VESTAMID® In the engine compartment
A DIET FoR cars
A convenient way to reduce weight in vehicles without sacrificing safety or comfort is to replace metal wherever possible. For this purpose Evonik offers, in addition to the high-temperature polymer VESTAKEEP® PEEK, the high-temperature-stable semi-crystalline material VESTAMID® HTplus (PPA), which has been specially developed to replace classic metal applications. It can be used in add-on engine parts as well as in plastic-rubber composites. For our patented plastic-rubber composite process we also offer specially developed VESTAMID® D molding compounds.
Charge Air Duct
VESTAMID® HTplus has proven its suitability for parts in the immediate vicinity of the engine under grueling racing conditions. A VESTAMID® HTplus charge air duct has been used in a Lotus Exige sports car; this is only half the weight of the metal duct it replaces and, thanks to its extremely smooth interior walls, optimizes airflow and engine performance. In the charge air duct of charged engines, temperatures can rise to 170°C, depending on the situation.
The VESTAMID® HTplus housing of a wastegate actuator series is used at a temperature of 160C and easily withstands the demanding ambient conditions in the engine compartment.
Other application areas for VESTAMID® HTplus include gears, slide bearings, and ball bearing cages. Thanks to the reduced friction and lower abrasion of PPA, the service life of transmission components is increased and energy consumption in the application reduced.
Further InformatonVESTAMID® HTplus in cars
PLASTIC/RUBBER COMPOSITES WITHOUT ADHESION PROMOTERS
Wherever rubber parts must be durably fastened or fixed, composites consisting of a hard component and an elastomer have proven extremely useful. The hard component was traditionally metal, but to reduce weight metal components are increasingly being replaced by suitable plastic parts wherever possible. This has two additional advantages: Plastics do not corrode, and they can be efficiently processed by injection molding into parts of highly complex shape. Production of metal parts of similar complexity is extremely time- and labor-intensive; the use of plastics in the design of complex components therefore gives design engineers and parts developers considerably greater freedom.
For durable functioning of composites, particularly under dynamic load, strong bonding between the hard and soft components is of prime importance. This is usually achieved by the use of adhesion promoters. Combinations of all standard rubber grades with most metals and suitable plastics are possible. Apart from the additional work steps needed for application of the adhesion promoter, the process requires measures for protecting against emissions of the solvents generally used, and for their environmentally correct disposal.
Bonding without Adhesion Promoters
By contrast, the plastic/rubber composites patented by Evonik (K&K composites) do not use adhesion promoters: The specialty molding compounds allow strong and durable bonding to suitable rubber mixtures without the need for special pretreatment. Composites of this type are found in a wide variety of applications, for example as shock-absorbing bearings in the chassis of motor vehicles, in switch cams, and as reinforced seals in engines and machines.
The following VESTAMID® molding compounds have been specially developed for plastic/rubber composites:
VESTAMID® HTplus R1033 - contains 30% glass fibers
VESTAMID® HTplus R1035 - contains 50% glass fibers
VESTAMID® HTplus R1133 - contains 30% glass fibers
VESTAMID® DX9321 - contains 20% glass fibers, impact modified
VESTAMID® DX9322 - contains 15% grounded glass fibers
VESTAMID® DX9323 - contains 35% glass fibers impact modified
VESTAMID® DX9325 - contains 40% glass fibers, impact modified
VESTAMID® X7099 - contains 20% glass fibers
VESTORAN® - Evonik's first POLYMER for plastic-rubber composites
1985 to 1986 the first samples of the polyphenylene ether VESTORAN® were delivered and paves the way for the market launch of plastic/rubber composites (K&K composites) patently produced without the aid of an adhesion promoter. At the K´86 plastics trade fair, this cost-effective and environmentally friendly process was brought to the attention of a large number of visitors for the first time.