Fingerprint-resistant sheet is a composite coated sheet obtained by fingerprint-resistant treatment on the surface of galvanized sheet. Fingerprint-resistant steel plate is the first material to pass environmental protection certification. It is named “fingerprint-resistant” because the surface will not leave fingerprints when touched with clean fingers. The research and production of fingerprint-resistant plates originated in Japan and entered commercial production in the early 1980s. The original purpose of anti-fingerprint treatment is to meet the requirements of users in the field of home appliances. In the production process of home appliances, many parts are touched many times by workers due to the needs of the process, and the sweat stains on the hands of the workers will pollute the surface of the parts and affect the appearance. Therefore, a fingerprint-resistant board has been researched and developed.
The initial anti-fingerprint treatment is to form an inorganic series film, generally a silicate film, on the zinc-plated chromate passivation film, thereby making the surface of the steel sheet resistant to fingerprints. Users have put forward higher requirements for coating products. In addition to fingerprint resistance, they also require grounding, higher fingerprint resistance and coating performance. As a result, a coated sheet in which a thin-film organic composite film is formed on a chromate film on a galvanized steel sheet has been developed. 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 these two fingerprint-resistant steel plates can meet the requirements of the home appliance industry.
One is that after the galvanized sheet is passivated, an organic coating (fingerprint-resistant film) is applied on the passivation film, and the coating method is mainly roller coating.
The other is to add organic resin and colloidal silica to the passivation solution of galvanizing. After the galvanized strip passes through the passivation tank, a composite coating with corrosion resistance and fingerprint resistance is formed on its surface. Coating methods mainly include electrolytic coating and roller coating. At present, the first process is generally used to produce fingerprint-resistant boards at home and abroad.
The traditional anti-fingerprint board basically uses electro-galvanized sheet as the substrate. With the continuous improvement and development of hot-dip galvanizing technology and process, the surface quality of hot-dip galvanized sheet has reached a level comparable to that of electro-galvanized sheet, while hot-dip galvanized sheet is cheap and has better corrosion resistance. The use of hot-dip galvanized sheet as a fingerprint-resistant substrate is gradually becoming the mainstream. In addition, in 2007, organic composite coated boards with various properties (such as fingerprint resistance, electrical conductivity, self-lubrication, paintability, etc.), which can meet various requirements at the same time, are developing rapidly.