Polypropylene composition and preparation method thereof
A polypropylene composition and polymer technology, applied in the field of polypropylene composition, can solve the problem of not being able to improve the scratch resistance and stress whitening resistance of polypropylene products at the same time, and achieve good stress whitening resistance, The effect of simple preparation process and high scratch resistance
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preparation example Construction
[0053] In a preferred embodiment, the preparation method of the polypropylene composition comprises: first preparing the polymer composition, and then preparing the polypropylene resin, the prepared polymer composition, the scratch-resistant masterbatch, and optionally the polypropylene Melt blending of ethylene, mineral fillers, tougheners, antioxidants and other processing aids.
[0054] Specifically, the preparation method of the polypropylene composition comprises the following steps:
[0055] (1) Under the first olefin polymerization conditions, the first monomer a is contacted with a Ziegler-Natta catalyst with high stereoselectivity, and the unreacted monomer is removed from the mixture obtained after the contact reaction to obtain A first mixture of crystalline polypropylene A, wherein said first monomer a contains propylene and optionally ethylene and / or an alpha-olefin having 4 to 10 carbon atoms;
[0056] (2) Under the conditions of gas-phase polymerization of olef...
preparation example
[0109] Preparation Example: Preparation of Polymer Composition
[0110] The polymer compositions in the following preparation examples and reference preparation examples were obtained according to the following methods, wherein the amount of materials used and the polymerization reaction conditions are listed in Table 1.
[0111] The polymerization reaction is carried out on a set of horizontal gas-phase polypropylene pilot plant. The polymerization reactor is two horizontal stirring reactors connected in series. The polymerization method and steps are as follows:
[0112] The main catalyst (solid catalyst component) is obtained by the method described in Example 1 of CN102453150A, wherein the internal electron donor compound is di-n-butyl phthalate.
[0113] The main catalyst, co-catalyst (triethylaluminum) and external electron donor are continuously added to the horizontal stirring reactor under the carrying of propylene to carry out the polymerization reaction. The cataly...
preparation example 2
[0122] Using the catalyst used in Reference Preparation 1, the polymer composition was prepared according to the above method, except that the polymerization temperature in the first reactor was 85° C., the amount of hydrogen added was changed, and the composition and content of component (b) were changed. The reaction conditions and product properties are shown in Table 1. The product was granulated with additives to make an injection molding sample DP2 of the polymer composition, and its test properties are shown in Table 2.
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