Advantages and Considerations of Real Stone Paint
The production process of true stone paint is simple, cost-effective, and has excellent performance, with broad prospects for developing higher-end products, such as environmentally friendly, high elasticity, and dust-resistant series.
It is suitable for concrete or cement interior and exterior walls, as well as brick walls, and substrates like asbestos cement boards, wooden boards, gypsum boards, and polyurethane foam boards. The surface of the substrate should be flat, clean, and have good strength. New walls should be allowed to dry for a month before construction, while old walls need to be leveled and free of loose, peeling surfaces and dust before construction.
To meet the increasingly personalized development needs of the high-end architectural decoration industry, such as the development of imitation marble and granite coatings, the importance of spraying technology is further highlighted. Only with more complete and compatible construction processes can the unique appearance and superior performance of true stone paint be fully displayed.
High-end true stone paint must be matched with strict construction processes. Although the quality of the paint is good, if the construction personnel lack experience and have low quality, or do not fully understand the performance of different true stone paints, various problems may arise.
Coating Hardness
The coating of true stone paint becomes very hard after drying, and cannot be scratched with a fingernail. If a general true stone paint can still be scratched with a fingernail three days after application in good weather, it should be considered too soft, mainly due to the inappropriate choice of emulsion.
When preparing true stone paint, they use the same emulsion as that for latex paint, which leads to a lower emulsion content in the true stone paint formula. The presence of a large amount of sand and gravel makes the coating not dense enough during film formation. Research by paint developers indicates that the bonding strength of the emulsion used for true stone paint preparation should not be less than 3MPa, and the minimum film formation temperature should not be lower than 15°C. A higher minimum film formation temperature may cause difficulties in film formation at lower temperatures, which can be resolved by appropriately adding more film-forming aids. Film-forming aids can completely evaporate after the coating dries and generally do not affect the performance of the coating. True stone paint selects a composite emulsion with higher bonding strength and a higher minimum film formation temperature, fundamentally solving the problem of the coating being too soft.
The coating has good water resistance, stable coloring, does not turn white, and has no color difference.
Some true stone paint coatings turn white after each rain, becoming loose, but return to their original color after the sun shines on them once the rain stops. This is actually due to poor water resistance of the coating, which absorbs moisture. The formula reason is that the acrylic emulsion used requires the addition of surfactants during synthesis. Some manufacturers greatly exceed the amount of surfactants used to increase the stability of the emulsion; others add substances like carboxymethyl cellulose and hydroxyethyl cellulose as thickeners, as well as sodium benzoate as a preservative. These substances are water-soluble or hydrophilic, and when left in the coating after film formation, they significantly reduce the water resistance of the coating. Experiments show that mixing pure acrylic emulsion with quartz sand without any additives results in a water absorption rate of 0.42%; however, adding 0.4% hydroxyethyl cellulose to the above paint increases the water absorption rate to 4.3%. Due to the thickness of the true stone paint coating, once it absorbs moisture, it is not easy to release it in a short time, resulting in a white appearance and a loose internal structure. The film-forming aid selected for true stone paint ESE is an organic silicon modified acrylic emulsion (silicone-acrylic emulsion). After drying, it has good water resistance, so the coating does not turn white when it encounters water after drying.
As people's decorative requirements for interior and exterior wall coatings increase, natural true stone paint is becoming increasingly popular due to its unique appearance and performance. Many high-end residences, courtyards, and even high-rise buildings have requested coatings that closely resemble the appearance of natural granite and marble, with performance requirements for high hardness, waterproofing, and aging resistance. Below, based on some of our experiences, we will briefly introduce the formulation and spraying process of natural true stone paint. Paint, ink, resin, adhesive, formulation: 1. Natural true stone paint is mainly made from high molecular polymers, natural colored stone sand, and related additives. After drying and curing, it becomes as hard as stone, has the effect of imitating natural stone, strong adhesion, weather resistance, water resistance, and is easy to repair. The accompanying construction includes alkaline-resistant sealing primer and weatherproof protective topcoat.
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2020-08-06
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