Super-hydrophobic coating for alkali efflorescence resistance of cement mortar and preparation method of super-hydrophobic coating

Abstract

The invention discloses a super-hydrophobic coating for alkali efflorescence resistance of cement mortar and a preparation method of the super-hydrophobic coating. The coating comprises a cement coating which is arranged on a cement mortar base material and provides roughness, and hydrophobic emulsion is arranged on the surface of the cement coating; wherein the cement coating comprises the following components: cement, sand and pigment; in the cement coating, the mass ratio of cement to water to sand to pigment is 1: (0.5-1), the mass ratio of cement to water to sand to pigment is 1: (2-2.75), and the mass ratio of cement to water to sand to pigment is 1: (0.06-0.072). The method comprises the following steps: constructing a cement coating on a cement mortar base material; and coating the hydrophobic emulsion on the surface of the cement coating, and drying to obtain the hydrophobic cement coating. According to the invention, a layered coarse structure is formed by the micron-scale sand and the micro-nano-scale cement product, the coarse structure improves the hydrophobicity of the hydrophobic coating, reduces the usage amount of the hydrophobic agent, and improves the durability of the super-hydrophobic coating, and the super-hydrophobic mortar has waterproofness and self-cleaning property and can alleviate the saltpetering problem; and the preparation process is simple and easy to control.

Description

Technical field [0001] The present invention relates to a hydrophobic coating for cement and a preparation method thereof, and more particularly to a superhydrophobic coating for cement sander and anterior base. Background technique [0002] As a wall decorative material, the finished mortar is low in the cost, the construction is convenient, but in practical applications, the surface of the wall will have a serious degradation, the most serious is surface umpakistine, so that The appearance quality decreased significantly. One of the necessary conditions of the ubiquitiasis is that there is a water that is easy to soluble salt to the surface, in order to resist moisture, the common waterproof method mainly includes reducing the amount of mixing and water during concrete molding or by doping or hydrophobic water The agent, but these methods are easy to aging in long-term use or even drum cracking. Unlike conventional closed coatings, silicone waterproofants can rely on chemical b...

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Problems solved by technology

The paper (Construction and Building Materials, 2015: 291-297) added hydrophobic admixtures to cement mortar to prepare super-hydrophobic cement test blocks. Changed the pore distribution of cement, so that the mechanical strength of the cement test block decreased

Patent CN111777381A discloses a preparation method of colored super-hydrophobic concrete coating, mixing cement, fine sand, water, iron oxide dyes, and water-soluble low surface energy materials to prepare super-hydrophobic powder, and then spraying the super-hydrophobic powder to the unsolidified surface Superhydrophobic concrete coatings are obtained on ordinary concrete substrates, but superhydrophobic powders are easily worn on the substrates through physical bonding. In addition, low surface energy materials have an adverse effect on the strength of cement, which greatly reduces the strength of the prepared superhydrophobic coatings.

The paper (Construction and Building Materials, 2017: 393-401) first sprays the adhesive to cover the concrete surface, and then sprays the low surface energy polymer PTFE, PEEK and silanized DE (diatomaceous earth) layer by layer on the fresh adhesive. On the concrete surface of the mixture, after deposition, the low surface energy material provides a hierarchical structure to obtain superhydrophobic concrete. This method has a certain anti-slip and anti-icing properties, and it is possible to reduce the concrete pavement of roads and airport areas. winter maintenance problem, but this method is currently limited to the laboratory environment and the cost is high, and the actual application value needs to be further explored

Patent CN107244847B discloses a preparation method of high-hardness wear-resistant super-hydrophobic concrete. Through physical methods, metal mesh is used to cover the microstructure, and water-soluble low-surface-energy materials reduce the surface energy to obtain super-hydrophobic concrete materials. The microstructure of the cement will have the characteristics of large size and wide spacing, which cannot fully expose the microstructure of the cement itself, and is only suitable for flat surfaces.

Patent CN 109648695A discloses a silicone rubber formwork and its preparation method and a method of using the formwork to prepare superhydrophobic concrete. Mix cement, standard sand and water evenly, pour it into a silicone mold, and buckle it upside down on the above-mentioned silicone rubber formwork. Superhydrophobic concrete samples can be obtained after curing. The template method can quantitatively control the microstructure of the concrete surface, but the microcolumn structure formed by the template method will be subject to mechanical wear, which directly affects the surface hydrophobicity.

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