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Microwave-responsive admixture active release capsule and preparation method thereof

An admixture and active technology, which is applied in the direction of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve problems such as difficult release, and achieve the effect of active control, wide sources, and strong ability to load admixtures

Active Publication Date: 2020-09-11
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 response of the microcapsules loaded with the admixture is triggered to release the admixture. This release mechanism can well deal with the above-mentioned applications such as repairs; When the condition of the matrix has not changed greatly but the admixture needs to be used, it is difficult to actively release it to exert its effectiveness

Method used

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  • Microwave-responsive admixture active release capsule and preparation method thereof
  • Microwave-responsive admixture active release capsule and preparation method thereof
  • Microwave-responsive admixture active release capsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The porous ceramsite with a particle size of 1.0 cm was immersed in the polycarboxylate water reducer (20% by mass fraction), and vacuum treated for 24 hours, so that the porous ceramsite was fully loaded with the polycarboxylate water reducer. 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.

[0030] 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

[0032] 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 melt it, 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.

[0033] The active release capsules were placed in a concrete simulation solution that was saturated with Ca(OH) with 3.5% NaCl 2 solution, the volume ratio of the concrete simulated solution to the active release capsule is 4:1, the microw...

Embodiment 3

[0035] 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, so that the porous ceramsite was fully loaded 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.

[0036] 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 to the active ...

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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 a packaging material, wherein the capsule wall is made of porous ceramsite; the capsule core is an admixture needing to control active release;and the packaging material is an organic phase change material doped with Fe3O4. The method disclosed by the invention is rapid, simple and convenient, the used materials have wide sources, the active release capsule can stably exist in building materials, has strong additive loading capacity, and can be widely applied to loading of various admixtures. Besides, the microwave responsiveness and the wave-absorbing and heat-generating functions of Fe3O4 in the packaging material are utilized, the capsule response can be triggered by applying an external microwave signal to actively release the admixture, so that the problems of low utilization efficiency, even possible negative effect and the like when the admixture is directly doped into the building materials are effectively solved, and the active control on the performance of the building materials is further realized.

Description

technical field [0001] 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. Background technique [0002] In the traditional method of improving concrete performance, the use of admixture is a very efficient, economical and environmentally friendly method, so it is widely used. However, 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 admixtures: such as rust inhibitors, etc., whose active ingredients are easily buried by cement hydration products and cannot Give full play to 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 hope that when the cement has just begun to hydrate an...

Claims

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Application Information

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Patent Type & Authority Applications(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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