Calcium silicate (microporous calcium silicate) insulation material is made of silicon dioxide powder material (quartz sand powder, diatomaceous earth, etc.), calcium oxide (also useful for glass fiber weft, etc.) as the main raw material, and then add water , Auxiliaries, molding, autoclave hardening, drying and other processes. The main materials of calcium silicate are diatomaceous earth and lime from Shen. Under high temperature and high pressure, hydrothermal reaction occurs, which is different from the raw materials used as reinforced fibers and coagulation aid materials, the ratio or the production process conditions, and the resulting products The chemical composition and physical properties of calcium silicate are also different.
Calcium silicate used in insulation materials has two different crystal structures. Calcium silicate was first invented by Owence Coming Glass Fiber Corporation in the United States around 1940 . Trial, product name kaylo (kaylo), used in industrial and building insulation. Since then, the United Kingdom, Japan, and the former Soviet Union have also conducted research and production. Among them, Japan has developed rapidly, and the product density has dropped from 350kg/m3 to 220kg/m3. For tobel mullite-type products whose service temperature is below 650℃, Japan has produced ultra-light products with a density of 100-130kg/m3. In the thermal insulation products used in the thermal insulation industry in Japan, calcium silicate accounts for about 70%. The United States has produced high-strength calcium silicate with a flexural strength> 8MPa, which is used as a gasket for pipeline suspension.
In the early 1970s, my country produced and used tobermorite-type calcium acid thermal insulation products below 650°C, and used asbestos as a reinforcing fiber, mainly molded by casting, with a density of 500-1000kg/m. 30 After the 1980s, it was recast. The method is a compression molding process, which improves the internal quality and appearance quality of the product and reduces the density to less than 250kg/m3. Started production of non-asbestos calcium silicate thermal insulation products in 1 year, and began to export part of it.
Calcium silicate insulation material has been used since the 1970s to the present. In terms of molding, it has evolved from casting to compression molding; in terms of material, it has developed from asbestos calcium silicate to asbestos-free calcium silicate; in terms of performance, it has been developed from general silicic acid. Calcium has developed into ultra-light calcium silicate and high-strength calcium silicate. At present, it is an ideal thermal insulation material among hard materials.
After scientific research, the special temperature-resistant surface material and high-temperature adhesive for calcium silicate thermal insulation products have been successfully developed, and they have been widely used, which solves the problem that calcium silicate products cannot be smeared with ordinary surface materials.
Characteristics of calcium silicate insulation material
The products are light and flexible, strong corrosion, low thermal conductivity, high service temperature and stable quality.
Sound insulation, non-combustible, fire-resistant, non-corrosive, and does not emit toxic gases when used at high temperatures.
It has heat resistance and thermal stability, and is durable.
Good water resistance, long-term soaking will not be damaged.
The appearance of the product is beautiful, and it can be sawed, planed, drilled, screwed, painted, and installed. It is labor-saving and convenient.
The above information is related to calcium silicate insulation materials introduced by Fiber Cement Board Company.
Post time: Dec-02-2021