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A thermoplastic resin-coated water-based epoxy resin type cement concrete crack self-healing microcapsule and its preparation method

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: 2020-04-21
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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  • A thermoplastic resin-coated water-based epoxy resin type cement concrete crack self-healing microcapsule and its preparation method
  • A thermoplastic resin-coated water-based epoxy resin type cement concrete crack self-healing microcapsule and its preparation method
  • A thermoplastic resin-coated water-based epoxy resin type cement concrete crack self-healing microcapsule and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0031] (1) Preparation of waterborne epoxy resin microcapsules:

[0032] a. Weigh 30 parts of paraffin wax (melting point 58-60°C), 5 parts of C9 petroleum resin, and 65 parts of water-based epoxy resin (solid content 48%);

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

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

Embodiment 2

[0051] A thermoplastic resin-coated waterborne epoxy resin type cement concrete crack self-healing microcapsule is prepared as follows:

[0052] (1) The preparation of water-based epoxy resin microcapsules is roughly the same as that of Example 1, except that: a. Weigh 55 parts of paraffin wax (melting point 60~62℃), 10 parts of C9 petroleum resin, and 35 parts of water-based epoxy resin (Solid content 55%); b. Mix 55 parts of paraffin wax with 40 parts of perfluorotributylamine, heat to 72°C, stir at 400~600rpm for 30min, melt and disperse the paraffin in the perfluorotributylamine solution, Obtain a paraffin / perfluorotributylamine mixture;

[0053] (2) The preparation of the curing agent microcapsules is roughly the same as that of Example 1, except that: a. Weigh 60 parts of paraffin wax (melting point 60-62°C), 10 parts of C9 petroleum resin, and 30 parts of triethylenetetramine; b .Mix 60 parts of paraffin wax with 40 parts of perfluorotributylamine, heat to 72°C, stir at 400...

Embodiment 3

[0059] A thermoplastic resin-coated water-based epoxy resin type cement concrete crack self-healing microcapsule is 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 (melting point 52~54°C), 8 parts of C9 petroleum resin, and 50 parts of water-based epoxy resin. (Solid content 50%); b. Mix 42 parts of paraffin wax with 30 parts of perfluorotributylamine, heat to 68°C, and stir at 400~600rpm for 30min to melt and disperse the paraffin in the perfluorotributylamine solution. Obtain a paraffin / perfluorotributylamine mixture;

[0061] (2) The preparation of the curing agent microcapsules is roughly the same as in Example 1, except that: a. Weigh 55 parts of paraffin wax (melting point 52~54°C), 8 parts of C9 petroleum resin, and 37 parts of triethylenetetramine; b .Mix 55 parts of paraffin wax with 35 parts of perfluorotributylamine, heat to 68℃, stir at 400~600...

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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 specifically 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 and is widely used in industrial and civil buildings, bridges, tunnels, hydropower stations, ports, nuclear power plants and other projects. However, the concrete itself is a porous and brittle material. Under the action of environmental stress, it is easy to produce micro-cracks inside, which further expand to form cracks, which not only causes a significant reduction in the bearing capacity of the concrete structure, endangers the structural safety, but also aggravates the chemical corrosion of the concrete and alkali aggregates. Reaction and other damage greatly reduce the service life of the concrete structure. [0003] In order to improve the durabili...

Claims

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Application Information

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Patent Type & Authority Patents(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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