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Synergistic coating swelling migration resistance type microcapsule chloride ion curing agent as well as preparation method and application thereof

A microcapsule, chloride ion technology, applied in the field of reinforced concrete chloride ion curing agent, can solve the problems of low chloride ion migration resistance, easy corrosion of steel bars, etc., to reduce chloride ion migration medium, excellent swelling performance, and chloride ion resistance The effect of lasting and stable migration ability

Active Publication Date: 2022-04-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a kind of synergistically coated swelling and migration-resistant microcapsule chloride ion curing agent to solve the problem that the existing concrete has low resistance to chloride ion migration and causes the steel bars in the concrete to be easily corroded

Method used

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  • Synergistic coating swelling migration resistance type microcapsule chloride ion curing agent as well as preparation method and application thereof
  • Synergistic coating swelling migration resistance type microcapsule chloride ion curing agent as well as preparation method and application thereof
  • Synergistic coating swelling migration resistance type microcapsule chloride ion curing agent as well as preparation method and application thereof

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Embodiment 1

[0031] A kind of synergistic coating swelling retardation type microcapsule chloride ion curing agent, it specifically makes through the following steps:

[0032] 1) Preparation of Capsule A: In parts by weight, place a beaker containing a mixed solution of 20 parts of tetraethyl orthosilicate, 30 parts of deionized water and 40 parts of absolute ethanol on a magnetic stirrer and stir for 2 hours, then add 5 parts of part of aluminum alginate, continue to stir for 2 hours, then slowly drop in acetic acid to adjust the pH to 3.0, after stirring for 2 hours, slowly add ammonia water dropwise until the pH is 7.0, to produce silica sol, after aging for 2 hours, filter, wash with deionized water and place Dry in an oven at 50°C for 2 hours, crush and grind until all of them pass through a 1.5mm sieve to obtain aluminum alginate microcapsules coated with silica sol, namely A capsule.

[0033] 2) Preparation of Capsule B: In parts by weight, heat 80 parts of stearic acid to 55°C to m...

Embodiment 2

[0037] A kind of synergistic coating swelling retardation type microcapsule chloride ion curing agent, it specifically makes through the following steps:

[0038] 1) Preparation of Capsule A: In parts by weight, a beaker containing a mixed solution of 25 parts of tetraethyl orthosilicate, 25 parts of deionized water and 45 parts of absolute ethanol was placed on a magnetic stirrer and stirred for 3 hours, then, 10 parts of part of aluminum alginate, continue to stir for 3 hours, then slowly drop in acetic acid to adjust the pH to 4.5, after stirring for 3 hours, slowly add ammonia water dropwise until the pH is 7.5, to produce silica sol, after aging for 3 hours, filter, wash with deionized water, and place Dry in an oven at 70°C for 3 hours, crush and grind until all of them pass through a 1.5mm sieve, and then obtain aluminum alginate microcapsules coated with silica sol, ie capsule A.

[0039] 2) Preparation of Capsule B: In parts by weight, heat 100 parts of stearic acid t...

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Abstract

The invention provides a synergistically-coated swelling migration-resistant microcapsule chloride ion curing agent and a preparation method and application thereof, the synergistically-coated swelling migration-resistant microcapsule chloride ion curing agent comprises the following components in parts by weight: 50-70 parts of A capsules and 30-50 parts of B capsules; the capsule A is a silica sol coated aluminum alginate microcapsule, and the silica sol coated aluminum alginate microcapsule is mainly prepared from the following components in parts by weight: 5 to 10 parts of aluminum alginate, 20 to 25 parts of tetraethoxysilane, 25 to 30 parts of deionized water and 40 to 45 parts of absolute ethyl alcohol; the capsule B is a stearic acid coated aluminum alginate microcapsule, and the stearic acid coated aluminum alginate microcapsule is mainly prepared from the following components in parts by weight: 5-10 parts of aluminum alginate and 80-100 parts of stearic acid. After the two capsules in the synergistically coated swelling migration resistance type microcapsule chloride ion curing agent are added into concrete, the two capsules have a synergistic effect, complement each other and continuously play a swelling role, so that the purpose of blocking a chloride ion migration channel is achieved, and the corrosion resistance of reinforced concrete can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of chloride ion curing agent for reinforced concrete, in particular to a cooperative coating swelling and migration retardation microcapsule chloride ion curing agent and its preparation method and application. Background technique [0002] Chloride ion corrosion is one of the common corrosion mechanisms of reinforced concrete structures in marine environments. When the concentration of chloride ions on the surface of the steel bar reaches a critical level, the protective layer of the steel bar is destroyed, causing rapid corrosion of the steel bar, and the reinforced concrete structure quickly loses its bearing capacity, and its durability is greatly reduced. [0003] In the marine environment, the chloride ions carried by seawater or sea sand diffuse and migrate with the solution through the cement-based pores to the inner area of ​​the concrete, mainly in the form of free chloride ions and non-free chlori...

Claims

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Application Information

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IPC IPC(8): C04B24/42
Inventor 谭洪波杜超马保国李相国蹇守卫黄健刘晓海吕周岭
Owner WUHAN UNIV OF TECH