Formulating the right Polyurethane elastomers
that can resist to extreme environmental conditions
such as high and low temperatures, humidity, stain and chemical aggressions while ensuring durable high performance
is a challenge.
Polycarbonate Diols (PCD) offer customizable possibilities
with superior and long-term retention of designed performances, without modification of initial properties
after being exposed in harsh environments.
The outstanding durability of Polyurethane elastomers based on PCS
is obtained thanks to different performances, such as:
Access more information about the best-in-class performances of Polycarbonate Diol-based Polyurethane elastomers, click on the pictures below:
Excellent water resistance of Polyurethane elastomers
Polycarbonate Diols (PCD) allow formulators to provide extremely durable Polyurethane elastomers
thanks to increased resistance to water / hydrolysis.
shows that water absorption is less important
(-52%) for Polyurethane elastomers
based on PCD.
This leads to minor weight increment and better resistance to hydrolysis
than Polyurethane based on benchmark Diols.
Water absorption of Diol-based PU
Therefore, Polyurethane elastomers
formulated with Eternacoll®
withstand extreme humid conditions
and remain intact after long-term exposure to water and humidity.
Increased chemical & stain resistance of Polyurethane elastomers
Exposure to harsh solvents and fluids tends to damage materials over time, causing them to fade, discolor and get stained.
(PCD) can help you to overcome this annoying constraint by enhancing the chemical and stain resistance
of your Polyurethane elastomers.
An ethanol resistance test was run in order to compare the chemical resistance of Diol-based Polyurethanes (see picture 1)
As illustrated on Figure 2,
Polyurethane formulated with Eternacoll® PCD shows an improved resistance to harsh solvents compared to Polyurethane based on benchmark Diols.
Picture 1: Ethanol resistance test of
PCD-based PU materials
Determination of resistance to liquids
Part 1: Immersion in liquids other than water
Figure 2: Ethanol resistance of Diol-based PU
*5 = Intact material after exposure
4 = Slight change in gloss or color
3 = Light mark
2 = Strong mark
1 = Material removal
The use of Eternacoll® PCD in your Polyurethane formulations allows you to provide highly durable Polyurethane elastomers
that can better resist to exposure of chemicals.
This makes Eternacoll® PCD suitable for applications in which Polyurethane elastomers
have to resist to very harsh environmental conditions,
such as oil & mining pipes inner cast.
Last but not least, Polycarbonate Diols
also have the advantage of providing an outstanding stain resistance
to Polyurethane-based materials.
Stain resistance of Diol-based PU materials
High thermal stability of Polyurethane elastomers
If temperature resistance
is a must-have
for your Polyurethane elastomers
and if you can’t afford to provide Polyurethane that tends to yellowish over time, then PCD is the technology you have always been looking for!
provide a very high thermal stability to Polyurethane elastomers
compared to traditional Polyester and Polyether Diols, thanks to excellent heat resistance.
illustrates that Eternacoll® PCD has a very low increment of yellowness index
after artificial weathering compared to standard Polyether and Polyester Diols.
Figure 4 and Picture 3
Increment of yellowness index of Diols-based PU
ISO 3248:1998 - Measurements after 15 days at 120° C
illustrate the excellent retention of initial Polyurethane properties of Eternacoll® based Polyurethane
after heat ageing, for an improved durability of your elastomers!
Retention* of hardness Persoz
ISO 1522:2007 - Pendulum damping test
*Retention = (property after ageing)/(initial property) x 100
Polyadipate of 1,6-hexanediol
|Picture 3: Pictures of Diol-based PU materials after heat exposition
Therefore, Eternacoll® PCD allow to provide highly durable Polyurethane elastomers
that resist to heat and can be used for applications exposed to high temperatures.
Improved mechanical properties of Polyurethane elastomers
Formulating Polyurethane with Polycarbonate Diols (PCD) maximizes the performance of elastomer formulations.
Polyurethane based on Eternacoll® PCD
shows better mechanical properties
compared to Polyurethane based on traditional Diols:
- The Polyurethane elastomer has a better tensile strength (+329%) and is therefore less elastic (Figure 5)
- It also shows a better hardness (+173%), as illustrated on Figure 6
Figure 5: Tensile strength of Diol-based PU
Figure 6: Hardness of Diol-based PU
The improvement of mechanical properties allows you to provide a Polyurethane which is less elastic and shows a better hardness, for highly durable materials!
Increased scratch & abrasion resistance of Polyurethane elastomers
formulated with Polycarbonate Diols
show increased abrasion and scratch resistance, and are therefore more durable
than the ones formulated with standard Diols.
Figure 7 shows that Polyurethane based on Eternacoll® Polycarbonate Diols
loses less volume when exposed to harsh conditions
than Polyurethane based on traditional Diols, and has therefore a better resistance to abrasion:
Abrasion resistance (Volume Loss of material) of
Diol-based PU when exposed to harsh conditions
of PCD-based Polyurethane has been tested thanks to the determination of film hardness
with pencil test.
illustrates that Polyurethane elastomers
based on Eternacoll® PCD have a higher hardness
and therefore an increased scratch resistance
than benchmark Diols.
Conditions of Pencil test - Determination of film hardness
The use of Polycarbonate Diols such as Eternacoll® allows to develop extremely durable Polyurethane elastomers
that can resist to intense environmental conditions.