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CN-122011674-A - Synthesis and preparation method of low-viscosity high-strength modified epoxy resin grouting material

CN122011674ACN 122011674 ACN122011674 ACN 122011674ACN-122011674-A

Abstract

The invention provides a low-viscosity high-strength modified epoxy resin grouting material, which mainly comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 2:1-3:1, carboxyl end-capped modified epoxy resin is adopted to introduce carboxyl groups with strong hydrophilicity and hydroxyl groups generated in the modification process into an epoxy resin molecular chain, so that the affinity of the epoxy resin grouting material to water molecules is greatly enhanced, hydrophilic groups of modified epoxy molecules extend into a water coating layer in a crack of a building body, the defect that the existing grouting material is not compatible with the water coating layer is overcome, a surfactant contains foam breaking polysiloxane components, particles can be uniformly dispersed in the mixture, a good dispersing effect is achieved, and the performance and the bonding strength of the epoxy resin grouting material are also improved by adding a silane coupling agent.

Inventors

  • LIU ZHEN
  • XIE XIAOCHENG

Assignees

  • 新余市力科达科技有限公司

Dates

Publication Date
20260512
Application Date
20251011

Claims (9)

  1. 1. The modified epoxy resin grouting material is characterized in that the sealant comprises an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 70-100 parts of carboxyl end-capped modified epoxy resin 20-30 Parts of reactive diluent 5-8 Parts of coupling agent 2-6 Parts of toughening agent 1-3 Parts of a surfactant; The component B comprises the following raw materials: 45-50 parts of modified polyamide 45-50 Parts of alicyclic amine 1-10 Parts of a curing accelerator.
  2. 2. The modified epoxy resin grouting material according to claim 1, wherein the carboxyl end-capped modified epoxy resin of the component A is dicarboxylic acid modified anionic hydrophilic epoxy resin with an epoxy value of 0.40-0.47, and in some embodiments, the raw material components adopted by the carboxyl end-capped modified epoxy resin during modification comprise dicarboxylic acid, bisphenol A epoxy resin and catalyst, and the mass fraction ratio of the dicarboxylic acid, the bisphenol A epoxy resin and the catalyst is 0.8:1:0.05.
  3. 3. The modified epoxy resin grouting material according to claim 1, wherein the dicarboxylic acid comprises at least one of oxalic acid, malonic acid, succinic acid, glutaric acid, azelaic acid, isophthalic acid, phthalic acid, terephthalic acid and dimethyl terephthalate; The bisphenol A epoxy resin comprises at least one of E-32, E42, E44, E51 and E55, preferably E44 or E51, and the catalyst comprises at least one of benzyl triethyl ammonium chloride, tetrabutyl ammonium bromide and 1-butyl-3 methylimidazole bromide, preferably benzyl triethyl ammonium chloride; The reactive diluent of the component A is aliphatic polyepoxy glycidyl ether, and comprises at least one of alkyl glycidyl ether, butyl glycidyl ether, benzyl glycidyl ether, polypropylene glycol diglycidyl ether, ethylene glycol diglycidyl ether, glycerol triglycidyl ether and butanediol diglycidyl ether, preferably benzyl glycidyl ether or polypropylene glycol diglycidyl ether; The coupling agent of the component A is a silane coupling agent containing epoxy groups or amino functional groups in the molecule, and comprises at least one of gamma-aminopropyl trimethoxy silane, gamma-aminopropyl triethoxy silane, 3-glycidoxypropyl trimethoxy silane, 3-glycidoxypropyl triethoxy silane and N, N-diethyl-3-aminopropyl trimethoxy silane, and the gamma-aminopropyl trimethoxy silane is preferable.
  4. 4. The modified epoxy resin grouting material according to claim 1, wherein the toughening agent of the component A is an active toughening agent, which comprises at least one of liquid polysulfide rubber, liquid nitrile rubber, liquid chloroprene rubber and liquid polyether, preferably liquid nitrile rubber.
  5. 5. The modified epoxy resin grouting material according to claim 1, wherein the surfactant of the A component is a low-foam and high-permeability nonionic surfactant comprising at least one of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester, polyoxyethylene alkylamine and polyoxyethylene alkylamide; In some embodiments, the raw material components adopted in the modification of the low-viscosity polyamide comprise diacid and polyamine, and the mass fraction ratio of the diacid to the polyamine is 1:2; The dibasic acid comprises at least one of oxalic acid, malonic acid, succinic acid, glutaric acid, azelaic acid, adipic acid, isophthalic acid, phthalic acid, terephthalic acid and benzoic acid, preferably adipic acid.
  6. 6. The modified epoxy resin grouting material according to claim 1, wherein the curing agent is polyamine, which comprises at least one of ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, dipropylenetriamine and triethylenediamine, preferably diethylenetriamine or triethylenetetramine.
  7. 7. The modified epoxy resin grouting material according to claim 1, wherein the alicyclic amine of the B component includes at least one of 1, 3-cyclohexanediamine, 4 , -diaminodicyclohexylmethane, cyclohexyldimethylamine and isophoronediamine, preferably 1, 3-cyclohexanediamine or isophoronediamine.
  8. 8. The modified epoxy resin grouting material of claim 1, wherein the curing accelerator of the B component comprises at least one of diethanolamine, triethanolamine, triethylamine, m-xylylenediamine, diamine phenylmethane and 2,4, 6-tris (dimethylaminomethyl) phenol, preferably triethanolamine or 2,4, 6-tris (dimethylaminomethyl) phenol.
  9. 9. The method for preparing the modified epoxy resin grouting material of claim 1, comprising the following steps: And S1, preparing carboxyl end-capped modified epoxy resin, namely adding bisphenol A epoxy resin with the required mass fraction and aqueous catalyst solution with the required mass fraction into a reaction kettle filled with toluene, heating and stirring at 65-70 ℃ for reaction for 2-3 hours, dissolving dicarboxylic acid with the required mass fraction into isopropanol with the same volume, uniformly mixing, adding into the reaction kettle, and heating and stirring at 65-70 ℃ for reaction for 0.5-1.5 hours to obtain prepolymer. Cooling to room temperature, standing and layering by methanol, removing the solvent, and vacuum drying to constant weight to obtain carboxyl end-capped modified epoxy resin; Step S2, preparing modified polyamide, namely adding adipic acid and triethylene tetramine with required mass fractions into a reaction kettle with a stirring device and a condensing device, gradually increasing the temperature to 180 ℃ and stirring at a constant speed for 1h, reacting at a constant temperature for 2h, slowly reducing the temperature to 50-60 ℃ when no distilled water is produced, continuing stirring and keeping the temperature for 1h, stopping heating, and cooling to room temperature to obtain low-viscosity polyamide; Step S3, preparing an epoxy resin grouting material A component (epoxy resin part), namely uniformly stirring and mixing the required mass parts of reactive diluent, coupling agent, toughening agent and surfactant with the carboxyl end-capped modified epoxy resin prepared in the step S1 to obtain the epoxy resin grouting material A component, and sealing and preserving the epoxy resin grouting material A component; And S4, preparing the component B (curing agent part) of the epoxy resin grouting material, namely uniformly stirring and mixing the alicyclic amine, the curing agent accelerator and the modified polyamide prepared in the step S2 according to the required mass fraction, and then obtaining the component B of the epoxy resin grouting material, and sealing and preserving.

Description

Synthesis and preparation method of low-viscosity high-strength modified epoxy resin grouting material Technical Field The invention relates to the technical field of building material chemical grouting, in particular to a structural reinforcement grouting material with epoxy resin in a humid environment and a preparation method thereof. Background While the construction of infrastructure such as cross-sea bridges, subway tunnels, highway culverts and the like provides power for the economic growth of China, the building repair investment is increasingly carried out. Cracking of concrete materials often occurs due to early shrinkage, thermal shrinkage or expansion, sedimentation, and unexpected overload. Cracks can compromise structural integrity, load bearing capacity, and durability, and allow water and other aggressive media to diffuse into the concrete matrix, leading to further crack development, rebar corrosion, and structural failure. The 'Qianli dyke is destroyed in ant cave', even the fine crack still can lead to the obvious improvement of the permeability of concrete, and the durability of the structure is greatly influenced. Grouting repair of cracks is the most effective method of reducing the permeability of a concrete matrix and restoring the load carrying capacity of the structure. However, the existing grouting materials are various in variety and have various uneven performances. (1) The water glass grouting material is water solution of soluble alkali metal silicate, and the solidified product SiO 2 can react with alkali oxide, so that the water glass grouting material is easy to be affected by acid-base corrosion and dry-wet circulation, has poor water resistance, alkali resistance and durability, and can not be used in a humid environment. (2) The acrylate grouting material has low crosslinking density and high elasticity after being cured, and has excellent deformation resistance. However, the cured product has poor rigidity and low strength, and is difficult to achieve the effect of structural reinforcement in the field of concrete crack repair. (3) The polyurethane grouting material is based on the reactivity of-NCO groups, releases a large amount of carbon dioxide gas after the curing reaction with concrete matrix or water in the air, and is easy to generate air holes in a glue layer or form defects at a polyurethane-concrete interface after curing. Resulting in a decrease in the mechanical strength and sealability of the polyurethane-concrete repair system, which adversely affects the durability of the concrete structure. (4) The epoxy resin grouting material has the advantages that the hydroxyl value of an epoxy curing system can be increased through the reaction of amino groups and epoxy groups, the bonding strength of the grouting material is improved, the viscosity of the epoxy resin grouting material is reduced through the reactive diluent, the grouting capacity of epoxy slurry is improved, the problem of organic gas release caused by the traditional reactive diluent is solved, in the epoxy-amine curing system, coupling agent molecules are introduced into a cross-linked network structure of epoxy resin, silane groups generated after the dehydration of siloxane groups are chemically reacted with hydration products of concrete to form Si-O-inorganic surfaces, so that covalent bond connection is formed between an organic epoxy curing material and an inorganic matrix, and the mechanical property of an epoxy-concrete interface is improved. Aiming at the defects of the traditional epoxy resin grouting material in terms of the organic repair of concrete and the repair of concrete cracks in a wet environment, a need exists for a modified epoxy resin grouting material which can effectively bond and solidify a wet concrete interface water-covering layer and permeate a building matrix. . Disclosure of Invention Based on the purpose, it is necessary to provide an epoxy resin grouting material for concrete cracks in a humid environment and a preparation method thereof, which are used for solving the problem that the existing grouting material cannot effectively repair the concrete crack surface with a water coating layer. The invention provides a low-viscosity high-strength modified epoxy resin grouting material which mainly comprises a component A and a component B, wherein the component A and the component B comprise the following raw materials in a mass ratio of 2:1-3:1 during use: the modified epoxy resin grouting material is characterized in that the sealant comprises an A component and a B component, wherein the A component comprises the following raw materials in parts by weight: 70-100 parts of carboxyl end-capped modified epoxy resin 20-30 Parts of reactive diluent 5-8 Parts of coupling agent 2-6 Parts of toughening agent 1-3 Parts of a surfactant; The component B comprises the following raw materials: 45-50 parts of modified polyamide 45-50 Parts of alicyclic amine 1-10 Parts of a