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Method for preparing chloride ion triggering type microcapsule through solvent evaporation method

A technology of chloride ions and microcapsules, which is applied in the field of preparation of chloride ion-triggered microcapsules by the solvent evaporation method, can solve problems such as reducing engineering construction benefits, shortening the service life of roads and bridges with deicing salt, and affecting the durability of concrete structures, etc. Achieve the effect of appropriate size and narrow distribution

Inactive Publication Date: 2017-02-22
SHAANXI SHENGMAI PETROLEUM
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Problems solved by technology

As we all know, chloride ions are the main cause of corrosion of steel bars in concrete, which greatly affects the durability of concrete structure projects, greatly shortens the service life of coastal buildings, saline-alkali land projects and road bridges that use deicing salt, and reduces the construction of projects. benefit

Method used

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Embodiment Construction

[0013] The method for preparing chloride ion-triggered microcapsules by solvent evaporation method comprises the following steps:

[0014] (1) PbSO 4 preparation of

[0015] Na 2 SO 4 and Pb(NO 3 ) 2 Dissolve in different beakers respectively, the molar ratio is close to 1:1, stir to let them fully dissolve in water, and then Pb(NO 3 ) 2 The solution was slowly dropped into Na with a dropper 2 SO 4 solution, and constantly stirring, to complete the reaction, so that the size of the formed precipitate is small and does not agglomerate. After the reaction, vacuum filtration and vacuum drying are obtained to obtain a white powder, which is made into PbSO 4 ;

[0016] (2) Preparation of microcapsules

[0017] Add the core material hexadecane and the wall material to be coated into the beaker containing DCM, use stirring to form a homogeneous organic solvent, and then add a certain amount of PbSO 4 Add the powder into the organic solution and stir for a certain period ...

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Abstract

The invention relates to the technical field of functional materials and particularly relates to a method for preparing a chloride ion triggering type microcapsule through a solvent evaporation method. The method for preparing the chloride ion triggering type microcapsule through the solvent evaporation method comprises the following steps of (1) preparing PbSO4; and (2) preparing the microcapsule. Through the solvent evaporation method, a lead sulfate powder is well embedded into a capsule wall, the ideal chloride ion triggering type microcapsule is obtained with an emulgator of 5% at the revolving speed of 400 r / min, the distribution is relatively narrow, and the size is appropriate.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a method for preparing chloride ion-triggered microcapsules by a solvent evaporation method. Background technique [0002] The chemical principle of chemically triggered microcapsules is generally based on the influence of hydrogen bonds or ionic strength on the permeability of the microcapsule wall, so that the microcapsules respond to pH or salt concentration. At present, the research on chemically triggered microcapsules in the world mainly focuses on Focus on the pH-responsive slow-release microcapsules, and the application is oriented to the field of biomedicine. However, this response is not yet specific, that is, the microcapsules cannot be only sensitive to a specific ion. Only being sensitive to a single ion can increase the latent period of the microcapsules in the structural material and improve the repair efficiency. In this paper, chloride ion is prefer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02C04B24/00C04B22/14C04B103/60
CPCB01J13/02C04B40/0046C04B2103/60
Inventor 王耀斌
Owner SHAANXI SHENGMAI PETROLEUM
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