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Propylene polymer, preparation method and applications thereof
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A kind of propylene polymer and polymer technology, which is applied in the production of single-component polypropylene rayon, single-component polyolefin rayon, and bulk chemicals, and can solve problems such as the difficulty in designing and synthesizing ligand steric catalysts
Inactive Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, too low temperature is not suitable for existing industrial reaction devices, and the excessive ligand steric hindrance makes the design and synthesis of catalysts more difficult.
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Embodiment 1
[0103] (1) Preparation of Ligand 1: 4.42g (8mmol) of ɑ-diimine compound 3, add 50ml tetrahydrofuran and lithium aluminum tetrahydrohydride (16mmol) in sequence, and stir at 60°C for 6 hours. After cooling, use hydroxide Aqueous sodium solution was used to terminate the reaction, and the organic phase was extracted with ethyl acetate, dried, filtered, and recrystallized to obtain ligand 3 as colorless crystals with a yield of 63%;
[0105] (2) Preparation of complex 3: 10ml (DME) NiBr 2 (277mg, 0.9mmol) in dichloromethane solution was added dropwise to 10ml of Ligand 3 (501mg, 0.9mmol) in dichloromethane solution, stirred at room temperature for 6 hours, a precipitate precipitated, filtered, washed with ether, and dried to obtain a red powdersolid. Productive rate is 80%; Elemental analysis (C 40 h 48 Br 2 N 2 Ni): C, 61.97; H, 6.24; N, 3....
Embodiment 2
[0108] Step (1), (2) are with embodiment 1;
[0109] (3) Propylene polymerization: In a 48-channel parallel pressure reactor (PPR, reaction volume 20ml), add 15.6mg (20μmol) complex 3, propylene displacement reactor, add 5ml methyl aluminoxane (MAO), Fill with propylene gas, control the pressure at 1Mpa, and react at 40°C for 1 hour; discharge the material, neutralize it with 5% hydrochloric acid acidified ethanol solution, dry it to obtain polypropylene, and calculate the catalyst activity; simultaneously measure the polymer weight average molecular weight Mw and Molecular weight distribution Mw / Mn, the results are shown in Table 1.
Embodiment 3
[0111] Step (1), (2) are with embodiment 1;
[0112] (3) Propylene polymerization: In a 48-channel parallel pressure reactor (PPR, reaction volume 20ml), add 15.6mg (20μmol) complex 3, propylene displacement reactor, add 5ml methyl aluminoxane (MAO), Fill with propylene gas, control the pressure at 1Mpa, react at 60°C for 1 hour; discharge the material, neutralize it with 5% hydrochloric acid acidified ethanol solution, dry it to obtain polypropylene, and calculate the catalyst activity; simultaneously measure the polymer weight average molecular weight Mw and Molecular weight distribution Mw / Mn, the results are shown in Table 1.
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Abstract
The invention discloses a propylene polymer, which has no melting point through a DSC test, is a random propylene polymer, and has the weight-average molecular weight of 5000-100000 and the molecularweight distribution of 1.0-3.0, preferably 1.6-2.0. The invention also discloses a preparation method of the propylene polymer, wherein the method comprises: making propylene contact a catalyst underthe condition of an olefin polymerization reaction, wherein the catalyst comprises a main catalyst and a cocatalyst, and the main catalyst is selected from a metal coordination compound represented bya formula I. According to the present invention, propylene polymerization can be catalyzed at high activity at a high temperature to prepare completely random polypropylene, and the molecular weightof the obtained polymer can be regulated and controlled within a certain range by regulating the structure of the coordination compound.
Description
technical field [0001] The invention relates to a propylene polymer and a preparation method thereof, in particular to a random propylene polymer without melting point, a preparation method and an application thereof, belonging to the field of propylene polymers. Background technique [0002] my country is the country with the fastest growing consumption of synthetic resin and the largest importer of synthetic resin. At present, the proportion of polyolefin production is nearly 60%. Compared with other resin materials, olefin resin has excellent environmental coordination. Materials used in the industry for key promotions. Polypropylene is one of the synthetic resins with the fastest development, the largest output and a wide range of uses, reaching 70 million tons in 2017. Atactic polypropylene has the characteristics of good solubility, moisture resistance and chemical resistance; it can be used as coating and adhesive components, main agent of blends, special material pre...
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