08/02/2010

Cannon S.p.A.

CANNON AND DiCycloPentaDiene (DCPD): A VERY COST EFFECTIVE ANSWER


DCPD is the most advanced solution for the manufacture of large parts, from low to high volumes, with a very large
range of applications.

DCPD RIM Resins are liquid resins based on highly purified DiCycloPentaDiene (DCPD). Mixed under pressure, the
chemical reaction of components A and B gives the thermoset polymer. Reaction Injection Moulding (RIM) of the lowviscosity
resins is the preferred method of production of DCPD parts.
DCPD RIM polymers have high rigidity, excellent impact resistance, as well as good surface appearance and corrosion
resistance for a wide range of applications.

The DCPD catalyst system makes it possible to control the starting point of the reaction. This opens up the processing
window to the moulder by increasing the time available to fill the mould. This makes it possible to make very large plastic parts (up
to 100 Kg and over) in a very short time.
DiCycloPentaDiene, or DCPD, is a product obtained from the steam-cracking process. In its highly purified form, it can be
polymerised by the so called "metathesis" chemical reaction which gives rise to a cross-linked 3-dimensional polymer
structure. The DCPD A and B components are liquids and contain a catalyst and a co-catalyst respectively. These promote
the chemical reaction only when the two components are mixed together in controlled conditions. We make use of this
metathesis reaction in Reaction Injection Moulding (RIM) processing for the industrial production of DCPD Polymers.
DCPD Resins contain also additives to improve the processability of the liquid resins, for example by lowering the
freezing point down to 0° C. The choice of the additives and comonomers is carefully engineered to further enhance the
properties of the DCPD polymers.
DCPD stands apart from all other liquid resin RIM systems because of the unique patented catalyst system. This catalyst
system makes it possible to vary the gel-time (which marks the start of the polymerisation) in accordance with the requirements
of the moulder and the part to be moulded. Not only has the moulder full flexibility in production, but new concepts in
engineering plastics have been made possible by DCPD RIM resins.

Properties
Engineering plastics with a wide range of applications must have a wide range of properties: DCPD is no exception to this rule.
DCPD polymers have an excellent combination of stiffness and impact strength, as well as having very low density.
They generally do not require any de-moulding agent and any glass fibre reinforcement. The range of application
temperatures is very wide: from -40 °C to over 110 ° C.
Resistance to acids and bases at all operating temperatures is extremely good. The high quality surface appearance gives
high quality painted parts, with simple surface preparation.
Painting is always required.
DCPD polymers have excellent electrical insulation properties.

Applications
For automotive and after market, sport and leisure and gardening equipment: DCPD meets the automotive challenge,
providing cost-reduction on the assembly line by part consolidation. A homogeneous "look" and quality surface
appearance (with the standard paint systems) is possible with good tools. DCPD parts are ready to paint and achieve a highquality
finish for the right image and sports look.
The use of plastics in the modern truck has meant progress in design, comfort and safety. For the future DCPD is the major
breakthrough: lightweight parts can be produced industrially without sacrificing mechanical properties.
For Agricultural and Earth moving equipment applications, image a material that doesn't rust or corrode, even in contact
with fertilizers, which doesn't break or split when it is bumped, banged and abused, that keeps it's appearance longer than
painted steel, even when it is left outside for years on end.
This material can be made into tractor fenders, parts for the tractor cab or engine hood and for earth moving equipment.
Anti-corrosion - Marine parts: Parts for the chlorine/caustic industry, such as the cell cover, made out of DCPD, are more
than an inert barrier over the electrical hardware. Low thermal conductivity, high electrical insulation, complete chemical
inertness to the reactants and products, DCPD is an integral part of the process.
General industry parts: Excellent toughness is required to resist all kinds of treatment and for a long life. For those custom
containers and pallets, where tooling cost is an important influence in the choice of the material, DCPD has the
competitive edge.

Main advantages
DCPD has the possibility to make complex parts modules and can compete advantageously with traditional high volume
materials and processes offering:
• Low part cost
• High perceived quality through the unique capability to produce monolithic structures
• Fine aesthetics
• Good part integrity and dimensional stability
• Weight savings
• Part design freedom in terms of variable thickness within the piece
• Part engineering freedom, by the possibility to use inserts in the mould
• Lower investments for machinery, tooling in comparison with other technologies (RRIM, SRIM, etc)

Cannon equipment for DCPD processing
Cannon have developed dedicated metering machines and moulding systems to process DCPD:
• High pressure metering units and mixing heads.
Conceived specifically for this application, these dosing
machines and heads perfectly suit the peculiar chemical and
physical characteristics of the DCPD process.