A slow-release anti-corrosion microcapsule applied to reinforced concrete and its preparation method

A reinforced concrete and microcapsule technology, applied in the field of materials, can solve the problems of large size, high temperature and damage, and achieve the effects of high utilization rate of raw materials, wide size regulation range and controllable release rate.

Active Publication Date: 2019-06-25
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Extrusion spheronization granulation-coating method is generally used in the prior art to prepare microcapsules, but the size of microcapsules prepared by this method is relatively large, above 400um, and the size of microcapsules cannot be reduced as required, and the preparation process of microcapsules is relatively Complicated, the process requirements are high when extruding the core material for spheronization, and the drug loading rate of the obtained microcapsules is relatively low, usually only about 20%
There is also a method of blending and extruding inorganic rust inhibitors and polymer materials to obtain blended particles with a certain slow-release effect. However, due to the high temperature during processing, it is not suitable for products with poor thermal stability. core material, and some core materials have a strong destructive effect on equipment at high temperatures

Method used

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  • A slow-release anti-corrosion microcapsule applied to reinforced concrete and its preparation method
  • A slow-release anti-corrosion microcapsule applied to reinforced concrete and its preparation method
  • A slow-release anti-corrosion microcapsule applied to reinforced concrete and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The preparation method of ethyl cellulose / sodium monofluorophosphate antirust microcapsules comprises the following steps:

[0070] 1) Preparation of core material by centrifugation: Mix 1000g of sodium monofluorophosphate and auxiliary materials according to the ratio in Table 1, then add them to the centrifugal equipment, turn on the blower in turn, the blower speed is 400r / min, the turntable speed is 600r / min, and the peristaltic pump is turned on For liquid supply, the peristaltic pump speed is 10r / min, and the liquid supply volume is 300ml. When the material flows in flocculent form in the pot, turn off the peristaltic pump, continue to rotate, polish, take out and dry when the particle size and hardness meet the requirements, and obtain the core material.

[0071] 2) Coating solution preparation: add ethyl cellulose into ethyl acetate according to the ratio in Table 2, and prepare a transparent and uniform coating solution under heating and stirring with a magneti...

Embodiment 2

[0075] The preparation method of polystyrene / calcium nitrite antirust microcapsules comprises the following steps:

[0076] 1) Prepare the core material by centrifugation: mix 1000g of calcium nitrite and auxiliary materials according to the ratio in Table 1, then add them to the centrifugal equipment, turn on the blower in turn, the blower speed is 400r / min, the turntable speed is 500r / min, turn on the peristaltic pump to supply Peristaltic pump speed is 10r / min, and the liquid supply volume is 400ml. Turn off the peristaltic pump when the material flows in flocculent shape in the pot, continue to rotate, polish, take out and dry when the particle size and hardness meet the requirements, and obtain the core material .

[0077] 2) Coating solution preparation: polystyrene was added into ethyl acetate according to the ratio in Table 2, and a transparent and uniform coating solution was prepared under heating and stirring with a magnetic stirrer.

[0078] 3) Fluidized bed coati...

Embodiment 3

[0080] The preparation method of polycarbonate / cerium nitrate antirust microcapsules comprises the following steps:

[0081] 1) Prepare the core material by centrifugation: mix 1000g of cerium nitrate according to the ratio in Table 1 and add it to the centrifugal equipment, turn on the blower in turn, the blower speed is 500r / min, the turntable speed is 400r / min, turn on the peristaltic pump to supply liquid, and the peristaltic The pump speed is 20r / min, and the liquid supply volume is 400ml. When the material flows in flocculent form in the pot, turn off the peristaltic pump, continue to rotate, polish, and take out and dry when the size and hardness of the particles meet the requirements to obtain the core material.

[0082] 2) Coating solution preparation: polycarbonate was added into ethyl acetate according to the ratio in Table 2, and a transparent and uniform coating solution was prepared under heating and stirring with a magnetic stirrer.

[0083] 3) Fluidized bed coa...

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Abstract

The invention provides slowly released type anti-rust microcapsules applied to steel reinforced concrete and a preparation method thereof. Each slowly released type anti-rust microcapsule applied to the steel reinforced concrete comprises a core material and a wall material, and is characterized in that the core material comprises an inorganic anti-rust agent and an auxiliary material; the wall material comprises a high molecular material capable of controlling releasing of the anti-rust agent; the core material is prepared from the following components in parts by weight: 100 parts of the inorganic anti-rust agent, 90 to 110 parts of microcrystalline cellulose and 2 to 4 parts of hydroxypropylmethyl cellulose. The slowly released type anti-rust microcapsules applied to the steel reinforced concrete, provided by the invention, have a smaller size, a relatively wide size regulation and control range and a higher drug loading ratio; the thickness of the wall material can be regulated and controlled according to requirements on a releasing speed and a period, so that the aim of controlling releasing is realized; the slowly released type anti-rust microcapsules applied to the steel reinforced concrete have the characteristics of simple preparation flow, high raw material utilization rate, high drug loading ratio, relatively wide size regulation and control range, long core material releasing period, controllable releasing speed and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a steel bar antirust microcapsule, in particular to a slow-release antirust microcapsule applied to reinforced concrete and a preparation method thereof. Background technique [0002] In coastal buildings, due to the characteristics of seawater, the steel bars in concrete are prone to electrochemical corrosion in sea water, and the corrosion of steel bars will lead to the degradation or even failure of reinforced concrete structural materials. In ordinary environments, the expenditure on anti-corrosion of metal structural materials accounts for about 2% to 4% of the total cost, while it is as high as 10% to 30% in marine environments where the corrosion environment is more complex. Therefore, the development of concrete rust inhibitors with high efficiency and low cost has become a research hotspot at home and abroad. [0003] Steel bar rust inhibitor is a chemical substance tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B103/61
CPCC04B20/1048C04B22/064C04B22/085C04B22/16C04B24/383C04B40/0039C04B2103/61C04B20/1033C04B20/1037C04B20/1022
Inventor 左建东詹嘉罗超云董必钦邢锋郑剑伟
Owner SHENZHEN UNIV
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