Polyethylene cross-linked and modified polypropylene combination thereof

A polyethylene cross-linking and cross-linking product technology, which is applied in the field of polypropylene compositions, can solve the problems of difficult processing, inconvenient practical application, and high price of POE raw materials, and achieve good toughening performance and remarkable toughening effect

Active Publication Date: 2009-10-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main raw material of the elastomer, POE, is a thermoplastic elastomer. Although its toughness is very high, its rigidity and tensile strength are difficult to compare with polyolefin plastics, and this kind of masterbatch needs to be hot-cut and pelletized on the water ring die surface, which is difficult to process. POE raw materials The price is very high, which brings a lot of inconvenience to the practical application

Method used

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  • Polyethylene cross-linked and modified polypropylene combination thereof
  • Polyethylene cross-linked and modified polypropylene combination thereof
  • Polyethylene cross-linked and modified polypropylene combination thereof

Examples

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preparation example Construction

[0019] The preparation method of the metallocene polyethylene cross-linked product of the present invention is as follows: metallocene polyethylene, low-density polyethylene, and inorganic rigid filler are sequentially added to a low-speed mixer according to the proportion in the cross-linked product for pre-mixing, and the above-mentioned mixed The materials are fed into the corotating parallel twin-screw extruder for granulation.

[0020] The rotational speed of the low-speed mixer is 80-150 rpm, the pre-mixing time is preferably 1-5 minutes, and the mixing time after adding the crosslinking agent is preferably 5-20 minutes. The mixing temperature is preferably 15-40°C. After the mixed materials are put into the extruder, it is preferable to control the temperature of each zone of the extruder to be between 170-220° C., the rotational speed of the screw to be 150-250 rpm, and the rotational speed of the feeder to be 20-50 rpm.

[0021] The polyethylene cross-linked product ...

example 1

[0030] The following example prepares the polyethylene cross-linked product described in the present invention.

[0031] Get 1800 grams of metallocene polyethylene [Exxon company produces, trade mark EXCEED 350D65, metallocene catalyst is two (cyclopentadienyl) zirconium dichlorides, melt index 1.2g / 10min, density is 0.918g / cm 3 ], 1200 grams of low-density polyethylene (produced by Qilu Petrochemical Company, brand name TN26, melt index 2.7g / 10min, density of 0.920g / cm2 produced by high-pressure gas-phase method 3 ), 9 grams of di-tert-butyl peroxide (DTBP).

[0032] Mix EXCEED 350D65 and TN26 in a mixer with a rotation speed of 100 rpm at 25°C for 3 minutes, then add DTBP and mix for 10 minutes to form a mixture. Put the mixture into the co-rotating parallel twin-screw extruder to granulate, control the temperature of each zone of the extruder to control the temperature of the first to fifth zones of the extruder to be 170°C, 190°C, 200°C, 210°C, 215°C, and the sixth to eig...

example 2

[0034] Prepare polyethylene cross-linked product A according to the method of example 1 2 , the difference is that 9 grams of double "2,5" vulcanizing agent is used instead of DTBP, and the obtained polyethylene cross-linked product A 2 The cross-linking degree and composition are shown in Table 1.

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Abstract

A polyethylene cross-linked product, comprising 30-80% by mass of metallocene polyethylene, 19-50% by mass of low-density polyethylene, 0-30% by mass of inorganic rigid filler and 0.1-1.0% by mass of cross-linked agent. The cross-linked product has strong toughness and is used for homopolymer polypropylene modification to obtain a modified polypropylene composition with high toughness while still maintaining high rigidity and good tensile properties.

Description

technical field [0001] The present invention is a polyethylene cross-linked product and its modified polypropylene composition, specifically, a cross-linked product made of two different types of polyethylene and the cross-linked product Modified polypropylene composition. Background technique [0002] Homopolypropylene is one of the most important thermoplastic resins. It is the common goal of researchers to continuously improve its performance and expand its application range. Improving the toughness of homopolypropylene is always the main direction of modification work. The commonly used toughening method for homopolypropylene toughening modification is to add rubber components to the blend modification system, mainly EPDM, ethylene-propylene rubber (EPR), ethylene-octene copolymer (POE ), styrene-butadiene block copolymer (SBS), hydrogenated styrene-butadiene block copolymer (SEBS), etc., but adding more elastomers to the system will make other properties of polypropyle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L23/12C08K5/14C08J3/24C08K3/36C08K3/22C08K3/30
Inventor 杨军忠刘伟王延伟孙春燕王军景振华郭丰平
Owner CHINA PETROLEUM & CHEM CORP
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