Polymerization method of anti-impact propylene copolymer having high melt flowability
A propylene copolymer and fluidity technology, which is applied in the field of producing impact propylene copolymer with high melt fluidity, can solve the problems of conflicting requirements of different catalysts, no consideration, and limitation of molecular structure control of impact copolymer polypropylene products.
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Embodiment 1
[0042] The main catalyst (titanium-containing solid catalyst active component) is prepared by the method described in Example 1 of Chinese Patent CN93102795, its Ti content: 2.4wt%, Mg content 18.0wt%, di-n-butyl phthalate content: 13wt %.
[0043] The polymerization reaction was carried out on a polypropylene pilot plant.
[0044] Pre-polymerization: After the main catalyst, co-catalyst (triethylaluminum), and the first external electron donor (methylcyclohexyldimethoxysilane) are pre-contacted at 10°C for 20 minutes, they are continuously added to the pre-polymerization reactor for pre-polymerization. Polymerization reactor, the flow of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow of methylcyclohexyldimethoxysilane (CHMMS) is 0.63g / hr, and the flow of main catalyst is 0.01g / hr hr. The pre-polymerization is carried out in the environment of the propylene liquid phase body, the temperature is 15°C, and the residence time is about 4 minu...
Embodiment 2
[0053] The catalyst used in embodiment 2, pre-complexation and polymerization process conditions are identical with embodiment 1. The difference from Example 1 is that the first external electron donor in Example 2 is diisobutyldimethoxysilane (DIBMS). The specific process conditions are shown in Table 1.
Embodiment 3
[0055] The catalyst used in embodiment 3, pre-complexation and polymerization process conditions are identical with embodiment 1. The difference from Example 1 is that the first external electron donor in Example 3 is tetraethoxysilane (TEOS). The specific process conditions are shown in Table 1.
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