| 配方类型： |
MISCELLANEOUS |
| 配方说明： |
Eraser (Pencil) |
| 配方组成： |
Titanium Dioxide/10
Lithopone/100
Fina Process Oil 2059/30
White Factice 822/100
Zinc Oxide/10
Vulcanizate Properties: Cure: 30 min at 150 C in stea
Density (mg/m^3)/1.67
Hardness, IRHD/40
Stearic Acid/2
Barytes/80
Mill mixing is often preferred because of the greater control it allows.
High factice levels can also cause occasional crumbling in internal
Sulfur/8
mixers unless care is taken. Mill rolls should be kept cool since high
MBTS/1
temperature may result in sticking. The following mix schedule has been
found satisfactory:
DPG/2
Disperse the zinc oxide in the rubber. Add stearic acid, accelerators,
sulfur, pigment, filler, and oil. Add the factice.
Pigment/as required
Erasers are generally either cured from calendered or milled sheet in
simple clamped molds in a steam pan or are extruded and then steam
cured. Press molding is also used. Molded erasers may be either
individually molded |
|
