On the 20×104 t/a Unipol gas-phase polypropylene production unit of a Petrochemical Company,a scratch resistant and high stiffness BOPP special material L5D98N was developed through process parameter adjustment and catalyst formulation optimi-zation.The results showed that the main catalyst CS-1-G was combined with the external electron donor UD55,and a composite an-tioxidant XT500 and acid remover DHT4A were selected.Under certain process conditions,a scratch resistant and high stiffness BOPP special material suitable for downstream processing was produced.
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