Coating classification: metal powder

Core tip: Introduction: Metal powder, i.e metal pigment, refers to the pigment formed by physical processing of metal or metal alloy, which belongs to inorganic pigment It mainly includes: aluminum silver powder pigment, pearlescent pigment, copper gold powder pigment and other metal pigments (such as nickel powder, stainless steel powder, etc.) Characteristic: Metal pigment is a kind of metal particle with sheet shape Its function is to give the product a metal color appearance with the aim or characteristic of decoration or special technological performance In fact, the uses of metal pigments can be roughly divided into surface coatings (coatings, inks, powder coatings and powder coated lithography) and plastics (color masterbatch and compounds) Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: Introduction: metal powder, that is, metal pigment, refers to the metal or metal alloy through physical processing of pigments, belongs to inorganic pigments It mainly includes: aluminum silver powder pigment, pearlescent pigment, copper gold powder pigment and other metal pigments (such as nickel powder, stainless steel powder, etc.) Characteristics: metal pigment is a kind of metal particle with sheet shape Its function is to give a metal color appearance to products with the goal or characteristics of decoration or special technological performance In fact, the uses of metal pigments can be roughly divided into surface coatings (coatings, inks, powder coatings and powder coated lithography) and plastics (color masterbatch and compounds) The common characteristics of metallic pigments are used in all applications: high metallic luster, high hiding power and the ability to form a smooth thin film Aluminum powder, copper gold powder and copper powder are the most widely used metal pigments in the world Other less used are stainless steel powder, nickel powder, zinc powder, iron powder, silver powder covered with copper, copper nickel powder and some special metal powders Metals used as pigments must have sufficient plasticity to be processed into flake like particles Representation: the larger the mesh number, the finer the particle size of the material; the smaller the mesh number, the larger the particle size of the material Sieve size is the mesh size of the sieve through which particles can pass It is expressed by the number of holes in the sieve with a width of 1 inch (25.4mm), so it is called mesh Preparation: most metal pigments are produced by physical processing to make pure metals or alloys into specific powders, such as from solid, liquid and gaseous metals into powders: ① from the gaseous state of metals into powders, such as the sublimation method to prepare ultrafine zinc powders; ② From the liquid state of metal to powder, such as gas atomization to produce aluminum powder, zinc powder and copper zinc powder; ③ from the solid state of metal to powder, such as cutting, ball milling to produce magnesium powder, aluminum powder, zinc powder, stainless steel powder and titanium powder The manufacturing method of non surface powder should be selected according to the physical characteristics of the metal to be processed, such as melting point, vaporization temperature, trigonometry and ductility, as well as the structural characteristics of the product powder, such as particle size, graupel shape, etc From the perspective of economic rationality, the method with the lowest processing cost and energy consumption is selected The choice of processing method should also pay attention to its safety Most metal powders have good reducibility Sharp oxidation will release a lot of heat and generate high temperature, which is prone to explosion Metal powder, especially heavy metal powder, is harmful to human health, so it is an important principle to ensure safety in the selection of processing methods Select different processing methods for various pure metals and alloy metals, as shown in Table 2 Aluminum powder (including aluminum powder slurry) and copper zinc powder are the most widely used metal powder color materials The production process steps of these metal powders are very similar In addition to the production of aluminum powder pigments by vacuum precipitation, all the above metal pigments are made by machining round or irregular shape metal powder into thin flake powder The first method used was to "mash" coarse metal particles with steel rods, but now most of them have been replaced by ball milling, that is, the metal powder produced by atomization method is then milled But for some aluminum pigment, it is better to choose aluminum foil as raw material There are two kinds of ball milling: dry method and wet method The wet method takes liquid as carrier, usually 200 × solvent oil, to make pigment have chemical compatibility with application system In the copper gold powder company group of America, the production of copper gold powder and copper powder is dry milling, while aluminum powder is wet milling, which is a representative production method in industry, although some manufacturers also dry milling aluminum in inert gas to produce aluminum powder pigment In any case, lubricant should be added to the ball milling process to prevent the sheet metal powder from "cold welding", and coating the particle surface to reduce oxidation, which is necessary to promote the floating characteristics of pigments After ball milling, the products are classified by screening or cyclone classifier to control the particle size range Other post-treatment also includes polishing, improving the flatness of flake particles, removing agglomerates, thus improving the brightness and dispersion of the finished pigment The surface coating can also be used to give the pigment anti loss of light and anti-oxidation performance, and improve the dispersion in water or other different media The following figure is the process flow chart of aluminum powder Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,