Inorganic coatings are one of many inorganic materials. Even in the case of coatings only, inorganic coatings only occupy a small proportion, but they should be highly valued by people.
First of all, the base material of inorganic coatings is often taken directly from nature, so the source is very rich. For example, a coating base such as a silica sol or a silicate solution, whose main raw material is derived from quartz ore, is an extremely rich material in nature.
Secondly, compared with some organic coating base materials, the environmental pollution of inorganic coating base materials during production and use is small, and most of the products are water as dispersion medium, and have no adverse effects on environment and health.
Third, the anti-aging and certain physicochemical properties of inorganic coatings are difficult to achieve with most of the same organic production costs, so they have better technical and economic performance.
Fourth, inorganic coatings are mostly alkaline, which is more suitable for application on bases such as cement and lime sand, which are also alkaline, and can react with lime in these substrates to form calcium silicate crystals, which can be integrated with the base layer. Therefore, its adhesion is particularly good.
Development Overview:
Inorganic coatings have not been clearly defined so far. According to people's habits, generally refers to a type of coating whose main base material is inorganic material. Here, the meaning of the primary binder is that some inorganic binders (such as silica sol) must be compounded with a certain amount of organic binder to compensate for the lack of performance when formulating the coating. Since the development of architectural coatings in China in the 1970s, the base materials for the production of inorganic architectural coatings in China are mainly silica sol and silicate solutions, and from the coating varieties, there are mainly two-component potassium silicate exterior wall coatings. Silica sol exterior wall coatings, inorganic mildew coatings, inorganic fireproof coatings, inorganic thermal insulation coatings, inorganic anti-condensation coatings, cement-styrene-acrylic emulsion exterior wall coatings and acid-modified sodium water glass coatings.
Some varieties of inorganic architectural coatings have been widely used. For example, two-component potassium silicate exterior coatings used to be the main type of exterior coatings in many areas in the 1980s and early 1990s. Some of these early-coated coatings have been subjected to nearly 10 years of wind and rain erosion and natural aging, and their coatings are still basically intact. The composite exterior wall coating prepared by cold-synthesizing silica sol with styrene-acrylic emulsion or pure acrylic emulsion, because the composite process is not complicated and the coating storage is stable, especially the coating film is dense, the stain resistance is good, and the inorganic is overcome. The defects of construction coating brittleness, construction performance and decorative effect are similar to the latex paint of the same grade. Therefore, it has been considered as a coating type with superior technical and economic performance since its application. These two types of coatings are widely used throughout the country under different trade names. In addition to being made into a flat coating, it can also be made into thick coatings of different styles, such as multi-layer coatings, sand wall coatings, etc., and can also be made into lightweight ceiling sound absorbing coatings.
Inorganic coatings based on acid-modified sodium silicate aqueous solution have lower cost and maintain other properties of inorganic coatings. However, due to construction and decorative effects, although they are also used, in terms of quantity and scope. There are far fewer compared to the former, and inorganic coatings made by combining cement and styrene-acrylic emulsions are used in smaller quantities. Functional inorganic architectural coatings, namely mildew resistant coatings, fire retardant coatings, thermal insulation coatings and anti-condensation coatings, are most commonly used in inorganic fire retardant coatings, such as LG steel structural fire and heat insulation coatings (non-intumescent), E-60 expansion type. Inorganic fireproof coatings, etc., are widely used;
Secondly, inorganic anti-mold coatings have also been used due to their inherently excellent anti-mildew properties. While inorganic anti-condensation coatings and inorganic thermal insulation coatings have good performance, they are not used much because of the small amount of these two types of coatings.
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