SAPs microcapsules and cement-based self-repairing material

A technology for repairing materials and microcapsules, which is applied in the field of anti-cracking and self-repairing of cracks in cement-based materials, can solve the problems of increasing the yield of microcapsules, affecting the repair efficiency, and easily breaking the microcapsules. Increased durability and improved crack resistance

Inactive Publication Date: 2020-01-31
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, resin materials such as urea-formaldehyde are brittle, and the microcapsules are easily broken during the stirring process, which causes the repair agent to be released in advance, affects the repair efficiency, and causes a certain degree of damage to the matrix strength.
Furthermore, the in-situ polymerization method has relatively strict requirements on the synthesis process, and the problem of the yield of microcapsules increases the preparation cost.

Method used

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  • SAPs microcapsules and cement-based self-repairing material
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  • SAPs microcapsules and cement-based self-repairing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Put 6.6g of sodium acrylate and 330g of deionized water into the reactor, stir to dissolve it completely, prepare a sodium acrylate aqueous solution, add 33g of sodium hydroxide to the solution, stir to dissolve, add 0.1g of potassium persulfate, start Stir and raise the temperature to 90°C to initiate polymerization, and the reaction ends in about 30 minutes to obtain a 2.0 wt% sodium polyacrylate prepolymer solution;

[0037] (2) Place the four-necked flask containing the above sodium polyacrylate prepolymer solution in a 60°C water bath, add 0.5g sodium lauryl sulfate and stir until it is dissolved, then add 23.1g bisphenol A type ring Oxygen resin, continue to stir for 2h, stirring speed 500r / min, to obtain a mixed solution.

[0038] (3) Prepare coagulation bath solution. Add 10g of N,N'-methylenebisacrylamide to 500mL of deionized water and dissolve to obtain a N,N'-methylenebisacrylamide solution;

[0039] The mixed solution obtained in step (2) is dripped into the...

Embodiment 2

[0043] (1) Put 4.2g of acrylamide and 420g of deionized water into the reactor, stir to dissolve it completely, prepare an aqueous solution of acrylamide, add 21g of sodium hydroxide, stir to dissolve, add 0.1g of potassium persulfate, start stirring, water bath The temperature is 55°C, polymerization is initiated, and the reaction is completed in about 30 minutes to obtain a polyacrylamide prepolymer solution;

[0044] (2) Place the four-necked flask containing the above polyacrylamide prepolymer solution in a 70℃ water bath, add 0.42g sodium alkyl sulfate and stir until it is dissolved, then add 2.1g bisphenol A epoxy resin , Continue to stir for 15 minutes, stirring speed 250r / min, to obtain a mixed solution.

[0045] (3) Prepare coagulation bath solution. Add 2.5 g of phosphoric acid maleic anhydride to 500 mL of deionized water and dissolve to obtain a phosphoric acid maleic anhydride solution;

[0046] The mixed solution obtained in step (2) is dripped into the maleic anhydri...

Embodiment 3

[0050] (1) Put 10.5g of sodium acrylate and 300g of deionized water into the reactor, stir to dissolve it completely, prepare an aqueous solution of sodium acrylate, add 30g of sodium hydroxide to the solution, stir to dissolve, add 3.1g of potassium persulfate, start Stir, heat up to 90°C, initiate polymerization, and complete the reaction in about 30 minutes to obtain a 3.5 wt% sodium polyacrylate prepolymer solution;

[0051] (2) Place the four-necked flask containing the above sodium polyacrylate prepolymer solution in a 70°C water bath, add 1.55g of sodium dodecylbenzene sulfonate and stir to dissolve it, and then add 126g of fluorocarbon to the flask Resin, stirring speed 650r / min, continue stirring for 1.5h to obtain a mixed solution.

[0052] (3) Prepare coagulation bath solution. Add 12.5g of N,N'-methylenebisacrylamide to 500mL of deionized water and dissolve to obtain a N,N'-methylenebisacrylamide solution;

[0053] The mixed solution obtained in step (2) is dripped into...

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Abstract

The invention relates to SAPs microcapsules and a cement-based self-repairing material. The SAPs microcapsules are prepared by coating a hydrophobic adhesive with a water-absorbing polymer (SAPs), andthe particle size of the SAPs microcapsules ranges from 0.2 mm to 2.0 mm; the content of the core material of the microcapsule is 20-80wt%. The cement-based self-repairing material comprises the following basic components: cement, sandstone, the SAPs microcapsules and water. The SAPs microcapsules are prepared by adopting a sharp hole forming coagulating bath method, the process is easy for large-scale production, the mechanical properties meet the concrete mixing requirements, the matrix shrinkage can be reduced, the freeze thawing resistance and the cracking resistance can be improved, andthe strength of a set cement matrix can be improved; the cement-based self-repairing material has multiple crack self-repairing mechanisms, efficient self-repairing of the cement-based material can beachieved, durability is improved, and the service life is prolonged.

Description

Technical field [0001] The invention relates to a SAPs microcapsule and a cement-based self-repairing material, belonging to the technical field of anti-cracking and crack self-repairing of cement-based materials. Background technique [0002] Cement-based materials are widely used, but during construction and service, they are affected by complex environmental changes such as temperature and humidity, and are prone to micro-cracks, which in turn induce macro-cracks, which seriously affect structural safety and durability. The development trend of modern concrete with high fluidity and low water-cement ratio increases the risk of shrinkage and cracking. Traditional methods have long maintenance cycles, low efficiency and huge cost. The maintenance of bridges and highways and other continuous service facilities still has problems such as interrupting traffic. Therefore, cement-based materials that can detect cracks in real time and actively repair them are of great significance f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C04B24/26C04B24/42C04B28/04B01J13/02B01J13/14C04B111/20
CPCB01J13/02B01J13/025B01J13/14C04B20/1033C04B28/04C04B2111/20C04B2111/29C04B24/281C04B24/42C04B24/2682C04B2103/302C04B14/06C04B24/121
Inventor 毛倩瑾齐文静伍文文黄丽娜王子明崔素萍
Owner BEIJING UNIV OF TECH
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