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Propylene polymer and preparation method thereof

A technology of propylene polymer and polypropylene polymer, which is applied in the field of propylene polymer and its preparation, can solve the problems of polymer molecular weight decrease, brittleness, catalyst activity decrease, etc., and achieve good stereospecificity and high hydrogen sensitivity , the effect of high polymerization activity

Active Publication Date: 2014-05-14
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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  • Propylene polymer and preparation method thereof
  • Propylene polymer and preparation method thereof
  • Propylene polymer and preparation method thereof

Examples

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preparation example Construction

[0024] According to the preparation method of propylene polymer of the present invention, the method comprises polymerizing propylene or a mixture of propylene and ethylene and / or α-olefin under olefin polymerization conditions in the presence of a catalyst to obtain a propylene polymer, the catalyst Containing a solid component, an alkylaluminum compound and an external electron donor compound, the solid component comprising magnesium, titanium, halogen and an internal electron donor compound, the internal electron donor compound comprising a phthalate compound, Wherein, the solid component is prepared by the following method:

[0025] (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;

[0026] (2) The product obtained in step (1) is subjected to solid-liquid separation, a...

preparation example 1

[0069] This preparation example is used to prepare the catalyst solid component used in the preparation method of the propylene polymer of the present invention.

[0070] (1) Preparation of magnesium-containing carrier

[0071] 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 constant temperature reaction for 1 hour, the mixture was stirred (400 rpm) for 30 minutes to disperse for emulsification. Add 35ml (0.45mol) of epichlorohydrin to the above emulsified product, react for half an hour and press filter for 9 minutes. The press-filtered product was washed 5 times with hexane, and press-filtered after each wash. The total time of the press-filtering process was 20 minutes. Finally, the product was vacuum-dried to obtain the magnesium-containing carrier Z1.

[0072] The average particle diameter (D50) of the magnesiu...

preparation example 2

[0076] This preparation example is used to prepare the catalyst solid component used in the preparation method of the propylene polymer of the present invention.

[0077] (1) Preparation of magnesium-containing carrier

[0078] In a 1.6L reactor, add 300ml of white oil, 8.0g (0.08mol) of magnesium chloride, 10.8g (0.04mol) of stearyl alcohol, 28ml (0.48mol) of ethanol, 1ml (0.008mol) of 2,2-dimethoxy base propane, heated to 100°C with stirring. After constant temperature reaction for 0.5 hours, the mixture was stirred (800 rpm) for 30 minutes to disperse for emulsification. And add 12.5ml (0.16mol) epichlorohydrin to the above emulsified product, react for 20 minutes and press filter, the filter press time is 10 minutes. The press-filtered product was washed 5 times with hexane, and press-filtered after each wash. The total time of the press-filtering process was 25 minutes. Finally, the product was vacuum-dried to obtain the magnesium-containing carrier Z2.

[0079] The a...

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Abstract

The invention relates to a propylene polymer and a preparation method thereof. The MW of the polymer is 1.6-3.1*10<5>. The MW / Mn of the polymer is 3-15. The isotactic index of the polymer is 96.2-99.5%. The melt flow rate and the isotactic index satisfy the following formula: 101.0-1.1ln(x)-0.5<=y<=101.0-1.1ln(x)+0.5, wherein the y is the isotactic index and the x is the melt flow rate measured according to ASTM D1238-99 with the unit of g / 10min. The isotactic index of the propylene polymer provided by the invention is higher than that of polypropylene in the prior art with the same melt index as the propylene polymer provided by the invention.

Description

technical field [0001] The invention relates to a propylene polymer 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 results in...

Claims

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Application Information

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