Outer-repairing and inner-curing type graphene functionalization self-repairing microcapsule with cellular structure and preparation method of self-repairing microcapsule

A technology of self-healing microcapsules and cellular structures, which can be applied in the direction of microcapsule preparation, microsphere preparation, coating, etc., and can solve the problems of narrow application range of self-healing systems, poor thermochemical stability of microcapsules, and expensive graphene oxide, etc. , to improve the self-repair efficiency, the modification method is simple and easy to operate, and the effect of improving the repair efficiency

Active Publication Date: 2018-12-14
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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  • Outer-repairing and inner-curing type graphene functionalization self-repairing microcapsule with cellular structure and preparation method of self-repairing microcapsule
  • Outer-repairing and inner-curing type graphene functionalization self-repairing microcapsule with cellular structure and preparation method of self-repairing microcapsule
  • Outer-repairing and inner-curing type graphene functionalization self-repairing microcapsule with cellular structure and preparation method of self-repairing microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation method of the externally repaired and internally solidified graphene functionalized self-repairing microcapsules with a cellular structure comprises 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 u...

Embodiment 2

[0057] Different from Example 1, the preparation method of the externally repaired and internally 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 externally repaired and internally 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 functionalization self-repairing microcapsule with a cellular structure and a preparation method of the self-repairing microcapsule for the problem existing in a self-repairing system in the prior art. The outer-repairing and inner-curing type graphene functionalization self-repairing microcapsule comprises a capsule wall and a repairing agent coated by the capsule wall, wherein graphene is dispersed in the capsule wall; a series of micro-nano microcapsules are dispersed into the repairing agent, so as to form a cellular structure; a curing agent is coated ineach of the micro-nano microcapsules. The self-repairing microcapsule system has a micro-nano multinuclear coating structure, so that the stability of the microcapsule is enhanced, meanwhile, the contact probability of the repairing agent and the curing agent are increased, and the repairing efficiency is improved. Additionally, the capsule wall of the self-repairing microcapsule system is modified by silane, silane emulsion which is not hydrolysed after the microcapsule is ruptured can form a hydrophobic membrane in a capillary hole of concrete, and the water content can be prevented from being diffused further; in addition, silane emulsion which is hydrolysed can participate in the synthesis of a wall material, so that the property of the microcapsule is improved.

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 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 and the passage of time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02C09D7/40
CPCB01J13/02C09D7/70
Inventor 马衍轩张颖锐徐亚茜尹康樾王晓慧张群潘永赵家华
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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