High-Weather-Resistant Colored cement tile Production Technology
As is well known, colored Cement Tiles are generally produced by injecting a cement‑based mixture into molds, followed by forming, curing, and surface coating.
The surface coating on cement tiles is susceptible to aging and fading due to ultraviolet (UV) radiation from sunlight. Moreover, coating aging shortens the service life of the tiles and requires regular maintenance. Repeated coating applications involve heavy workloads, time consumption, and high costs.
Another surface treatment method uses UV‑resistant coatings composed of pigments and silicone, polyurethane, or fluorocarbon resins, but these are expensive and typically last no more than ten years.
Recently, a high‑performance, high‑weather‑resistant colored cement tile technology has been introduced overseas and is described below.
The durability of colored cement tiles depends critically on weatherability.
The purpose of this technology is to improve weatherability and significantly extend service life.
The main feature is:
Apply a colored coating to the surface of the formed green tile to form a decorative color layer.
Then apply a fiber‑containing weather‑resistant coating that matches or is lighter than the color layer.
In this context, weather resistance refers to the ability to withstand ambient temperature changes, UV radiation, rain, and wind.
Suitable coatings for the color layer and weather‑resistant layer include acrylic‑silicone coatings and water‑based acrylic coatings, with water‑based acrylic coatings preferred.
Fine cylindrical monofilaments with a diameter of ≥ 30 μm
Length of 30 μm–200 μm
Extrude the cement‑based mixture into tile blanks.
Cure and harden the tiles.
Apply a primer coating and smooth to form a base coat.
To prevent alkali attack from the tile body, apply an alkali‑resistant sealer over the base coat.
Apply a colored coating to form a decorative color layer.
Finally, apply the fiber‑containing weather‑resistant coating to form a weather‑resistant top layer
(see Figure 1 and Figure 2).
After spraying, the tiles are thoroughly dried at about 100 °C to fix the glass fibers.
As described, the glass fiber in the coating is weather‑resistant and has rounded surfaces that effectively diffuse and reflect UV radiation, protecting the color layer.
Therefore, the weather‑resistant layer formed on the surface extends the service life of the tile under harsh outdoor conditions and maintains its strength and appearance for a long period.
The weather‑resistant coating is made by adding glass fiber to inexpensive water‑based acrylic coating, resulting in lower cost compared with special UV coatings.
In addition, when sunlight strikes the tile surface, the glass fiber in the weather‑resistant layer scatters light, giving the tile a matte finish and making the color layer appear more elegant.
UV rays are diffusely reflected by the glass fiber and cannot penetrate the color layer.
The color layer is effectively protected from aging, fading, and discoloration.
The fiber also protects the coatings and tile body from wind and rain damage.
As a result, the service life is greatly extended, and the tile maintains its strength and aesthetic appearance for a long time.
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