The development of steel structure fireproof coatings has basically formed a variety and serialization. Steel structure fireproof coatings can be classified by different methods. They can be classified into water-soluble and solvent-based types according to the dispersion system used; they can be classified into expanded and non-expanded types according to the fireproof form; It is divided into outdoor and indoor. Classified from thickness, there are thick coating, thin coating and ultra-thin. At present, the commonly used varieties of medium-thick coating type and thin coating type are basically water-soluble type, and ultra-thin type is water-soluble type and solvent type. The thin coating type and the ultra-thin type are basically expansion type, and the thick coating type is non-expansion type. The classification from the thickness of the steel structure fireproof coating is relatively representative. At present, this classification method is used more, so the focus is to Thick coating, thin coating and ultra-thin classification methods are introduced for steel structure fireproof coatings.
1. Thick coated steel structure fireproof coating
Thick coated steel structure fireproof coating is also called steel structure fireproof and thermal spray coating. The so-called thick coated steel structure fireproof coating is
Refers to the coating using a coating thickness of 8 ~ 50mm. The fire resistance limit of this type of steel structure fireproof coating is 1.0~3h. This kind of steel structure fireproof coating is composed of suitable binder, and is composed of inorganic lightweight materials and reinforcing materials. The construction is mostly sprayed, and it is generally applied to steel structure builders whose fire resistance limit is above 2h. In the fire, the coating does not expand substantially, relying on the non-combustibility of the material, low thermal conductivity and the heat absorption of the material in the coating to delay the temperature rise of the steel and protect the steel components. This coating has a coating appearance that is not ideal.
Second, thin coated steel structure fire retardant coating
The coating uses a steel structure fireproof coating with a thickness of 3~7mm, which is called a thin coating type steel structure fireproof coating.
The coating can be expanded and foamed when fired, and the fire-resistant thermal insulation layer formed by expansion foaming is used to delay the temperature rise of the steel and protect the steel member. However, the foaming rate is not high, the decorative property is better than the thick coating type, and the construction is mostly sprayed, and it is generally used on the construction steel structure whose fire resistance limit is not more than 2 hours.
Third, ultra-thin steel structure fire retardant coating
The so-called ultra-thin steel structure fireproof coating refers to the steel structure fireproof coating with a thickness of not more than 3mm.
The steel structure fireproof coating is expanded and foamed by fire to form a dense fireproof heat insulation layer, which retards the temperature rise of the steel and improves the fire endurance of the steel member. The construction can be sprayed, brushed or rolled, and is generally used on construction steel structures with a fire resistance limit of less than 2 hours. Because this coating has a thin coating, it has a good decorative appearance, meets the requirements of fire protection, and meets the requirements of decorativeness, especially for bare steel structures. In addition, the coating is convenient to construct and is currently a popular steel structure fireproof coating. The domestic varieties of such coatings are solvent-based and water-soluble ultra-thin expanded steel structure fireproof coatings developed by the Sichuan Fire Research Institute of the Ministry of Public Security.
Fourth, outdoor steel structure fire retardant coating
Outdoor steel structure fireproof coating refers to steel structure fireproof coating which can be used in outdoor environment, and is mainly used in outdoor steel structures such as outdoor buildings and petrochemical enterprises. At present, there are few varieties of such coatings, and most of the applications in the engineering are thick coating types. These products include indoor and outdoor ultra-thin expanded steel structure fireproof coatings researched by the Sichuan Fire Research Institute of the Ministry of Public Security, and the outdoor steel structure fireproof coatings with excellent performance are still to be further researched and developed.
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