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External repair and internal solid self-repairing microcapsules with cellular structure and preparation method thereof

A self-healing microcapsule and cell-like structure technology, applied in the field of organic composite materials, can solve problems such as easy deactivation, inability to effectively fill cracks, and easy rupture, so as to reduce the probability of rupture, improve self-healing efficiency, and improve mechanical properties Effect

Active Publication Date: 2021-01-15
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, self-healing microcapsules with a micron-scale structure are prone to cracking during the mixing and vibration of the concrete test block, resulting in a small number of remaining microcapsules in the concrete, which cannot respond to cracks in time

Method used

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  • External repair and internal solid self-repairing microcapsules with cellular structure and preparation method thereof
  • External repair and internal solid self-repairing microcapsules with cellular structure and preparation method thereof
  • External repair and internal solid self-repairing microcapsules with cellular structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of the self-healing microcapsule with external repair and internal solidification with cellular structure comprises the following steps:

[0038] (1) Preparation of oil-in-water silane emulsion 1:

[0039] (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.

[0040] (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;

[0041] (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 uniform and stable oil-in-w...

Embodiment 2

[0053] Different from Example 1, the preparation method of the externally repaired and internally solidified self-repairing microcapsules with a cellular structure comprises the following steps:

[0054] (1) Preparation of oil-in-water silane emulsion 1:

[0055] (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.

[0056] (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;

[0057] (1c) Gradually drop the oil phase into the water phase, the weight ratio of the oil phase to the water phase is 1:1.4, and stir at 8000rp...

Embodiment 3

[0069] Different from Example 1, the preparation method of the externally repaired and internally solidified self-repairing microcapsules with a cellular structure comprises the following steps:

[0070] (1) Preparation of oil-in-water silane emulsion 1:

[0071] (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.

[0072] (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;

[0073] (1c) Gradually drop the oil phase into the water phase, the weight ratio of the oil phase to the water phase ...

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Abstract

The invention provides a silane functionalized self-repair microcapsule with a cellular structure and a preparation method of the self-repair microcapsule aiming at the problems existing in the priorart in the self-repair system. The external repairing and internal curing type self-repair microcapsule with the cellular structure comprises a capsule wall and a repair agent coated by the capsule wall, wherein a series of micro / nano level microcapsules are dispersed in the repair agent so as to form the cellular structure; and the curing agent is coated in the micro / nano level microcapsules. Theexternal repairing and internal curing type self-repair microcapsule system has a micro / nano level multi-core coating structure, so that the stability of the microcapsules is increased, the contact probability of the repair agent and the curing agent is increased, and the repair efficiency is improved. In addition, the capsule wall of the self-repair microcapsule system is modified by silane, unhydrolyzed silane emulsion can form a hydrophobic membrane in capillary holes of the concrete after microcapsule rupture, and further dispersion of moisture is inhibited. Moreover, the hydrolyzed silane emulsion can participate in synthesis of the wall material, and the performance 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 silane-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 a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42
CPCC04B40/0039C04B24/42C04B24/32C04B24/28C04B24/125C04B24/045C04B24/02C04B24/2623C04B24/06C04B24/023C04B24/026C04B24/00C04B22/00C04B24/16C04B24/08C04B24/121C04B24/38
Inventor 马衍轩张颖锐徐亚茜张建鑫张群王晓慧吴睿乔广轩
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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