Graphene functional self-repairing microcapsule with a cellular structure and a preparation method thereof

A self-healing microcapsule and cellular structure technology, applied in the field of organic composite materials, can solve the problems of narrow application range of self-healing system, poor thermochemical stability of microcapsules, high price of graphene oxide, etc. The method is simple and easy to operate, and the effect of improving the repair efficiency

Active Publication Date: 2018-12-11
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single-wall microcapsule repair system has the following problems: (1) Microcapsules have poor thermochemical stability; (2) The reaction curing film forming speed is slow and cannot effectively fill the cracks; (3) The catalyst is expensive and easy to deactivate; The repair system has a narrow application range and can only be limited to certain substrates
However, the price of graphene oxide used in the above invention is relatively expensive, which limits the industrial production of this technology to a certain extent

Method used

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  • Graphene functional self-repairing microcapsule with a cellular structure and a preparation method thereof
  • Graphene functional self-repairing microcapsule with a cellular structure and a preparation method thereof
  • Graphene functional self-repairing microcapsule with a cellular structure and a preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A method for preparing internally repaired and externally solidified graphene functionalized self-repairing microcapsules with a cellular structure, comprising the following steps:

[0041] (1) Preparation of oil-in-water silane emulsion 1:

[0042] (1a) Weigh an appropriate amount of silane, emulsifier and dispersant, the weight ratio of silane, emulsifier and dispersant is 80:1:1, stir at room temperature at a speed of 2000rpm for 30min to obtain a uniformly dispersed oil phase; the silane It is vinyltriethoxysilane, the emulsifier is Op-10, and the dispersant is polyethylene glycol.

[0043] (1b) Weigh an appropriate amount of emulsifier Op-10 and water, the weight ratio of emulsifier and water is 1:110, and stir at 1400rpm at room temperature for 26min to obtain a composite water phase;

[0044] (1c) Gradually drop the oil phase into the water phase, the weight ratio of the oil phase to the water phase is 1:1.2, and stir at 7000rpm at 44°C for 4h to obtain a unifor...

Embodiment 2

[0057] Different from Example 1, the preparation method of the internally repaired and externally solidified graphene functionalized self-repairing microcapsules with a cellular structure comprises the following steps:

[0058] (1) Preparation of oil-in-water silane emulsion 1:

[0059] (1a) Weigh an appropriate amount of silane, emulsifier and dispersant, the weight ratio of silane, emulsifier and dispersant is 100:2:1, and stir at room temperature for 26min at a speed of 2400rpm to obtain a uniformly dispersed oil phase; the silane It is vinyltrimethoxysilane, the emulsifier is polyvinyl alcohol, and the dispersant is potassium citrate.

[0060] (1b) Weigh an appropriate amount of emulsifier polyvinyl alcohol and water, the weight ratio of emulsifier and water is 1:120, and stir at 1800rpm at room temperature for 22min to obtain a composite water phase;

[0061] (1c) Gradually drop the oil phase into the water phase, the weight ratio of the oil phase to the water phase is 1...

Embodiment 3

[0074] Different from Example 1, the preparation method of the internally repaired and externally solidified graphene functionalized self-repairing microcapsules with a cellular structure comprises the following steps:

[0075] (1) Preparation of oil-in-water silane emulsion 1:

[0076] (1a) Weigh an appropriate amount of silane, emulsifier and dispersant, the weight ratio of silane, emulsifier and dispersant is 120:2.5:1, and stir at room temperature for 22min at a speed of 2800rpm to obtain a uniformly dispersed oil phase; the silane It is isobutyltriethoxysilane, the emulsifier is sodium dodecylbenzenesulfonate, and the dispersant is sodium linoleate. .

[0077] (1b) Take an appropriate amount of emulsifier sodium dodecylbenzenesulfonate and water, the weight ratio of emulsifier and water is 1:105, and stir at 2200rpm at room temperature for 20min to obtain a composite water phase;

[0078] (1c) Gradually drop the oil phase into the water phase, the weight ratio of the oi...

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Abstract

The invention provides a graphene functional self-repairing microcapsule with a cellular structure and a preparation method thereof, aiming at the problems in a self-repairing system in the prior art,The internal repairing and external fixing graphene functional self-repairing microcapsule with the cellular structure consists of a capsule wall and a curing agent with which the capsule wall is covered, wherein graphene is dispersed in the capsule wall; a series of microcapsules of a micro-nano scale are dispersed in the curing agent to form a cellular structure; the insides of the microcapsules of the micro-nano scale are covered with a repairing agent. The self-repairing microcapsule system has a multi-core coating structure of a micro-nano scale, thereby improving the stability of the microcapsules, increasing the probability of contact between the repairing agent and the curing agent at the same time, and improving the repairing efficiency. In addition, the capsule wall of the self-repairing microcapsule system is modified by silane, an unhydrolyzed silane emulsion left after rupture of the microcapsules can form a hydrophobic film inside concrete capillary holes to prevent further diffusion of moisture, and the hydrolyzed silane emulsion can also participate in the synthesis of a wall material to improve the performance of the microcapsules.

Description

technical field [0001] The invention belongs to the field of organic composite materials and relates to a self-repairing material, in particular to a graphene functionalized self-repairing microcapsule with a cellular structure and a preparation method thereof. Background technique [0002] With the continuous development of society, the construction industry has also developed rapidly, and various high-rise buildings, bridges and roads have been dug up one after another. Concrete is widely used in the field of construction because of its wide range of sources, high compressive strength, easy construction and high durability. However, due to the inherent defects such as low tensile strength and high brittleness of concrete, microcracks are prone to occur due to changes in external loads and environmental temperature and humidity during construction and later service, which reduces its mechanical properties and affects the durability of the structure. With the change of load...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42
CPCC04B40/0039C04B14/024C04B24/42C04B24/125C04B2103/408C04B2103/0068
Inventor 马衍轩张颖锐徐亚茜周洁王晓慧张群王思文赵宇恒
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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