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NOVEL SILICA-DIPPED POLYMERIZATION CATALYST FOR POLYOLEFINS HAVING WIDE DISTRIBUTION OF MOLECULAR WEIGHT, AND ITS PREPARATION METHOD BY DIPPING MAGNESIUM DIHALIDE, ALKYL ALUMINOXANE AND TITANIUM COMPOUND INTO SURFACE-MODIFIED SILICA IN TURN
NOVEL SILICA-DIPPED POLYMERIZATION CATALYST FOR POLYOLEFINS HAVING WIDE DISTRIBUTION OF MOLECULAR WEIGHT, AND ITS PREPARATION METHOD BY DIPPING MAGNESIUM DIHALIDE, ALKYL ALUMINOXANE AND TITANIUM COMPOUND INTO SURFACE-MODIFIED SILICA IN TURN
PURPOSE: Provided are a novel silica-dipped polymerization catalyst for polyolefins having a wide distribution of molecular weight which is excellent in activity, and its preparation method. CONSTITUTION: The method comprises the steps of modifying the surface of silica to prepare a modified silica having a modified surface; dipping magnesium dihalide into the modified silica; dipping an alkyl aluminoxane into the obtained silica; and dipping a titanium compound into the obtained silica. Preferably the dipping content of the magnesium dihalide is 1.0-5.0 mmol/g, the dipping content of the alkyl aluminoxane is 1.0-100 Al/Mg mol and the dipping content of the titanium compound is 0.1-2.0 mmol/g or 1.0-50 Al/Ti mol, based on the amount of the silica. Preferably the alkyl aluminoxane is represented by the formula 1 or 2, and is at least one compound which is soluble in an aromatic hydrocarbon and is hardly soluble in an aliphatic hydrocarbon, wherein R is a C1-C8 alkyl group; and n is an integer of 1-100. Preferably the titanium compound is selected from a compound represented by (RO)nTiX(4-n), wherein R is a C1-C20 hydrocarbon group; X is Cl, Br, I or a pseudo-halide; and n is an integer of 0-4.
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机译：用途：提供了一种新型的二氧化硅浸渍的聚合催化剂，该催化剂具有宽的分子量分布，具有优异的活性，及其制备方法。组成：该方法包括以下步骤：改性二氧化硅的表面，以制备具有改性表面的改性二氧化硅。将二卤化镁浸入改性二氧化硅中;将烷基铝氧烷浸入所得二氧化硅中;将钛化合物浸入所得二氧化硅中。优选地，二卤化镁的浸渍含量为1.0-5.0mmol / g，烷基铝氧烷的浸渍含量为1.0-100Al / Mg mol，钛化合物的浸渍含量为0.1-2.0mmol / g或1.0-50。 Al / Ti mol，基于二氧化硅的量。优选地，烷基铝氧烷由式1或2表示，并且是至少一种可溶于芳族烃并且几乎不溶于脂族烃的化合物，其中R是C1-C8烷基; n是1到100的整数。优选地，钛化合物选自由（RO）nTiX（4-n）表示的化合物，其中R是C1-C20烃基; X为Cl，Br，I或拟卤化物; n是0-4的整数。
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