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Self-repairing microcapsules for concrete, preparing method thereof and microcapsule self-healing coating

A technology of self-healing microcapsules and microcapsules, which is applied in the direction of microcapsule preparation, microsphere preparation, coating, etc., which can solve the problems of leakage of healing agent, affecting the workability and later strength of concrete, etc.

Inactive Publication Date: 2016-12-14
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this repair technology has the following technical problems: when the microcapsules are mixed with the concrete, the leakage of the healing agent is prone to occur, and the capsules embedded in the concrete will also affect the workability and later strength of the concrete itself.

Method used

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  • Self-repairing microcapsules for concrete, preparing method thereof and microcapsule self-healing coating
  • Self-repairing microcapsules for concrete, preparing method thereof and microcapsule self-healing coating
  • Self-repairing microcapsules for concrete, preparing method thereof and microcapsule self-healing coating

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preparation example Construction

[0050]The present invention provides a method for preparing self-repairing microcapsules for concrete described in the above technical solution, comprising the following steps:

[0051] Mix bis-3-methacryloxypropylated tetramethyldisiloxane and benzoin isobutyl ether with urea-formaldehyde to obtain a microcapsule system;

[0052] The microcapsule system is mixed with the water-in-oil solution for in-situ compounding, and the self-repairing microcapsules for concrete are obtained by separation.

[0053] The invention mixes bis-3-methacryloxypropylated tetramethyldisiloxane, benzoin isobutyl ether and urea-formaldehyde to obtain a microcapsule system. The present invention has no special requirements on the mixing sequence of the bis-3-methacryloxypropylated tetramethyldisiloxane, benzoin isobutyl ether and urea-formaldehyde, preferably bis-3-methylpropene A mixture of oxypropylated tetramethyldisiloxane and benzoin isobutyl ether was added to urea-formaldehyde.

[0054] Afte...

Embodiment 1

[0078] Add 98g of two-3-methacryloxypropylated tetramethyldisiloxane and 2g of benzoin isobutyl ether into urea-formaldehyde to obtain a microcapsule system; In the aqueous solution, wherein, the emulsifier in the oil-in-water solution is polysorbate, the content of the emulsifier is 3%, and the in-situ compounding is carried out at a stirring rate of 420r / min for 80min, and the belt speed is 1m / min, and the vacuum degree is 0.05 Vacuum permeation and separation for 60 minutes under the condition of Mpa to obtain self-healing microcapsules for concrete.

[0079] 69.60 g of isopropanol and 20.91 g of tetrahydrofuran were mixed, 60.00 g of tetraethyl orthosilicate and 40.00 g of poly(methylphenylsiloxane-dimethylsiloxane) were added to the mixture, and the resulting solution was heated to 80°C. Further, 15.76 g of distilled water and 3.65 g of 1N hydrochloric acid were added to the solution, and the resulting mixture was stirred at 80° C. for 30 minutes to induce a sol-gel reac...

Embodiment 2

[0084] Add 98g of two-3-methacryloxypropylated tetramethyldisiloxane and 2g of benzoin isobutyl ether into urea-formaldehyde to obtain a microcapsule system; In the aqueous solution, wherein, the emulsifier in the oil-in-water solution is polysorbate, the content of the emulsifier is 7%, and the in-situ compounding is carried out at a stirring rate of 450r / min for 60min, the belt speed is 3m / min, and the vacuum degree is 0.09 Under the condition of Mpa, vacuum infiltration and separation for 50 minutes, the self-healing microcapsules for concrete were obtained.

[0085] 69.60 g of isopropanol and 15 g of tetrahydrofuran were mixed, 55 g of ethyl orthosilicate and 35 g of poly(methylphenylsiloxane-dimethylsiloxane) were added to the mixture, and the resulting solution was heated to 80°C. Further, 15.76 g of distilled water and 3.65 g of 1N hydrochloric acid were added to the solution, and the resulting mixture was stirred at 80° C. for 30 minutes to induce a sol-gel reaction. ...

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Abstract

The invention provides a microcapsule self-healing coating. The microcapsule self-healing coating is prepared from microcapsules and a coating matrix preparation, wherein the mass ratio of the microcapsules to the coating matrix preparation is 1:(5-10). When the microcapsule self-healing coating is used, a user only needs to coat the surface of a concrete structure with the coating; when the surface of concrete is cracked, the microcapsules in the coating are broken accordingly, healing agents sealed in the microcapsules are irradiated by ultraviolet rays or sunlight through cracks, the living polymerization reaction of the coating is stimulated, and the cracks in the surface of the concrete are repaired. The experiment result indicates that the microcapsule self-healing coating has a good repairing effect on concrete, and the water absorption amount is only 0.4 g. In addition, as the microcapsule self-healing coating does not need to be co-stirred with the concrete, leakage of the healing agents can be avoided, and the peaceability and the later strength of concrete cannot be influenced.

Description

technical field [0001] The invention relates to the technical field of concrete self-healing, in particular to a self-healing microcapsule for concrete, a preparation method thereof and a microcapsule self-healing coating. Background technique [0002] Concrete is a brittle material. During use, under the action of external forces or other factors (temperature and humidity changes, uneven subsidence, etc.), micro-cracks or local damage will occur, allowing various erosive media to enter the interior through cracks on the concrete surface. , resulting in a vicious circle of concrete structures or component durability and mechanical properties decline, and in severe cases may even cause macroscopic cracks and brittle fractures, causing irreparable casualties and economic losses to the society. [0003] Most of the traditional repairing of cracks in concrete structures is carried out by post-event artificial repairing methods. However, the artificial repair method can only rep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/10C04B24/02C04B24/42C04B41/49B01J13/02C09D7/12
CPCB01J13/02C04B20/1022C04B24/023C04B24/42C04B41/009C04B41/457C04B41/4961C09D7/63C04B28/00
Inventor 张丽娜李凤臣余祥崔鹏飞胡逸捷舒婷郭耀文
Owner EAST CHINA UNIV OF TECH
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