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    Home > Coatings News > Paints and Coatings Market > Classification and characteristics of powder coatings.

    Classification and characteristics of powder coatings.

    • Last Update: 2020-10-29
    • Source: Internet
    • Author: User
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    Although the variety of powder coatings is not as numerous as solvent-based coatings, but can be used as powder coatings of polymer resin varieties are also many. The total powder coating can be divided into thermosystic type and thermoplastic type.
    1. Thermoclytic powder coating refers to the use of thermo-solid resin as a film-forming substance, the addition of a cross-linking reaction of the curing agent after heating can form insoluble hard

    . The coating does not soften like a thermoplastic coating when the heating temperature is high, but can only be decomposed. Because the resin used in the thermoset powder coating is a pre-polymer with a lower polymerization and a lower molecular weight, the coating has better leveling, strong decorative properties, and the pre-polymer of low molecular weight can form a mesh cross-linking of large molecules, so the coating has better corrosion resistance and mechanical properties. Therefore, the thermoo-solid powder coatings are developing particularly rapidly.
    1.1 Epoxy Powder Coatings
    is the first variety to be used in thermoso-solid powder coatings due to their excellent bonding with metals, corrosion resistance, hardness, flexibility and impact strength. Epoxy powder coatings are made up of epoxy resins, curing agents, pigments, fillers, and other additives. The contribution of these components to the performance of the formed powder coating is mutually restricted and affected, a suitable formula, in fact, the result of the coordination of various components.
    1.2 polyester powder coatings
    polyester powder coatings are unique in nature compared to other types of powder coatings. In addition, because polyester resin with polar groups, so the powder rate is higher than epoxy resin, baking process is not easy to yellow, high gloss, good leveling, paint film plump, light color and other characteristics, so it has a good decorative. Generally used in refrigerators, washing machines, vacuum cleaners, instrument casings, bicycles, furniture and other fields.
    1.3 acrylic powder coatings
    acrylic powder coatings are thermoplastic and thermosteroid. The biggest advantage of thermoo-solid acrylic powder coating is that it has excellent weather resistance, color preservation, pollution resistance, strong metal adhesion, excellent appearance of coating film, suitable for decorative powder coating.
    2. Thermoplastic Powder Coatings
    Thermoplastic Powder Coatings, which began in 1950, dissolve at spray temperature and solidify into film when cooled. Due to the simple processing and spraying methods, powder coatings can only be heated to melt, level, cool or extract solidified into a film, without the need for complex curing devices. Most of the raw materials used are common polymers on the market, and most conditions meet the requirements of performance. However, there are some shortcomings, such as high melting temperature, low coloration level, and metal surface adhesion difference. Nevertheless, the commonly used thermoplastic powder coatings still show some unique properties, among which polyolefin powder coatings have excellent solvent resistance, polyfluoroethylene coatings have outstanding weather resistance, polyamide has excellent wear resistance, PVC has a better price/performance ratio, thermoplastic polyester powder coatings have the advantages of beautiful appearance, high artistry. These properties make thermoplastic powder coatings a large part of the coatings market.
    2.1 PVC powder is one of the cheapest polymers produced on a large scale in industrialization.
    it has excellent solvent resistance, good corrosion resistance to water and acid, shock resistance, salt spray resistance, to prevent food contamination and electrostitive spraying with high insulation strength. Mainly used for coating metal mesh, steel furniture, chemical equipment and so on.
    2.2 polyethylene powder coating has excellent corrosion resistance.
    chemical resistance and excellent electrical insulation and UV radiation resistance. The disadvantage is that the mechanical strength is not high and the adhesion to the substring is poor. Can be used in chemical tank grooves, imperfles, pumps, pipe walls, instrument housings, metal plates, refrigerator in-net plates, automotive parts and so on.
    2.3 Nylon powder coating
    Nylon, also known as polyamide, because the chlorine-based N atoms on the molecular chain and the hydrogen atoms on the adjacent chain segment easily form hydrogen bonds, so the melting point of polyamide resin is generally higher. Nylon has the advantages of high mechanical strength, impact resistance, hardness, wear resistance and small coefficient of friction, low vacuuming, etc., and can be used in specially requested components. Such as for pump imperms, textile machinery parts, diesel engine starting piston parts, sailboat thruster imperfles, automotive wheels, motorcycle supports, agricultural machinery, construction and sports equipment. In addition, due to nylon's salt water and inertness to mold and bacteria, it is suitable for manufacturing coatings immersed in or in contact with seawater, while nylon powder coatings are non-toxic, tasteless, not eroded by mold, will not promote bacterial growth, and are suitable for spraying parts of the food industry, drinking water pipes and food packaging.
    2.4 Fluorine Resin Powder Coatings
    Fluoropolymers are able to prepare a wide variety of powder coatings, such as Teflon (PTFE), Teflon (PTFCE), PVDF, etc. Teflon melting point of up to 327 degrees C, can be used in the range of -250 to 250 degrees C for a long time, in addition to excellent corrosion resistance, excellent dielectic performance, very low coefficient of friction and self-lubrication, so known as the "Plastic King." A large number of applications in petroleum, chemical anti-corrosion coating, sealing, bearing lubrication materials, electrical and electronic materials, marine water rails and non-stick pot coating. PVC is cheaper than PTFE, processing temperature can be reduced, coating can be used for a long time below 130 degrees C, alkali and hydrogen fluoride corrosion resistance is better than acid enamel resistance, hydrochloric acid, hydrochloride and chlorine corrosion resistance is better than stainless steel equipment. Has been widely used in chemical plants, pesticide plants, pharmaceutical plants, detergent plants and other anti-corrosion equipment. The biggest advantage of polyfluoroethylene powder coating is excellent weather resistance, high degradation resistance in outdoor exposure, and dust absorption, it is easy to maintain the original luster.
    2.5 Chlorinated polyether powder coating
    chlorinated polyether has excellent chemical stability, coating film for a variety of acids, alkalis and solvents have good corrosion resistance, anti-solubility properties, chemical stability is second only to Teflon, mechanical and frictional properties are also very good. Chlorinated polyether powder coatings are mainly used in chemical equipment, pipe lining, instrumentation equipment shell and so on. The disadvantage is poor adhesion with metal. Additives can be added to improve adhesion with metals.
    2.6 latex powder coating
    latex powder is made by drying the emulsion through spray, most of which are ethylene acetate co-oxides. Paints produced with latex powder are called latex powder coatings. On-site water mixing construction, is currently the most environmentally friendly wall paint paint.More than
    is divided according to the nature of the main film of powder coating, powder coating according to the coating method and the state of existence can be divided into electrostitive powder spray powder coating, fluidized bed immersion powder coating, electrophoresis powder coating, ultraviolet curing powder coating and water dispersion powder coating. Powder coatings according to their special functions and uses can be divided into decorative powder coatings, anti-corrosion powder coatings, weather-resistant powder coatings, insulated powder coatings, antibacterial powder coatings and high temperature-resistant powder coatings. Powder coatings can be divided into high-gloss powder coatings, glossy powder coatings, semi-gloss powder coatings, matte powder coatings, matte powder coatings, wrinkled powder coatings, sand powder coatings, hammer powder coatings, splurge powder coatings, metal powder coatings and nickel-plated effect powder coatings.
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