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Thermoplastic resin coated water-borne epoxy resin cement concrete crack self-repairing microcapsule and preparation method thereof

A water-based epoxy resin, self-healing microcapsule technology, applied in the field of concrete, can solve the problems of difficult rupture of the capsule wall, high capsule wall strength, and inability to release the internal repair agent, and achieve the effect of prolonging the service life.

Active Publication Date: 2018-09-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the application of this type of microcapsules in concrete is: due to the high strength of the capsule wall, when micro-cracks occur in the concrete, the capsule wall is difficult to break, so that the internal repair agent cannot be released, and it is difficult to achieve the purpose of crack self-healing

Method used

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  • Thermoplastic resin coated water-borne epoxy resin cement concrete crack self-repairing microcapsule and preparation method thereof
  • Thermoplastic resin coated water-borne epoxy resin cement concrete crack self-repairing microcapsule and preparation method thereof
  • Thermoplastic resin coated water-borne epoxy resin cement concrete crack self-repairing microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A thermoplastic resin-coated water-based epoxy resin type cement concrete crack self-repairing microcapsule, prepared as follows:

[0031] (1) Preparation of water-based epoxy resin microcapsules:

[0032] a. Take by weighing 30 parts of paraffin wax (melting point is 58~60 ℃), 5 parts of C9 petroleum resin, 65 parts of waterborne epoxy resin (solid content 48%);

[0033] b. Mix 30 parts of paraffin and 20 parts of perfluorotributylamine, heat to 70°C, and stir at 400-600rpm for 30 minutes to melt and disperse the paraffin in the perfluorotributylamine solution to obtain paraffin / perfluorotributylamine Amine mixture;

[0034] c. Add 5 parts of petroleum resin into a three-necked flask with a heating mantle, heat to 130-140°C, stir at a speed of 400-600rpm for 15 minutes, then add the above paraffin / perfluorotributylamine mixture into the three-necked flask, Control the temperature at 85°C and stir for 15 minutes; then add 65 parts of water-based epoxy resin into the t...

Embodiment 2

[0051] A thermoplastic resin-coated water-based epoxy resin type cement concrete crack self-repairing microcapsule, prepared as follows:

[0052] (1) The preparation of water-based epoxy resin microcapsules is roughly the same as in Example 1, except that: a. Weigh 55 parts of paraffin (melting point is 60-62° C.), 10 parts of C9 petroleum resin, and 35 parts of water-based epoxy resin (solid content 55%); b. 55 parts of paraffin and 40 parts of perfluorotributylamine are mixed, heated to 72 ° C, stirred at a speed of 400 to 600 rpm for 30 minutes, and the paraffin is melted and dispersed in the perfluorotributylamine solution, Obtain paraffin / perfluorotributylamine mixed solution;

[0053] (2) The preparation of solidifying agent microcapsules is roughly the same as in Example 1, except that: a. 60 parts of paraffin (melting point is 60~62° C.), 10 parts of C9 petroleum resin, and 30 parts of triethylenetetramine are weighed; b. .Mix 60 parts of paraffin and 40 parts of perf...

Embodiment 3

[0059] A thermoplastic resin-coated water-based epoxy resin type cement concrete crack self-repairing microcapsule, prepared as follows:

[0060] (1) The preparation of water-based epoxy resin microcapsules is roughly the same as in Example 1, except that: a. Weigh 42 parts of paraffin wax (fusing point is 52~54 ℃), 8 parts of C9 petroleum resin, and 50 parts of water-based epoxy resin (solid content 50%); b. 42 parts of paraffin and 30 parts of perfluorotributylamine are mixed, heated to 68 ° C, stirred at a speed of 400 to 600 rpm for 30 minutes, and the paraffin is melted and dispersed in the perfluorotributylamine solution, Obtain paraffin / perfluorotributylamine mixed solution;

[0061] (2) The preparation of solidifying agent microcapsules is roughly the same as in Example 1, except that: a. 55 parts of paraffin (fusing point is 52~54° C.), 8 parts of C9 petroleum resin, and 37 parts of triethylenetetramine are weighed; b. .Mix 55 parts of paraffin and 35 parts of perflu...

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Abstract

The invention belongs to the technical field of concrete and in particular relates to a thermoplastic resin coated water-borne epoxy resin cement concrete crack self-repairing microcapsule and a preparation method thereof. The microcapsule consists of water-borne epoxy resin microcapsule and a curing agent microcapsule, wherein the water-borne epoxy resin microcapsule consists of the following components in parts by weight: 30-55 parts of paraffin, 5-10 parts of a petroleum resin and 35-65 parts of a water-borne epoxy resin; the curing agent microcapsule consists of the following components inparts by weight: 35-60 parts of paraffin, 5-10 parts of a petroleum resin and 30-60 parts of a curing agent. In case of concrete cracks, the microcapsule is applied to an expanding crack, under the action of expansion force of the tip point of the crack, the wall of the microscopes can be easily broken, then the water-borne epoxy resin and the curing agent inside the microcapsule can flow out anddiffuse into the concrete crack, a curing reaction can be resulted, the crack can be then repaired, and thus the service life of concrete can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a thermoplastic resin-coated water-based epoxy resin type cement concrete crack self-repairing microcapsule and a preparation method thereof. Background technique [0002] Cement concrete is an important building material, which is widely used in industrial and civil buildings, bridges, tunnels, hydropower stations, ports, nuclear power stations and other projects. However, concrete itself is a porous and brittle material. Under the action of environmental stress, it is easy to produce microcracks inside and further expand to form cracks. Reaction and other damage will greatly reduce the service life of the concrete structure. [0003] In order to improve the durability and safety of cement concrete structures, cement concrete self-repair technology has received more and more attention. Concrete self-repair technologies mainly include: admixtures to promote self-re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/36B01J13/02
CPCB01J13/02C04B40/0046C04B24/36C04B24/24C04B24/281C04B24/121
Inventor 余剑英李颖薛理辉杜玮张莹谢君
Owner WUHAN UNIV OF TECH
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