Measuring the changes in resins’
dynamic viscosity over a range
of temperatures from 70 to 105°C
and comparing them.
Set the sample contained in cup C at a
temperature of 70°C for 10 minutes in
the RT-1 oven;
The measurement consists of increasing
the temperature of the RT-1 oven from 70°C
to 105°C, and measuring viscosity based
on times of 10 minutes, using the software
which leads the RM 100 PLUS viscometer
at a shear rate of 50 s-1.
The resulting curveshows changes in
kinetics viscosity based on temperature.
Comparing several products by superimposing
the curveswill show the ability of the products
to withstand significant changes in temperature
in terms of their viscosity.
Resin A is sensitive to changes in temperature: it is very fluid at high temperatures >95°C, but becomes very viscous
when it cools down, passing from 200 mPa.s at 95°C to 2000 mPa.s at 78°C. Resin B however, responds completely
differently, with a relatively stable viscosity, in this temperature range, of around 700 mPa.s.
Depending on the usage temperature of these resins, their viscosity could be completely inverted:
A is much more viscous than B up to 85°C, and B become more viscous than A upwards of 95°C.
For both resins to be used in a risk-free way, they must be worked with at 90°C.