Polypropylene composition, polypropylene material and preparation method and application thereof
A polypropylene composition and polypropylene technology, applied in the field of polyolefin materials, can solve problems such as the inability to store high-temperature liquids above 100°C, and achieve good chemical corrosion resistance
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[0023] In the present invention, in order to further improve the heat resistance and other comprehensive properties of the obtained polypropylene material, according to a preferred embodiment of the present invention, the homopolymerized polypropylene includes a first homopolymerized polypropylene and a second homopolymerized polypropylene Propylene, the first homopolypropylene and the second homopolypropylene have a melt index of (0.05-0.4) g / 10min (more preferably (0.1-0.3) measured at 230° C. and a load of 2.16 kg g / 10min), and the first homopolypropylene and the second homopolypropylene satisfy at least one of the following conditions:
[0024] (a) The difference between the melt indices of the first homopolypropylene and the second homopolypropylene measured at 230° C. and a load of 2.16 kg is MI 1 -MI 2 , and 0.1g / 10min≤MI 1 -MI 2 ≤0.3g / 10min (more preferably 0.1g / 10min≤MI 1 -MI 2 ≤0.2g / 10min);
[0025] (b) The difference between the densities of the first homopoly...
preparation example
[0061] In the following examples, in order to facilitate adjustment to obtain desired homopolypropylene and random copolymerized polypropylene with different parameters, the used homopolypropylene and random copolymerized polypropylene are both prepared, and the specific preparation process and parameters are carried out according to conventional methods in the art, including the following operations:
[0062] (1) Preparation method of homopolypropylene
[0063] Propylene and hydrogen (both of polymer grade, used after removing water and oxygen) were added to the reactor, and the catalyst system was added, and then the polymerization was carried out in the reactor at about 66° C. and 2.2 MPa. The polymer powder obtained by the polymerization reaction is subjected to monomer separation, enters the degassing bin to remove the residual catalyst, and is transported to the extrusion granulation system for granulation. In the preparation process, the control of the melt index is re...
Embodiment 1
[0067] Step 1: Prepare the polyolefin composition with the following components and contents:
[0068] (1) Homopolypropylene: a total of 69.8 parts by weight, including:
[0069] The first homopolypropylene: 40 parts by weight; the melt index is 0.3g / 10min, the density is 0.904g / 10min, and the melting temperature is 164°C;
[0070] The second homopolypropylene: 29.8 parts by weight; the melt index is 0.15g / 10min, the density is 0.902g / 10min, and the melting temperature is 162°C;
[0071] (2) random copolymerized polypropylene: 16 parts by weight; the melt index is 0.3g / 10min, the density is 0.897g / 10min, the melting temperature is 144°C, and the content of the ethylene structural unit is 5% by weight;
[0072] (3) Chopped alkali-free glass fiber: 12 parts by weight; Taishan glass fiber, T438H; fiber length is 4.5 mm, fiber diameter is 13 μm, and the following are the same;
[0073] (4) Compatibilizer: 1.5 parts by weight; polypropylene grafted maleic anhydride, Shanghai Yuanyu...
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Abstract
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