Preparation method of transparent high melt strength polypropylene resin
A transparent polypropylene and resin technology, applied in the field of transparent polypropylene resin manufacturing, can solve the problems of small molecule odor, high manufacturing cost, high cost of advanced olefins, etc.
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Embodiment 1
[0042] Embodiment 1. batch method prepares transparent polypropylene resin
[0043] The Z-N catalyst is N type, and the Ti content is calculated as 2.0%. Co-catalyst: Triethylaluminum AT, prepared with hexane before use to a safe concentration of 0.88mol / L; electron donor: dicyclopentyldimethoxysilane, diluted to 110mmol / L hexane solution before use . Accurately weigh 60.0 mg of the Z-N N-type catalyst, add 3.0 ml of triethylaluminum solution and 1.5 ml of dicyclopentyldimethoxysilane solution into the catalyst feeder under nitrogen protection. Add 2500g of propylene into the autoclave, feed ethylene at a rate of 25g / hour, rapidly raise the temperature, control the temperature at 65±1°C for bulk polymerization, and stir at 200 rpm. When the polymerization takes 60 minutes, take the copolymerization A small amount of polymer sample was dried to analyze the intrinsic viscosity of the polymer, as shown in Table 1. 10L of hydrogen and 1.22L of ethylene were introduced, and the p...
Embodiment 2
[0044] Embodiment 2. Batch method prepares transparent polypropylene resin
[0045] The catalyst system was the same as that in Example 1. 60.0 mg of N-type catalyst was accurately weighed, 3.0 ml of triethylaluminum solution, and 2.0 ml of dicyclopentyldimethoxysilane solution were added to the catalyst feeder under nitrogen protection. Add 2500g of propylene into the autoclave, heat up rapidly, feed ethylene at a rate of 25g / hour, control the temperature at 65±1°C for bulk polymerization, and stir at a speed of 200 rpm. When the polymerization takes 60 minutes, take the copolymerization A small amount of the material sample was dried and tested for intrinsic viscosity analysis of the polymer, see Table 1, 30L of hydrogen was introduced, and the polymerization temperature of 1.62L of ethylene was controlled at 75±5°C. The gas composition in the polymerization kettle was detected by online gas chromatography. The material was discharged through the feed valve in 1 minute, drie...
Embodiment 3
[0048] Embodiment 3. continuous production produces transparent polypropylene resin
[0049] The catalyst system is the same as in Example 1, the N-type catalyst is 1.0g / hour, and triethylaluminum and dicyclopentyldimethoxysilane are added with a metering pump at a ratio of Al / Si / Ti of 100mol / 10mol / 1mol Add D-201 kettle, the polymerization temperature is controlled at 68±1°C for bulk polymerization, and ethylene is introduced, and the ethylene gas phase concentration is controlled at 1-2% (mass), the stirring speed is 200 rpm, and the average residence time is 15 After taking out a small amount of polypropylene from the sampling port and drying it, carry out the intrinsic viscosity analysis test of the polymer, see Table 2, the D-202 kettle polymerization temperature is controlled at 63 ± 1 ° C, and the ethylene gas phase concentration is controlled at 1-2% (mass), The average residence time is controlled at 30 minutes, and a small amount of polypropylene is taken out from the...
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