Nano core-shell structure organic-inorganic compound concrete protective agent and preparation method and application thereof

A nano-core-shell and concrete technology, which is applied in the field of building materials, can solve the problems of long time required, slow process, poor wear resistance and durability, etc., and achieve the effect of increasing service life, good effect, and improving easy aging

Inactive Publication Date: 2016-06-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above two methods can protect the concrete structure to a certain extent, they also have shortcomings. The disadvantages of organic concrete protective agents are that they have little bonding force with the cement matrix, poor wear resistance and durability, and need to be painted regularly, and organic materials are easy to Ageing
Although the above-mentioned in-situ reaction type inorganic protective agent can effectively improve the pore structure of concrete, it needs to utilize water and nano-SiO in the concrete pore structure. 2 Precursor reaction, hydrolysis to generate nano-SiO 2 The process is slow and takes a long time

Method used

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  • Nano core-shell structure organic-inorganic compound concrete protective agent and preparation method and application thereof
  • Nano core-shell structure organic-inorganic compound concrete protective agent and preparation method and application thereof
  • Nano core-shell structure organic-inorganic compound concrete protective agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] An organic-inorganic composite concrete protective agent with a nano core-shell structure, the mass percentage of its raw materials is composed of:

[0049] Polymethylhydrogensiloxane 0.5%;

[0050] Ethyl orthosilicate 6%;

[0051] Tetrahydrofuran 92.9%;

[0052] Ethylenediamine 0.1%;

[0053] Deionized water 0.5%.

[0054] The preparation method is: weigh tetrahydrofuran according to the proportion, add ethylenediamine to adjust the pH to 8-12, then add polymethylhydrogensiloxane, stir with a magnetic stirrer for 30 minutes, then add ethyl orthosilicate, continue stirring for 11 hours, and finally add Stir with deionized water for 3 hours until the solution turns from transparent to turbid, and the reaction is complete. Use a high-speed centrifuge at a speed of 10,000 rpm for 5 minutes, filter the supernatant, and collect the solid at the bottom of the centrifuge tube, which is the nano-core-shell organic- Inorganic composite concrete protective agent.

Embodiment 2

[0056] An organic-inorganic composite concrete protective agent with a nano core-shell structure, the mass percentage of its raw materials is composed of:

[0057] Vinyltriethoxysilane 1.4%;

[0058] Ethyl orthosilicate 8%;

[0059] Ethanol 89%;

[0060] Ethylenediamine 0.1%;

[0061] Deionized water 1.5%.

[0062] The preparation method is: weigh ethanol according to the proportion, add ethylenediamine to adjust the pH to 8-11, then add polymethyl hydrogen siloxane, stir with a magnetic stirrer for 30 minutes, then add ethyl orthosilicate, continue stirring for 10 hours, and finally add Stir with deionized water for 2 hours until the solution turns from transparent to turbid, and the reaction is complete. Use a high-speed centrifuge at a speed of 10,000 rpm for 5 minutes, filter the supernatant, and collect the solid at the bottom of the centrifuge tube, which is the nano-core-shell structure organic- Inorganic composite concrete protective agent.

Embodiment 3

[0064] An organic-inorganic composite concrete protective agent with a nano core-shell structure, the mass percentage of its raw materials is composed of:

[0065] Isobutyltriethoxysilane 0.9%;

[0066] Ethyl orthosilicate 6%;

[0067] Methanol 92%;

[0068] Ammonia 0.1%;

[0069] Deionized water 1%.

[0070] The preparation method is: weigh methanol according to the proportion, add ammonia water to adjust the pH to 8-11, then add isobutyltriethoxysilane, stir with a magnetic stirrer for 30 minutes, then add ethyl orthosilicate, continue stirring for 12 hours, and finally add Stir the ionized water for 3.5h until the solution turns from transparent to turbid, and the reaction is completed. Use a high-speed centrifuge, 10000rp m Centrifuge at a speed of 5 min, filter the supernatant, and collect the solid at the bottom of the centrifuge tube, which is the nano-core-shell structure organic-inorganic composite concrete protective agent of this embodiment.

[0071] Applicatio...

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Abstract

The invention discloses a nano core-shell structure organic-inorganic compound concrete protective agent and a preparation method and application therefore and belongs to the technical field of building materials. A core-shell structure material formed on the surface of nano SiO2 is wrapped in silane molecules, an organic protecting agent and an inorganic protecting agent are effectively combined, and surface layer hardened concrete is protected. The characteristic that an organic material is prone to aging is avoided, preparation and application of the material are separated, precursor hydrolysis time is saved, a dual-protection effect on a concrete structure is achieve, the advantages of the organic material and the inorganic material are integrated, on one hand, silane is laid on the surface of concrete to form a layer of protective film so that a hydrophobic effect can be achieved, and on the other hand, nano SiO2 has high pozzolanic activity and has a hydration reaction with a cement hydration product Ca(OH)2 so that hydrated gel can be generated to make the pore structure compact. The advantages of a good protective effect, easy preparation, easy construction and the like are achieved, and the nano core-shell structure organic-inorganic compound concrete protective agent can be widely applied to the field of concrete engineering.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a nano core-shell structure organic-inorganic composite protective agent for concrete, a preparation method and application thereof. Background technique [0002] Reinforced concrete is currently the most widely used man-made building material in the world, and is widely used in various engineering fields such as construction, municipal administration, and bridge construction. The quality and life of concrete are directly related to the quality and life of buildings. Therefore, the durability of concrete structures has an important impact on my country's economy, society, resources, and energy. The performance degradation of cement concrete under the action of stress and environmental factors during service is the most important factor reducing the service life of materials. The economic losses caused by the deterioration of concrete performance in the world are in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/65
CPCC04B41/4922C04B41/4961C04B41/5035C04B41/65C04B41/4535
Inventor 侯鹏坤李冉程新周宗辉王丹张秀芝张丽娜丁亚飞
Owner UNIV OF JINAN
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