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Method for increasing melt strength of polypropylene

A melt strength and polypropylene technology, applied in the field of improving the melt strength of polypropylene, to achieve the effect of reducing loss, reducing dosage, and promoting grafting reaction

Active Publication Date: 2009-12-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Akzo Nobel company (WO9749759, WO9927007) under nitrogen protection, with peroxydicarbonate compound as initiator, obtains long-chain branched polypropylene by reactive extrusion, but while obtaining high branched chain content, is accompanied by more gel structure

Method used

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  • Method for increasing melt strength of polypropylene
  • Method for increasing melt strength of polypropylene
  • Method for increasing melt strength of polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 (comparative example)

[0024] Add 100 parts by weight of polypropylene (homopolypropylene, powder, melt index 2.28g / 10min) into an internal mixer at 180°C and knead for 10 minutes to obtain a polypropylene with a melt strength of 2.5cN.

Embodiment 2

[0025] Embodiment 2 (comparative example)

[0026] Add 100 parts by weight of the polypropylene used in Example 1 into an internal mixer at 180° C., add 1 part by weight of TMPTMA after melting and plasticizing, and the mixing conditions are the same as in Example 1. The melt strength of the resulting polypropylene was 4 cN.

Embodiment 3

[0027] Embodiment 3 (comparative example)

[0028] Add 100 parts by weight of the polypropylene used in Example 1 into an internal mixer at 180°C, add 1 part by weight of TMPTMA after melting and plasticizing, and add 0.2 parts by weight of BPDH after mixing. The mixing conditions are the same as in Example 1, and the torque No change, discharge. The melt strength of the resulting polypropylene was 5.3 cN.

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Abstract

The present invention uses 100 parts by weight of polypropylene and 0.1-10 parts by weight of comonomer, 0.001-5 parts by weight of free radical reversible stabilizer and 0.001-2 parts by weight of free radical initiator to melt and mix the reaction to improve the polypropylene the melt strength. Wherein the free radical reversible stabilizer is a dithioformate compound. Under the reaction conditions, the dithioformic acid group produced by the free radical reversible stabilizer can stabilize the polypropylene macromolecular free radical through a reversible process, and as a result, it can effectively inhibit the chain scission of the polymer and promote the occurrence of grafting reaction. Another cracking product is carbon free radicals, which can activate polymer macromolecules to obtain macromolecular free radicals, thereby reducing the amount of free radical initiators.

Description

technical field [0001] The invention relates to a method for increasing the melt strength of polypropylene. Background technique [0002] As a thermoplastic polymer material with excellent performance, polypropylene (PP) has the characteristics of low density, non-toxicity, easy processing and molding, and excellent product comprehensive performance. It is widely used in automobiles, household appliances, electronics, packaging and building materials. , has become the fastest growing variety of general resins. Although PP has many advantages, due to the inherent characteristics of propylene coordination polymerization, propylene polymerization with Ziegler-Natta catalyst and metallocene catalyst mostly obtains PP with linear structure, and linear PP has low melt strength in molten state. When stretching and flowing, the melt cannot show the strain hardening effect, which directly causes some defects of PP during melt processing, including edge curling and shrinkage during h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02B29B7/28B29C47/92B29C47/40B29C48/40B29C48/92
CPCB29C47/92B29C48/92B29C2948/92704B29C48/40B29C2948/92561B29C2948/92895
Inventor 姜治伟唐涛张振江邱健
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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