ISO 2302:2005 pdf download.lsobutene-isoprene rubber (lIR)一Evaluation procedures.5.2.2.3 Method B — Mixing with a miniature internal mixer (MIM)
For a miniature internal mixer having a nominal mixing capacity of 64 cm3, a batch mass corresponding to 0,47 times the formulation mass (i.e. 0,47 x 156,75 = 73,67 g) has been found to be suitable.
Mix with the head temperature of the miniature internal mixer maintained at 60 °C ± 3 C and a starting (unloaded) rotor speed of 6.3 rad/s to 6,6 rad/s (60 rpm to 63 rpm).
Prepare the rubber by passing it once through a laboratory mill with the roll temperature set at 50 C ± 5 C and an opening of 0,5 mm. Cut the sheet thus produced into strips 25 mm wide.
In the following procedure, compounding materials other than rubber, e.g. carbon black, may be added to the batch more precisely and with greater ease if they are previously blended together in the proporhons required by the formulation. Such blends may be made using one of the following:
— a mortar and pestle;
a double-cone mixer (mix for 10 mm with the intensifier bar turning):
— a blender (mix for five periods of 3 s each, scraping the inside of the blender to dislodge material stuck to the sides after each 3 s period) (a Waring”-type blender has been found suitable for this method).
CAUTION — If the mixing periods are longer than 3 s, the stearic acid may melt, thus preventing good dispersion.
Mix with the head temperature of the miniature internal mixer maintained at 60 °C ± 3 C and a starting (unloaded) rotor speed of 6.3 rad/s to 6,6 rad/s (60 rpm to 63 rpm).
Prepare the rubber by passing it once through a laboratory mill with the roll temperature set at 50 C ± 5 C and an opening of 0,5 mm. Cut the sheet thus produced into strips 25 mm wide.
In the following procedure, compounding materials other than rubber, e.g. carbon black, may be added to the batch more precisely and with greater ease if they are previously blended together in the proporhons required by the formulation. Such blends may be made using one of the following:
— a mortar and pestle;
a double-cone mixer (mix for 10 mm with the intensifier bar turning):
— a blender (mix for five periods of 3 s each, scraping the inside of the blender to dislodge material stuck to the sides after each 3 s period) (a Waring”-type blender has been found suitable for this method).
CAUTION — If the mixing periods are longer than 3 s, the stearic acid may melt, thus preventing good dispersion.
