Fingerprint-resistant board is a composite coated board obtained by performing fingerprint-resistant treatment on the surface of galvanized sheet. Fingerprint-resistant steel plate is the first material to pass environmental certification. Because the surface will not leave fingerprints when touched with a clean finger, it is named "fingerprint-resistant". The surface of fingerprint-resistant steel plate is smooth and flat with small tolerances.
The role of anti-fingerprint treatment
Anti-fingerprint treatment is to apply a thin, transparent organic resin film on the surface of the galvanized sheet, which can prevent the operator's fingerprints from sticking to the product during the production and processing of the galvanized sheet and affecting its appearance. product. At the same time, it can also improve the corrosion resistance of the product, improve the lubricity during the molding process, and serve as an adhesion primer for subsequent coatings.
Anti-fingerprint coating
The anti-fingerprint treatment coating is best carried out after passivation so that it can work with the passivation film to give the product a good appearance and good corrosion resistance.
There are many kinds of water-soluble resins that can be used as anti-fingerprint coatings, such as acrylic resin, polyurethane resin, etc. Acrylic resin has light color, high transparency, heat resistance, corrosion resistance, flexibility, good processability, and strong adhesion to galvanized sheets. Widely used in anti-fingerprint coatings. Polyurethane resin has strong corrosion resistance and is widely used.
Features
The initial fingerprint-resistant treatment is to form an inorganic series film, usually a silicate film, on the zinc-plated chromate passivation film, thereby making the steel plate surface fingerprint-resistant. Users have put forward higher requirements for coated products. In addition to fingerprint resistance, they also require grounding, higher fingerprint resistance and coating performance. This resulted in the development of a coated plate that forms a thin-film organic composite film on the complexate film of galvanized steel. The properties of organic and inorganic fingerprint-resistant steel plates are different. The corrosion resistance and grounding properties of organic fingerprint-resistant steel plates are better than those of inorganic fingerprint-resistant steel plates, but the fingerprint resistance index is worse. However, the corrosion resistance of both fingerprint-resistant steel plates can meet the requirements of the home appliance industry.
Type
One is to apply an organic coating (fingerprint-resistant film) on the passivation film after the galvanized plate has been passivated. The coating method mainly uses roller coating.
The other type is to add organic resin and colloidal silica to the galvanized passivation solution. After the galvanized strip passes through the passivation tank, a composite coating with corrosion resistance and fingerprint resistance is formed on the surface. The main application methods include electrolytic coating and roller coating. At present, the first process is generally used at home and abroad to produce fingerprint-resistant boards.
Traditional fingerprint-resistant boards basically use electro-galvanized sheets as the substrate. With the continuous improvement and development of hot-dip galvanizing technology and processes, the surface quality of hot-dip galvanized sheets has now reached a level comparable to that of electro-galvanized sheets. Hot-dip galvanized sheets are cheap and have better corrosion resistance, so The use of hot-dip galvanized sheets as fingerprint-resistant substrates is gradually becoming mainstream.
