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Impact-resistant polypropylene material with high melt strength and preparation method therefor

A polypropylene material, high melt strength technology, applied in the field of polypropylene materials, can solve problems such as insufficient rigidity, toughness or impact resistance

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned patents report the preparation method of high melt strength homopolypropylene or random copolymer polypropylene, that is to say, the homopolypropylene or random copolymer polypropylene prepared by these methods has higher melt strength Strength, but insufficient stiffness, toughness or impact properties, limiting the applications of the resulting polypropylene

Method used

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  • Impact-resistant polypropylene material with high melt strength and preparation method therefor
  • Impact-resistant polypropylene material with high melt strength and preparation method therefor
  • Impact-resistant polypropylene material with high melt strength and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0064] The propylene polymerization reaction is carried out on a polypropylene unit, and the main equipment of the unit includes a prepolymerization reactor, a first loop reactor, a second loop reactor and a third gas phase reactor. The polymerization method and steps are as follows.

[0065] (1) Prepolymerization reaction

[0066] The main catalyst (DQC-401 catalyst, provided by Sinopec Catalyst Company Beijing Aoda Branch), the cocatalyst (triethylaluminum), the first external electron donor (dicyclopentyl-dimethoxysilane, DCPMS) after 6 ℃, 20min after pre-contact, continuously into the continuous stirred tank prepolymerization reactor for prepolymerization reactor. The flow rate of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow rate of dicyclopentyl-dimethoxysilane is 0.3g / hr, the flow rate of the main catalyst is 0.6g / hr, and the ratio of TEA / DCPMS is 50 (mol / mol). The pre-polymerization is carried out in the bulk environment of the ...

Embodiment 2

[0074] The catalyst used in embodiment 2, pre-complexation, polymerization process conditions and auxiliary agent formula and add-on are the same as embodiment 1. The difference with Example 1 is: the amount of hydrogen in the second reactor becomes 6000ppm in the second stage, and the H in the second step gas phase reactor 2 / (C 2 +C 3 ) adjusted to 0.17 (v / v). The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

Embodiment 3

[0076] The catalyst used in embodiment 3, pre-complexation, polymerization process conditions and auxiliary agent formula and addition are the same as embodiment 1. The difference with Example 1 is: the amount of hydrogen in the second reactor becomes 13000ppm in the second stage, and the H in the second step gas phase reactor 2 / (C 2 +C 3 ) adjusted to 0.49 (v / v). The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

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Abstract

The invention provides an impact-resistant polypropylene material with high melt strength and a preparation method therefor. The polypropylene material comprises a propylene homopolymer component and a propylene-ethylene copolymer component; the molecular-weight distribution Mw / Mn of the material is smaller than or equal to 10 and is greater than or equal to 4; Mz+1 / Mw is greater than 10 and is smaller than 20; the room-temperature xylene soluble content of the material is higher than 10wt% and is lower than 30wt%; and the ratio of room-temperature trichlorobenzene soluble Mw to room-temperature trichlorobenzene insoluble Mw is greater than 0.4 and is smaller than 1. According to the method provided by the invention, a homopolymerized polypropylene continuous phase, which has a specific melt index and has extremely wide molecular weight distribution, is prepared through using external electron donors of different types and use levels and hydrogen gas of different use levels separately at different polymerization stages, then, propylene and ethylene copolymerization is further carried out so as to obtain a rubber phase, and then, the impact-resistant polypropylene material with high melt strength, high rigidity and high toughness is obtained.

Description

technical field [0001] The invention relates to a polypropylene material, in particular to an impact-resistant polypropylene material with high melt strength and a preparation method thereof. Background technique [0002] Impact polypropylene has excellent high and low temperature impact strength, high tensile strength, rigidity such as flexural modulus, and high heat resistance temperature, and has been widely used in many fields, such as molded or extruded automotive parts , home appliance parts, containers and household items, etc. Due to its low melt strength, impact polypropylene is usually used for injection processing, but when it is used for blow molding, there are problems such as unstable mold size, uneven product thickness or even failure to form. [0003] The common way to improve the melt strength of polypropylene is to reduce the melt index, that is, to increase the molecular weight of polypropylene, but this will cause difficulties in melting and extruding th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/16C08F110/06C08F210/16C08F4/646
Inventor 宋文波乔金樑张师军毕福勇郭梅芳殷建军邹发生尹华王良诗胡慧杰
Owner CHINA PETROLEUM & CHEM CORP
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