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Method for preparing polypropylene melt with high melt strength

A high melt strength, polypropylene technology, applied in the polypropylene field, can solve the problems of poor compatibility, low polypropylene melt tensile properties, and the cross-linking reaction cannot be well solved, and achieves cross-linking reaction inhibition. , The effect of improving melt tensile properties and excellent melt ductility

Active Publication Date: 2011-08-31
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] However, the compatibility of grafted monomers with polypropylene resins is poor, and due to the high reactive polymerization activity of grafted monomers, their own homopolymerization and crosslinking reactions have not been well resolved.
Therefore, the tensile properties of this type of high melt strength polypropylene melt are low, and the polymer melt will break at a small draw ratio

Method used

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  • Method for preparing polypropylene melt with high melt strength
  • Method for preparing polypropylene melt with high melt strength
  • Method for preparing polypropylene melt with high melt strength

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[0032] The embodiment of the present invention discloses a method for preparing a high melt strength polypropylene melt, comprising:

[0033] The raw materials are melt mixed and reacted to produce a high melt strength polypropylene melt, wherein the raw materials include:

[0034] 100 parts by weight of polypropylene;

[0035] 0.5 to 5 parts by weight of diolefins;

[0036] 0.01 to 10 parts by weight of grafted monomers;

[0037] 0.01-3 parts by weight of initiator.

[0038] The grafting monomer preferably includes acrylate and / or other compounds with poor compatibility with polypropylene resin;

[0039] The acrylate preferably includes one or more of monoacrylate, diacrylate, triacrylate and tetraacrylate;

[0040] The monoacrylate preferably comprises one of octyl (meth)acrylate, isooctyl (meth)acrylate, glycidyl (meth)acrylate, 2-ethylhexyl acrylate and allyl acrylate or several;

[0041] The diacrylate preferably comprises one or more of triethylene glycol dimethacr...

Embodiment 1

[0082] 100 parts by weight of polypropylene (homopolypropylene, powder, melt index is 2.2g / 10min), 0.01 parts by weight of trimethylolpropane trimethacrylate, 1.99 parts by weight of isoprene, 0.3 Parts by weight of TBPB and 0.2 parts by weight of antioxidant B215 were evenly mixed and added to an internal mixer at 180°C, kneaded for 10 minutes, and discharged when the torque remained constant to obtain high melt strength polypropylene.

Embodiment 2

[0084] 80 parts by weight of polypropylene (homopolypropylene, powder, melt index 1.5g / 10min), 20 parts by weight of polypropylene (homopolypropylene, powder, melt index 2.2g / 10min), 0.5 parts by weight Parts of trimethylolpropane trimethacrylate, 3.5 parts by weight of piperylene, 0.5 parts by weight of TBPB, 0.2 parts by weight of antioxidant B215, uniformly mixed and added to the twin-screw extruder, wherein extruded The four-stage temperature of the machine from the feed port to the discharge port is 190 ° C, 200 ° C, 180 ° C and 230 ° C respectively, and it is reacted and extruded in a molten state. The reaction time is 3 minutes, and high melt strength polypropylene is produced.

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Abstract

The embodiment of the invention discloses a method for preparing polypropylene melt with high melt strength, which uses alkadiene as a modified monomer, thus improving the tensile property of the polypropylene melt with high melt strength due to good compatibility of the alkadiene and polypropylene resin. In addition, the alkadiene monomers can perform grafting reaction with the polypropylene melt, and the alkadiene monomer has lower activity, thus inhibiting cross-linkage reaction so as to expedite the grafting reaction in a certain degree and ensure polypropylene to have higher melt strength. Therefore, the polypropylene melt with high melt strength prepared by the method provided by the invention not only has higher melt strength, but also has larger draw ratio and excellent melt ductility.

Description

technical field [0001] The invention relates to the technical field of polypropylene, in particular to a method for preparing a high-melt-strength polypropylene melt. Background technique [0002] Polypropylene has the characteristics of low density, non-toxic, easy to process and shape, and excellent product comprehensive performance. It has been widely used in automobiles, household appliances, electronics, packaging, and building materials. It is the most promising thermoplastic polymer material today. one. [0003] Due to the inherent characteristics of the propylene coordination polymerization reaction, most of the propylene polymerization obtains linear structure polypropylene. The softening point of the linear structure polypropylene is very close to the melting point. After the melting point is exceeded, the melt strength decreases rapidly, resulting in the sag resistance of polypropylene. Poor; at the same time, the melt cannot exhibit a strain hardening effect dur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02C08F236/02B29C47/92B29C48/40B29C48/92
CPCB29C48/92B29C2948/92704B29C48/04B29C48/40B29C48/9185B29C2948/92895
Inventor 唐涛邢海平姜治伟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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