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Polypropylene material with high melt strength and preparation method thereof

A high-melt-strength, composite material technology, applied in the field of high-melt-strength polypropylene composite materials, can solve the problems of complex extrusion and granulation process, increase cost, etc. simple effect

Inactive Publication Date: 2012-07-11
SHANGHAI PRET COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Patent CN101423615A reports that floating liquid type PTFE is used as a polyolefin melt strength modifier. The method is to mix the PTFE dispersed in the floating liquid with resin, and then dry it through specific equipment, thereby solving the feeding problem of fibrillated PTFE , but special equipment is required for drying, which not only increases the cost, but also complicates the extrusion granulation process

Method used

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  • Polypropylene material with high melt strength and preparation method thereof
  • Polypropylene material with high melt strength and preparation method thereof
  • Polypropylene material with high melt strength and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Dry mix 89.3% polypropylene, 10% polyethylene, 0.3% MM5935EF, 10100.1% heat stabilizer, 1680.2% heat stabilizer, and 0.1% heat stabilizer DSTP in a high-speed mixer for 3-5 minutes, and then Melt extrusion and granulation in twin-screw extruder, the process is: zone 1 160-180℃, zone 2 200-210℃, zone 3 210-220℃, zone 4 210-220℃, zone 5 210- 220°C, six zone 205-215, seven zone 200-210, pressure 12-18MPa.

Embodiment 2

[0026] Dry mix 89.3% polypropylene, 10% polyethylene, MM5935EF 0.5%, heat stabilizer 10100.1%, heat stabilizer 1680.2%, heat stabilizer DSTP 0.1% in a high-speed mixer for 3-5 minutes, and then Melt extrusion and granulation in twin-screw extruder, the process is: zone 1 160-180℃, zone 2 200-210℃, zone 3 210-220℃, zone 4 210-220℃, zone 5 210- 220°C, six zone 205-215, seven zone 200-210, pressure 12-18MPa.

Embodiment 3

[0028] Dry-mix 94.2% polypropylene, 5% polyethylene, MM5935EF 0.2%, 10100.15% heat stabilizer, 1680.3% heat stabilizer, 0.15% heat stabilizer DSTP in a high-speed mixer for 3-5 minutes, and then Melt extrusion and granulation in twin-screw extruder, the process is: zone 1 160-180℃, zone 2 200-210℃, zone 3 210-220℃, zone 4 210-220℃, zone 5 210- 220°C, six zone 205-215, seven zone 200-210, pressure 12-18MPa.

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Abstract

The invention discloses a polypropylene material with high polypropylene melt strength and a preparation method thereof. The polypropylene material comprises following components by weight percentage: 88 to 99 percent of polypropylene, 0 to 10 percent of polyethylene, 0.1 to 1.0 percent of surface-modified high molecular weight polytetrafluoroethylene and 0.1 to 1.0 percent of heat stabilizers. The specific preparation method comprises the steps that the polypropylene, the polyethylene, the surface-modified high molecular weight polytetrafluoroethylene and the heat stabilizers are evenly mixed by using a high speed material mixer and placed in a twin-screw extruder to be melted, extruded and pelletized. The polypropylene material has the characteristics that the melt strength is high, melt sag phenomena of the melted polypropylene, which occur in the fields of extrusion and blow-molding application, can be effectively reduced. The preparation method has the advantages of simple operation process, relative low cost and obvious material modification effect.

Description

technical field [0001] The invention relates to a high-melt-strength polypropylene composite material. More specifically, by adding a surface-modified high-molecular-weight polytetrafluoroethylene, the melt strength of molten polypropylene can be effectively improved, and the process of extrusion and blow molding can be reduced. The phenomenon of sagging and dripping. The invention also relates to a method for preparing the composite material. Background technique [0002] The melt strength of a polymer is an important parameter for its applications in processes such as extrusion coating, blow molding, profile extrusion, thermoforming and foaming. [0003] When ordinary polypropylene (PP) is thermoformed in a viscoelastic state, its melt strength decreases sharply with the increase of processing temperature, resulting in sagging of the sheet, local thinning in melt thermoforming, and flow during co-extrusion of the structure. unstable. This is due to the fact that PP is a...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/06C08L27/18B29B9/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40
Inventor 徐美玲张鹰张祥福周文
Owner SHANGHAI PRET COMPOSITES
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