AKRON—Akrochem's Mansil 175G high dispersing silica is a medium surface area reinforcing filler for use in synthetic and natural rubber compounding.
The silica, which comes in low-dusting granules, reduces irritating dust for applications where powdery material can not be tolerated, according to an Akrochem release.
It has faster incorporation time and less viscosity buildup while maintaining dispersion, said Akrochem. Appearing as white granules, its moisture loss percentage at 105° C under two hours in the oven is 5 +/-2. It pH in a 5 percent slurry is 5.5-7.5, and has a BET surface area of 170-190 grams per meter squared, Akrochem said.
Mansil 175G can be used for mechanical rubber goods as the primary filler or in combination with carbon black. Akrochem said the silicas improve rolling resistance, flex fatigue and enhance traction in tire applications.
In adhesives compounding, silica provides an additional method of promoting improved adhesion and provides reinforcement. Silicas are applied for increased abrasion resistance, green strength and translucence in the formulating of shoe sole compounds.
For dosage, lightly loaded compounds are prepared using 5-20 parts per hundred rubber, while highly loaded, oil-extended compounds can use 75-100 phr. Akrochem said polyethylene glycol 3350 is the most commonly used activator to improve cure rate and state of cure. Akrosorb 29471, a dry liquid dispersion of 72 percent diethylene glycol, functions like PEG-3350 with further reduction of compound viscosity.
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