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Polypropylene, preparation method and applications thereof

A technology of polypropylene and polypropylene resin, which is applied in the field of olefin polymerization, can solve problems such as difficulty in meeting requirements, achieve the effects of reducing production costs and energy consumption, low ash content, and simplifying the production process

Pending Publication Date: 2019-04-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ash content of ordinary polypropylene product powder is 100-150ppm. After adding additives after granulation, the ash content in the final product is generally around 300ppm, which is difficult to meet the requirements.

Method used

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  • Polypropylene, preparation method and applications thereof
  • Polypropylene, preparation method and applications thereof
  • Polypropylene, preparation method and applications thereof

Examples

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Effect test

preparation example Construction

[0023] The present invention also provides the preparation method of above-mentioned polypropylene, and this method comprises the following steps,

[0024] 1) Precontacting the catalyst component A, the alkylaluminum compound B and an optional external electron donor C;

[0025] 2) carrying out the prepolymerization reaction with the product after the precontact reaction obtained in step 1) and propylene, and then carrying out the polymerization reaction,

[0026] Wherein, the catalyst component A includes magnesium, titanium, halogen and at least two internal electron donors a and b.

[0027] The preparation method of polypropylene provided by the invention can directly obtain high-purity polypropylene from a batch bulk polymerization reactor without a washing and deashing process.

[0028] In the present invention, in step 1), the conditions of the precontact reaction include: the precontact reaction temperature is -10°C to 30°C, and the precontact reaction time is 0.5-40mi...

Embodiment 1

[0093] 1) Preparation of spherical catalyst components

[0094] In a 300ml stirred glass reaction bottle fully replaced by high-purity nitrogen, add 90ml of titanium tetrachloride and 10ml of hexane, cool to -20°C, and add 8g of spherical magnesium chloride alcoholate carrier (for the preparation method, refer to the Chinese patent The method described in Example 1 in CN1330086A), under stirring, the temperature was slowly raised to 110°C in stages, and 1.5ml of 2,4-pentanediol dibenzoate and 1.5ml of 2-iso Propyl-2-isoamyl-1,3-dimethoxypropane, keep the temperature for 0.5h after reaching 110°C, then filter off the liquid, add titanium tetrachloride to treat, then wash with hexane five times, and vacuum dry A spherical catalyst is obtained.

[0095] 2) Polymerization of propylene

[0096] Add 150mL of anhydrous hexane, 60mL of triethylaluminum and 10mL of external electron donor compound (methylcyclohexyldimethoxysilane) respectively in a 500 ml precontact stirred tank, 12 ...

Embodiment 2

[0098] The preparation of the spherical catalyst component is the same as in Example 1.

[0099] Propylene polymerization was the same as in Example 1 except that 4 tons of fresh propylene was used.

[0100] The obtained propylene homopolymer was weighed and analyzed after drying, and the results are shown in Table 1.

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Abstract

The present invention relates to the field of olefin polymerization, and discloses a polypropylene preparation method, polypropylene prepared by the method, and applications of the polypropylene. Thepreparation method comprises: 1) carrying out a pre-contact reaction on a catalyst component A, an alkyl aluminum compound B and an optional external electron donor C; and 2) carrying out a pre-polymerization reaction on the pre-contact reaction product obtained in the step 1) and propylene, and carrying out a polymerization reaction, wherein the catalyst component A comprises magnesium, titanium,halogen and at least two internal electron donors a and b. According to the present invention, with the preparation method, the high-purity polypropylene can be obtained through the direct polymerization, the post-treatment process of the solvent washing and ash removal is eliminated, the high-purity polypropylene production process is substantially simplified, the production cost and the energyconsumption are reduced, and the product production process is environmentally-friendly due to the reduction of the use and recovery of a large number of solvents.

Description

technical field [0001] The invention relates to the field of olefin polymerization, in particular to a method for preparing polypropylene, polypropylene prepared by the method and applications of the polypropylene. Background technique [0002] Batch bulk polypropylene technology is a production technology successfully developed by China itself. It has the advantages of reliable production technology, low requirements on the quality of raw material propylene, simple process, low investment, quick return, simple operation and less waste. [0003] The equipment for the production of polypropylene by the batch liquid phase bulk method mainly includes process units such as raw material refining, polymerization reaction, flash deactivation, granulation and packaging. The process unit of the polymerization reaction includes propylene metering tank, activator feeding tank, catalyst feeding tank, hydrogen metering tank, reactor, hot water tank, hot water pump, cold water pipeline a...

Claims

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Application Information

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IPC IPC(8): C08F110/06C08F4/649C08F4/646C08L23/12C08J5/18
CPCC08F110/06C08J5/18C08J2323/12C08F4/6494C08F4/6465C08F2500/26
Inventor 赵瑾夏先知张天一刘月祥任春红谭扬凌永泰高富堂李威莅陈龙
Owner CHINA PETROLEUM & CHEM CORP
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