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    Home > Coatings News > Paints and Coatings Market > Coating classification: closed polyurethane coating

    Coating classification: closed polyurethane coating

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: closed polyurethane coating is a kind of important anticorrosive coating It is a single component can coating composed of closed polyisocyanate and hydroxyl resin, also known as single component thermosetting polyurethane coating The active isocyanate group of this kind of coating is sealed by the sealer, which is stable at room temperature and can be stored for a long time Only when heated at high temperature, the sealer can be released, and the isocyanate can react with the hydroxyl group Sealer is used to block the active isocyanate containing mono functional active hydrogen The following table lists common sealers, including phenols, oximes, alcohols, caprolactam, etc Different seals 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 Home of coatings: closed polyurethane coating is a kind of important anticorrosive coating It is a single component can coating composed of closed polyisocyanate and hydroxyl resin, also known as single component thermosetting polyurethane coating The active isocyanate group of this kind of coating is sealed by the sealer, which is stable at room temperature and can be stored for a long time Only when heated at high temperature, the sealer can be released, and the isocyanate can react with the hydroxyl group Sealer is used to block the active isocyanate containing mono functional active hydrogen The following table lists common sealers, including phenols, oximes, alcohols, caprolactam, etc The temperature range of unsealing is from 200 ℃ to 100 ℃, the unsealing temperature of MEK oxime is 145-160 ℃, and the unsealing temperature of ε - caprolactam is 165-190 ℃ The sealer with low unsealing temperature is an important direction of the development of blocked isocyanate coatings It can not only reduce the unsealing temperature, but also save energy The newly developed inner sealer of urea diketone can be used in powder coating Class example: blocked isocyanate use phenol phenol cresol aromatic isocyanate Phenol Blocked TDI / TMP (trimethylolpropane) adduct, used for self welding electromagnetic wire paint, general polyurethane baking paint; Phenol Blocked TDI trimethyltoluene diisocyanate, used for high temperature electromagnetic wire paint; used for copper wire enameled wire paint oxime type butanone oxime methyl ketoneoxime Isocyanate prepolymer and amine end group polyamide are used for magnetic metal oxide coating alcohol isooctanol butanol aromatic isocyanate is used for cathodic electrophoretic paint, which is the largest application of caprolactam, caprolactam, aliphatic isocyanate, such as HDI biuret and other polyisocyanates for powder coating and coil coating The blocked isocyanates are mainly additive type (such as TDI), trimer type (such as TDI Trimer), biuret type (such as HDI biuret) For the same sealing agent, the temperature of the aromatic isocyanate is lower than that of the aliphatic isocyanate Among them, the most important aliphatic polyisocyanate derivatives are HDI and IPDI trimers IPDI derivatives are widely used in powder coatings, and HDI is used in anti stone impact coatings for automobiles The polyols used need to have special requirements, such as constant yellow at baking temperature, high boiling point of solvent, etc The closed polyurethane coating has high hardness, strong adhesion, good scratch resistance, and the coating film is not easy to peel off, which can be self soldering; it has good solvent resistance, drug resistance, and excellent electrical insulation Closed polyurethane coating is mainly used as coil coating, automobile OEM middle coating, powder coating, electrophoresis coating and enameled wire coating 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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