Anti-whitening outer wall real stone paint and preparation method thereof

Abstract

The invention discloses an anti-whitening outer wall real stone paint. The real stone paint is prepared from the following raw materials in parts by weight: 300-350 parts of a basic material, 600-700 parts of quartz sand, 70-80 parts of rock slices, 2-4 parts of a defoaming agent and 2-4 parts of a sterilizing agent; the base material is prepared from the following raw materials in parts by weight: 250 to 350 parts of water, 3 to 7 parts of silica sol, 0.01 to 0.05 part of gamma-glycidyl ether oxypropyl trimethoxy silane, 600 to 800 parts of silicone acrylic emulsion, 30 to 40 parts of a coalescing agent, 2 to 10 parts of a dispersing agent, 10 to 12 parts of a defoaming agent, 2 to 4 parts of hydroxypropyl methyl cellulose ether, 0.5 to 2 parts of a pH regulator, 15 to 20 parts of propylene glycol, 8 to 10 parts of a thickening agent and 10 to 12 parts of a sterilizing agent. The silicone acrylic emulsion and the silica sol are selected, and the raw materials are synergistically matched with the coalescing agent, the dispersing agent of a specific model, the defoaming agent and the like, so that the prepared outer wall real stone paint has excellent whitening resistance and also has relatively good adhesive force, weather resistance and the like.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a real stone paint, more specifically to a real stone paint for anti-whitening exterior walls, and a preparation method of the real stone paint. Background technique [0002] Real stone paint is composed of natural color graded granular sand, resin rock flakes, natural rock flakes, high-performance resin emulsion, chemical additives and water. It has excellent aging resistance, excellent anti-fouling performance, and good UV resistance. And a decorative material with natural lychee surface style granite texture effect. At the same time, as a new type of finishing material, real stone paint has a wide range of color changes and rich shapes, and can widely replace natural stone. The safety factor is high, and the effect is similar to that of natural stone. Therefore, the application range of real stone paint is getting wider and wider. [0003] After the real stone paint coating is norma...

AI Technical Summary

Problems solved by technology

[0003] After the real stone paint coating is normally dried, the coating is prone to whitening when it encounters water, especially when the initial drying is less than 24 hours. In rainy weather, the coating will become soft and white after being soaked in water for a long time. The decorative effect is affected to a certain extent

After analysis, the reasons for the whitening of the existing real stone paint are roughly as follows: (1) The type, quality and dosage of the emulsion: the existing real stone paint mostly uses pure acrylic emulsion, styrene-acrylic emulsion, etc. as raw materials, and the effect is not good; In order to increase the stability of the emulsion, it is necessary to add an excessive amount of surfactant. The use of surfactant will reduce the water resistance of the emulsion itself; in order to save costs, some manufacturers use too low amount of emulsion, and the emulsion cannot effectively wrap pigments and fillers. After the real stone paint is dried, the paint film is loose and not dense enough, the water absorption rate of the paint film is relatively large, and the bonding strength is correspondingly reduced. Once it encounters a long period of rainy weather, the rain will penetrate into the paint film, causing the real stone paint to turn white; (2) ) The type and proportion of additives, the film-forming effect of adding film-forming aids in the proportion is poor, and wetting agents, dispersants, cellulose and other hydrophilic can reduce water resistance; (3) Curing conditions, when the real stone paint is applied If the temperature is low (80%), the moisture in the coating is too high, and the topcoat is painted under the condition of low dryness and vitrification, which will make the real stone paint inside The water in the real stone paint evaporates more slowly. When the external temperature is low or the water vapor is large, the water in the real stone paint will condense under the topcoat film, causing the real stone paint to whiten.

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