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    Home > Coatings News > Paints and Coatings Market > Coating classification: environmental protection antirust pigment (2)

    Coating classification: environmental protection antirust pigment (2)

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Key tips: main varieties of environmental protection antirust pigments: (VIII) calcium phosphate Calcium phosphate antirust pigment is a kind of new and efficient non-toxic antirust pigment, which has been rarely studied in China Calcium phosphite has been developed abroad in the 1990s Both the United States and Japan have patent reports on the application of calcium phosphite in coatings In recent years, the preparation and properties of calcium phosphite pigments have been studied in China Tu minduan et al Used nontoxic calcium phosphite as the main antirust pigment and phosphate as the auxiliary antirust pigment to develop an environment-friendly calcium phosphite antirust coating The test results show that the Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings news: the main varieties of environmental protection antirust pigment: (VIII) calcium phosphate calcium phosphate antirust pigment is a new type of high-efficient non-toxic antirust pigment, which is rarely studied in China Calcium phosphite has been developed abroad in the 1990s Both the United States and Japan have patent reports on the application of calcium phosphite in coatings In recent years, the preparation and properties of calcium phosphite pigments have been studied in China Tu minduan et al Developed an environment-friendly calcium phosphite antirust coating by using nontoxic calcium phosphite as the main antirust pigment and phosphate as the auxiliary antirust pigment The test results show that the antirust performance of calcium phosphite coating is equivalent to that of red lead antirust coating, which is superior to zinc chrome yellow, aluminum dihydrogen tripolyphosphate, zinc oxide and zinc phosphate antirust coating The main component of hydroxyapatite is CA10 (PO4) 6 (OH) 2, which is mainly used as inorganic biomaterial, environmental functional material, gas sensor, column chromatography packing, catalyst and laser substrate material According to the research of j.h.park and others, hydroxyapatite can be recycled from waste slime by semi continuous process, and it can be used as environment-friendly antirust pigment, and its antirust performance and mechanism are studied The results show that the antirust coating with hydroxyapatite has a large water absorption, and the antirust mechanism is that in the presence of water, the soluble component of hydroxyapatite reacts with iron to form iron phosphate, and a passive film is formed on the metal surface, which prevents the corrosion of metal Compared with other antirust pigments, it is found that the antirust efficiency of hydroxyapatite is higher than that of red lead, zinc potassium chromate and other traditional antirust pigments, or at least can be compared with them B Del Amo et al Studied the application of acid calcium phosphate in alkyd resin antirust coating The passivation film composed of iron hydroxide was formed on the surface of iron and steel The iron phosphate formed by the reaction of acid calcium phosphate and iron blocked the pores on the film At the same time, the filler composed of zinc oxide and calcium carbonate reduced the coating Permeability improves the passivation degree of steel and achieves the best anti-corrosion effect (9) Molybdate series molybdate antirust pigment is white, which has good coloring power and covering power It is commonly used in primer and topcoat The molybdate ion MoO42 - released by this kind of pigment is adsorbed on the metal surface of iron and steel, forming a complex with ferrous ion Due to the role of oxygen in the air, the ferrous ion is transformed into high-iron ion, and the composite formed is insoluble, so a protective film is formed on the metal surface, resulting in the passivation of the metal surface, which plays an anti-corrosion role Application status: there are few reports on this pigment in China, but it has been used in high performance anticorrosive coatings abroad Sherwin Williams company has successfully developed a series of molybdate pigment products, among which the second generation modified molybdate antirust pigment moly white mzap (calcium zinc molybdophosphate) has better antirust performance than chromate B Del Amo et al Studied the properties of the coatings prepared by zinc molybdenum phosphate in various resins The results showed that the coatings showed the best antirust performance in epoxy resin and chlorinated rubber resin coatings 50 Veleva et al Studied the use of zinc molybdophosphate and zinc oxide in the formulation of epoxy coatings The results showed that in the presence of zinc oxide, due to the mutual attraction of positive charges on the surface of molybdate anions and zinc oxide particles, the formation of zinc hydroxide from zinc oxide and the decomposition of zinc molybdophosphate were prevented At the same time, a complex barrier layer was formed on the metal surface, which improved the system Anti rust performance (10) Borate Series in borates, known as calcium salt, barium salt and zinc salt The theoretical chemical formula of barium metaborate is [BA (Bo 2) 2 · H2O], the relative molecular weight is 241.0, the density is 3.25-3.35g/cm3, the refractive index is 1.55-1.60, and the oil absorption is 30% The unmodified barium metaborate is easy to absorb moisture and agglomerate in storage and transportation, and has poor compatibility with various resins and firmness in paint film It can be used as anticorrosive pigment only after modification Modified barium metaborate can be prepared by coating barium metaborate with amorphous hydrated silica Mechanism: it is based on its micro solubility and alkalinity Its alkalinity can neutralize free acid, especially when carbon dioxide in the atmosphere enters the paint film, which prevents the formation of basic carbonate on the surface of iron; the barium ion and metaboric acid ion released by its micro solubility make the corrosive anode reaction in the opposite direction, which prevents the reaction of hydrogen oxide and divalent iron ion; the barium ion can react like zinc ion to form metal soap, which can reduce the formation of metal soap The water permeability of the paint film improves the antirust ability of the paint In addition, the powdering resistance of modified barium metaborate also makes the antirust effect better 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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