Soft polypropylene and preparation method thereof
A technology of soft polypropylene and propylene, applied in the field of soft polypropylene and its preparation, can solve the problems of poor high temperature resistance, low heat distortion temperature and softening temperature, etc., and achieve the effect of easy operation and implementation
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Embodiment 1
[0041] In this example, the specific surface area is 377.2m 2 / g, a Zigler-Natta catalyst with a pore size of 5.413 nm and an ethylene incorporation rate of up to 98 wt%.
[0042] Pre-complexation: solid catalyst, triethylaluminum (TEA), and external electron donor tetraethoxysilane (Donor) were pre-complexed at 10° C. for 20 min. The flow rate of triethylaluminum entering the precomplex was 6.33 g / hr, the flow rate of tetraethoxysilane was 2.11 g / hr, and the flow rate of the main catalyst was 0.01 g / hr. Among them, the TEA / Donor mass ratio is 3.
[0043] Pre-polymerization: The pre-complexed catalyst system is continuously added to the pre-polymerization reactor for pre-polymerization. The pre-polymerization is carried out in the bulk environment of propylene liquid phase, the temperature is 15 °C, and the residence time is 4 min. Under this condition, the pre-polymerization of the catalyst is carried out. The multiple is 120-150 times.
[0044] The prepolymerized slurry e...
Embodiment 2
[0050] The process of Example 2 is similar to that of Example 1, and only the addition amount of the components in each polymerization section is different. Specifically, in the pre-complexation stage, the mass ratio of triethylaluminum to the external electron donor tetraethoxysilane is 2.5 .
[0051] In the first loop reactor, the reaction temperature was 72° C., the reaction pressure was 4200 KPa, the ethylene / (ethylene+propylene) molar ratio was 0.060, and the hydrogen concentration was 1500 ppm.
[0052] In the second loop reactor, the reaction temperature was 70° C., the reaction pressure was 4100 KPa, the ethylene / (ethylene+propylene) molar ratio was 0.057, and the hydrogen concentration was 700 ppm.
[0053] In the third gas phase reactor, the reaction temperature was 85°C and the ethylene / (ethylene+propylene) molar ratio was 0.351.
[0054] 600ppm of the main antioxidant 1010, 1200ppm of the auxiliary antioxidant 168, and 500ppm of the acid absorbing agent calcium st...
Embodiment 3
[0057] The process of Example 3 is similar to that of Example 1, and only the addition amount of the components in each polymerization section is different. Specifically, in the pre-complexation stage, the mass ratio of triethylaluminum to the external electron donor tetraethoxysilane is 6. .
[0058] In the first loop reactor, the hydrogen concentration was 2500 ppm, and other reaction conditions were the same as those of the first loop reactor in Example 1.
[0059] In the second loop reactor, the reaction temperature was 70° C., the reaction pressure was 4200 KPa, the ethylene / (ethylene+propylene) molar ratio was 0.055, and the hydrogen concentration was 1000 ppm.
[0060] In the third gas phase reactor, the reaction temperature was 82° C., the reaction pressure was 1300 KPa, and the ethylene / (ethylene+propylene) molar ratio was 0.330.
[0061] Other process conditions and additive amount are consistent with Example 1, and the specific process conditions and performance te...
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