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Microencapsulation method of concrete water-based repair agent

A microencapsulation and repairing agent technology, applied in the direction of microcapsule preparation, microsphere preparation, etc., can solve problems such as coalescence and delamination, easy instability, Oswald aging, etc., and achieve the effect of stable process and low cost

Inactive Publication Date: 2015-06-24
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the double emulsion is essentially a non-thermodynamically stable system, which is very prone to instability, Ostwald ripening (Ostwald ripening), flocculation, coalescence and delamination.

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

A microencapsulation method for a concrete water-based repair agent comprises the following steps: preparing an inner water phase, the inner water phase being 0.5-3mol / L of inorganic water-based concrete repair agent and 0.01-2wt% of gelling agent water solution; preparing an oil phase, the oil phase being a styrene organic solution of which the volume concentration is 50-100%; preparing an outer water phase, the outer water phase containing 0.01-3wt% of water-soluble styrene polymerization initiator; adding 3-15wt% of water-in-oil surfactant to the oil phase, stirring 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 into the outer water phase, and stirring and mixing with the colostrum after dissolving; and heating the double emulsions to 35-70 degrees centigrade, and stirring, so as to obtain a microcapsule of a concrete water-based repair agent.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B22/16
CPCB01J13/185C04B20/10C04B2111/72
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