standard Comparative Example 7 70 32 11 687 Modulus not up to standard Comparative Example 8 / / / / Unable to prepare samples normally Comparative Example 9 80 46 14 720 Modulus meets standard Comparative Example 10 83 40 13 680 Modulus meets standard Comparative Example 11 70 45 13 640 Modulus not up to standard Comparative Example 12 51 26 9 576 Modulus not up to standard Comparative Example 13 / / / / Unable to prepare samples normally Comparative Example 14 52 25 8 550 Modulus not up to standard

[0332] As can be seen from the data in Table 1, the joint adhesives prepared in Examples 1-8 have significant advantages in comprehensive mechanical properties compared with the comparative examples, especially in terms of fracture energy, which can effectively improve the fatigue resistance and durability of the joint adhesives and ensure reliable long-term performance.

[0333] Compared with Comparative Examples 1-3, Example 1 demonstrates that the dual toughening effect of the "island-structure" toughening agent and the grafted rubber particle toughening agent plays a crucial role. In Comparative Example 1, the absence of a toughening agent significantly impacts the flexural, shear, and fracture energy properties of the colloid. In Comparative Examples 2-3, the addition of either the "island-structure" toughening agent or the grafted rubber particle toughening agent has limited impact on the overall mechanical properties of the colloid. The "island-structure" toughening agent, composed of one or more of bisphenol sulfide epoxy resins and liquid nitrile rubber, exhibits significant impact toughening modification effects. The surface-grafted terminal epoxy hyperbranched polyether in the grafted rubber particle toughening agent increases the material's toughness while further enhancing the integrity of the rubber particles and the matrix resin through chemical bonds. Simultaneously, this submicron-sized grafted rubber particle and the micron-sized "island-structure" exhibit a multi-scale synergistic toughening effect, significantly improving the colloid's fracture energy while maintaining strength.

[0334] Compared with Examples 2-3, Comparative Examples 4-5 used too much or too little toughening agent. Adding too much toughening agent will lead to a decrease in the compressive strength of the colloid, while adding too little toughening agent will not improve the toughness of the colloid to a sufficient extent and will only increase the fracture energy to a limited extent.

[0335] Compared to Examples 2-3, Comparative Examples 6-7 used grafted rubber particle toughening agents with excessively high or low epoxy values ​​of terminally epoxy hyperbranched polyethers. When the epoxy value of the terminally epoxy hyperbranched polyether is too high, the degree of cross-linking between the rubber particles and the epoxy matrix is ​​too great, resulting in high material rigidity and poor toughness. When the epoxy value of the terminally epoxy hyperbranched polyether is too low, the degree of cross-linking between the rubber particles and the epoxy matrix is ​​insufficient, limiting the improvement in toughening of the colloid.

[0336] Compared with Example 1, Comparative Example 8 used bisphenol A type epoxy resin E51. Due to the high viscosity of E51 resin (11000~14000 mPa·s at 25°C), it could not be mixed evenly during the preparation of component A of the joint adhesive, resulting in the inability to prepare a molded colloid and thus the inability to test the relevant properties normally.

[0337] Compared with Examples 4-5, Comparative Examples 9-10 used grafted rubber particle toughening agents with excessively large or small rubber particle sizes. If the rubber particle size is too large, it cannot effectively transfer and absorb energy, resulting in limited toughening effect. If the rubber particle size is too small, it is prone to aggregation and has poor dispersibility, failing to achieve a good synergistic toughening effect and having an insignificant effect on improving the performance of the colloid.

[0338] Compared to Example 6, Comparative Example 11 used a "sea-island structure" toughening agent composed of bisphenol sulfide epoxy resin with excessively large m and n values. When the m and n values ​​are too large, the compatibility between the two phases is improved during the curing reaction of the two-component epoxy resin, the overall phase separation degree decreases, and the impact toughening effect is reduced.

[0339] Compared to Example 6, the filler addition amounts in Comparative Examples 12-13 were either too high or too low. Compared to other types of adhesives, epoxy jointing adhesives for precast concrete segments have practical requirements for high strength and high modulus. When the filler addition amount is too high, it cannot be uniformly mixed during the preparation of component A of the jointing adhesive, resulting in the inability to prepare a properly formed colloid and thus making it impossible to test the relevant properties normally; however, if the filler ratio is too low, it will result in a low compressive elastic modulus of the cured colloid, which cannot meet the high modulus (≥8000MPa) requirements of high-performance jointing adhesives in practical applications and relevant standards.

[0340] Compared with Example 7, Comparative Example 14 used a toughening agent composed of nitrile rubber with an excessively high molecular weight. The molecular weight of liquid nitrile rubber is usually no more than 10,000. An excessively high molecular weight will result in excessive viscosity, poor colloid flowability, and inability to mix well with the resin matrix, making it difficult to achieve a synergistic toughening effect. The overall mechanical properties of the colloid are poor, and the fracture energy is low.

[0341] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments without departing from the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-performance epoxy joint adhesive for splicing precast concrete segments, characterized in that, The composite toughening agent utilizes a "sea-island structure" toughening agent and a grafted rubber particle toughening agent. The "sea-island structure" toughening agent is a bisphenol sulfide epoxy resin and liquid nitrile rubber, with the "sea-island structure" formed during the in-situ phase separation process caused by the curing of the two-component epoxy resin. The grafted rubber particle toughening agent consists of rubber particles grafted with terminal epoxy-terminated hyperbranched polyethers. These rubber particles are one or more of submicron-sized acrylonitrile-butadiene-styrene (ABS) copolymers and butadiene-styrene (SBR) copolymers. The particle size of the rubber particles is between 200 nm and 800 nm. The bisphenol sulfide epoxy resin has the following general formula: ； In the formula, 0≤m≤2, 0≤n≤2, and m and n are both positive numbers; The molecular weight range of the liquid nitrile rubber is 900~5000; the epoxy value of the terminal epoxy hyperbranched polyether is 0.3mol / 100g~0.5mol / 100g; The joint adhesive contains two components, A and B. By mass, component A consists of the following components: 20-50 parts of "island structure" toughening agent, 10-30 parts of grafted rubber particle toughening agent, 80-120 parts of epoxy resin, 1-15 parts of reactive diluent, 80-220 parts of filler, 0.5-10 parts of thixotropic agent, and 0.1-5 parts of coupling agent; the epoxy resin is bisphenol F type epoxy resin 170.

2. The high-performance epoxy joint adhesive for splicing precast concrete segments according to claim 1, characterized in that, The phase separation size of the "island" in the "island structure" toughening agent is between 5 μm and 50 μm.

3. The high-performance epoxy joint adhesive for splicing precast concrete segments according to claim 1, characterized in that, The fracture energy of the cured colloid is ≥900N / m.

4. The application of the high-performance epoxy jointing adhesive for splicing precast concrete segments as described in claim 1 in precast concrete bridge segment assembly projects.

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