Preparation and application of cement material self-repairing molecular self-assembled microspheres

A cement material, self-healing technology, used in the preparation of microspheres, microcapsule preparations, etc., to achieve the effect of improving compression

Inactive Publication Date: 2013-10-30
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although some meaningful research work has been done on self-healing concrete, there are still many problems to be solved, such as multiple healing properties, aging of glue, reliability and feasibility of repair, etc.; the selection of repair adhesives , research on the release mechanism, compatibility of microspheres and concrete fracture matching, etc., there is still a lot of work to be done, especially for the problems in the preparation and application of self-healing concrete in actual production

Method used

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  • Preparation and application of cement material self-repairing molecular self-assembled microspheres
  • Preparation and application of cement material self-repairing molecular self-assembled microspheres
  • Preparation and application of cement material self-repairing molecular self-assembled microspheres

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Experimental program
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Embodiment 1

[0034] Embodiment 1 (general cement)

[0035] A kind of preparation method that has self-healing function microsphere to universal cement, comprises the following steps:

[0036] (1) select the repairing liquid epoxy resin that can have repairing function to general cement material, active diluent is dilute with benzyl alcohol;

[0037] (2) add surfactant sodium dodecylbenzenesulfonate to the solution that step (1) obtains, stir 35min, form the emulsion of O / W;

[0038] (3) in the solution that step (2) obtains, add functional monomer polyethylene, divinylbenzene to be spherical wall;

[0039] (4) Add cross-linking agent methacrylamide and porogen toluene to the solution obtained in step (3), feed nitrogen to replace the air inside;

[0040] (5) Slowly heat up to 70°C, and react continuously for 4 hours at a stirring speed of 300r / min;

[0041] (6) Add 0.4% initiator potassium persulfate, continue to react for 2 hours, and vacuum dry;

[0042] (7) The product obtained in t...

Embodiment 2

[0048] Embodiment 2 (masonry cement)

[0049] A method for preparing microspheres with self-repairing function for masonry cement, comprising the following steps:

[0050] (1) select the repair fluid polysulfide rubber and butyl rubber that can repair the masonry cement material, and the reactive diluent is dilute with n-butanol;

[0051] (2) add surfactant cetyltrimethylammonium bromide in the solution that step (1) obtains, stir 50min, form the emulsion of O / W;

[0052] (3) in the solution that step (2) obtains, add functional monomer polystyrene, polybutadiene to be spherical wall;

[0053](4) Add crosslinking agent methacrylamide and porogen n-heptane to the solution obtained in step (3), feed nitrogen to replace the air inside;

[0054] (5) Slowly heat up to 75°C, and react continuously for 5 hours at a stirring speed of 250r / min;

[0055] (6) Add 0.3% initiator potassium persulfate, continue to react for 3 hours, and vacuum dry;

[0056] (7) The product obtained in t...

Embodiment 3

[0062] Embodiment 3 (road portland cement)

[0063] A preparation method for road Portland cement with self-repairing functional microspheres, comprising the following steps:

[0064] (1) Select suitable road Portland cement repair fluid polyurethane and α-cyanoacrylate, active diluent xylene to dilute;

[0065] (2) add surfactant Tween in the solution that step (1) obtains, stir 35min, form the emulsion of O / W;

[0066] (3) adding functional monomer polyamide and polyacrylamide to the solution obtained in step (2) are spherical walls;

[0067] (4) Add crosslinking agent methacrylamide and porogen liquid paraffin to the solution obtained in step (3), feed nitrogen to replace the air inside;

[0068] (5) Slowly heat up to 65°C, and react continuously for 4 hours at a stirring speed of 250r / min;

[0069] (6) Add 0.4% initiator ammonium persulfate, continue to react for 2 hours, and dry in vacuum;

[0070] (7) The product obtained in step (6) is mixed into cement with a conte...

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Abstract

The invention discloses preparation of cement material self-repairing microspheres and application of the self-repairing microspheres in cement concrete. The microsphere preparation comprises the following steps: selecting repairing liquid with good repairing performance for cement and concrete; designing and screening self-repairing microsphere functional monomers; selecting cross-linking agent and porogen, and polymerizing the obtained functional monomers and the repairing liquid into microspheres with self-repairing function under proper conditions by using a molecular self-assembly technology; preparing self-repairing microspheres from the repairing liquid, the monomers, initiator, cross-linking agent, porogen and emulsifier under certain conditions in a certain proportion; and mixing the prepared cement material self-repairing microspheres in the cement and cement concrete to repair the material. By mixing the self-repairing microspheres, the breaking strength and compression strength of the cement concrete which cracks under stress are quickly recovered; and since the microspheres is added, the freezing resistance and erosion resistance of the cement concrete are remarkably improved.

Description

technical field [0001] The invention relates to the field of new building materials, more specifically to the preparation of cement material self-repairing microspheres, and the invention also relates to the application of cement material self-repairing microspheres in cement concrete. Background technique [0002] With the continuous progress of modern material science, concrete, one of the most important building materials, has gradually developed towards high performance, multi-function and intelligence. Concrete structures built with it also tend to be large and complex. However, due to adverse factors such as environmental loads, fatigue effects, corrosion effects, and material aging, concrete structures will inevitably produce damage accumulation, resistance attenuation, and even accidents during use. In order to effectively avoid unexpected accidents and prolong the service life of structures, real-time "health" monitoring must be carried out on such structures, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/14C04B24/26C04B24/28
Inventor 葛慎光于京华周宗辉叶正茂朱元娜马冬生殷怀磊蔡绪灿闫纪宪
Owner UNIV OF JINAN
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