The hottest powder coatings are widely used in aut

Powder coatings are widely used in auto parts

powder coatings are widely used in auto parts

September 6, 2018

the application of powder coatings in auto parts began in the mid-1970s, such as for suspension parts, engine blanks, oil filters, air purifiers, brake tubes and other parts. The preferred variety is epoxy powder coatings; Polyester or acrylic is the preferred system for powder coating of external metal components such as door and window components, wipers, luggage racks, bumpers, etc. These powder coatings are usually low gloss black or dark gray products. Epoxy powder coating gives the coating excellent adhesion, mechanical properties, stone impact resistance, chemical resistance and corrosion resistance. These characteristics can be achieved after curing at low temperature (130 ℃) for 15 minutes. It is used for painting the parts under the hood, which can meet the requirements of extreme environments. The cast iron engine body, which has been derusted by sand blasting, is directly coated with epoxy powder and quickly cured with short wave infrared (160 ℃, 8min), and then the key parts such as the surface of the cylinder head are machined to achieve micron tolerance, so as to obtain a surface suitable for the positioning of the gasket. The coating is required to withstand high-speed machining without defects such as chipping, curling or peripheral fins. World class automobile manufacturers mitubishi, Kia, Ford, Chrysler, BMW, Renault and VVV all adopt the above technologies, and the trademark of the representative powder coating is interponautoblock. The components such as oil filter and brake hardness drop vehicle pipe are assembled by inserting filter paper and bending around the base of oil filter components after coating with autopan powder paint, whose improvement in accuracy is limited. The main performance requirement is oil resistance. Polyester powder coating and acrylic powder coating have good weather resistance. Almost all external metal components can be coated with powder. The roof rail and door and window components are typical external decorative parts, and their colors are usually black, flat or dark gray. They are required to have excellent UV aging resistance and aesthetics. This part of the coating accounts for almost 15% of the automotive powder coating

external durability can be measured by instruments, such as the decline value of specular gloss or color, usually combined with visual standards, such as "gray scale". Most of the current technical standards for exterior decorative parts require 12 months of Florida exposure. For example, Ford Motor Company requires AATCC gray scale level 4 (wskm2p141). At present, some automobile manufacturers have realized that the exterior decorative parts need to meet the same high-quality weather resistance as the body shell. A typical example is that General Motors (GM) stipulates that its coating performance should reach 60 months Florida exposure (gm4367m). This kind of performance level is called "advanced durability". Most polyester powder coatings can meet the performance standards of the standard durability technical specifications for external metal components, and interponautobody powder coating is a representative example. The counterclockwise torque value of "advanced durability so far" is negative, which is usually achieved by acrylic powder coating

according to experts, however, it has recently been proved that the brand name of interponautobdy5000, a new type of polyester powder coating, which has been exposed in Florida for more than 60 months, has a light retention rate of more than 80%. Compared with the acrylic system, the cost is lower, and there is no problem of immiscibility between powders that is easy to occur in general acrylic powder in use. Its brilliance has been proved by tracking records in Europe, and has been proved by Toyota, Honda, Audi, PSA Used by vehicles produced by Ford, taguar and other automobile companies. In addition to improving the weather resistance, the aesthetics of polyester powder has also been improved, with a coating of 20. The gloss exceeds 90, and the image definition value (defined by hunterdorigon) reaches 85, which can have a similar appearance with traditional solvent based coatings and multiple automotive body shell finishes