Expandable high-melt-strength polypropylene resin and preparation method thereof

A technology of polypropylene resin and high melt strength, which is applied in the field of polymer materials, can solve problems such as environmental impact, and achieve the effect of high melt degree and good foaming performance

Inactive Publication Date: 2012-01-04
WUHAN VIRENTIA ADVANCED MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many studies in the chemical grafting method, but some adopt a large amount of organic solvents or volatile monomers to h...

Method used

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  • Expandable high-melt-strength polypropylene resin and preparation method thereof
  • Expandable high-melt-strength polypropylene resin and preparation method thereof
  • Expandable high-melt-strength polypropylene resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Preparation of High Melt Strength Polypropylene Resin

[0026]

[0027] Method 1: Polypropylene, petroleum resin, ultra-high molecular weight polyethylene, dicumyl peroxide, bis-[γ-(triethoxysilyl)propyl]tetrasulfide, antioxidant Stir in the mixer at 900-1200 rpm and 60°C for 15 minutes, and then add it to the two-stage extruder: the first stage of the two-stage extruder is a parallel twin-screw extruder, and the long diameter of the extruder is The ratio is 40:1, the diameter of the screw is 75, the speed of the parallel twin-screw extruder is 100-400 rpm, and the temperature of the twin-screw extruder from the conveying section to the outlet is 190-210°C. The second stage is a single-screw extruder, the length-to-diameter ratio of the extruder is 15:1, the screw diameter is 150, the speed of the single-screw extruder is 25-50 rpm, the temperature of the extruder from the conveying section to the die It is granulated by reactive extrusion at 150-190°C to ...

Embodiment 2

[0030] Example 2 Preparation of High Melt Strength Polypropylene Resin

[0031]

[0032] Its preparation method is with embodiment one.

Embodiment 3

[0033] Preparation of Example Three High Melt Strength Polypropylene Resin

[0034] Change homopolypropylene into a mixture of homopolypropylene and copolymerized polypropylene, homopolypropylene accounts for 1-99% in the mixture, and the preparation method is the same as that of Example 1.

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Abstract

The invention discloses an expandable high-melt-strength polypropylene resin and a preparation method thereof. The method comprises: reacting and extruding raw materials including polypropylene, ultrahigh molecular weight polyethylene, petroleum resin, hyperoxide, bis[gamma-(triethoxysilyl)propyl]tetrasulfide, zinc oxide, stearic acid and the like in a parallel double screw extruder to obtain high-melt-strength polypropylene; and mixing the high-melt-strength polypropylene with liquid paraffin and azodicarbonamide at a high speed to obtain the expandable high-melt-strength polypropylene resin. The method disclosed by the invention is simple, low in investment and environment-friendly, and the extrusion performance of the melt is high.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polypropylene resin with expandability and high melt strength and a preparation method thereof. Background technique [0002] As a thermoplastic synthetic resin, polypropylene has the characteristics of easy synthesis, low density, non-toxicity, good heat resistance, high rigidity and excellent electrical insulation. It is widely used in industries such as automobiles, home appliances, packaging and building materials. However, since polypropylene is a crystalline polymer, when the processing temperature is near its melting point, its melt strength decreases rapidly, which leads to the disadvantages of low melt strength and poor sag resistance, resulting in its thermal forming. The wall thickness of the container is not uniform, the edges curl and shrink during extrusion coating and calendering, and the cells collapse during extrusion and foaming. Therefo...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/14C08L57/02C08L23/06C08J9/16C08J9/10C08K13/02C08K5/14C08K5/548B29C47/92B29C48/92
CPCB29C48/40
Inventor 胡圣飞陈长青欧小波张冲
Owner WUHAN VIRENTIA ADVANCED MATERIAL
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