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Preparation method of cement-based self-repairing material based on an oil-soluble amine microcapsule

A technology for repairing materials and microcapsules, applied in the directions of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve problems such as the repair effect cannot be excluded, and it is difficult to ensure storage stability.

Active Publication Date: 2021-05-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers mostly use water-soluble amines as epoxy resin curing agents, and it is difficult to guarantee their storage stability in cement-based materials. It cannot be ru

Method used

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  • Preparation method of cement-based self-repairing material based on an oil-soluble amine microcapsule
  • Preparation method of cement-based self-repairing material based on an oil-soluble amine microcapsule
  • Preparation method of cement-based self-repairing material based on an oil-soluble amine microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 1g SDBS to 100ml deionized water, place it in a constant temperature water bath at 60°C and stir to dissolve it as an aqueous phase solution. 4 g of dimethylthiotoluenediamine and 2 g of glyceryl monostearate were mixed, placed in a constant temperature water bath at 70°C with magnetic stirring, and dissolved as an oil phase solution. The fully dissolved oil phase solution was mixed with the water phase solution, emulsified at 300 rpm for 10 min, and the mass fraction of the oil phase in the emulsion was 5.6%. Add 150ml of deionized water to the emulsion, and at the same time add deionized water to the constant temperature water bath to lower the water temperature to room temperature, add 5g of ordinary Portland cement (P.O 42.5) to the cooled emulsion and continue stirring for 10min to obtain the product Wash with deionized water on a standard inspection sieve with a pore size of 125um until the aqueous solution is clarified, and air-dry to obtain dimethylthiotolue...

Embodiment 2

[0036] Add 2g SDBS into 100ml deionized water, place it in a constant temperature water bath at 60°C and stir to dissolve it as an aqueous phase solution. 12 g of dimethylthiotoluenediamine microcapsules were mixed with 4 g of glyceryl tristearate, placed in a constant temperature water bath at 70° C. and dissolved by magnetic stirring to form an oil phase solution. The fully dissolved oil phase solution was mixed with the water phase solution, emulsified at 600 rpm for 10 min, and the mass fraction of the oil phase in the emulsion was 13.6%. Add 150ml of deionized water to the emulsion, and simultaneously add deionized water to the constant temperature water bath to make the water temperature drop to room temperature, add 10g of ordinary Portland cement (P.O 42.5) to the cooled emulsion and continue to stir for 10min. A standard test sieve with a pore size of 125 μm was washed with deionized water until the aqueous solution was clarified, and air-dried to obtain dimethylthiot...

Embodiment 3

[0040]Add 3g SDBS to 100ml deionized water, place it in a constant temperature water bath at 60°C and stir to dissolve it as an aqueous phase solution. Mix 18g of dimethylthiotoluenediamine with 6g of glyceryl tristearate, place it in a constant temperature water bath at 70°C and stir it with magnetic force to dissolve it as an oil phase solution. The fully dissolved oil phase solution was mixed with the water phase solution, emulsified at 900 rpm for 10 min, and the mass fraction of the oil phase in the emulsion was 18.9%. Add 150ml of deionized water to the emulsion, and at the same time add cold water to the constant temperature water bath to lower the water temperature to room temperature, add 20g of ordinary Portland cement (P.O 42.5) to the cooled emulsion and continue stirring for 10min. Washing with water for 4-5 times, air drying to obtain dimethylthiotoluenediamine microcapsules.

[0041] Mix deionized water, poly(ethylene-alt-maleic anhydride), urea, ammonium chlor...

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Abstract

The invention discloses a preparation method of a cement-based self-repairing material based on oil-soluble amine microcapsules, and belongs to the field of cement-based self-repairing materials. According to the preparation method of the cement-based self-repairing material based on the oil-soluble amine microcapsule, the oil-soluble amine microcapsule takes dimethylthiotoluenediamine as a core material and glyceryl tristearate as a wall material. The preparation method is simple, and the microcapsule is spherical and has good dispersibility. After the cement-based self-repairing material prepared by compounding with epoxy resin microcapsules and ordinary Portland cement is cured for 28 days, the compressive strength repairing rate reaches 31% when the pre-pressing degree is 80%, and the cement-based self-repairing material has an obvious self-repairing effect and can be applied to cement-based components and structures.

Description

technical field [0001] The invention relates to the field of cement-based self-repairing materials, and relates to a preparation method of cement-based self-repairing materials based on oil-soluble amine microcapsules. Background technique [0002] Cement-based materials are currently the most widely used building materials. Their biggest disadvantage is their high brittleness. During service, micro-cracks are easily generated inside, which accelerates the erosion of harmful ions and shortens the service life of reinforced concrete structures. For a long time, the repair of cracks in cement-based materials has been one of the important topics studied by the academic and engineering circles at home and abroad. As a new method of crack repair, the self-repair technology of cement-based materials can effectively solve the complicated and expensive traditional repair methods. and time-limited questions. Microcapsule technology is one of the effective methods to achieve self-hea...

Claims

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Application Information

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IPC IPC(8): C04B24/20C04B28/04
CPCC04B40/0039C04B28/04C04B24/20C04B24/16C04B24/045C04B24/281C04B2103/302C04B16/0641Y02W30/91
Inventor 崔素萍马文旭孙大伟毛倩瑾王子明
Owner BEIJING UNIV OF TECH
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