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    Home > Coatings News > Paints and Coatings Market > Coating technology: characteristics and application of metallic pigments

    Coating technology: characteristics and application of metallic pigments

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: the commonly used metal powder is aluminum powder, zinc powder, lead powder, and the alloy form metal powder is copper zinc powder (commonly known as gold powder), zinc aluminum powder, stainless steel powder, etc Compared with other pigments, metal pigments have their own characteristics Because the powder metal pigment is composed of metal or alloy, it has bright metallic luster and color Therefore, many metal pigments are used as decorative pigments, such as copper zinc powder, whose hues range from light gold to red gold, making the painted items colorful; aluminum powder, silver white, is also used for decoration In recent years, a new type of aluminum powder, flash aluminum powder and transparent pigment are used together to coat the surface Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Coating home news: commonly used metal powder is aluminum powder, zinc powder, lead powder, alloy form of metal powder is copper zinc powder (commonly known as gold powder), zinc aluminum powder, stainless steel powder, etc Compared with other pigments, metal pigments have their own characteristics Because the powder metal pigment is composed of metal or alloy, it has bright metallic luster and color Therefore, many metal pigments are used as decorative pigments, such as copper and zinc powder Its color phase ranges from light gold to red gold, which makes the painted articles colorful; aluminum powder color is silver white, which is also used for decoration In recent years, a new type of aluminum powder, flash aluminum powder, is used in combination with transparent pigments The coating surface not only has metal highlights, but also is colorful, with very good decorative effect The flake like zinc powder is slightly light colored metal light, which can make the coating and surrounding scenery mix together, with camouflage effect Most metallic pigments are flake like powders, which are mixed into the film-forming materials and when coating the film-forming materials, they are parallel to the coated materials, connected with each other, covered with each other, arranged in multiple layers, forming a barrier Metallic scales block the micro pores of the film-forming materials, and prevent harmful gas or liquid from outside in the film-forming materials In addition to the shielding ability, zinc powder also has the function of cathodic protection A large number of zinc powder are connected to each other in the coating to form a conductive layer When the coating encounters electrochemical corrosion, because zinc has a negative electrode potential difference compared with iron, it is first corroded, thus protecting the steel substrate Stainless steel powder has good chemical stability and can prevent chemical corrosion The metal powder with light color and high luster also has the ability of heat preservation This kind of metal powder hardly absorbs light and can reflect visible light and ultraviolet light, as well as thermal radiation Therefore, it can be used on the articles that need heat preservation and prevent light and thermal radiation, such as the tanks and towers where oil and gas are stored The metal powder can reflect more than 60% of the ultraviolet light in the sun, so it can prevent the film from UV light Irradiation aging is beneficial to prolong the life of the coating Metal pigment is a very fine powder, and most of them are flakes, but there are also spherical, water drop and dendrite, which are all related to the manufacturing method Metal powder has pigment characteristics only after surface treatment, such as dispersion, covering power, etc different surface treatment can make metal lipophilic or hydrophilic to meet the requirements of different coatings Most metal pigments are produced by physical processing, which makes pure metals or alloys into specific powders, such as the transformation from solid, liquid and gaseous metals to powders 1、 From the gas phase state of metal to powder, such as sublimation method to prepare zinc powder and ultrafine aluminum powder 2、 From the liquid state of metal to powder, such as the preparation of aluminum powder, zinc powder and copper gold powder by pneumatic atomization 3、 From the solid state of metal to powder, such as cutting method, ball milling method to produce magnesium powder, aluminum powder, stainless steel powder and titanium powder The metal pigments commonly used in powder coatings are mainly aluminum powder, copper powder and pearlescent powder Because the resin or curing agent selected for powder coating contains either alkali or certain acidity, which will have a certain degree of influence on these metals and metal oxides, so the surface treatment of metal pigments is particularly important Although most metallic pigments have been treated before they leave the factory, it is questionable whether they can stand the test of powder coating construction conditions (200 ℃ for 10 minutes) The surface of copper powder can be protected by benzotriazole and so on There is no way to deal with the chemical unstable aluminum powder Therefore, the silver fine art powder coating will appear blackening after one stage of use Nickel powder is yellow in colorless transparent resin If it is combined with other colorless transparent resin, it can be made into gold, orange and yellow green coating If the color coating is to be made in the powder coating containing metal pigment, its covering force should depend on the metal pigment rather than the coloring pigment It's better to choose the pigment with lower covering power or transparent pigment, especially to use less or not titanium white carbon black Because the existence of high hiding power pigments will make the metallic pigments pale 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,
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