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1. Before the construction of fire-resistant coatings, why clean the substrate?the construction of fire-resistant coatings, if there are water stains, dirt and dust on the substrate surface, it will affect the adhesion of fire-resistant coatings to the steel surface, thus affecting the strength of the entire coating.。2. Why does the steel structure need to be rusted?Because the rust powder of steel structure is easy to fall off, with paint, fire-resistant paint on rust powder will fall off with rust powder, can not play a decorative and fire-resistant effect, so steel structure and other paint needs to be removed rust, to ensure that paint brush on a clean surface has a good adhesion.。3. How to remove rust correctly?depends on the degree of rust
china
.1) surface rust-proof paint off or rust situation is not serious, you can use a blade to remove the skin, fall off the rust-proof paint, and then brush with wire to remove rust; 2) more difficult to remove the available gold sand polishing, until the exposed steel substrate, clean the surface, and then brush the same type of rust-proof paint two, the brush rust-proof paint must be complete, attached well; 3) If the corrosion is more serious, the steel structure has been oxidized to blacken, it must be polished with an electric grinding machine, until the metallic luster is exposed, and then according to the rust-proof paint brushing process for rust-proof paint brushing, and rust-proof paint drying, curing, before the construction of fire-resistant paint.。4. Why remove oil from the surface of the steel structure? How do I remove it?removes oil from the surface of the metal workman, enhancing the adhesion of the coating. Depending on the oil contamination, solvents with low cost, strong solubility, low toxicity and non-flammability are selected. Commonly used there are 200 roommate solvent oil, pine fuel, etc.。5. Why should the steel structure be coated with primer?coating primer is to make the steel structure component surface fireproof coating can have a better adhesion, extend the service life of fire protection coating, to avoid the paint surface caused by steel component surface rust corrosion, in its component surface base first applied a primer., the anti-rust and rust-proof primers on the surface of steel structures before the coating of fire-resistant coatings should comply with the design requirements and the relevant standards in force in the country. The aim is to create a good condition for the bonding of the surface of the protected object, i.e. the substrate and the coating film, so as to give full play to the performance of the coating film. It is the basis and key link for the whole coating process to achieve good results, so the technology of surface treatment in fireproof coating construction is valued.
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