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    Home > Coatings News > Paints and Coatings Market > Paint knowledge classification of bridge paints for railway steel bridges in China

    Paint knowledge classification of bridge paints for railway steel bridges in China

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: the bridge paint classification 1 red lead antirust paint red lead antirust paint is a traditional antirust primer with excellent performance and low price It is generally believed that the anti-corrosion ability of the red lead pigment comes from the lead soap formed by fatty acids and lead in oil, which is a kind of corrosion inhibitor However, it is also believed that the protection effect of red lead pigment is related to the polarization of cathodic and anodic corrosion reactions The cathode reaction of iron matrix is polarized by the formation of low solubility Pb compounds, while the anode reaction is polarized by the formation of insoluble Fe compounds from soluble Fe, which are deposited in the metal lattice together with Pb oxides and hydroxides Because of the existence of lead poisoning Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Coating home news: the bridge paint classification 1 red lead antirust paint red lead antirust paint used for railway steel bridge in China is a traditional antirust primer with excellent performance and low price It is generally believed that the anti-corrosion ability of the red lead pigment comes from the lead soap formed by fatty acids and lead in oil, which is a kind of corrosion inhibitor However, it is also believed that the protection effect of red lead pigment is related to the polarization of cathodic and anodic corrosion reactions The cathode reaction of iron matrix is polarized by the formation of low solubility Pb compounds, while the anode reaction is polarized by the formation of insoluble Fe compounds from soluble Fe, which are deposited in the metal lattice together with Pb oxides and hydroxides Due to the existence of lead poisoning, in order to protect the environment, red lead antirust paint is gradually replaced by other antirust primers, but as a permanent important steel structure, railway steel bridges are still widely used in China Red lead antirust paint can be red lead phenolic antirust paint or red lead alkyd antirust paint, in which the content of red lead in non-volatile matter is not less than 65% Zinc rich primer zinc rich primer is a kind of cathodic protection heavy-duty anticorrosive coating, which is divided into inorganic zinc rich primer and organic zinc rich primer Inorganic zinc rich primer includes water glass type and hydrolyzed ethyl silicate type The former is used as primer on steel bridge Water glass type inorganic zinc rich primer is also known as water-based inorganic zinc rich primer Most of the waterborne inorganic zinc rich primers used in China are of the secondary curing type, which is composed of sodium silicate (foam alkali) and zinc powder After the coating film is formed, the curing agent should be applied to make the coating solidified At present, the water-based self-fixing inorganic zinc rich coating has been used in China's railway, which is mainly composed of potassium water glass and zinc powder The coating can achieve complete self-curing in a few hours without rain, which greatly shortens the construction period It has been used in Dingxiang bridge and Changshou bridge of Chongqing Huaihua railway Organic zinc rich primer is mainly epoxy zinc rich primer Because of the good adhesion between epoxy resin and steel substrate, the amount of epoxy resin is large 3 According to the idea that the photo like pigment can prolong the weathering life of the top coat, the top coat of grey micaceous iron alkyd was developed in 1978 Using micaceous iron as the main raw material, using its sheet structure, chemical inertness and other characteristics, the coating's weather resistance life has also reached more than 10 years In 1993, gray aluminum graphite alkyd top coat was developed for railway steel beam, which is also called 018-2 alkyd top coat Among them, the pigment is made of flake aluminum powder graphite composite material, which has a weatherproof life of more than 15 years 5 acrylic aliphatic polyurethane topcoat clearly stipulates that aliphatic isocyanate, hydroxy acrylic resin and weather resistant pigment are used to prepare polyurethane topcoat, and its weather resistant life can reach more than 20 years Fluorocarbon topcoat fluorocarbon topcoat is also known as fluorine-containing polyurethane topcoat in foreign countries Because of the C-F bond, the bond energy is 485kj / mol, and the strong inter atomic binding force, it is more resistant to atmospheric exposure, acid, alkali, salt and other harmful media, and its light retention is far better than polyurethane topcoat, which is more suitable for anti-corrosion coating of steel structures with landscape requirements 7 polyurethane upper cover plate coating wear-resistant coating is used for the top surface of the upper cover plate of the longitudinal beam, upper bearing plate beam and box beam of the railway steel bridge It is composed of two coats of Tan polyurethane primer (50 μ m minimum thickness of each dry film) and four coats of grey polyurethane cover paint (40 μ m minimum thickness of each dry film) This coating system is characterized by good wear resistance 8 grey micaceous iron epoxy intermediate paint has excellent adhesion and sealing performance on zinc rich primer and zinc and aluminum spraying layer of iron and steel As the intermediate sealing coating of epoxy zinc rich primer, water-based inorganic zinc rich primer and other high-performance antirust paint, it can enhance the inter layer adhesion and protection performance of the whole coating It can be used with epoxy, polyurethane and chlorinated rubber coatings, as well as alkyd, phenolic and other traditional coatings 9 epoxy asphalt coating is mainly used for coating the inner surface of unsealed box girder Generally, 4 coats are applied, and the minimum thickness of each dry film is 60 μ M 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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