Self-healing material and preparation process thereof

A self-healing material and self-healing technology, applied in sol preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problem of destroying the arrangement and design of hollow fibers, no commercialization, and no cheap mass production of microcapsules, etc. problem, to achieve the effect of simple and effective preparation and use, and low cost

Active Publication Date: 2015-12-23
NANO & ADVANCED MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, microencapsulated sodium silicate silica (SiO 2 ) content is low and viscous, which causes it to seldom penetrate into microcracks, so that the repair efficiency of concrete is very low
There are also some self-healing concretes using hollow fibers and hollow glass tubes, none of which are commercialized
Also, concrete vibrators used during construction can destroy the hollow fiber arrangement and design, resulting in premature loss of self-healing agents
Furthermore, the use of bacteria and calcium lactate as a self-healing agent in clay granules leads to an expensive total price (e.g. 160 EUR / m3) and its initial compressive strength is 25% lower than that of normal concrete
In summary, so far, microcapsules are not cheap enough to be suitable for large-scale production, and in the existing process, the synthesis conditions and parameter settings are environmentally unfavorable and difficult to scale up
In addition, there is also the problem of slow response between the microcapsules and the repair mechanism during the occurrence of microcracks.

Method used

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  • Self-healing material and preparation process thereof
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  • Self-healing material and preparation process thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0082] During the preparation of self-healing concrete, any suitable amount of surfactant can be added. Suitable surfactants include all commercially available surfactants for the preparation of concrete mixtures. Examples of surfactants used in concrete mixtures include chitosan, polyethyleneimine, polyethylene glycol bis(2-aminoethyl), poly(diallyl ammonium chloride), poly(2-methyl Acryloyloxyethyltrimethylammonium chloride-acrylamide) (poly(acrylamide / 2-methacyloxyehtytrimethylammoniumbromide)), poly(L-lysine hydrobromide) (poly(l-lysinehydrobromide)), poly (N-vinylpyrrolidone), poly(vinylamine) hydrochloride (poly(vinylamine)hydrochloride), poly(2-vinylpyridine, poly(2-vinylpyridine N-oxide)) (poly(2-vinylpyridineN -oxide)), poly(N-vinylpyrrolidone / 2-dimethylaminoethylmethacrylate) (poly(N-vinylpyrrolidone / 2-dimethylaminoethylmethacrylate)), poly(4-aminostyrene), poly(aniline) , poly(methylvinylnitrosamine) and poly(allylamine hydrochloride).

[0083] The present applic...

Embodiment 1

[0085] Microcapsules were prepared in a 100mL beaker, and at a stirring speed of 500rpm, 30mL of an aqueous colloidal silica solution was emulsified in an organic phase comprising toluene (64mL) and 5wt.% POEDO with 85 (Sorbitan Trioleate) Binary Mixture. After emulsifying for 10 minutes, add a solution containing an appropriate amount of monomer (15wt.% MDI) in toluene and two drops of catalyst DBTL for polymerization, and stir at a speed of 900 rpm for 160 minutes at 63°C to form a polymer cross-linked shell and encapsulate the silica nuclear material. The prepared microcapsules were further washed twice with toluene to remove residual MDI. The reagents used during emulsification and polymerization are summarized in Table 2 and Table 3.

[0086] Table 2 Reagents used for silica sol emulsification

[0087]

[0088] Table 3 Reagents used for silica sol polymerization

[0089]

[0090] To investigate the morphology and properties of the microcapsules, the characteriz...

Embodiment 2

[0097] Twelve beams (30cmx10cmx4cm) were prepared with the composition ratio in Table 1 for the flexural strength test. A mixture of 7.84 kg of cement, 11.76 kg of sand, 15.68 kg of rock and 2.74 kg of water, 570.24 g of SP8 and 792 mL of the microcapsules from Example 1 were all contained in the concrete mix and injected into the beam mould. After one day, the samples were peeled from the molds and immersed in water for 14 days to fully cure.

[0098] Flexural strength test

[0099] The flexural strength program adopts ASTMC78 / C78M-10 and BS1881: Part118, and the sample size is 22.5cmx7.5cmx3.5cm. Each sample was subjected to an applied load of 0.50 mm / s in a four-point bending apparatus. Green strength is determined by applying a load to the sample to failure. To induce microcracks, samples were loaded to 80% of their initial strength, repaired for a few days, and tested again to failure again.

[0100] Such as Figure 8 As shown, the results for the initial sample an...

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Abstract

The present application provides a self-healing material which comprises silica sol as self-healing agent encapsulated by a polymeric shell. The self-healing material may be further embedded in a concrete mixture to heal micro-cracks in concrete. A method for preparing the self-healing material is also provided.

Description

technical field [0001] The present application relates to self-healing materials and methods for their preparation. Background technique [0002] Concrete is a low-cost and most commonly used material in industry and is still considered an indispensable building material to this day. This is mainly due to its compressive strength and durability. However, due to the long-term influence of the surrounding environment, micro-cracks and damage of concrete materials are inevitable. Microcracks are particularly difficult to detect due to the limitations of existing technologies. Therefore, it is difficult to repair such hard-to-detect cracks. When the cracks are not repaired in time and effectively, it will lead to the formation of large cracks, causing brittle damage and shortening the life of concrete, which also threatens the safety of the structure. In addition, the inspection and maintenance of large cracks is difficult and expensive, and its labor cost rises to 50% of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06B01J13/16C04B28/00
CPCC04B28/02C04B20/1033C04B20/1037C04B40/0633C04B40/0675B01J13/02Y10T428/2989Y10T428/2993C01B33/145C04B12/04C04B24/282C04B24/2676C04B14/062B01J13/0008B01J13/14
Inventor 姜乐恒谭诺彬蔡颖豪林炜泽
Owner NANO & ADVANCED MATERIALS INST
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