Some real stone paints have more sand loss during spraying, which can cause up to 1/3 in serious cases. It is wasteful. In addition to the construction method, raw materials and formulas may also cause the above phenomenon. The sand currently used for real stone paint has artificial sand and There are two kinds of natural sand. It is observed that the real stone paint prepared with natural sand has less sand loss than artificial sand. This may be related to the hardness and surface state of the sand. In general, it is easy to lose sand when using sand with a high hardness and a relatively smooth surface. In addition, when preparing a real stone paint, the gradation of the sand is also important. The grading of the appropriate real stone paint not only reduces the sand loss when spraying, but also the coating is tight. Therefore, it is recommended to use natural sand as much as possible in the preparation of real stone paint, and to make the sand have a certain gradation. In addition, the consistency of the paint also has an effect on the sand drop during spraying. When the coating is too thick, the construction is difficult. If the coating is too thin, the initial viscosity of the sand on the wall is too low, which will cause the sand to fall. Therefore, in the case of no difficulty in construction, the consistency of the paint is increased as much as possible, which contributes to the solution of the problem of sand loss.
The coating of good quality real stone paint should be very hard, and the nails should not be shaken. If it is used in good weather, it can still be shaken with nails after three days of construction. It should be considered that the coating is too soft. The reason why the real stone paint is too soft The main choice is that the emulsion is not appropriate. Many manufacturers use the same emulsion as the latex paint when preparing the real stone paint, which is not correct. The emulsion in the real paint formulation has a low child's content, and the coating is not tight enough due to the presence of a large amount of sandstone. Therefore, an emulsion with a higher cohesive strength and a lower film forming temperature should be selected. According to the study, the bond strength of emulsions prepared for real stone paint should not be lower than 3 MPa. The minimum film formation temperature should not be lower than 2010. The higher minimum film formation temperature may cause the film to be difficult to form at low temperatures. It can be solved by a suitable method of adding a film-forming auxiliary. The filming aid can be completely volatilized after the coating is dried, and generally does not affect the performance of the coating. At present, the use of more drunk vinegar 12 in the production of water emulsion paints also has a good effect in the use of real stone paint. The dosage is generally 5 parts per 100 parts of the emulsion. In winter, it is appropriate to add more.
The acrylic emulsion used as a granule auxiliaries should have good water resistance after drying. Therefore, the coating should not be blushing when it is exposed to water after drying. However, some real stone paints are applied after each rain. It will be white, the coating will become loose, and after the rain stops, the coating will return to its original color after being exposed to the sun. After analysis, this is due to the poor water resistance of the coating and the absorption of moisture. It is analyzed from the structure of polyacrylic acid cheese. The true stone paint coating should have good water resistance. However, since the acrylic acrylate emulsion needs to be added with a surfactant during the synthesis, some manufacturers use the surfactant to increase the stability of the emulsion. Some manufacturers add the shuttle methyl fiber dysfunction and the singular fiber to the true stone paint. The substance is used as a thickener, and sodium benzoate is added as a preservative. These substances are water-soluble or hydrophilic, and the coating remains in the coating after film formation, which greatly reduces the water resistance of the coating. The experiment shows that the pure acrylic emulsion is mixed with quartz sand without any additives. The coating formed by spraying has a water absorption rate of 0.42%; and on the basis of the above coating, 0.4% ethylcellulose is added, and the water absorption rate is increased to 4.3%. Since the coating of the real stone paint is thick, once the water is absorbed, once absorbed After that, it is not easy to release in a short period of time. Therefore, the appearance is white and the inside of the coating is loose. In order to solve the above problems, raw materials and formulations can be improved. Firstly, emulsions with excellent quality should be selected. In recent years, silicone-modified acrylate emulsions (silicone-acrylic emulsions) have good water repellency and can effectively resist moisture. Intrusion. Second, a special thickener should be chosen. The thickener has a good thickening effect and a small amount, so it does not cause a large change in the performance of the coating. There are many thickeners available on the market. Preservatives should also be selected as special materials. Recently, the silicone waterproofing liquid currently supplied on the market has been added to the real stone paint, and unexpectedly good results have been obtained. The rainwater rolls down on the surface of the coating without penetrating into the coating, which makes the real stone paint both decorative and waterproof.
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