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Concrete self-healing microcapsules with physical trigger function and preparation method thereof

A technology of self-repairing microcapsules and concrete, applied in the field of concrete self-repair, can solve the problems affecting concrete strength and self-repair effect, achieve the effect of improving repair effect, reducing damage rate and improving matching performance

Active Publication Date: 2022-07-01
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the existing concrete microcapsules affect the concrete strength and self-repairing effect due to the high brittleness of the capsule wall material, thereby providing a concrete self-repairing function with a physical trigger function for repairing concrete cracks. repair microcapsules

Method used

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  • Concrete self-healing microcapsules with physical trigger function and preparation method thereof
  • Concrete self-healing microcapsules with physical trigger function and preparation method thereof

Examples

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Embodiment 1

[0034] This embodiment provides a concrete self-healing microcapsule, which includes a capsule core and a capsule wall, and the mass ratio of the capsule core and the capsule wall is 100:100. Its preparation method comprises the following steps:

[0035] (1) Preparation of capsule wall material solution

[0036] Weigh respectively methyl methacrylate 100 g, methyl acrylate 2.5 g, thioglycolic acid 0.57 g and azobisisobutyronitrile 1.03 g, and mix methyl methacrylate, methyl acrylate and thioglycolic acid to obtain mixed solution A; Dissolving azobisisobutyronitrile in 70 mL of xylene solvent to obtain solution B; then mixing mixed solution A and mixed solution B, heating to 60°C to carry out radical polymerization reaction to obtain capsule wall material solution C;

[0037] (2) Preparation of capsule core

[0038] Weigh 102 g of commercially available magnesia expansion agent, add an appropriate amount of ethanol and cellulose as a binder, and fully wet it to obtain a wet m...

Embodiment 2

[0042] This embodiment provides a concrete self-healing microcapsule, comprising a capsule core and a capsule wall, and the mass ratio of the capsule core and the capsule wall is 100:50. Its preparation method comprises the following steps:

[0043] (1) Preparation of capsule wall material solution

[0044] Weigh respectively methyl methacrylate 100g, methyl acrylate 5.5g, isopropanol 0.58g and benzoyl 1.06g, mix methyl methacrylate, methyl acrylate and isopropanol to obtain mixed solution A; Benzoyl was dissolved in 70 mL of xylene solvent to obtain solution B; then mixed solution A and mixed solution B were mixed, heated to 40° C. to carry out radical polymerization reaction, and solution C of capsule wall material was obtained;

[0045] (2) Preparation of capsule core

[0046] Weigh 210 g of commercially available calcium oxide expansion agent, add an appropriate amount of ethanol and cellulose as a binder, and fully wet it to obtain a wet material A, and extrude the wet ...

Embodiment 3

[0050] This embodiment provides a concrete self-healing microcapsule, which includes a capsule core and a capsule wall, and the mass ratio of the capsule core and the capsule wall is 100:150. Its preparation method comprises the following steps:

[0051] (1) Preparation of capsule wall material solution

[0052] Weigh respectively methyl methacrylate 100 g, methyl acrylate 12.5 g, mercaptopropionic acid 0.56 g and tert-butyl hydroperoxide 1.13 g, and mix methyl methacrylate, methyl acrylate and mercaptopropionic acid to obtain a mixed solution A; Dissolve tert-butyl hydroperoxide in 70 mL of xylene solvent to obtain solution B; then mix mixed solution A and mixed solution B, and heat to 60°C for radical polymerization to obtain capsule wall material solution C;

[0053] (2) Preparation of capsule core

[0054] Directly use commercially available sulfoaluminate expansion agent, and screen through a sieve to obtain 75 g of capsule core particles with a diameter of 0.1-0.2 mm; ...

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Abstract

The invention relates to the field of concrete self-healing, and discloses a concrete self-repairing microcapsule with a physical trigger function for repairing concrete cracks and a preparation method thereof. The microcapsule comprises a capsule core and a capsule wall, and the capsule wall material is The unsubstituted acrylate monomer and the methyl-substituted acrylate monomer are obtained by copolymerization. The concrete self-healing microcapsules of the present invention have good stability, and the flexibility transition temperature of the microcapsules can be adjusted by adjusting the ratio between different components of the capsule wall material, so as to be compatible with the temperature in the concrete hydration stage, and effectively It can reduce the damage rate of microcapsules in the preparation process of self-healing concrete, improve the repairing effect of microcapsules, and then improve the safety and durability of concrete structures, which has a good development prospect.

Description

technical field [0001] The invention relates to the field of concrete self-healing, in particular to a concrete self-repairing microcapsule with a physical trigger function for repairing concrete cracks and a preparation method thereof. Background technique [0002] As one of the most commonly used building materials in engineering, concrete has become the largest and most widely used building material due to its advantages of convenient material acquisition, economical cost and good moldability. With the development of engineering technology and the improvement of concrete performance, concrete materials are increasingly used in important parts of high-rise buildings, hydraulic projects, nuclear power projects and seaport projects. However, the concrete material is a porous and brittle material. Cracks and local damage will inevitably occur during use and under the influence of the surrounding environment. If these micro-damages cannot be repaired in time, it will not only ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B22/14C04B22/06C04B28/00C08F220/14
CPCC04B20/1033C04B28/00C08F220/14C04B22/066C04B24/02C04B24/383C04B22/064C04B22/142
Inventor 任骏王险峰邢锋韩宁旭李东风
Owner SHENZHEN UNIV
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