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Preparation method of high-melt fluidity high-rigidity antishock polypropylene

A melt mass flow and fluidity technology, applied in the field of polypropylene preparation, can solve the problems of limited improvement of polymer impact resistance, inability to achieve high impact polypropylene, low molecular weight of copolymers, etc. Melt mass flow rate, easy handling, high rigidity effect

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

This method uses a single external electron donor, which meets the requirements of hydrogen modulation sensitivity, but cannot realize the production of high-impact polypropylene, because the copolymerization ability of alkyl trialkoxysilane with good hydrogen modulation sensitivity is poor, and the preparation The molecular weight of the copolymer is low, and the improvement of the impact resistance of the polymer is very limited

Method used

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  • Preparation method of high-melt fluidity high-rigidity antishock polypropylene

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The polymerization reaction was carried out on a set of 25Kg / hr polypropylene pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor, second loop reactor and third gas phase reactor. Polymerization method and steps are as follows:

[0040] Step I

[0041] Prepolymerization:

[0042] The main catalyst (DQ-VI catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), co-catalyst (triethylaluminum), and the first external electron donor (isobutyltriethoxysilane) were preheated at 6°C for 20 minutes. After contact, continuously add to the continuous stirred tank prepolymerization reactor for prepolymerization reactor, the flow rate of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, isobutyltriethoxysilane (DIBTES ) flow rate is 0.63g / hr, main catalyst flow rate is 0.01g / hr, TEA / DIBTES ratio is 10 (mol / mol). The prepolymerization is carried out in the bulk environment of propylene liquid phase, the t...

Embodiment 2~4

[0051] The steps are the same as in Example 1, except that the hydrogen concentration detected by hydrogen on-line chromatography is changed to 2000ppm, 3500ppm and 5000ppm respectively in the feed of the loop reactor in the step i. The obtained polymer analysis results and polymer physical properties are listed in Table 1.

Embodiment 5~7

[0057] Step is with embodiment 1, and difference is: the H of the reactor in the step Ⅲ 2 The concentration was changed to 6000ppm, 8000ppm and 10000ppm respectively. The obtained polymer analysis results and polymer physical properties are listed in Table 1.

[0058] It can be seen from Table 1 that the isotactic index of the polypropylene prepared by the method provided by the present invention has been significantly improved, and the flexural modulus of the final product has been improved. Through the method provided by the invention, different silane compound external electron donors are added in different reaction stages, combined with the regulation of the amount of hydrogen added, the polypropylene material with high rigidity, high toughness and high melt flow rate can be prepared.

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Abstract

The invention discloses a method of high-melt fluidity high-rigidity antishock polypropylene. The method is characterized by comprising the following steps: 1) under the effect of hydrogen and a Ziegler-Natta catalyst of a trialkoxyl silicane-containing compounds external electron donor, propylene or propylene and alpha-alkene are polymerized to obtain a polymer A; 2) a dialkoxysilanes compound external electron donor is added for premixing with the polymer A; 3)under the premixed material in the step 2) and hydrogen, propylene and alpha-alkene are polymerized to obtain a polymer B with melt mass flux rate of 0.01-30g / min; the antishock polypropylene comprising the polymer A and the polymer B can be finally obtained, the melt mass flux rate is 20-1000g / 10min, and preferably is 20-100g / 10min. The provided method has the advantages of easy operation, convenient operation and easy industrial production, so that high performance polypropylene with high melt mass flux rate, high rigidity and high antishock strength is prepared, and the high-melt fluidity high-rigidity antishock polypropylene has wide application and prospect.

Description

technical field [0001] The invention relates to a method for preparing polypropylene, in particular to a method for preparing impact-resistant polypropylene with high melt fluidity. Background technique [0002] High melt fluidity polypropylene is easy to form and process, and can reduce processing temperature, injection pressure, mold clamping force, etc. during product processing and production, thereby reducing energy consumption, shortening the molding cycle of products, and increasing product output. It has unique advantages especially in injection molding large thin-walled products and complex products. With the continuous development of domestic large-scale thin-wall injection products, the demand for high melt fluidity polypropylene raw materials is increasing day by day. The development of high melt fluidity polypropylene production technology has become a new challenge for major polypropylene production enterprises and application enterprises to occupy the market,...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F4/646
Inventor 毕福勇宋文波杨光张晓萌魏文骏郭梅芳张师军
Owner CHINA PETROLEUM & CHEM CORP
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