CN-121975472-A - Interface bonding material for concrete repair and preparation method and application thereof

CN121975472ACN 121975472 ACN121975472 ACN 121975472ACN-121975472-A

Abstract

The invention belongs to the technical field of concrete repair, and particularly relates to an interface bonding material for concrete repair and a preparation method and application thereof. The interface bonding material for concrete repair comprises, by mass, 5-15 parts of functionalized graphene, 8-12 parts of humidity-responsive polymer, 4-8 parts of temperature-responsive polymer, 3-5 parts of pH-responsive polymer, 30-35 parts of epoxy resin matrix, 10-15 parts of modified acrylic resin, 2-3 parts of coupling agent and 3-5 parts of nano reinforcing agent, and B part of modified amine curing agent, wherein the functionalized graphene is graphene with at least one of carboxyl, amino and hydroxyl on the surface. The interface bonding material for concrete repair has good environmental adaptability and good bonding and impermeability.

Inventors

PANG BO
ZHAO LINGLING
SUN PEIFENG
Luan Congqi
GAO JIANGUO
SONG XIAOYUN
ZHANG WEI
LIU LIRONG

Assignees

青岛理工大学
江苏启青新型材料科技有限公司
青岛中惠青实业发展有限公司

Dates

Publication Date: 20260505
Application Date: 20251220

Claims (9)

1. The interface bonding material for repairing concrete is characterized by comprising the following components in parts by weight: the component A comprises 5-15 parts of functionalized graphene, 8-12 parts of humidity response polymer, 4-8 parts of temperature response polymer, 3-5 parts of pH response polymer, 30-35 parts of epoxy resin matrix, 10-15 parts of modified acrylic resin, 2-3 parts of coupling agent and 3-5 parts of nano reinforcing agent; the component B is a modified amine curing agent; The functionalized graphene is graphene with at least one of carboxyl, amino and hydroxyl on the surface.
2. The interface bonding material for concrete repair according to claim 1, wherein the functionalized graphene comprises carboxylated graphene, aminated graphene and reduced graphene oxide in a mass ratio of (40-60): 20-40): 10-30.
3. The interfacial bonding material for concrete repair of claim 1 wherein said moisture responsive polymer is prepared by a process comprising the steps of: H1, activating hydroxyl-terminated groups of polyethylene glycol by carbonyl diimidazole, and reacting for 4-6 hours at room temperature to obtain activated polyethylene glycol; H2, mixing an N-isopropyl acrylamide monomer, a 2-bromoisobutyric acid ester initiator, cuprous bromide, N, N, N ', N', N '' -pentamethyl diethylenetriamine and anhydrous toluene, and reacting for 6-8 hours at 22-28 ℃ under the protection of nitrogen to obtain a poly-N-isopropyl acrylamide prepolymer; h3, mixing activated polyethylene glycol with poly N-isopropyl acrylamide prepolymer, reacting for 10-14H at 55-65 ℃, then dialyzing and purifying, and freeze-drying to obtain the humidity response polymer.
4. The interfacial bonding material for concrete repair of claim 1 wherein said temperature responsive polymer is prepared by a process comprising the steps of: T1, mixing an N, N-dimethylaminoethyl methacrylate monomer, an azodiisobutyronitrile initiator and absolute ethyl alcohol, and reacting for 8-10 hours at 60-70 ℃ under the protection of nitrogen to obtain poly (N, N-dimethylaminoethyl methacrylate); And T2, reacting poly (N, N-dimethylaminoethyl methacrylate) with bromooctadecane under alkaline conditions for 24 hours at 75-85 ℃ to obtain the temperature response polymer containing the hydrophobic chain segment.
5. The interfacial bonding material for concrete repair of claim 1 wherein the pH-responsive polymer is prepared by a process comprising the steps of: P1, mixing an acrylic acid monomer, an azodiisobutyronitrile initiator and dioxane, and reacting for 5.5-6.5 hours at 65-75 ℃ under the protection of nitrogen to obtain a polyacrylic acid chain segment; P2, mixing an N-vinyl pyrrolidone monomer, an azodiisobutyronitrile initiator and dimethyl sulfoxide, and reacting for 7.5-8.5 hours at 60-70 ℃ under the protection of nitrogen to obtain a polyvinylpyrrolidone chain segment; and P3, performing carbodiimide coupling reaction on the polyacrylic acid chain segment and the polyvinylpyrrolidone chain segment, reacting for 45-50h at room temperature, and dialyzing and purifying to obtain the pH response polymer.
6. The interfacial bonding material for concrete repair according to claim 1, wherein the epoxy resin matrix is E-51 type epoxy resin, and the epoxy value is 0.48-0.54eq/100g; the modified acrylic resin is acrylic copolymer resin containing hydroxyl, and the hydroxyl value is 80-120mgKOH/g; The modified amine curing agent is polyoxypropylene diamine with an amine value of 300-400mgKOH/g; The coupling agent is gamma-aminopropyl triethoxysilane; The nanometer reinforcing agent is nanometer silicon dioxide, the grain diameter is 10-30nm, and the specific surface area is 150-250m 2 /g.
7. The interface bonding material for concrete repair of claim 1, wherein the mass ratio of functionalized graphene to humidity responsive polymer is 1:1-1:2; the mass ratio of the humidity response polymer to the temperature response polymer to the pH response polymer is (8-12): 4-8): 3-5; the mass ratio of the epoxy resin matrix to the modified acrylic resin is 2:1-3:1; the mass ratio of the component A to the component B is 100 (25-35).
8. The method for preparing an interfacial bonding material for concrete repair according to any one of claims 1 to 7, comprising the steps of: (1) Dispersing the functionalized graphene in a solvent, and performing ultrasonic dispersion to obtain a functionalized graphene dispersion liquid; (2) Adding a humidity response polymer, a temperature response polymer and a pH response polymer into the functionalized graphene dispersion liquid, and continuing ultrasonic dispersion; (3) Spin-evaporating the mixed solution obtained in the step (2) to remove the solvent, and then transferring the solvent into an epoxy resin matrix and modified acrylic resin, and stirring and mixing; (4) Adding a coupling agent and a nano reinforcing agent into the mixture obtained in the step (3), continuously stirring, vacuum defoaming, and cooling to room temperature to obtain a component A; (5) And taking the modified amine curing agent as a component B, mixing the component A and the component B, and stirring to obtain the interface bonding material for concrete repair.
9. Use of the interfacial bonding material for concrete repair according to any one of claims 1 to 7 in concrete structure repair.

Description

Interface bonding material for concrete repair and preparation method and application thereof Technical Field The invention belongs to the technical field of concrete repair, and particularly relates to an interface bonding material for concrete repair and a preparation method and application thereof. Background Along with the continuous expansion of the construction scale of the infrastructure and the extension of the service time in China, a large number of concrete structures have diseases such as cracks, leakage, denudation and the like under the action of complex and changeable environments. According to statistics, the existing building area in China exceeds 600 hundred million square meters, wherein about 40% of the buildings have quality problems of different degrees, and the maintenance and reinforcement requirements of concrete structures are increasingly urgent. Aiming at application scenes such as seepage prevention of an underground structure, bridge crack repair, tunnel lining defect treatment, water treatment facility protection, marine engineering structure corrosion prevention and the like, the research and development of the high-performance interface bonding repair material has important engineering value and social significance. At present, the concrete structure repair materials mainly comprise cement-based repair mortar, polymer repair mortar, epoxy resin repair materials and the like. Although the traditional cement-based repairing material has low cost and good compatibility with a base material, the traditional cement-based repairing material has the defects of shrinkage cracking, low interface bonding strength, poor impermeability and the like, and particularly has severely attenuated bonding performance during construction in a humid environment. The polymer repairing material has good bonding performance and flexibility, but has large difference of thermal expansion coefficient with the concrete base material, and is easy to generate interfacial stress concentration under the action of temperature change to cause bonding failure. Although the epoxy resin repairing material has high bonding strength and excellent impermeability, the epoxy resin repairing material has strict requirements on construction environment conditions, is difficult to cure under low-temperature, high-humidity or substrate moisture conditions, has greatly reduced bonding performance, and has large brittleness and poor impact resistance. In recent years, graphene has been widely focused on application in concrete repair materials due to its excellent mechanical properties, barrier properties and heat conducting properties. Research shows that the tensile strength, the impermeability and the durability of the repair material can be obviously improved by adding the graphene. However, the existing graphene modified repair material mainly uses graphene as a static reinforcing filler, and the potential of the graphene modified repair material in the aspect of interface regulation cannot be fully exerted. Meanwhile, the materials have poor adaptability to construction environments, and when environmental factors such as temperature, humidity, pH value and the like fluctuate greatly, the material performance is difficult to keep stable, so that the repairing effect is not ideal and the service life is short. Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art. Disclosure of Invention The invention aims to provide an interface bonding material for concrete repair, and a preparation method and application thereof, which are beneficial to solving or improving the problem that the repair effect of the existing repair material is greatly influenced by the environment. The interface bonding material for concrete repair comprises, by mass, 5-15 parts of functionalized graphene, 8-12 parts of humidity-responsive polymer, 4-8 parts of temperature-responsive polymer, 3-5 parts of pH-responsive polymer, 30-35 parts of epoxy resin matrix, 10-15 parts of modified acrylic resin, 2-3 parts of coupling agent and 3-5 parts of nano reinforcing agent, and B part of modified amine curing agent, wherein the functionalized graphene is graphene with at least one of carboxyl, amino and hydroxyl on the surface. Preferably, the functionalized graphene comprises carboxylated graphene, aminated graphene and reduced graphene oxide, and the mass ratio of the carboxylated graphene to the aminated graphene to the reduced graphene oxide is (40-60): 20-40): 10-30. Preferably, the humidity-responsive polymer is prepared by a method comprising the steps of activating hydroxyl-terminated polyethylene glycol with carbonyl diimidazole, reacting for 4-6 hours at room temperature to obtain activated polyethylene glycol, mixing an N-isopropyl acrylamide monomer, a 2-bromoisobutyrate initiator, cuprous bromide, N, N, N ', N ', N ' -pentamethyldiethylenetriamine and anhydrous toluene, reacting for