Thermoplastic resin composition and its application in medium voltage AC cable insulation layer
A composition and polymerization reaction technology, applied in the field of thermoplastic resin, can solve the problems of poor dielectric properties of cable insulation layer, etc., achieve the effects of reducing degradation and aging, reducing the size of lamellae, and prolonging the service life
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[0038] According to the present invention, in the present invention, the polymerization reaction can be carried out in a conventional gas phase apparatus for polypropylene, such as an Amoco gas phase polymerization apparatus. Specifically, according to the present invention, a preferred embodiment for preparing a polypropylene heterophasic copolymer includes the following: Describe the steps:
[0039] (1) in the first polymerization reactor, the main catalyst (MgCl 2 / TiCl 4 / DIBP), triethylaluminum, methylcyclohexyldimethoxysilane, liquid propylene and / or ethylene, hydrogen contact to carry out the first polymerization reaction;
[0040] (2) the particles obtained after the step (1) are entered into the air lock, after the hydrogen and propylene gas are evacuated, the material enters the second polymerization reactor, and propylene, ethylene and / or -alpha olefin are introduced to carry out the second polymerization reaction ;
[0041] (3) regulating the load ratio of the f...
preparation example 1
[0067] This preparation example is to illustrate the polypropylene heterophasic copolymer prepared by the present invention.
[0068] (1) The main catalyst (MgCl 2 / TiCl 4 / DIBP), triethylaluminum, methylcyclohexyldimethoxysilane, liquid propylene and ethylene (the mass ratio of ethylene to propylene is 1:50) and hydrogen (the ratio of hydrogen to propylene is 20‰) was added to the first In a polymerization reaction kettle, after propylene gasification, the heat of reaction in the reaction kettle is removed; wherein, the first polymerization reaction temperature is 65 ° C, the polymerization pressure is 2.4 MPa, and the material residence time in the reaction kettle is 1.0 hour;
[0069] (2) after the reaction, the particles obtained in step (1) are entered into the air lock, and after the hydrogen and propylene gas are evacuated, the material enters the second polymerization reactor, and a certain proportion of propylene and ethylene are introduced to carry out the second po...
preparation example 2
[0074] This preparation example is to illustrate the polypropylene heterophasic copolymer prepared by the present invention.
[0075]The polypropylene heterophasic copolymer was prepared according to the same preparation method as in Preparation Example 1, except that in step (2), alpha olefin (butene) was also added, and by controlling the amount of propylene, ethylene and alpha olefin And the second polymerization reaction conditions (specifically, the second polymerization reaction temperature is 65 ° C, the polymerization pressure is 2.5MPa, and the polymerization time is 1 hour), so that the total content of ethylene structural units in the final obtained polypropylene heterophasic copolymer is 11.6% by weight, the total content of propylene structural units is 86.5% by weight, the total content of α-olefin structural units is 1.5% by weight; and the ethylene content in the ternary random copolymer is 42.6% by weight, and the relative content of the rubber phase is 25% by ...
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Abstract
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