What’s New in Automotive Paint Technology

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Presentation transcript:

What’s New in Automotive Paint Technology Leanora Brun-Conti Bureau of Alcohol, Tobacco, Firearms and Explosives

New Plastic Body Types Most all of the RIM (reaction injection molding, which is urethane) has been replaced with TPO (thermoplastic olefin) Rynite (polyester resin) is also used for non-metallic body parts Also, nylon and polycarbonates may be used

Coating the Non-Metallic Parts Almost all car parts, metal and plastic, are coated with BC/CC However, some flexible parts are colored in the mold to match the color of the vehicle

E-Coat Primers All metal parts are E-coated on all vehicles E-coat must be chromium and lead-free The process of E-coating: metal=>phosphate=> E-coat (1.0-1.2 mils)=> primer surfacer (~1.2mils)=> basecoat (0.4-1.0 mils)=> clearcoat (1.4-2.2 mils)

Primers: North America Solvent-based: Polyester/melamine or Acrylic/melamine Epoxy not used much in solvent-based primers Film thickness of ~1.0 mils Powder coat Chrysler is working on improving the performance of powder coat primers Powder primers are a good idea (low VOC) but they are difficult to use and it is hard to control film thickness (ideally ~1.5-2.0 mils) Epoxy acid or possibly Epoxy isocyanate

Primers Some European manufacturers use waterborne primers NOTE: Ford has a new process of a wet on wet on wet (primer on basecoat on clearcoat) Some places are using an ‘integrated system’ which means eliminating either the primer or the basecoat Some make their basecoat more ‘primer-like’ and some make their primer more ‘basecoat-like’ Regardless, one paint layer is eliminated

Stone Chip Most vehicles have some type of stone chip primer A thin film may be applied over the finished paint film unless cladding is used. Plastic cladding is a plastic film that is bolted over the coating (Cadillac SUV’s for example)

1K (one component) Topcoats 1K topcoats are not used in North America any more <2% non-US companies are using 1K

2K Urethane Clearcoats This is popular in Europe and a few Japanese companies use it Not used much by North American companies (OEM) because the unions are opposed to it.

1K Basecoats Solvent borne basecoats are mainly polyester/melamine, acrylic/melamine Waterborne basecoats are in the form of latex, however, to be more durable some cross-linking resins are added like polyurethane or polyester Waterborne systems are the dominant basecoat system

1K Clearcoats PPG uses an acid epoxy as a crosslinking agent Acid epoxy is: An acid functional group on the acrylic polymer with a low MW epoxy for cross-linking Or an epoxy functional group on the acrylic ploymer with a low MW acid for cross-linking The latter is the prefered method This may also be used in some basecoats Other crosslinking agents are melamines and carbamates

1K Clearcoats DuPont uses a trimethyl silane additive There are 2 plants in Europe that have waterborne clearcoats One BMW plant has a powder clearcoat (epoxy/acrylic)

Pigments-Aluminum Aluminum may have different morphology such as smooth or crinkled so be sure to make note of the aluminum flake appearance Manufacturers will coat the flakes with a substance known as a ‘passivator’. This will keep the aluminum from reacting with the water (in waterborne basecoats). If the aluminum reacts with the water, H2 gas forms Passivators consist of phosphate, Si, or SiO2 based materials

Application High volume, low pressure (HVLP) electrostatic spray equipment is used most of the time on most of the parts (has 80% efficiency) Hand spraying is used only on touch-ups, hard to reach places (door jams) or interiors

Application Note You may be able to tell if a spray job has been a “bell/recip” (electrostatic spray with a hand spray touch-up). In the bottom basecoat layer the aluminum flake will be oriented in random directions, where as the aluminum flake in the top basecoat layer will be orientated parallel to the surface.

Electrostatic/Hand Spray Paint Cross-section Aluminum flake Hand spray 2nd or top layer 1st or bottom layer Electrostatic spray

After-market Paints Almost all of the clearcoats are 2K urethane Basecoats can be acrylic, CAB (cellulose acetate butyrate)….many of them are waterborne basecoats

Paint Colors Paint colors follow the colors popular in the fashion industry. Since it takes about 2 years to go from inception to factory, the automotive paint color pallet is about 2 years behind the fashion industry The Color Marketing Group meets and discusses trends in color This group is made up of people from fashion, interior design, electronics and other industries that consider color an important part of their product

Pigments: Xirallic Xirallic (pronounced ‘zirallic’) is made along the same lines as the metal oxide coated mica (‘pearlescent’) pigments Instead of mica, the base particle is aluminum oxide synthetically produced for a more uniform particle The aluminum oxide is coated with a metal oxide (titanium or iron) to produce interference colors much like the ‘pearlescent’ pigments This pigment is more flashy, less satiny than the mica based pearlescent pigments

Xirallic Pigment Cross-Section METAL OXIDE (Ti or Fe) ALUMINUM OXIDE METAL OXIDE (Ti or Fe)

Hue-shifting Pigment: Chromaflair Made by Flex Products Chromaflair is used in ink in the new paper money GM uses it in some silver gray vehicles in low levels (VERY expensive pigment), also used in specialty jobs ‘Hue shifting’: the color changes when viewed at different angles (i.e.: blue to red, purple to green)

Chromaflair Cross-section MAGNESIUM FLUORIDE ALUMINUM MAGNESIUM FLUORIDE

Hue-shifting Pigments: ColorStream Made by the same manufacturer as Xirallic Cheaper than Chromaflair Consists of a metal oxide over silicon dioxide

ColorStream Cross-section METAL OXIDE (Ti or Fe) SILICON DIOXIDE METAL OXIDE (Ti or Fe)

The Future of Automotive Coatings Paint technology will continue to be driven by environmental concerns to make coatings with the lowest solvent content (low VOC) higher solids Utilizing waterborne technology in more coatings Utilizing powder coating technology in more coatings

Thanks to: Ken Perry, BASF Deb Liczwek, John Moore, Claudia Royals and Eric House of DuPont