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Electromagnetically-induced self-repairing epoxy resin type microcapsule for cement concrete cracks and preparation method thereof

A technology of cement concrete and epoxy resin, which is applied in the field of concrete, can solve the problems of hard to break the capsule wall, difficult to realize the self-repair of cracks, and the inability to release the internal repair agent, so as to achieve the effect of prolonging the service life and strengthening the self-repair ability

Active Publication Date: 2018-08-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microcapsule self-healing technology has the advantage of fast repair speed, but the problem in its practical application is that when micro-cracks occur in concrete, the capsule wall is difficult to break, so that the internal repair agent cannot be released, making it difficult to realize crack self-healing

Method used

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  • Electromagnetically-induced self-repairing epoxy resin type microcapsule for cement concrete cracks and preparation method thereof
  • Electromagnetically-induced self-repairing epoxy resin type microcapsule for cement concrete cracks and preparation method thereof
  • Electromagnetically-induced self-repairing epoxy resin type microcapsule for cement concrete cracks and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Electromagnetically induced cement concrete crack self-healing epoxy resin microcapsules are prepared by the following method:

[0040] (1) Preparation of epoxy resin microcapsules:

[0041] a. Weigh 20 parts of paraffin wax (melting point: 58-60°C), 10 parts of WE-2 polyethylene wax (melting point: 100-103°C), 5 parts of C9 petroleum resin, 5 parts of 2000 mesh iron oxide powder, 52 parts of E-51 epoxy resin, 8 parts of reactive diluent;

[0042]b. Add 20 parts of paraffin wax into a three-necked flask with a heating mantle, heat the temperature to 75-80°C, stir at a speed of 400-600rpm for 30min, then add 10 parts of polyethylene wax into the three-necked flask, and raise the temperature to 120-130 ℃, stirring for 15 minutes to make it evenly mixed with paraffin wax; then add 5 parts of petroleum resin into a three-necked flask, raise the temperature to 130-140 ℃, stir for 15 minutes to make it evenly mixed with paraffin wax / polyethylene wax; finally put 5 parts Add...

Embodiment 2

[0063] Electromagnetically induced cement concrete crack self-healing epoxy resin microcapsules are composed of epoxy resin microcapsules and curing agent microcapsules, prepared as follows:

[0064] (1) The preparation of epoxy resin microcapsules is roughly the same as in Example 1, except that: a. Weigh 25 parts of paraffin wax (melting point is 60~62 ℃), WE-3 type polyethylene wax (melting point is 103~106 ℃) 10 parts, 7 parts of C9 petroleum resin, 5 parts of 1500 mesh carbonyl iron powder, 6 parts of reactive diluent, 47 parts of E-44 epoxy resin; b. 25 parts of paraffin was added to a three-necked flask with heating mantle, Heating temperature to 78~82℃;

[0065] (2) The preparation of curing agent microcapsules is roughly the same as in Example 1, the difference being: a. Weigh 27 parts of paraffin wax (melting point is 60~62 ℃), WE-3 type polyethylene wax (melting point is 103~106 ℃) ) 9 parts, 7 parts of C9 petroleum resin, 5 parts of 1500 mesh carbonyl iron powder,...

Embodiment 3

[0075] Electromagnetically induced cement concrete crack self-healing epoxy resin microcapsules are composed of epoxy resin microcapsules and curing agent microcapsules, prepared as follows:

[0076] (1) The preparation of epoxy resin microcapsules is roughly the same as in Example 1, except that: a. Weigh 30 parts of paraffin wax (melting point is 63~65 ℃), WE-N type polyethylene wax (melting point is 106~110 ℃) ℃) 10 parts, 7 parts of C9 petroleum resin, 8 parts of 200-mesh high-purity iron powder, 5 parts of reactive diluent, 40 parts of E-51 epoxy resin; b. Add 30 parts of paraffin into a three-necked flask with heating mantle, heat Temperature to 78~82℃;

[0077] (2) The preparation of solidifying agent microcapsules is roughly the same as in Example 1, except that: a. Weigh 30 parts of paraffin wax (melting point is 63~65°C), WE-N type polyethylene wax (melting point is 106~110°C) ) 10 parts, 7 parts of C9 petroleum resin, 8 parts of 200-mesh high-purity iron powder, 45...

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Abstract

The invention belongs to the technical field of concrete, and particularly relates to an electromagnetically-induced self-repairing epoxy resin type microcapsule for cement concrete cracks and a preparation method thereof. The microcapsule consists of an epoxy resin microcapsule body and a curing agent microcapsule body. According to the microcapsule and the preparation method thereof, a paraffin / petroleum resin / polyethylene wax / iron powder mixture serves as a capsule wall, and epoxy resin and a low-molecular polyamide curing agent serve as a capsule core of the microcapsule; and when concretegenerates the cracks, the propagation tip stress of part of the cracks is large, so that the capsule wall of the microcapsule can be broken, the epoxy resin or the low-molecular polyamide curing agent inside the capsule flows out and is diffused to enter the cracks, curing reaction is generated to form a cross-linked product, so that the cracks can be repaired in time, cracks which are not repaired in time can enable the capsule wall of the microcapsule to be heated and melted under the action of an applied electromagnetic field, and the epoxy resin or the low-molecular polyamide curing agentis diffused to enter the cracks, so that the cracks can be repaired. The epoxy resin microcapsule has the advantages of being capable of endowing the concrete with stronger crack self-repairing capability and capable of prolong the service life of the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to an electromagnetically induced cement concrete crack self-repairing epoxy resin microcapsule and a preparation method thereof. Background technique [0002] Cement concrete has become the most important building material because of its low cost, convenient use, and good durability. However, due to the insurmountable defects of concrete such as high brittleness and low tensile strength, cracks will inevitably occur during use, which will reduce the strength of concrete and affect the safety of structures. At the same time, cracks will become channels for corrosive substances in the environment to penetrate into the concrete, accelerating the chemical corrosion of concrete and the corrosion of internal steel bars, resulting in reduced durability of concrete and greatly shortening the service life of concrete. [0003] In order to avoid the reduction of concrete durabi...

Claims

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Application Information

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IPC IPC(8): C04B24/36B01J13/02
CPCB01J13/02C04B40/0046C04B24/36C04B24/2611C04B24/26C04B14/308C04B24/023C04B24/281C04B24/287C04B14/34C04B14/36
Inventor 余剑英李颖吴少鹏杜玮韩晓斌薛理辉
Owner WUHAN UNIV OF TECH
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