High melt strength polypropylene (PP) prepared by pre-irradiation technology and preparation method thereof

A high melt strength, polypropylene technology, applied in the field of polymer composite materials, can solve the problems of low melt viscosity and melt strength, low bubble wall strength, difficult to blow film, etc., to achieve simple preparation process, melt strength High, simple raw material effect

Inactive Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polypropylene (PP) also has the disadvantages of low melt viscosity and melt strength during processing, which can easily cause uneven thickness of the product during thermoforming, curling during extrusion and calendering, uneven size and bubble walls during foaming. Defects such as low strength and difficult blown film greatly limit the application of polypropylene in certain fields

Method used

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  • High melt strength polypropylene (PP) prepared by pre-irradiation technology and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A high melt strength polypropylene obtained by reactive extrusion of a polypropylene composition of:

[0030] 1 part of low-density polyethylene, the pre-irradiation dose is 100kGy; 99 parts of polypropylene.

[0031] The preparation method of above-mentioned high melt strength polypropylene:

[0032] The raw materials are mixed evenly in a high-speed mixer according to the composition ratio, and then passed through a twin-screw extruder with a length-to-diameter ratio of L / D=40 and a diameter of 35mm, and melt-extruded at a screw speed of 100 rpm and a reaction temperature of up to 170°C. Pelletizing to obtain high melt strength polypropylene resin.

[0033] The properties and melt strength results of the samples are shown in Table 1.

[0034]

Embodiment 2

[0036] A high melt strength polypropylene obtained by reactive extrusion of a polypropylene composition of:

[0037] 3 parts of linear low density polyethylene, pre-irradiation dose of 100kGy; 97 parts of polypropylene.

[0038] The preparation method of above-mentioned high melt strength polypropylene:

[0039] The raw materials are mixed evenly in a high-speed mixer according to the composition ratio, and then passed through a twin-screw extruder with a length-to-diameter ratio of L / D=40 and a diameter of 35mm, and melt-extruded at a screw speed of 100 rpm and a reaction temperature of up to 190°C. Pelletizing to obtain high melt strength polypropylene resin.

[0040] The properties and melt strength results of the samples are shown in Table 1.

[0041]

Embodiment 3

[0043] A high melt strength polypropylene obtained by reactive extrusion of a polypropylene composition of:

[0044] 3 parts of high-density polyethylene, pre-irradiation dose of 100kGy; 99 parts of polypropylene.

[0045] The preparation method of above-mentioned high melt strength polypropylene:

[0046] The raw materials are mixed evenly in a high-speed mixer according to the composition ratio, and then passed through a twin-screw extruder with a length-to-diameter ratio of L / D=40 and a diameter of 35mm, and melt-extruded at a screw speed of 100 rpm and a reaction temperature of up to 170°C. Pelletizing to obtain high melt strength polypropylene resin.

[0047] The properties and melt strength results of the samples are shown in Table 1.

[0048]

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Abstract

The invention discloses high melt strength polypropylene (PP) prepared by a pre-irradiation technology and a preparation method thereof. The high melt strength PP is prepared through reactive extrusion of a PP composition comprising the following components: 1-15 parts by mass of polyethylene (PE) or PE copolymer after pre-electron-irradiation treatment and 85-99 parts by mass of PP not subjected to irradiation treatment, wherein the pre-irradiation dose is 5-100kGy. The preparation method of the high melt strength PP comprises the following steps: after mixing the components uniformly, carrying out melt extrusion and granulation on the mixture in a twin-screw extruder at a screw speed of 100-250r / min and temperature of 170-260 DEG C, thus preparing the high melt strength PP.

Description

technical field [0001] The invention relates to a high-melt-strength polypropylene and a preparation method thereof, in particular to a method of pretreating polyethylene or polyethylene-based copolymers by applying high-energy ray irradiation, and preparing high-melt-strength polypropylene by twin-screw reactive extrusion. The method for propylene belongs to the field of polymer composite materials. Background technique [0002] Polypropylene (PP) is one of the most widely used general-purpose thermoplastics. It has excellent characteristics such as low density, wide range of sources, no odor, strong corrosion resistance, high temperature resistance, good mechanical properties, and low price. However, polypropylene (PP) also has the disadvantages of low melt viscosity and melt strength during processing, which can easily cause uneven thickness of the product during thermoforming, curling during extrusion and calendering, uneven size and bubble walls during foaming. Defects...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10C08L23/06C08L23/08C08J3/28B29B9/06
CPCB29B9/06B29C48/92B29C2948/9258B29C2948/92704C08J3/28C08J2323/06C08J2323/08C08L23/10C08L2207/062C08L2207/066C08L23/06C08L23/0815C08L23/0869C08L23/0861
Inventor 魏玉函柯卓
Owner CHINA PETROLEUM & CHEM CORP
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