Calcium alginate microcapsule with high core material content

A technology of calcium alginate and microcapsules is applied in the field of concrete crack repair, which can solve the problems of microcapsules bonding and difficult to disperse, and achieves the effects of maintaining integrity, reducing influence and reducing interface voids.

Active Publication Date: 2019-01-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the core material content increases, part of the core material will ooze out to the surface of the microcapsules, resulting in the bonding of the microcapsules and making it difficult to disperse.

Method used

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  • Calcium alginate microcapsule with high core material content
  • Calcium alginate microcapsule with high core material content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Weigh 17.5 g of sodium alginate solid, add it to 500 mL of deionized water, stir, and after the sodium alginate solid is completely dissolved, a 0.035 g / mL sodium alginate solution is obtained;

[0036] In a water bath at 55°C, add the above-mentioned sodium alginate solution and 1.875g of sodium dodecylbenzenesulfonate to the four-necked flask and stir; then add 75.0g of E-51 bisphenol A epoxy resin, and stir at a speed of 600r / min Stir for 1.5 hours, and get epoxy resin-sodium alginate mixture after cooling.

[0037] (2) Weigh 9.0g of calcium chloride solid and add it to 300mL of deionized water. After the calcium chloride is completely dissolved, a 0.03g / mL calcium chloride solution is obtained; drip the mixed solution obtained in step (1) through a syringe Add it to the above calcium chloride solution, and after the dropwise addition, continue to react for 3 hours to obtain primary calcium alginate microcapsules.

[0038] (3) Take out the primary calcium algina...

Embodiment 2

[0043](1) Weigh 7.5g of sodium alginate solid, add it to 500mL of deionized water, stir, and after the sodium alginate solid is completely dissolved, a 0.015g / mL sodium alginate solution is obtained;

[0044] In a water bath at 55°C, add the above-mentioned sodium alginate solution and 0.375g of sodium dodecylbenzenesulfonate to the four-necked flask and stir; then add 150.0g of E-51 bisphenol A epoxy resin, and stir at a speed of 600r / min Stir for 1.5 hours, and get epoxy resin-sodium alginate mixture after cooling.

[0045] (2) Weigh 3.0 g of calcium chloride solid, add it to 300 mL of deionized water, and after the calcium chloride solid is completely dissolved, obtain a 0.01 g / mL calcium chloride solution; pass the mixed solution obtained in step (1) through a syringe Add it dropwise into the above calcium chloride solution, and after the dropwise addition is completed, continue to react for 3 hours to obtain primary calcium alginate microcapsules.

[0046] (3) Take out t...

Embodiment 3

[0051] (1) Weigh 7.5g of sodium alginate solid, add it to 500mL of deionized water, stir, and after the sodium alginate solid is completely dissolved, a 0.015g / mL sodium alginate solution is obtained;

[0052] In a water bath at 55°C, add the above-mentioned sodium alginate solution and 2.00 g of emulsifier to the four-necked flask and stir; then add 85.0 g of 531 urea-formaldehyde resin glue, stir at a stirring speed of 600 r / min for 1.5 h, and obtain urea-formaldehyde resin-seaweed after cooling Sodium acid mixture.

[0053] (2) Weigh 7.5g of calcium chloride solid and add it to 300mL deionized water. After the calcium chloride solid is completely dissolved, a 0.025g / mL calcium chloride solution is obtained; pass the mixed solution obtained in step (1) through a syringe Add it dropwise into the above calcium chloride solution, and after the dropwise addition is completed, continue to react for 3 hours to obtain primary calcium alginate microcapsules.

[0054] (3) Take out t...

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Abstract

The invention relates to a calcium alginate microcapsule with high core material content. The calcium alginate microcapsule with high core material content comprises a polymer outer layer, a calcium alginate bracket and a core material repairing agent. Curable polymer resin is the core material repairing agent and fills interconnected channels of the calcium alginate bracket; an outermost layer isa cured polymer resin layer. The preparation method comprises the steps: firstly, primarily prepared calcium alginate microcapsules with high core material content are prepared by a sharp hole-coagulation bath method; secondly, the outer-layer polymer resin is cured to obtain the calcium alginate microcapsule with high core material content and with the structure. The microcapsule has water absorption and controllable volume swelling rate, has the content of the polymer core material of 65%-95%, and can be used for self-repairing of cracks in a cement matrix.

Description

technical field [0001] The invention relates to a calcium alginate microcapsule with high core material content, belonging to the technical field of concrete crack repair. Background technique [0002] Cement is a widely used building material, but it is prone to micro-cracks inside the material, and the traditional inspection and maintenance methods have long cycle, low efficiency and huge cost. Therefore, people have researched and developed a cement-based material self-repair system based on the principle of bionics, which is used to automatically repair cracks and prolong the service life of cement-based materials. [0003] Microcapsule self-healing technology has the advantages of strong applicability, low cost, easy control of synthesis process, and easy uniform dispersion in cement-based materials. Among them, the calcium alginate microcapsule is a three-dimensional network structure microsphere with calcium alginate having water absorption and swelling properties as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/10C04B24/38
CPCC04B20/1037C04B40/0039C04B24/38C04B24/281
Inventor 毛倩瑾伍文文张雨辰齐文静马建峰王子明崔素萍
Owner BEIJING UNIV OF TECH
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