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Method for preparing impact-resistant polypropylene material with high melt strength

A polypropylene material, high melt strength technology, applied in the field of polypropylene material preparation, can solve the problems of limiting polypropylene, insufficient toughness and impact resistance, etc., and achieve the effect of improving toughness and high melt strength

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 toughness and impact resistance, limiting the applications of the resulting polypropylene

Method used

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  • Method for preparing impact-resistant polypropylene material with high melt strength
  • Method for preparing impact-resistant polypropylene material with high melt strength
  • Method for preparing impact-resistant polypropylene material with high melt strength

Examples

Experimental program
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Effect test

Embodiment 1

[0068] 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.

[0069] (1) Prepolymerization reaction

[0070] The main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), co-catalyst (triethylaluminum), and the first external electron donor (diisopropyldimethoxysilane, DIPMS) were tested at 6 °C , After 20min pre-contact, continuously add to the continuous stirred tank type pre-polymerization reactor for pre-polymerization reactor. The flow of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow of diisopropyldimethoxysilane is 0.3g / hr, the flow of main catalyst is 0.6g / hr, and the ratio of TEA / DIPMS is 50 (mol / mol). The pre-polymerization is carried out in the bulk environment of the p...

Embodiment 2

[0078] 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 from Example 1 is that the comonomer ethylene in the first stage and the second stage in the first step is changed to 1-butene, and the addition amount of the first and second ring pipes is 10 mol%. The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

Embodiment 3

[0080] The catalyst used in embodiment 3, pre-complexation, polymerization process conditions and auxiliary agent formula and addition are the same as embodiment 1. Difference with embodiment 1 is: the comonomer ethylene of the first stage and the second stage in the first step is changed into ethylene+1-butene, the ethylene addition of the first and the second ring pipe is 6000ppm, The addition amount of 1-butene is 5mol%. . 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 a method for preparing an impact-resistant polypropylene material with high melt strength. The method comprises the steps of carrying out a propenyl random copolymerization reaction in the presence of a first random copolymerization polypropylene so as to obtain a random-copolymerized polypropylene continuous phase containing the first random copolymerization polypropylene and a second random copolymerization polypropylene, and then, carrying out a propylene-ethylene copolymerization reaction in the presence of the random-copolymerized polypropylene continuous phase so as to obtain the polypropylene material containing a propylene-ethylene copolymer. According to the method, a random polypropylene continuous phase, which has a specific melt index, contains a large number of ultrahigh-molecular-weight ingredients and is extremely wide in molecular weight distribution, is prepared through using external electron donors of different types and use levels and a chain transfer agent, i.e., 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 dispersed in the continuous phase, and then, the impact-resistant polypropylene material with high melt strength, high rigidity and high toughness is obtained and is extensive in application.

Description

technical field [0001] The invention relates to a preparation method of a polypropylene material, in particular to a preparation method of an impact-resistant polypropylene material with high melt strength. 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 a...

Claims

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Application Information

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IPC IPC(8): C08F210/06C08F210/16C08F4/646C08F4/649C08L23/16C08L23/14
Inventor 宋文波乔金樑郭梅芳毕福勇张师军殷建军邹发生胡慧杰
Owner CHINA PETROLEUM & CHEM CORP
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