LANXESS, a specialty chemicals company, has recently launched a new
system, Adiprene LFM C525 cured with Vibracure 2101, developed for the most
challenging wheel applications. This MDI polycaprolactone-based prepolymer
offers excellent performance and great dynamics such as high tear strength,
outstanding fatigue and abrasion resistance.
In order to demonstrate the performance and reliability of this
differentiated system to the market, LANXESS undertook testing comparing the
material with the highest industry standard utilised in polyurethane wheels.
Adiprene Low Free (LF) MDI C525 is a polycaprolactone-based prepolymer
with a level of free MDI less than one per cent. When cured with Vibracure
2101, the system delivers a 96 shore A material. Lower hardness elastomers are
also possible with variants of Vibracure 2101. Tests were carried out at
different loads, speeds and wheel geometries and followed ISO industry
standards. In conclusion, the system has proven to perform as good as the
highest performance industry standard, delivering great dynamics but also a
lower rolling resistance allowing energy savings. In addition to the excellent
performance, Adiprene LFM C525 prepolymer is easy to process, requiring on
average 16-24 hours at 115-120 °C post cure time, and it is stable at room
temperature for ca. 36 month.
This PU system is a unique solution, whereby the LF isocyanate
technology facilitates the use of this differentiated curative. The LF
technology avoids the starring effect which creates star shaped crystals within
the elastomer due to curative precipitation. Along with easier handling and
excellent performance, the LF technology also brings unsurpassed health and safety
conditions to the processor.
Understanding the complexity of different wheel applications, LANXESS
has developed other LF MDI polycaprolactone systems based on different curative
combination allowing to reach hardness from 88 to 96 Shore A. Through many
years of technical experience related to PU formulations specific to wheel
applications, LANXESS has developed a predictive wheel model tool, that will
predict with good accuracy the wheel performance within the final application.
Therefore LANXESS can support its customers in evaluating Adiprene LFM C525 in
different wheel designs and/or different load/speed conditions.