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Super-hydrophobic cement and preparing method and application thereof

A super-hydrophobic and cement technology, applied in the field of new building materials and their coating preparation, can solve the problems of easy freezing of ordinary concrete, easy ash on walls, poor durability, etc., achieve excellent anti-fouling, improve hydrophobic uniformity, The effect of improving the service life

Active Publication Date: 2018-07-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved: In order to solve the shortcomings of ordinary concrete such as easy freezing, poor durability in harsh environments, and easy dusting, staining, and mildew on the wall, the invention provides a super-hydrophobic cement and its preparation method and application

Method used

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  • Super-hydrophobic cement and preparing method and application thereof
  • Super-hydrophobic cement and preparing method and application thereof
  • Super-hydrophobic cement and preparing method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Under the condition of low-speed mechanical stirring at 500rpm, add 1 part of F-1061 fluorosilane, 50 parts of cement, and 50 parts of fine sand to 50 parts of absolute ethanol according to the mass ratio, and then stir at 2500 rpm for 12 hours to obtain cement fine sand solution. The modified cement fine sand solution was filtered, dried and crushed at 100°C to obtain 200-mesh superhydrophobic cement fine sand mixed powder. In order to highlight the hydrophobic effect of the modified super-hydrophobic cement fine-sand mixed powder, 50 parts of modified super-hydrophobic cement fine-sand mixed powder and 50 parts of unmodified ordinary cement fine-sand mixed powder were respectively Put it into an aqueous solution containing 1.2 parts of perfluoroacrylic acid copolymer surfactant (surfactant), 1 part of F-1061 fluorosilane, 0.5 part of hydroxyethyl methacrylate (dispersant) and 90 parts of water, and stir for 20 minutes to form Grout. Pour the stirred cement slurry in...

Embodiment 2

[0025] Under the condition of low-speed mechanical stirring at 100 rpm, 2.4 parts of fluorosilane, 150 parts of cement, and 50 parts of fine sand were successively added to 150 parts of absolute ethanol, and then stirred at a high speed of 2500 rpm for 18 hours to obtain a modified cement fine-sand solution. The modified cement fine sand solution was filtered, dried and crushed at 100°C to obtain 200-mesh superhydrophobic cement fine sand mixed powder. Under the condition of 1500rpm high-speed stirring, put the superhydrophobic cement fine sand mixed powder into the mixture containing 1.5 parts of fluorinated alkylsulfonate surfactant (surfactant), 0.6 part of fluorosilane, 0.8 part of sodium metasilicate (dispersant) , 70 parts of water in aqueous solution, stirring for 5 minutes to form cement slurry. The cement slurry was sprayed onto the surface of ordinary Portland cement blocks, and after drying naturally at room temperature, a superhydrophobic cement coating with a cont...

Embodiment 3

[0027] Under the condition of low-speed mechanical stirring at 300 rpm, 1.5 parts of alkyl siloxane, 100 parts of cement, and 150 parts of fine sand were successively added to 100 parts of absolute ethanol, and then stirred at a high speed of 2500 rpm for 48 hours to obtain a modified cement fine-sand solution. The modified cement fine sand solution was filtered, dried and crushed at 80°C to obtain 350-mesh superhydrophobic cement fine sand mixed powder. Under the condition of high-speed stirring at 1500rpm, put the superhydrophobic cement fine sand mixed powder into an aqueous solution containing 0.8 parts of fluorocarbon surfactant (surfactant), 1.5 parts of fluorosilane, 1.0 part of trisodium phosphate (dispersant), and 85 parts of water , a cement slurry was formed after stirring for 5 min. Brush the cement slurry to the facade of the exterior wall, and dry it naturally at room temperature to obtain a super-hydrophobic cement coating with a contact angle of 155° and a roll...

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Abstract

The invention provides super-hydrophobic cement and a preparing method and application thereof. The preparing method comprises the steps that cement powder, fine sand and hydrophobic modifier are added into ethyl alcohol in sequence under low-speed mechanical stirring conditions, and then high-speed stirring is conducted to obtain a modified cement fine sand solution; the modified cement fine sandsolution is filtered, dried and smashed to obtain super-hydrophobic cement fine sand mixed powder; under low speed mechanical stirring conditions, the super-hydrophobic cement fine sand mixed powderis put into an aqueous solution containing surfactant, dispersing agent and fluoroalkyl silane, and then mechanical stirring is conducted to form the super-hydrophobic cement. According to the method,a coating does not need to be prepared additionally, the technology is simple, the operation is simple, the super-hydrophobic cement is suitable for large-scale preparation and production, the overall super-hydrophobic property of obtained concrete is good, the inside is still not super-hydrophobic after abrasion, the super-hydrophobic property is not easily damaged, and the super-hydrophobic cement is applicable to various concrete application places and has a good prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of new building materials and coatings thereof, and in particular relates to superhydrophobic cement and its preparation method and application. Background technique [0002] Since 1824, Portland cement and sand and gravel have become widely used building materials in civil engineering because of their advantages of wide application range and high cost performance. Concrete prepared from them has also become the most popular artificial stone. With the development of society, the amount of concrete is also increasing day by day. However, the hydrophilicity and porous structure of the surface of ordinary concrete make its durability in harsh environments a big problem, such as corrosion of steel bars and cracking of concrete in harsh marine environments, deicing salt environments, and sulfate environments Looseness has always been a serious problem faced by the field of concrete engineering, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06C04B28/30C04B111/27
CPCC04B28/04C04B28/06C04B28/30C04B2111/00482C04B2111/27C04B24/005C04B24/02C04B14/06C04B2103/40C04B2103/408C04B22/002
Inventor 张友法王威姚道州王山林余新泉
Owner SOUTHEAST UNIV
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