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High melt strength polypropylene and preparation thereof

A technology with high melt strength and melt strength, applied in the field of high melt strength polypropylene and its preparation, can solve the problem that it is difficult to control only the formation of long chain branching

Active Publication Date: 2009-08-12
宁波帕斯卡新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is difficult to control the formation of long-chain branching without forming a cross-linked network structure.

Method used

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  • High melt strength polypropylene and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The parts by mass of each component are:

[0088] Polypropylene (MFR=4.50g / 10min) 99,

[0089] Dicumyl peroxide 0.5,

[0090] Tetraethylthiuram dithioester 0.5,

[0091] In a twin-screw extruder with L / D=60, D=35mm, the feed rate is 10kg / h, and the speed is 100rpm. The temperature setting is divided into three sections, the conveying section is 160°C, the reaction section is 200°C, and the extrusion section is 190°C ℃. The melt strength of the resulting polypropylene was 305.8 mN and the melt index was 2.10 g / 10 min.

Embodiment 2

[0093] The parts by mass of each component are:

[0094] Polypropylene (MFR=4.50g / 10min) 99.4,

[0095] Dicumyl peroxide 0.5,

[0096] Tetraethylthiuram dithioester 0.1,

[0097] In a twin-screw extruder with L / D=60, D=35mm, the feed rate is 10kg / h, and the speed is 100rpm. The temperature setting is divided into three sections, the conveying section is 160°C, the reaction section is 200°C, and the extrusion section is 190°C ℃. The resulting polypropylene had a melt strength of 258.4 mN and a melt index of 2.64 g / 10 min.

Embodiment 3

[0099] The parts by mass of each component are:

[0100] Polypropylene (MFR=4.50g / 10min) 98.9,

[0101] Dicumyl peroxide 1,

[0102] Tetraethylthiuram dithioester 0.1,

[0103] In a twin-screw extruder with L / D=60, D=35mm, the feed rate is 10kg / h, and the speed is 100rpm. The temperature setting is divided into three sections, the conveying section is 160°C, the reaction section is 200°C, and the extrusion section is 190°C ℃. The resulting polypropylene had a melt strength of 275.6 mN and a melt index of 2.40 g / 10 min.

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Abstract

The invention provides a high-melt-strength polypropylene composition. The composition is made from the following compositions in parts by weight: 48-99.989 parts of polypropylene, 0.01-1 part of an initiator and 0.001-1 part of a branching accelerant. The high-melt-strength polypropylene composition can be made into high-melt-strength polypropylene with satisfactory overall properties including satisfactory melt strength without adding polyfunctional monomers.

Description

technical field [0001] The invention relates to a high melt strength polypropylene and a preparation method thereof. Background technique [0002] As one of the five general-purpose plastics, polypropylene has the characteristics of high melting point, good heat resistance, low density, weather resistance, excellent mechanical properties and good chemical stability, and is widely used in packaging materials, mechanical parts, household appliances, synthetic fibers and other fields. However, due to the linear structure of the molecular chain of conventional polypropylene, its melt strength drops sharply after the temperature is higher than the melting point, which directly causes some defects in the melt processing of polypropylene, such as uneven wall thickness during thermoforming, extrusion Edge curling occurs during coating and calendering, and it is difficult to blow film and prepare foamed products, which greatly limits its application range. [0003] High melt streng...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08K5/40C08K5/47C08K5/44C08K5/31C08K5/39C08K5/405C08K5/51C08K5/36C08K5/14C08K5/23B29B7/28B29C47/38B29C47/92B29C48/395B29C48/92
CPCB29C47/0004B29C48/022
Inventor 杨桂生杜立波解廷秀
Owner 宁波帕斯卡新材料有限公司
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