News

steel structure coatings paint

Steel is a kind of non-burning building material, it has seismic, bending and other characteristics. In practical application, steel can not only increase the load capacity of buildings, but also meet the needs of aesthetic modeling of architectural design. It also avoids the defects that building materials such as concrete cannot bend and stretch. Therefore, steel has been favored by the construction industry, single-storey, multi-storey, skyscrapers, factories, warehouses, waiting rooms, departure halls and other steel is common. In order to learn from each other, the use of steel structure coatings and steel primer paint is essential.

Classification of steel structure coatings

Steel structure coatings mainly have two kinds of steel structure fireproof coatings and steel structure anti-corrosion coatings.
(A) steel structure fireproof paint

1. Ultra-thin structural fireproof coating

Ultra-thin steel structure fireproof coating refers to the coating thickness within 3 mm(including 3 mm), the decorative effect is good, can expand at high temperature, and the fire resistance limit is generally within 2 h of the steel structure fireproof coating. This kind of steel structure fire retardant coating is generally solvent-based system, with superior bonding strength, good weather resistance and water resistance, good leveling, good decorative characteristics; When it is subjected to fire, it slowly expands and foams to form a dense and hard fireproof insulation layer. The fireproof layer has a strong fire-resistant impact property, delaying the temperature rise of steel and effectively protecting steel components. The construction of ultra-thin expanded steel structure fireproof coating can be sprayed, brushed or rolled, generally used in the fire resistance limit requirements within 2 h on the building steel structure. There have been new varieties of ultra-thin steel structure fireproof coatings with fire resistance of 2 h or more, which mainly use polymethacrylate or epoxy resin with special structure and amino resin, chlorinated paraffin as the base binder, with high polymerization degree ammonium polyphosphate, dipentaerythritol, melamine as the fire retardant system. Titanium dioxide, wollastonite and other inorganic refractory materials are added to 200# solvent oil as a solvent composite. Various light steel structures, grids, etc., use this type of fireproof paint for fire protection. Due to the ultra-thin coating of this kind of fire retardant coating, the use of thicker and thinner steel structure fire retardant coating is greatly reduced, which reduces the total cost of the project, and makes the steel structure get effective fire protection, and the fire protection effect is very good.

2. Fire retardant coating for thin steel structure

The thin-coated steel structure fireproof coating refers to the steel structure fireproof coating whose coating thickness is greater than 3mm, less than or equal to 7mm, has a certain decorative effect, expands and thickens at high temperature, and the fire resistance limit is within 2 h. This kind of fireproof coating for steel structure is generally composed of a suitable water-based polymer as the base material, and then composed of a composite system of flame retardants, fire retardant additives, fire-resistant fibers, etc., and its fire prevention principle is the same as ultra-thin type. For this type of fireproof coating, the water-based polymer required to be selected must have good adhesion, durability and water resistance to the steel substrate. Its decoration is better than thick fireproof coatings, inferior to ultra-thin steel structure fireproof coatings, and the general fire resistance limit is within 2 h. Therefore, it is commonly used in steel structure fire protection projects with less than 2 h fire resistance limit, and spray construction is often used. In one period, it occupied a large proportion, but with the emergence of ultra-thin steel structure fireproof coatings, its market share was gradually replaced.

3. Thick steel structure fireproof coating

Thick steel structure fire retardant coating refers to the coating thickness is greater than 7 mm, less than or equal to 45 mm, granular surface, small density, low thermal conductivity, fire resistance limit of more than 2 h steel structure fire retardant coating. Since the composition of thick fire retardant coatings is mostly inorganic materials, its fire performance is stable and the long-term use effect is good, but the particles of its paint components are large, the appearance of the coating is uneven, affecting the overall beauty of the building, so it is mostly used for structural concealed engineering. This kind of fire retardant coating uses the granular surface of the material in the fire, the density is small, the thermal conductivity is low or the heat absorption of the material in the coating, which delays the temperature rise of the steel and protects the steel. This kind of fireproof coating is made of suitable inorganic binder (such as water glass, silica sol, aluminum phosphate, refractory cement, etc.), Then it is mixed with inorganic lightweight adiabatic aggregate materials (such as expanded perlite, expanded vermiculite, sea bouldering, floating beads, fly ash, etc.), fire retardant additives, chemical agents and reinforcement materials (such as aluminum silicate fiber, rock wool, ceramic fiber, glass fiber, etc.) and fillers, etc., which has the advantages of low cost. Spraying is often used in construction, which is suitable for indoor and outdoor concealed steel structures with fire resistance limits of more than 2 h, high-rise all-steel structures and multi-storey factory steel structures. For example, the fire resistance limit of the columns of high-rise civil buildings, general industrial and civil buildings supporting multi-layer columns should reach 3h, and the thick fireproof coating should be used to protect them.

(2) steel structure anticorrosive paint

Anti-corrosion coating for steel structure is a new type of anti-corrosion coating for steel structure developed on the basis of oil-resistant anti-corrosion coating. The paint is divided into two kinds of primer and top paint, in addition, its application range is wider, and the paint can be adjusted to a variety of colors according to needs. Steel structure anti-corrosion coating is suitable for sewage, seawater, industrial water, gasoline, kerosene, diesel jet fuel, gas and other storage tanks, oil, gas pipelines, Bridges, grids, power equipment and all kinds of chemical equipment anti-corrosion protection, can also be used for concrete facilities corrosion protection.

First, improve the nature of the metal: that is, alloy treatment:

Many foreign scholars have studied the influence of various alloying elements on the corrosion resistance of steel to seawater. It is found that alloy steels based on Cr, Ni, Cu, P, Si and rare earth have excellent anti-corrosion properties, and on this basis, a series of seawater corrosion resistant steels have been developed. However, due to economic and technological considerations, the above elements are not widely used in seawater corrosion resistant steels.

Second, the formation of a protective layer: that is, coating non-metallic or metal protective layer:

The metal protective layer is mainly used for phosphating, oxidation and passivation treatment of the coated metal. The non-metallic protective layer is mainly the coating of paint, plastic, enamel, mineral grease and so on on the metal surface to form a protective layer. The purpose of these two protective layers is to isolate the base material from contact with seawater, instead of reacting with seawater, thus forming protection

About us

Our company has always been adhering to the "'science and technology, quality first, honest and trustworthy , strictimplementation of ls0900l:.2000 international quality management system.Our rigorous managementtechnologicdinnovation, quality service cast the quality of products, won the recognition of the majority of users.As a professionastandard and strong Chinese factory, we can provide samples for customers who want to buy, if you need any type of paint, please contact us.