Additive 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 problem of inability to actively control the release of the admixture by external signals, and achieves large storage capacity of the admixture, broad application prospects, The effect of resolving early losses

Active Publication Date: 2020-08-07
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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  • Additive microcapsule based on microwave controlled release and preparation method thereof
  • Additive microcapsule based on microwave controlled release and preparation method thereof
  • Additive 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 PDVF 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 PDVF 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 PDVF 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 PDVF 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 PDVF 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 PDVF 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 PDVF 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 PDVF fiber tube completely in the viscosifier (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 PDVF 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] For...

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Abstract

The invention relates to the field of additives for building materials, in particular to an additive microcapsule based on microwave controlled release and a preparation method thereof. The microcapsule is composed of a capsule wall, a capsule core and a packaging material, wherein the capsule wall is made of polyvinylidene fluoride fiber; the capsule core is an additive which needs to be controlled to release; the packaging material is a heat-sensitive phase change material; according to the method, the PDVF material is high in strength, resistant to acid and alkali and suitable for being used in building materials; most importantly, the PDVF material can realize microwave response, so that active controlled release of the admixture in concrete can be realized, and the problem of performance loss caused by advanced release of the admixture is effectively solved.

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 Applications(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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