Concrete structure self-immune self-repairing microcapsule and preparation method

Abstract

The invention relates to a concrete structure self-immune self-repairing microcapsule and a preparation method. The microcapsule is composed of a capsule wall and a core material in the capsule, the capsule wall is urea resin, and the core material is a mixture of ethyl phenylacetate and epoxy resin. Arabic gum solid, ammonium chloride solid, resorcinol and urea are weighed and dissolved in purified water, and a wall material solution is prepared; a core material solution is prepared from epoxy resin and ethyl phenylacetate; the wall material solution is adjusted to be acidic, the wall material solution is heated, the core material solution is added, stirring is carried out, a formaldehyde solution is added, the rotating speed is then adjusted to be 650 r / h-950 r / h, the temperature is keptat 55-85 DEG C, and stirring for 2-5 h is carried out; and the turbid liquid is cooled, suction filtration is carried out on the turbid liquid, purified water is added for washing, suction filtrationfor 3-4 times is carried out, and the filtrate is dried to obtain the product. The microcapsule prepared by the invention can ensure the service life of concrete to a great extent, effectively improves the corrosion resistance of the concrete, and can self-repair the cracking and shrinkage conditions of the concrete after being used for a certain time, thereby lowering the later maintenance cost.

Description

technical field [0001] The invention relates to the field of concrete wood engineering, and relates to a concrete structure self-immune and self-repairing microcapsule and a preparation method thereof. Background technique [0002] Saline soil has an impact on the service life of concrete, especially in Northwest China, where the area of ​​saline soil accounts for 69.03% of the country. Due to its special geographical environment, concrete projects often have engineering safety problems such as cracking, strength reduction, and poor durability. , and in the later maintenance, maintenance is difficult and expensive. The concrete structure has been in a sulfate environment for a long time. Sulfate ions slowly enter the interior of the concrete through the micropores of the concrete itself, and combine with the calcium ions of the concrete itself to form precipitated calcium sulfate, causing expansion stress, destroying the concrete structure, and causing concrete cracks . ...

AI Technical Summary

Problems solved by technology

[0005] (1) When the microcapsules are mixed in the concrete structure, they are prone to breakage, causing the microcapsules to fail; when the microcapsules are triggered by mechanical force, the probability of concrete microcracks located in the central area of ​​the microcapsules is small, resulting in a low rate of microcapsule damage and repairing poor effect

[0006] (2) When preparing microcapsules, there will be adhesion and agglomeration in the prepared microcapsules, which will affect the performance of the microcapsules

[0007] (3) Most of the microcapsules on the market have complex preparation processes, high raw material costs, and low yields.

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