A kind of admixture microcapsule based on microwave controlled release and preparation method thereof

An admixture and microcapsule technology, which is applied in the field of admixture microcapsules based on microwave controlled release and its preparation, can solve the problems of inability to actively control the release of the admixture by external signals, achieve a large storage capacity of the admixture, solve the negative effects, Promising effects

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

[0006] However, the controlled release technologies of concrete admixtures in the above patents are all triggered based on passive environmental responses, and cannot actively control the release of admixtures through external signals

Method used

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  • A kind of admixture microcapsule based on microwave controlled release and preparation method thereof
  • A kind of admixture microcapsule based on microwave controlled release and preparation method thereof
  • A kind of admixture microcapsule based on microwave controlled release and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]The preparation of a kind of microwave controlled release additive microcapsule and the test of microwave controlled release additive, comprise the following steps:

[0045] 1. Preparation of microwave controlled-release microcapsules:

[0046] The commercial-grade PVDF fiber tube was cut to a length of 2 cm, the diameter of the selected fiber tube was 2 mm, the wall thickness was about 200 μm, and the micropore diameter on the wall was 0.2 μm. Soak the cut PVDF fiber tube completely in an aqueous solution of polycarboxylate superplasticizer with a solid content of 10% (add a small amount of methyl orange indicator), and then place it in a vacuum drying dish to draw a negative pressure to less than 20Kpa for 24 hours , so that the PVDF fiber tube is fully filled with water reducing agent. After the fiber tube filled with liquid water reducer is taken out from the solution, it is quickly immersed in melted paraffin and then taken out, so that the paraffin is rapidly soli...

Embodiment 2

[0050] The commercial-grade PVDF fiber tube was cut to a length of 1 cm, the diameter of the selected fiber tube was 1 mm, the wall thickness was about 50 μm, and the micropore diameter on the wall was 0.01 μm. Soak the cut PVDF fiber tube completely in the aqueous solution of imidazole rust inhibitor, and then place it in a vacuum drying dish to draw a negative pressure to less than 20Kpa for 24 hours, so that the PVDF fiber tube is fully filled with the rust inhibitor. After the fiber tube filled with the liquid rust inhibitor is taken out from the solution, it is quickly immersed in melted paraffin and then taken out, so that the paraffin is rapidly solidified at room temperature (20°C) to seal and wrap the entire fiber tube. The melting point of the paraffin is 50- 55°C. The steps of immersing the fiber tube in melted paraffin and taking it out are repeated several times, so that the fiber tube is completely encapsulated, and the target microwave controlled-release microca...

Embodiment 3

[0052] The commercial-grade PVDF fiber tube was cut to a length of 1 cm, the diameter of the selected fiber tube was 1.5 mm, the wall thickness was about 100 μm, and the micropore diameter on the wall was 0.01 μm. Soak the cut PVDF fiber tube completely in the tackifier (polyethylene glycol aqueous solution, molecular weight 400, mass fraction 10%), and then place it in a vacuum drying dish with a negative pressure of less than 20Kpa for 24 hours to make the PVDF fiber The tube is fully filled with tackifier. After the fiber tube filled with liquid rust inhibitor is taken out from the solution, it is quickly immersed in the gel formed by liquid stearic acid + peanut oil and then taken out again, so that the gel can be solidified rapidly at room temperature (20°C) to seal and wrap the entire fiber tube , the gel phase transition point is about 50-55°C. The gel completely encapsulates the fiber tube to obtain the target microwave controlled release microcapsule.

[0053] Form ...

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Abstract

The present invention relates to the field of admixtures for building materials, in particular to an admixture microcapsule based on microwave controlled release and a preparation method thereof; Vinyl fluoride fiber; the capsule core is an admixture that requires controlled release; the packaging material is a heat-sensitive phase change material; the PDVF material in the disclosed method has high strength, acid and alkali resistance, and is suitable for use in building materials; the most important The most important thing is that the PDVF material can realize the microwave response, so that the active and controlled release of the admixture in the concrete can be realized, which effectively solves the problem of performance loss caused by the early release of the admixture.

Description

technical field [0001] The invention relates to the field of admixtures for building materials, in particular to an admixture microcapsule based on microwave controlled release and its preparation method and application. Background technique [0002] Concrete is one of the most widely used building materials in modern engineering construction, and admixtures play an increasingly important role in concrete. Appropriate addition of different admixtures can bring different performance improvements to concrete: water reducing agent can adjust the work performance of fresh concrete to benefit the later strength; early strength agent can promote hydration and improve the early strength of concrete; retarder or accelerator The setting time of cement can be adjusted; the air-entraining agent or rust inhibitor is beneficial to the durability of concrete, etc. From the beginning of mixing the raw materials to the hardening and maturity of concrete, different admixtures need to work i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/36C04B24/26C04B24/32B01J13/04
CPCC04B40/0039B01J13/046C04B24/2682C04B24/24C04B24/36C04B24/128C04B24/32C04B24/085C04B24/08
Inventor 冯攀王浩川叶少雄刘新赵立晓
Owner SOUTHEAST UNIV
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