A kind of composite microcapsule, preparation method and application thereof

A composite microcapsule and reaction technology, which is applied in the field of self-repairing micro-cracks of shotcrete materials in coal mines, can solve problems such as affecting the strength and durability of concrete materials, destroying the structural integrity of matrix materials, and being difficult to repair internally, and achieves effective control of polycondensation. The effect of response speed, self-healing, and stability improvement

Active Publication Date: 2022-03-25
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This method of post repair or regular repair, grouting and filling treatment, is costly and prone to secondary cracking, which destroys the structural integrity of the matrix material and greatly affects the strength and durability of the concrete material.
And during the repair, only the cracks that can be seen by the naked eye can be targeted, and the micro-cracks inside the concrete cannot be detected for timely and effective repair.
[0004] Through the above analysis, the problems and defects of the existing technology are: the traditional repair method is to perform passive repair after cracks appear, the effect is not good and it is difficult to perform internal repair

Method used

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  • A kind of composite microcapsule, preparation method and application thereof
  • A kind of composite microcapsule, preparation method and application thereof
  • A kind of composite microcapsule, preparation method and application thereof

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preparation example Construction

[0037] Such as figure 1Shown, the preparation method of composite microcapsule provided by the invention may further comprise the steps:

[0038] S101: Mix melamine, phenol and formaldehyde solution evenly, adjust the pH value of the solution to 8-9 with triethanolamine, pour the above solution into a three-necked flask for reaction, set the reaction temperature to 70°C, and the stirring rate to 400-450rmp, After reacting for 1 h, cool to room temperature to obtain the first solution;

[0039] S102: Add the prepared epoxy resin diluent, emulsifier solution and sodium alginate solution to the first solution, mix evenly, set the reaction temperature to 50°C, and stir at 600rmp for 40min to form the second solution;

[0040] S103: Add a pH agent to the second solution, adjust it to about 2-3, and react for 1-2 hours, so that the wall material particles are deposited on the surface of the core material oil droplet and coated, and the microcapsule wall begins to form ;

[0041] ...

Embodiment 1

[0049] The preparation method of the composite microcapsules provided by the present invention weighs 6g of melamine, 16g of phenol and 26.4g of formaldehyde solution in a beaker and mixes them uniformly. After stirring for 1 h, it was cooled to room temperature to obtain a prepolymer solution. Weigh 40g of epoxy resin and 6g of ethyl acetate in a beaker and stir evenly, then add to the prepolymer solution, then add 1g of emulsifier solution and 6g of sodium alginate solution to the solution, at 50°C, at 600rmp Stir for 40 min to form an O / W solution. Adjust the pH of the O / W solution to about 2-3 with dilute sulfuric acid, react for 1-2 hours, and the microcapsule wall begins to form. Add an appropriate amount of distilled water dropwise, keep the reaction temperature constant, reduce the reaction speed to 400rmp, react for 1h, and the capsule walls of the microcapsules are gradually solidified. Filter and wash with distilled water for 2-3 times, and dry in a vacuum oven at...

Embodiment 2

[0051] The preparation method of the composite microcapsules provided by the present invention weighs 6g of melamine, 16g of phenol and 26.4g of formaldehyde solution in a beaker and mixes them uniformly. After stirring for 1 h, it was cooled to room temperature to obtain a prepolymer solution. Weigh 40g of epoxy resin and 7g of ethyl acetate in a beaker and stir evenly, then add to the prepolymer solution, then add 1g of emulsifier solution and 6g of sodium alginate solution to the solution, at 50°C, at 600rmp Stir for 40 min to form an O / W solution. Adjust the pH of the O / W solution to about 2-3 with dilute sulfuric acid, react for 1-2 hours, and the microcapsule wall begins to form. Add an appropriate amount of distilled water dropwise, keep the reaction temperature constant, reduce the reaction speed to 400rmp, react for 1h, and the capsule walls of the microcapsules are gradually solidified. Filter and wash with distilled water for 2-3 times, and dry in a vacuum oven at...

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Abstract

The invention belongs to the technical field of self-repairing micro-cracks of coal mine roadway shotcrete materials, and discloses a composite microcapsule, a preparation method and its application. The in-situ polymerization method is adopted to introduce sodium alginate into the polycondensation reaction process of melamine phenolic resin, and acetic acid is used Ethyl ester is used as a diluent to dilute the epoxy resin, and erucamide propyl dimethyl tertiary amine is used as an emulsifier to promote the composite wall material to coat the epoxy resin to form a shell with sodium alginate / melamine phenolic resin , Composite microcapsule material with epoxy resin as the core; Utilizing the adhesion of sodium alginate, it can effectively control the polycondensation reaction speed, improve the stability of the O / W emulsion system, make the wall material particles deposit uniformly and slowly, and prepare microcapsules The capsule particle size is smaller, the dispersion is more concentrated, and the coating rate is higher. The obtained microcapsules and curing agent are mixed into the main material of coal mine roadway shotcrete, and penetrate into the cracks under the action of siphon force to repair the damaged area and realize the self-repair of the matrix.

Description

technical field [0001] The invention belongs to the technical field of micro-crack self-repairing of coal mine roadway shotcrete materials, and in particular relates to a composite microcapsule, a preparation method and an application thereof. Background technique [0002] At present, coal, as the main energy source in our country, has an important strategic position in the national economic and social development. Reasonable and safe mining of coal mines is particularly important. Coal mines in my country are mainly mined underground, and a large number of tunnels need to be excavated underground for excavation and mining. The use of tunnel support to keep the tunnel smooth and the surrounding rock stable is of great significance to the construction and production of coal mines. With the continuous advancement of science and technology and the emergence of new materials, concrete or cement mortar has been used for roadway support, so that the concrete and surrounding rock ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02
CPCB01J13/02C08G14/10C04B40/0046C04B24/38C04B24/305C04B24/281C04B24/045C04B24/122C04B24/121
Inventor 周刚姜文静刘冬刘宗奇王存民孙健王钰颖牛琛茜薛轶方张欣远李帅龙
Owner SHANDONG UNIV OF SCI & TECH
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