Air-entraining agent microcapsule and its preparation method

A technology of microcapsules and air-entraining agents is applied in the field of concrete admixtures, which can solve the problems of rapid disappearance of air bubbles and difficulty in achieving the performance indicators of anti-freeze-thaw concrete, and achieve the goal of improving concrete performance, increasing core competitiveness, and improving effective air bubbles. effect of loss

Active Publication Date: 2018-01-12
伊犁西部建设有限责任公司
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Problems solved by technology

[0005] The purpose of the present invention is to provide an air-entraining agent microcapsule and its preparation method and application to solve the problem that after the existing air-entraining agent is added to concrete, the introduced air bubbles often disappear quickly, and it is difficult to achieve the performance of freeze-thaw resistant concrete when pouring concrete Indicator flaws

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  • Air-entraining agent microcapsule and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1 The preparation method of air-entraining agent microcapsules

[0026] The preparation method for concrete air-entraining agent microcapsules adopts the following steps:

[0027] (1) First, add ethyl cellulose into the beaker of ethanol solution with a mass fraction of 98%. Completely dissolve the cellulose until the solution reaches a half-saturated state, then add sodium dodecylbenzenesulfonate, wherein the mass ratio of sodium dodecylbenzenesulfonate to ethyl cellulose is 1:3, and stir.

[0028] (2) After stirring the solution obtained in step (1) continuously for 15 minutes, put the solution into a constant temperature water bath and heat it. The temperature of the constant temperature water bath is controlled at 80°C. Sodium alkylbenzene sulfonate forms a precipitate. In this step, since the boiling point of ethanol is 78.3°C, the temperature of the water bath is chosen to be 80°C, which can effectively guarantee the volatilization of ethanol without ...

Embodiment 2

[0032] In the pouring process of the same project, the traditional method of adding air-entraining agent and the method of adding air-entraining agent microcapsules prepared in Example 1 of the present invention were used successively for comparison (see Table 1 for the amount of materials, and Table 2 for the test results) .

[0033] In order to better compare the difference between the tradition and the present invention, we adopt the main component of the air-entraining agent used in the traditional method to be selected as sodium dodecylbenzenesulfonate, and the admixture of the air-entraining agent is 1 / 2 of the total cementitious material quality of concrete. 0.6%. Traditional freeze-thaw-resistant concrete is directly mixed with air-entraining agent in the process of concrete mixing, because the air-entraining agent will release continuously in the concrete from the beginning, and because the release effect is too early, the air content of concrete will also continue to...

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Abstract

The invention discloses an air-entraining agent microcapsule. Ethyl cellulose is used as an oily microcapsule wall for wrapping sodium dodecyl benzene sulfonate so as to form the air-entraining agentmicrocapsule, wherein a mass ratio of sodium dodecyl benzene sulfonate to ethyl cellulose is 3: 1. The invention also discloses a preparation method of the air-entraining agent microcapsule. The air-entraining agent microcapsule of the invention is an air-entraining agent used for concrete; and the sustained release effect of the air-entraining agent is controlled by controlling the breaking timeof the wall of the microcapsule, so the performance indexes of anti-freezing and anti-thawing concrete can be reached. The air-entraining agent microcapsule improves the problem of loss of effective bubbles during conveying and pouring of the anti-freezing and anti-thawing concrete, enhances the working performance of the anti-freezing and anti-thawing concrete, provides a novel concept for the mix design of the anti-freezing and anti-thawing concrete, increases the core competitiveness of enterprises, and fills a blank in domestic improvement of concrete performance via microcapsule technology.

Description

technical field [0001] The invention relates to an admixture for concrete, in particular to an air-entraining agent microcapsule and a preparation method thereof. Background technique [0002] my country is now vigorously developing industrial projects in the northwest region. Affected by the special climate in the northwest region, most of the supporting environmental protection facilities for industrial projects use freeze-thaw-resistant concrete. The mechanism of freeze-thaw-resistant concrete is to add air-entraining agents to the concrete during the mixing process. Finally, air is introduced to form a large number of tiny, closed and high-quality air bubbles, thereby preventing freeze-thaw damage. [0003] However, in the existing freeze-thaw-resistant concrete, most of the air bubbles introduced are affected by the pouring method and transportation distance, resulting in a serious loss of effective air bubbles in the freeze-thaw-resistant concrete. Air agent, polycarbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/20C04B20/10C04B28/00C04B103/30
Inventor 李科汛刘平王成鹿学先赵亮
Owner 伊犁西部建设有限责任公司
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