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Impact-resistant polypropylene material with high melt strength

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

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
  • Impact-resistant polypropylene material with high melt strength
  • Impact-resistant polypropylene material with high melt strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 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.

[0068] (1) Prepolymerization reaction

[0069] The main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), co-catalyst (triethylaluminum), and the first external electron donor (isopropylcyclopentyldimethoxysilane, IPCPMS) were After pre-contacting at 6°C for 20 minutes, it is continuously fed into a continuous stirred tank prepolymerization reactor for prepolymerization. The flow of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow of isopropylcyclopentyldimethoxysilane is 0.3g / hr, the flow of main catalyst is 0.6g / hr, TEA / IPCPMS The ratio is 50 (mol / mol). The pre-polymerization is carried out in the bulk environment of...

Embodiment 2

[0077] 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 7000ppm in the second stage, and the H in the second step gas phase reactor 2 / (C 2 +C 4 ) adjusted to 0.20 (v / v). The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

Embodiment 3

[0079] 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 10000ppm in the second stage, and the H in the second step gas phase reactor 2 / (C 2 +C 4 ) adjusted to 0.51 (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 an ethylene-1-butylene copolymer component; the weight ratio of the ethylene-1-butylene copolymer component to the propylene homopolymer component is (11-80): 100, and the content of butylene in an ethylene-1-butylene copolymer is higher or equal to 20wt% and is lower or equal to 45wt%; and the ratio of room-temperature trichlorobenzene soluble Mw of the material to room-temperature trichlorobenzene insoluble Mw of the material is greater than 0.5 and is smaller than or equal to 1. The polypropylene material provided by the invention has high melt strength, also has the characteristics of high rigidity and high toughness and is extensive in application, for example, is applicable to the fields of automotive parts, medical appliances, household items and the like.

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): C08L23/12C08L23/08C08F110/06C08F210/16C08F4/646
Inventor 郭梅芳黄红红殷建军宋文波张师军乔金樑刘宣伯侯莉萍李娟邹发生尹华
Owner CHINA PETROLEUM & CHEM CORP
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