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A microwave-responsive concrete admixture active release capsule and preparation method thereof

A concrete admixture, active technology, applied in the directions of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problem of difficult release, etc., and achieve the effect of strong ability and wide source.

Active Publication Date: 2022-03-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above applications are all based on a passive controlled release mechanism, that is, when the environmental conditions of the concrete matrix change, the microcapsules loaded with the concrete admixture are triggered to respond to release the concrete admixture. This release mechanism can well deal with the above-mentioned applications such as repairs; However, when the condition of the concrete matrix has not changed significantly but the concrete admixture needs to be used, it is difficult to actively release it to play its role

Method used

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  • A microwave-responsive concrete admixture active release capsule and preparation method thereof
  • A microwave-responsive concrete admixture active release capsule and preparation method thereof
  • A microwave-responsive concrete admixture active release capsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Submerge the porous ceramsite with a particle size of 1.0 cm in polycarboxylate superplasticizer (mass fraction 20%), and vacuum treatment for 24 hours, so that the porous ceramsite is fully loaded with polycarboxylate superplasticizer. Heat paraffin wax (phase transition temperature 55~60°C) at 70°C to melt it, add 10% Fe 3 o 4 and stir slowly to make Fe 3 o 4 Distribute evenly in molten paraffin, quickly put the porous ceramsite loaded with polycarboxylate superplasticizer into the 3 o 4 In the molten paraffin, quickly roll several times, so that the surface of the porous ceramsite is evenly coated with a layer of paraffin, take it out, cool to room temperature, and obtain active release capsules.

[0029] The loading capacity of the active release capsule is defined as: the mass percentage of the loaded polycarboxylate superplasticizer to the total mass of the active release capsule. The active release capsules were found to have a loading capacity of 71%.

Embodiment 2

[0031] Submerge the porous ceramsite with a particle size of 1.2cm in the carboxyamino alcohol rust inhibitor (yellow liquid, 30% mass fraction), and vacuum treatment for 24 hours, so that the porous ceramsite is fully loaded with the carboxy amino alcohol rust inhibitor. Heat paraffin wax (phase transition temperature 55~60°C) at 70°C to make it melt, add 15% Fe3O4 and stir slowly to make Fe 3 o 4 Distribute evenly in molten paraffin, quickly put the porous ceramsite loaded with carboxyl amino alcohol rust inhibitor into the 3 o 4 In the molten paraffin, quickly roll several times, so that the surface of the porous ceramsite is evenly coated with a layer of paraffin, take it out, cool to room temperature, and obtain active release capsules.

[0032] The active release capsules were placed in a concrete simulation solution saturated with 3.5% NaCl in Ca(OH) 2solution, the volume ratio of the concrete simulated solution to the active release capsule is 4:1, the microwave pow...

Embodiment 3

[0034] The porous ceramsite with a particle size of 1.1 cm was immersed in a polyethylene glycol tackifier (molecular weight 1000, mass fraction 20%), and vacuum treated for 24 hours to fully load the porous ceramsite with the polyethylene glycol tackifier. Heat stearic acid at 70°C (phase transition temperature 55~60°C) to make it melt, add 25% Fe 3 o 4 and stir slowly to make Fe 3 o 4 Distribute evenly in molten stearic acid, quickly put the porous ceramsite loaded with polyethylene glycol viscosifier into the 3 o 4 In the melted stearic acid, quickly roll several times, so that the surface of the porous ceramsite is evenly coated with a layer of stearic acid, take it out, cool to room temperature, and obtain active release capsules.

[0035] Put the active release capsule into the concrete simulation solution, the concrete simulation solution is a saturated Ca(OH)2 solution with 3.5% NaCl, the volume ratio of the concrete simulation solution and the active release capsu...

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Abstract

The invention relates to the field of admixtures for building materials, in particular to a microwave-responsive admixture active release capsule and a preparation method thereof. The active release capsule is composed of a capsule wall, a capsule core and an encapsulation material, the capsule wall is porous ceramsite; the capsule core is an admixture that needs to control active release; the encapsulation material is doped with Fe 3 o 4 organic phase change materials. The method of the invention is fast and simple, the materials used have wide sources, can exist stably in building materials, and have a strong ability to load admixtures, and can be widely applied to the loading of various admixtures. In addition, using Fe in packaging materials 3 o 4 Microwave responsiveness and microwave-absorbing heat-generating function can trigger the capsule response by applying an external microwave signal to make it actively release the admixture, effectively solving the problems of low utilization efficiency and even possible negative effects of the admixture directly mixed into building materials. This enables active control of building material properties.

Description

technical field [0001] The invention relates to the field of concrete admixtures for building materials, in particular to a microwave-responsive concrete admixture active release capsule and a preparation method thereof. Background technique [0002] Among the traditional methods of improving concrete properties, the use of concrete admixtures is a very efficient, economical and environmentally friendly method, so it is widely used. However, concrete admixtures are usually mixed directly when pouring concrete, and participate in the whole process of cement hydration reaction, which has a direct impact on the effect of concrete admixtures: such as rust inhibitors, etc., whose active ingredients are easily buried by cement hydration products However, it cannot fully play its role; viscosifiers, etc., will increase the viscosity of the solution, reduce the fluidity of free water in concrete, lose workability, and delay the hydration of cement; expansion agents, etc., do not hop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/22C09K5/06C04B20/10C04B18/02
CPCB01J13/22C09K5/063C04B20/1066C04B20/1044C04B20/1025C04B20/1029C04B20/1018C04B18/027C04B2103/302C04B24/123C04B24/32
Inventor 张琪冯攀王浩川叶少雄刘新
Owner SOUTHEAST UNIV
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