General knowledge of coatings: application prospect of new antirust pigments

Key tips: 1 New antirust pigment Although the traditional antirust pigments have good antirust effect and have been successfully applied, most of them are toxic antirust pigments containing heavy metals such as lead and chromium, which bring great harm to the environment and human health With the restriction of environmental protection laws and regulations on heavy metals, the development of new low toxic and non-toxic antirust pigments is imperative 1.1 zinc phosphate modified antirust pigment Modified zinc phosphate antirust pigment is developed for the defects of traditional zinc phosphate products, such as large particle size, poor dispersion, insignificant early antirust performance, and difficult to avoid flash rust It uses phosphoric acid 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 Paint Home News: 1 Although the traditional antirust pigments have good antirust effect and have been successfully applied, most of them are toxic antirust pigments containing heavy metals such as lead and chromium, which bring great harm to the environment and human health With the restriction of environmental protection laws and regulations on heavy metals, the development of new low toxic and non-toxic antirust pigments is imperative 1.1 zinc phosphate modified antirust pigment modified zinc phosphate antirust pigment is developed for the defects of traditional zinc phosphate products, such as large particle size, poor dispersion, insignificant early antirust performance, and difficult to avoid flash rust It is composed of zinc phosphate as the main body, fine-grained treatment of pigment particles, shape control and other anionic or cationic modification, so as to solve the problems of traditional zinc phosphate antirust pigment The color of the antirust pigment is light, which is suitable for all kinds of anticorrosive primer and anti-corrosion coating with the combination of bottom and bottom It can replace all kinds of antirust pigments such as iron oxide, red lead, zinc phosphate, aluminum tripolyphosphate, zinc oxide, etc., or be used with the above antirust pigments to reduce the formula cost; it can also be used alone It has low cost and high efficiency, and is one of the most cost-effective universal antirust pigment products in China Although the content of heavy metals in zinc phosphate and its modified products is relatively small compared with red lead and chromate, they still contain heavy metals and need to be further improved At present, among the series of modified zinc phosphate products launched by Changsha Ruishi environmental protection new material Co., Ltd., MZP 409-d is an environmental protection industrial product without heavy metal, which has been widely used in the coatings for export construction machinery and environmental protection coil 1.2 zinc silicate composite antirust pigment the main component of zinc silicate composite antirust pigment is silicon oxygen tetrahedron combined with other chemical elements (mainly zinc, aluminum, iron, calcium, magnesium, etc.), which has high chemical stability, can form a compact and stable coating on the metal surface, reduce the permeability of water and oxygen ions to the paint film, and the product is environmentally friendly and non-toxic Changsha Ruishi environmental protection new material Co., Ltd is a new type of antirust pigment product which has been industrialized after years of research and development Because of its light color antirust pigment characteristics, it is especially suitable for all kinds of antirust paint system and bottom surface coating It can replace all kinds of antirust pigments such as iron oxide, red lead, zinc phosphate, aluminum tripolyphosphate, zinc oxide, etc., or it can be used with the above antirust pigments to reduce the formula cost; it can also be used alone 1.3 ion exchange type antirust pigment ion exchange type antirust pigment is a new non-toxic antirust pigment, mainly including calcium ion exchange silica gel and rare earth ion exchange silica gel Its mechanism is quite different from the above antirust pigment, which is roughly when corrosive electrolyte enters the coating film When contacting with the antirust pigment, the pigment intercepts the corrosive ion on the surface of silica and releases the corresponding calcium ion to transfer to the metal substrate When this process continues, the calcium ion layer will accumulate on the interface between the metal and the coating, thus playing a blocking role, protecting the substrate and enhancing the adhesion of the coating This kind of calcium ion exchange pigment is actually insoluble in water It has been reported that it can be used in waterborne alkyd primer in foreign countries, which has obvious antirust effect and can replace lead or chromium containing antirust pigment Shieldex antirust pigment produced by grace company is the representative product of calcium ion exchange antirust pigment Its composition is amorphous synthetic silica gel particles, while calcium ions are adsorbed on the surface of silica gel particles Shield ex antirust pigment is nontoxic, efficient and widely applicable, which can be well applied in various formulations of solvent based and water-based paint systems 2 At present, there are many kinds of antirust pigments and fillers with their own characteristics However, one kind of antirust pigment has some limitations in application, which requires several kinds of pigments to be used, even sometimes with fillers In addition to improving the rheological properties, physical and mechanical properties and reducing the cost, antirust pigments and fillers can also improve the antirust effect The filler of ultra-fine treatment or surface treatment makes use of the space separation ability to make the distribution of antirust pigment more uniform in the film, so as to save some expensive antirust pigments; the combination of physical and chemical antirust pigments can passivate and isolate the substrate by using different mechanisms Protection, such as the combination of mica iron oxide and active antirust pigment, can produce a good synergistic effect, which can not only effectively isolate air and water, make the chemical passivation film longer exist in the coating, but also improve certain mechanical properties; in the epoxy zinc rich coating, adding iron oxide red properly, while not affecting the cathodic protection of the zinc layer, the dense layer formed by iron red is more It has strengthened the protective performance of the coating At present, it has been widely used in the epoxy zinc rich coating of some companies When zinc powder is used with other flake pigments (such as mica iron oxide, mica powder, etc.), it can also reduce the formation of zinc salt, reduce the probability of bubbles, and reduce the comprehensive cost The chemical antirust pigment mainly considers the interaction between different antirust pigments, For example, the combination of zinc phosphate and aluminum tripolyphosphate can solve the problem of poor rust resistance of zinc phosphate in the early stage In addition, glass scales and stainless steel scales are often used with zinc phosphate or zinc silicate to achieve satisfactory rust prevention effect 3 The development trend of antirust pigment with the development of industrialization and the deterioration of environment, the frequent occurrence of acid rain and bad weather, also put forward higher requirements for steel anticorrosion, so efficient antirust is one of the development trends of antirust pigment; labor cost and energy With the increase of cost, the convenient application of antirust pigment will also be one of the development trends, which requires that the future antirust pigment should be refined, easy to be dispersed, stored in the paint, and convenient for later construction; environmental protection and safety are the mainstream trend of today's development, so the environmental protection and low toxicity of antirust pigment will also be a trend of research and application of antirust pigment In short, regardless of the development process of antirust pigments, the ultimate goal is high efficiency, low cost, environmental protection and non-toxic 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,