Application of a kind of organosilane and polypropylene and preparation method thereof
An organosilane and polypropylene technology, applied in the field of modification of polyolefin resins, can solve the problems of gelation caused by branching, poor product processing performance, and low melt strength of polypropylene.
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[0018] The main improvement of the method for preparing polypropylene provided by the present invention is that before the propylene polymerization and / or during the olefin polymerization, the general structure of R is added to the polymerization reaction system 1 SiX m R 2 n The organosilane, and the type of catalyst and the way and conditions of propylene polymerization can be conventional choices in this field.
[0019] For example, the catalyst can be various existing substances that can be used to catalyze the polymerization of propylene monomers, and specific examples thereof include but are not limited to: at least one of Ziegler-Natta catalysts, metallocene catalysts and non-metallocene catalysts kind.
[0020] According to the present invention, the catalyst is preferably a Ziegler-Natta catalyst, and the Ziegler-Natta catalyst is preferably MgCl 2 supported catalyst system, the MgCl 2 The supported catalyst system contains MgCl 2 、TiCl 4 , aluminum alkyls and / ...
Embodiment 1
[0035] Under vacuum, add 500g of liquid propylene into the reactor, then sequentially add 0.1g of hydrogen, 0.54mol of triethylaluminum, 3g of allyltrichlorosilane and 10mg of composite catalyst, the reaction temperature is controlled at 70°C, and the polymerization The reaction time was 60 minutes. After the polymerization was completed, the gas in the reactor was emptied, the material was discharged, and vacuum-dried at 50° C. to obtain 325 g of homopolypropylene.
[0036] The melt strength, melt index and gel content of the homopolypropylene prepared above were tested, and the test results are shown in Table 1.
Embodiment 2
[0038] Under vacuum, add 500g of liquid propylene into the reactor, then add 0.1g of hydrogen, 0.54mol of triethylaluminum, 3g of allylmethyldichlorosilane and 10mg of composite catalyst in sequence. The reaction temperature is controlled at 70°C. The polymerization reaction time was 60 minutes. After the polymerization was completed, the gas in the reactor was vented, and the material was discharged, and vacuum-dried at 50° C. to obtain 320 g of homopolypropylene.
[0039] The melt strength, melt index and gel content of the homopolypropylene prepared above were tested, and the test results are shown in Table 1.
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