Seeking advice on composite additives issues in polyethylene granulation using different catalysts
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As far as I know, polyethylene produced using titanium-based catalysts always has antioxidants (1010/1076+168) and acid scavengers (calcium/zinc stearate, DHT-4A, etc.) added during granulation. The role of these acid scavengers is mainly to absorb any residual chlorine from the catalyst. So the question is: in the case of chromium-based catalysts, is it not necessary to add acid scavengers during granulation? Is it sufficient to add just some antioxidants, or are other substances needed as well?
Are chromium-based catalysts being used currently?
Polyethylene products using chromium-based catalysts are mainly used for pipes and as granulation additives, similar to those using titanium-based catalysts.
Acid absorbents – this term is rarely used, I think. Zinc stearate and calcium stearate are also added during the granulation of chromium-based catalyst products
Stearates also act as lubricants