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Preparation method of crack self-repairing material for concrete

A technology for self-repairing materials and concrete, applied in the field of building materials, can solve problems such as poor repairing effect, and achieve the effects of good product performance, simple production and processing process, and improved comprehensive performance.

Pending Publication Date: 2019-10-01
游雪花
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The technical problem to be solved by the present invention: Aiming at the problem that the repairing effect of the existing crack repairing method is poor, a preparation method of a crack self-repairing material for concrete is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In parts by weight, weigh 30 parts of urea, 60 parts of formaldehyde, 24 parts of epoxy resin, 1 part of nonylphenol polyoxyethylene ether, 0.2 part of polydimethylsiloxane, 6 parts of ammonium chloride, 0.1 Parts of resorcinol, 180 parts of deionized water, epoxy resin and nonylphenol polyoxyethylene ether were added to deionized water, placed in a high-shear emulsifier, and stirred at a speed of 5000r / min for 30min at room temperature to obtain emulsified solution, add polydimethylsiloxane to the emulsion, place it in a high-shear emulsifier, and stir at 4000r / min for 10 minutes at room temperature to obtain an epoxy resin core material emulsion, add urea to formaldehyde, and Stir at a speed of 120r / min for 10min to obtain a urea-formaldehyde solution. Put the urea-formaldehyde solution in a water bath, add triethanolamine dropwise to adjust the pH to 8, stir and react at a speed of 300r / min in a water bath at 70°C for 1h, and keep warm. To obtain a urea-formaldehyde ...

Embodiment 2

[0047] In parts by weight, weigh 35 parts of urea, 70 parts of formaldehyde, 28 parts of epoxy resin, 2 parts of nonylphenol polyoxyethylene ether, 0.3 part of polydimethylsiloxane, 7 parts of ammonium chloride, 0.2 Parts of resorcinol, 210 parts of deionized water, epoxy resin and nonylphenol polyoxyethylene ether were added to deionized water, placed in a high-shear emulsifier, and stirred at a speed of 5500r / min for 35min at room temperature to obtain emulsified solution, add polydimethylsiloxane to the emulsion, place it in a high-shear emulsifier, and stir at 5000r / min for 15 minutes at room temperature to obtain an epoxy resin core material emulsion, add urea to formaldehyde, and Stir at a speed of 140r / min for 12min to obtain a urea-formaldehyde solution, place the urea-formaldehyde solution in a water bath, add triethanolamine dropwise to adjust the pH to 8, stir and react at a speed of 330r / min in a water bath at 75°C for 1h, keep warm, To obtain a urea-formaldehyde r...

Embodiment 3

[0049]In parts by weight, weigh 40 parts of urea, 80 parts of formaldehyde, 32 parts of epoxy resin, 3 parts of nonylphenol polyoxyethylene ether, 0.4 part of polydimethylsiloxane, 8 parts of ammonium chloride, 0.3 Parts of resorcinol, 240 parts of deionized water, epoxy resin and nonylphenol polyoxyethylene ether were added to deionized water, placed in a high-shear emulsifier, and stirred at a speed of 6000r / min for 40min at room temperature to obtain emulsified solution, add polydimethylsiloxane to the emulsion, place it in a high-shear emulsifier, and stir at 6000r / min for 20 minutes at room temperature to obtain an epoxy resin core material emulsion, add urea to formaldehyde, and Stir at a speed of 160r / min for 15min to obtain a urea-formaldehyde solution, place the urea-formaldehyde solution in a water bath, add triethanolamine dropwise to adjust the pH to 9, stir and react at a speed of 360r / min in a water bath at 80°C for 2h, keep warm, To obtain a urea-formaldehyde re...

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Abstract

The invention relates to a preparation method of a crack self-repairing material for concrete, belonging to the technical field of building materials. The crack self-repairing material for the concrete is prepared by adding epoxy resin coated urea-formaldehyde resin microcapsules, epoxy resin has strong adhesive force to the concrete and can effectively prevent the fracture of the concrete from expanding, an epoxy resin adhesive is a solid after curing and does not react with a urea-formaldehyde resin coating layer and the concrete, the epoxy resin adhesive-containing urea-formaldehyde resin microcapsules and a catalyst are dispersed in a composite material matrix, when the material generates a crack, stress concentration at the top of the crack causes the microcapsules to crack, a repairagent migrates to the crack by capillary siphon phenomenon to fill the crack and meet the catalyst added to the material, the core material undergoes physical and chemical changes to form good adhesion to complete the repair. Therefore, the self-repair polymer with the repair agent coated by the microcapsules can improve the service life of the concrete.

Description

technical field [0001] The invention relates to a preparation method of a crack self-repairing material for concrete, belonging to the technical field of building materials. Background technique [0002] Although concrete has a series of advantages such as high compressive strength, good durability, strong plasticity, strong environmental adaptability, and a wide range of materials, its own brittleness makes it inevitable to produce cracks and local cracks during molding construction and service. If these defects cannot be repaired in time, it will not only affect the strength and durability of concrete, but also affect the normal performance and service life of the building structure in severe cases. Therefore, the problem of concrete crack repair has become a research hotspot in academia and engineering circles. [0003] Cracks in concrete structures are the main cause of reduced mechanical properties and reduced durability of buildings. There are various reasons for cra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/32
CPCC04B26/32C04B2111/00672C04B2111/72C04B2201/50C04B24/307C04B24/281C04B14/106C04B14/327C04B18/26C04B24/2676C04B2103/608
Inventor 游雪花
Owner 游雪花
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