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A kind of polypropylene product and preparation method thereof

A polypropylene and product technology, applied in the field of polypropylene products and their preparation, can solve the problems of polymer molecular weight drop, brittleness, catalyst activity reduction, etc., and achieve good stereospecificity, high hydrogen sensitivity, and high polymerization activity Effect

Active Publication Date: 2016-12-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the currently produced high melt flow rate polypropylene uses chemical degradation to increase the melt flow rate of the product, but the polypropylene products prepared by this method are prone to yellowing, brittleness, odor, and cost increase
And because the performance of different batches of raw materials cannot be guaranteed, resulting in unstable products
[0004] By adding a large amount of hydrogen into the polymerization reactor, the melt flow rate of the polymerization product can be increased, but at the same time, the isotactic index of the polymer is also reduced, which may cause the polymer to become viscous and cause normal production.
Moreover, due to the use of a large amount of hydrogen, the pressure resistance requirements of the reactor are increased, and the amount of hydrogen recovery in the production process is also increased.
[0005] US6686433B1 discloses a catalyst with high hydrogen tuning sensitivity. Although the method can improve the melt mass flow index of the polymer by using tetraethyl orthosilicate (TEOS), after adding tetraethyl orthosilicate (TEOS) , causing the catalyst activity to be greatly reduced, and the molecular weight of the obtained polymer is reduced, and the isotactic index of the polymer is also relatively low

Method used

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  • A kind of polypropylene product and preparation method thereof
  • A kind of polypropylene product and preparation method thereof
  • A kind of polypropylene product and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] According to the preparation method of polypropylene product of the present invention, the method comprises polymerizing propylene or a mixture of propylene and ethylene and / or α-olefin in the presence of a catalyst under olefin polymerization conditions to obtain a polypropylene product, the catalyst Contains a solid component, an alkylaluminum compound and an external electron donor compound, the solid component contains magnesium, titanium, halogen and an internal electron donor compound, the internal electron donor compound contains a 1,3-diether compound , wherein, the solid component is prepared by the following method:

[0022] (1) reacting the magnesium-containing support with the first titanium compound, and adding an internal electron donor during one or more time periods before, during and after the reaction of the magnesium-containing support with the first titanium compound;

[0023] (2) The product obtained in step (1) is subjected to solid-liquid separati...

Embodiment approach

[0031] In the present invention, the magnesium-containing carrier can be various magnesium-containing solid substances commonly used in the field of olefin polymerization catalysts, usually containing magnesium halide and alcohol compounds; in one embodiment, the magnesium-containing carrier contains the general formula: Magnesium halides of MgXY, compounds with the general formula ROH, compounds with the general formula R'OH, and dihydrocarbyloxyhydrocarbon compounds; wherein, X in the general formula MgXY is halogen, Y is halogen, C 1 -C 14 Alkyl, C 1 -C 14 Alkoxyl, C 6 -C 14 Aryl or C 6 -C 14 The aryloxy group; in the general formula ROH, R is C 1 -C 8 Alkyl or C 3 -C 8 Cycloalkyl; in the general formula R'OH, R' is C 16 -C 24 The alkyl or aralkyl group; the structure of the dihydrocarbyloxy hydrocarbon compound is shown in formula (II), and the structure of the oxirane compound is shown in formula (III):

[0032] Formula (Ⅱ), Formula (Ⅲ);

[0033] Among th...

preparation example 1

[0067] This preparation example is used to prepare the catalyst solid component used in the preparation method of the polypropylene product of the present invention.

[0068] (1) Preparation of magnesium-containing carrier

[0069] In a 1.6L reactor, add 200ml white oil, 8.0g (0.08mol) magnesium chloride, 3g (0.01mol) octadecyl alcohol, 95ml (1.6mol) ethanol, 9.8ml (0.08mol) 2,2-dimethoxy base propane, heated to 90°C with stirring. After reacting at constant temperature for 1 hour, the mixture was stirred at high speed (400 rpm) for 30 minutes to disperse for emulsification. Add 35 ml (0.45 mol) of epichlorohydrin to the above emulsified product, react for half an hour, press filter, wash the press filter product 5 times with hexane, and vacuum dry to obtain the magnesium-containing carrier Z1.

[0070] The average particle diameter (D50) of the magnesium-containing carrier Z1 is 57 microns, and the particle size distribution ((D90-D10) / D50) is 0.8. The particle morphology ...

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Abstract

The invention discloses a polypropylene product and a preparation method thereof. A weight-average molecular weight of the polypropylene product is 1.5-3.4*10<5>; a molecular weight distribution index is 3-15; an isotactic index of the polypropylene product is 96.5-99.5%; and a melt flow rate of the polypropylene product and a value of the isotactic index meet the following equation: -0.258ln(x)+98.97-0.28 <= y <= -0.258ln(x)+98.97+0.28, wherein y represents the isotactic index of the polypropylene product; and x represents the melt flow rate of the polypropylene product, measured according to ASTM D1238-99, with a unit being g / 10 minutes. Compared with a conventional polypropylene product having the same melt strength, the polypropylene product provided by the invention has high isotacticity.

Description

technical field [0001] The invention relates to a polypropylene product and a preparation method thereof. Background technique [0002] Polypropylene has many advantages, such as lighter than water, relatively high flexural modulus and melting point, good processability, excellent chemical stability, electrical insulation, and cheap and easy-to-obtain propylene raw materials required for the manufacture of polypropylene. Although polypropylene material has these advantages, in some fields, due to its own characteristics, when it has a high melt mass flow index, its isotacticity is low; when the isotacticity is high, the melt index lower. In the prior art, when the isotacticity of the propylene polymer is 96-99%, the melt flow rate measured according to ASTM D1238-99 is often only 0.5-35 g / 10 minutes; while according to ASTM D1238-99 When the melt flow rate is 40-50 g / 10 minutes, the isotacticity of the propylene polymer is only 91-95%. The above-mentioned situation result...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/06C08F4/649C08F4/654C08F4/651C08F4/02
Inventor 凌永泰夏先知刘月祥张纪贵李威莅高富堂赵瑾谭扬高平彭人琪乔素珍
Owner CHINA PETROLEUM & CHEM CORP
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