The application of powder coatings in automotive parts began in the mid-1970s. For example, it was used for parts such as suspension parts, engine blanks, oil filters, air purifiers, and brake tubes. The preferred type is epoxy powder. Coatings; powder coatings for exterior metal components such as door and window assemblies, wipers, luggage racks, bumpers, etc. are based on polyester or acrylic.
These powder coatings are usually low gloss black or dark gray products. Epoxy powder coating gives the coating excellent adhesion, mechanical properties, resistance to stone impact, chemical resistance, and corrosion resistance, which can be achieved after curing at low temperature (130°C) for 15 minutes. Used for coating under the hood, can meet the requirements of use under extreme conditions. The sand-blasted cast iron engine body is directly coated with epoxy powder and rapidly solidified with short-wave infrared (160°C, 8min), followed by machining of key parts such as the surface of the cylinder head to achieve a tolerance of micron order, and is applicable. On the surface where the gasket is positioned, the coating is required to withstand high-speed machining without defects such as chipping, curling or peripheral fins. The world-class automobile manufacturers MITUBISHI, KIA, FORD, CHRYSLER, BMW, RENAULT and VVV adopt the above technologies, and the representative powder coating is INTERPONAUTOBLOCK. The components such as the oil filter and the brake tube are coated with INTERPON AUTOPAN powder coating. The filter paper is inserted and then bent around the base of the oil filter component to complete the assembly. The main performance requirement is oil resistance.
Polyester powder coatings and acrylic powder coatings have good weather resistance. Almost all external metal components can be coated with powder. Roof railings and door and window components are typical exterior trim parts. The color is usually black flat or dark gray. It requires excellent UV aging and aesthetics. This part of the paint almost occupies the automotive use. 15% of powder coating.
External durability can be measured by the instrument, such as specular gloss or drop in color value, usually combined with visual criteria, such as "gray scale." Most of the current technical standards for exterior trims require a 12-month Florida exposure. For example, Ford Motor Company required to achieve AATCC Gray Scale Level 4 (WSKM2P141). At present, some automakers have recognized that exterior trims need to meet the same high quality weathering resistance as body shells. A typical example is General Motors (GM) Inc.'s Florida Exposure (GM4367M), which requires coating performance to reach 60 months. This level of performance is called "advanced durability." Most polyester powder coatings meet the performance standards for standard durability specifications of external metal components. InterPON AUTOBODY powder coating is a representative example. "Advanced durability" is usually achieved with acrylic powder coatings.
According to experts, however, it has recently been proved that the brand new polyester powder coating with the brand name INTERPON AUTOBODY5000 has been exposed to Florida for more than 60 months, and the gloss retention rate is greater than 80%. Compared with the acrylic system, the cost is lower and it is not used. There is a problem of incompatibility between powders, which is commonly seen with acrylic powders. The germanium has been proven in European tracking records and has been adopted by vehicles produced by automobile companies such as TOYOTA, HONDA, AUDI, PSA, FORD and TAGUAR. . In addition to the improved weatherability of the polyester powder, the aesthetic appearance was also improved by 20 in one coat. With a gloss of over 90 and an image clarity value (defined by HUNTERDORIGON) of 85, it can have a similar appearance to conventional solvent-based coatings and multi-pass automotive body shell finishes.
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