Antibacterial cement mortar as well as preparation and application methods thereof

Abstract

The invention relates to antibacterial cement mortar as well as a preparation method and an application method thereof. The antibacterial cement mortar is prepared from the following raw materials inparts by weight: 9.5-14 parts of cement, 0.5-1 part of metakaolin, 25-48 parts of quartz sand, 0.01-0.03 part of an antibacterial agent and 5-9 parts of deionized water. According to the invention, different nano photocatalytic materials are selected and mixed as an antibacterial main material to ensure the stability of the antibacterial effect; the antibacterial agent is respectively attached tothe surface of quartz sand, dispersed in cement and deionized water, and then mixed to prepare the antibacterial cement mortar, thereby reducing the nonuniform dispersion and material loss caused by doping in a single mode, ensuring the dispersity of the antibacterial agent in the cement mortar and the exposure number of reaction active sites, and achieving the goal of effectively resisting bacteria.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to an antibacterial cement mortar and its preparation and application method. Background technique [0002] Cement mortar is an engineering material with strength after being mixed with cement, fine aggregate and water as the main raw materials. It is mainly used in masonry, plastering and decoration projects. Because the cement mortar is exposed to the air for a long time, a large number of bacteria can easily accumulate on its surface or cracks. How to effectively alleviate the erosion and damage of bacteria to the mortar structure has gradually attracted the attention of experts and scholars. At present, it is common to spray fungicides on the surface of the mortar or apply fungicide coatings to achieve the sterilization effect. Common fungicide coatings include coatings mixed with fungicides and coatings mixed with nano-photocatalytic materials, etc., but there are p...

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Problems solved by technology

[0003] (1) The mortar is exposed to the external environment for a long time. If the bactericidal coating is directly applied to the surface of the mortar, its service life is short, and it is easy to be damaged or peeled off from the surface of the mortar; after damage or peeling, although it can be repeatedly painted and repaired, However, resources such as manpower and materials need to be continuously invested, and the maintenance cost is relatively high.

[0004] (2) Most of the commonly used fungicides are chemical preparations. Spraying fungicides on the surface of cement mortar may cause certain corrosive damage to the structure of the mortar and affect the service life of cement mortar; There is some pollution in the surrounding environment

In addition, chemical fungicides can only kill bacteria, but cannot decompose substances such as endotoxins released after death. As bacteria accumulate again, the remaining substances provide nutrients for new bacteria instead, which is not conducive to relieving bacteria. Erosion damage to mortar structures

[0005] (3) Since nano-photocatalytic materials are easy to adsorb and agglomerate, it is difficult to mix them evenly with cement and sand when directly mixed into cement or sand

Even if it is added after it is uniformly dispersed in water, its dispersibility cannot be guaranteed, and more nano-photocatalytic materials remain on the inner wall or bottom of the container, resulting in more material loss, which will cause a large error in the amount of nano-photocatalytic materials incorporated. It also affects the bactericidal effect during use

[0006] (4) The environment of cement mortar is generally complex and harsh, and the cement mortar is strongly alkaline, and the cement hydration time is longer

Nano-photocatalytic materials have problems such as reduced photocatalytic performance or structural damage in cement mortar. If only one nano-material is used for photocatalytic sterilization, once its performance is inhibited, it will seriously affect the photocatalytic effect of cement mortar.

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