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High melt strength polypropylene blend and method of preparing same

A technology of high melt strength and polypropylene, which is applied in the field of polypropylene blends, can solve the problem that it is difficult to control only the formation of long-chain branching, and achieve the effects of inhibiting β-fracture reaction, good rheological properties, and simple process

Inactive Publication Date: 2009-07-01
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The parts by weight of each component are:

[0031] Polypropylene (MFR=4.50g / 10min) 98.99,

[0032] Calcium carbonate 0.01,

[0033] Dicumyl peroxide 0.5,

[0034] Tetraethylthiuram dithioester 0.5.

[0035] In a twin-screw extruder with L / D=60 and D=35mm, the feed rate is 10kg / h, and the rotation 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

[0037] The parts by weight of each component are:

[0038] Polypropylene (MFR=4.50g / 10min) 69,

[0039] Talc powder 30,

[0040] Dicumyl peroxide 0.5,

[0041] Tetraethylthiuram dithioester 0.5.

[0042] In a twin-screw extruder with L / D=60 and D=35mm, the feed rate is 10kg / h, and the rotation 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 obtained polypropylene was 328.7 mN and the melt index was 2.08 g / 10 min.

Embodiment 3

[0044] The parts by weight of each component are:

[0045] Polypropylene (MFR=4.50g / 10min) 39,

[0046] Talc 60

[0047] Dicumyl peroxide 0.5,

[0048] Tetraethylthiuram dithioester 0.5.

[0049] 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 344.9 mN and a melt index of 2.01 g / 10 min.

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Abstract

The invention relates to a product. The product is prepared by the following steps: mixing 18 to 99.979 weight portions of polypropylene, 0.01 to 80 weight portions of filler, 0.01 to 1 weight portion of initiator, and 0.001 to 1 weight portion of branching promoter; and carrying out the reaction of the mixed raw materials in a Banbury mixer or a screw extruder at the reaction temperature of between 140 and 250 DEG C. Compared with the prior art, the obtained branched high bath strength polypropylene co-mixture has a simple process and good product processing rheological performance.

Description

technical field [0001] The invention relates to a polypropylene blend, in particular to a high melt strength polypropylene blend 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...

Claims

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Application Information

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IPC IPC(8): C08L23/10C08K5/47B29C47/38C08K3/34C08K5/14C08K5/23
Inventor 杨桂生杜立波解廷秀
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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