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Microencapsulation method of concrete water-based repair agent

A technology of microencapsulation and repairing agent, applied in microcapsule preparation, microsphere preparation and other directions, can solve the problems of easy instability, coalescence and delamination, Ostrich ripening, etc., and achieve the effect of low cost and stable process

Inactive Publication Date: 2014-03-05
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the double emulsion is essentially a non-thermodynamically stable system, which is very pr

Method used

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  • Microencapsulation method of concrete water-based repair agent
  • Microencapsulation method of concrete water-based repair agent
  • Microencapsulation method of concrete water-based repair agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] S11: Prepare the inner water phase, prepare 30 mL of aluminum dihydrogen phosphate solution with a concentration of 1 mol / L, drop 5 drops (about 0.25 ml) of 5 wt% gelatin aqueous solution, and adjust the viscosity of the inner water phase;

[0038] S12: Prepare the oil phase, pour an appropriate amount of 5wt% NaOH aqueous solution into the commercially available styrene as the washing liquid, oscillate, separate the liquid, and remove the slightly red NaOH washing liquid after washing, repeat several times until the NaOH washing The liquid is colorless. Then add 5g of anhydrous sodium sulfate, seal it, and dry it in a dark place for more than 3 days to remove moisture. Finally, distill under reduced pressure and keep the middle distillate away from light and low temperature. This is styrene without polymerization inhibitor (hydroquinone).

[0039] Take 15 mL of the above-treated styrene and mix it with 15 mL of the toluene that has been processed by distillation to pr...

Embodiment 2

[0047] S21: prepare the inner water phase, prepare 30 mL of sodium silicate solution with a concentration of 1 mol / L, drop 2 drops (about 0.1 ml) of 5 wt% xanthan gum aqueous solution, and adjust the viscosity of the inner water phase;

[0048] S22: Prepare the oil phase, pour an appropriate amount of NaOH aqueous solution with a concentration of 5wt% into commercially available styrene as the washing liquid, oscillate, separate the liquid, and remove the slightly red NaOH washing liquid after washing, repeat several times until the NaOH washes The liquid is colorless. Then add 5g of anhydrous sodium sulfate, seal it, and dry it in a dark place for more than 3 days to remove moisture. Finally, distill under reduced pressure and keep the middle distillate away from light and low temperature. This is styrene without polymerization inhibitor (hydroquinone).

[0049] Take 30 mL of the above-treated styrene and mix it with 15 mL of distilled chloroform to prepare a chloroform solu...

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Abstract

The invention relates to the technical field of self-repair materials, and provides a microencapsulation method of a concrete water-based repair agent. The method comprises the following steps: preparing an inner water phase, wherein the inner water phase is 0.5-3mol/L of inorganic water-based concrete repair agent and 0.01-2wt% of gelling agent water solution; preparing an oil phase, wherein the oil phase is a styrene organic solution of which the volume concentration is 50-100%; preparing an outer water phase, wherein the outer water phase contains 0.01-3wt% of water-soluble styrene polymerization initiator; adding 3-15wt% of water-in-oil surfactant to the oil phase, agitating and mixing with the inner water phase after dissolving, so as to obtain colostrum; preparing double emulsions; adding 3-5wt% of oil-in-water surfactant to the outer water phase, agitating and mixing with the colostrum after dissolving; and warming the double emulsions to 35-70 DEG C, and agitating, so as to obtain a microcapsule of the concrete water-based repair agent. The preparation method of the microcapsule of the concrete water-based repair agent is low in cost and applicable to industrial production.

Description

technical field [0001] The invention belongs to the technical field of self-repairing materials, and in particular relates to a microencapsulation method of a concrete water-based repairing agent. Background technique [0002] Concrete is a hydraulically hardened porous gelatinous artificial stone material. Due to its small elongation and low tensile strength, it is easy to produce shrinkage cracks and load cracks. The existence of cracks greatly affects the durability of concrete engineering, and one solution is to repair the cracks. However, artificial repair is only suitable for external cracks. Due to the unpredictability of crack occurrence and the limitation of crack detection technology, it is difficult to find and repair a large number of internal cracks. Therefore, it is necessary to develop "smart" concrete with self-repair function. [0003] One way to achieve self-healing concrete is to pre-embed a repairing agent in the concrete matrix. When the crack expands, ...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B22/16
CPCB01J13/185C04B20/10C04B2111/72C04B12/04C04B24/2676C04B24/383C04B22/16C04B22/148C04B22/0013C04B22/143C04B22/147
Inventor 朱光明邢峰宋超男周玉明汤皎宁董必钦王险峰韩宁旭
Owner SHENZHEN UNIV
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