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A kind of water-based epoxy concrete repair interface agent and preparation method thereof

A water-based epoxy and water-based epoxy resin technology, applied in epoxy resin coatings, polyether coatings, coatings, etc., can solve problems such as poor adhesion and toughness, prolonged film formation time, and weakened bonding effect. To achieve the effect of durable interface bonding, improved bonding effect and mature preparation method

Active Publication Date: 2020-05-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when water-based epoxy is used alone, the water evaporates slowly, and the residual water often causes the film-forming time to be prolonged, and the film is blistered or sunken; the concrete material has the advantages of high strength and durability, but it has low tensile strength, cohesive force and Poor toughness and other shortcomings, if the two are combined, they can give full play to their respective advantages to make up for the shortcomings: cement hydration consumes water, promotes resin curing and increases the durability and aging resistance of the resin; resin can be used as a continuous phase to fill defects in concrete and porosity, forming a cross-linked network, improving tensile strength, cohesion and toughness
The current method of using the coupling agent is basically based on direct mixing or coating. The coupling agent is coated on the surface of old concrete, and a large amount of methanol or ethanol produced by the hydrolysis and dealcoholization of the surface hydroxyl groups will greatly affect the bonding surface. Cement hydration weakens the bonding effect, which is contrary to the original intention of cement-epoxy coupling

Method used

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  • A kind of water-based epoxy concrete repair interface agent and preparation method thereof
  • A kind of water-based epoxy concrete repair interface agent and preparation method thereof
  • A kind of water-based epoxy concrete repair interface agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] In order to illustrate the different effects of this product and commercially available silane coupling agents on cement hydration, P.II52.5 Portland cement is used, mixed with distilled water at a mass ratio of 1:5, and the hydration in the normal cement hydration process is measured. exothermic process and conductivity change, results such as figure 1 shown. Among them, the first exothermic peak of hydration (0-1500 minutes) is the exotherm of cement dissolving, and the conductivity rises rapidly; the second exothermic peak of hydration (1500-3000 minutes) is the exotherm of cement curing, due to the solution The ions drop down and the conductivity drops accordingly.

[0053] Add 10% mass percentage of silane coupling agent immediately after mixing the cement slurry with the same ratio, and test under the same system, the results are as follows figure 2 shown. It can be seen that the first exothermic peak of hydration decreases obviously, and the second exothermic...

Embodiment 2

[0069] A water-based epoxy concrete repair interface agent, the interface agent includes A component and B component in a mass ratio of 1:1.4, wherein:

[0070] A component includes the following components according to mass percentage:

[0071] Nano Silica Emulsion 30%;

[0072] Silane coupling agent 65%;

[0073] Water-based epoxy resin 5%;

[0074] B component includes the following components according to mass percentage:

[0075] Flexible polyetheramine 50%;

[0076] Diethyltoluenediamine 50%.

[0077] Its preparation method is as follows:

[0078] Weigh ultrafine silica fume (purity higher than 80wt.%) and distilled water in a closed container, stir at 100°C with a stirring frequency of 200rpm for 6h and mix evenly to prepare a nano-silica emulsion (nano-silica) with a mass fraction of 10%. The particle size of silicon oxide is less than 200nm); weigh ultrafine silica fume emulsion, γ-(2,3-glycidoxy)propyltriethoxysilane and cationic aqueous cyclo Oxygen resin was...

Embodiment 3

[0081] A water-based epoxy concrete repair interface agent, the interface agent comprises A component and B component according to the mass ratio of 1:1, wherein:

[0082] A component includes the following components according to mass percentage:

[0083] Nano Silica Emulsion 20%;

[0084] Silane coupling agent 60%;

[0085] Water-based epoxy resin 20%;

[0086] B component includes the following components according to mass percentage:

[0087] Flexible polyetheramine 40%;

[0088] Diethyltoluenediamine 60%.

[0089] Its preparation method is as follows:

[0090] Weigh silica sol (purity is higher than 80wt.%), distilled water is placed in airtight container, stirs 7h with stirring frequency 150rpm at 90 ℃ and mixes evenly, is prepared into the nano-silica emulsion (nano-silica) that mass fraction is 9%. The particle size is less than 200nm); Weigh the silica sol emulsion, 2-(3,4-epoxycyclohexyl) ethyltriethoxysilane and non-ionic water-based epoxy The resin was mixed...

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Abstract

The invention discloses a waterborne epoxy concrete repair interfacial agent and a preparation method thereof. The interfacial agent is prepared from a component A and a component B, wherein the component A, counted by mass percent, is prepared from 5 to 30 percent of nano silica emulsion, 50 to 65 percent of silane coupling agent and 5 to 45 percent of waterborne epoxy resin; the component B, counted by mass percent, is prepared from 30 to 50 percent of flexible polyetheramine and 50 to 70 percent of diethyltoluenediamine. The preparation method of the waterborne epoxy concrete repair interfacial agent comprises the following steps: firstly, mixing the nano silica emulsion, the silane coupling agent and the waterborne epoxy resin according to the proportions to obtain the component A; secondly, mixing the flexible polyetheramine with the diethyltoluenediamine according to the proportions to obtain the component B; thirdly, mixing the component A with the component B to obtain the interfacial agent. The repair interfacial agent is applied to the surface of old concrete to form a coupling interface component which is easy to dealcoholize; a relatively soluble hydration product is transformed into a more stable gel state, so that the bonding effect of a repair interface is improved; the product stability is good and the construction is simple and convenient.

Description

[0001] The invention relates to a water-based epoxy concrete repair interface agent and a preparation method thereof, belonging to the field of reinforcing agents for composite materials. Background technique [0002] With the prolongation of the service age, due to the effects of man-made and natural environment and other factors, the concrete structure will inevitably suffer from cracks, erosion, large-scale peeling off of the surface, and even collapse, which will seriously damage its safety and durability. The direct economic loss is as high as 300 billion yuan per year. Facing the severe situation of the continuous deterioration of existing concrete structures, repairing and strengthening has become an effective solution. [0003] Water-based epoxy resin is a stable dispersion system prepared by dispersing in the form of particles or droplets in a dispersion medium with water as the continuous phase. The preparation of water-based epoxy resin is divided into external emul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D171/00C09D7/61C09D7/65C09D7/63
CPCC08K2201/003C08K2201/011C09D7/61C09D7/63C09D7/65C09D7/67C09D163/00C09D171/00C08L71/00C08K3/36C08K5/5435C08L63/00
Inventor 张云升逄博
Owner SOUTHEAST UNIV