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Injection molding grade polypropylene microcellular foam composite material and preparation method thereof

A composite material and a technology of microcellular foaming are applied in the fields of polypropylene microcellular foamed composite materials, injection-grade polypropylene microcellular foamed composite materials and their preparation, which can solve the problem that the cell walls are easily broken, it is difficult to form a cell structure, Cell collapse and other problems, to avoid bad odor, improve cell structure, improve melt strength and foam performance.

Active Publication Date: 2016-04-20
SHANGHAI PRET COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary PP is a linear crystalline polymer, and its viscosity drops rapidly after melting, especially the extensional viscosity. At the same time, a large amount of crystallization heat is released during the crystallization process, which further reduces the viscosity and strength of PP melt, causing PP foaming When the cell wall is easily broken, the gas in the cell will quickly escape out of the polymer matrix, causing the cell to collapse, making it difficult to form an excellent cell structure

Method used

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  • Injection molding grade polypropylene microcellular foam composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 61.4 parts of conventional polypropylene, 2 parts of slightly cross-linked polypropylene, 4 parts of high-density polyethylene, 20 parts of 10000 mesh talc filler, 12 parts of toughening agent POE, 0.15 parts of antioxidant 3114, 0.15 parts of DSTP and 0.3 parts Put 168 into a high-speed mixer and mix for 2 to 5 minutes. After mixing evenly, put the mixture into a twin-screw extruder for melt extrusion and granulation. 210~220°C, 210~220°C for the third zone, 210~220°C for the fourth zone, 215~225°C for the fifth zone, 215~225°C for the sixth zone, 215~225°C for the seventh zone, 210~220°C for the head, pressure 12 ~18MPa, the material stays in the extruder for 1~2min. In this way, a polypropylene composite material with high melt strength is obtained.

[0034] After mixing 98 parts of polypropylene composite material and 2 parts of composite foaming agent evenly, adopt the secondary mold opening technology, and perform microporous injection foaming molding by the inje...

Embodiment 2

[0036] 59.4 parts of conventional polypropylene, 4 parts of slightly cross-linked polypropylene, 4 parts of high-density polyethylene, 20 parts of 10000 mesh talc filler, 12 parts of toughening agent POE, 0.15 parts of antioxidant 3114, 0.15 parts of DSTP and 0.3 parts Put 168 into a high-speed mixer and mix for 2 to 5 minutes. After mixing evenly, put the mixture into a twin-screw extruder for melt extrusion and granulation. 210~220°C, 210~220°C for the third zone, 210~220°C for the fourth zone, 215~225°C for the fifth zone, 215~225°C for the sixth zone, 215~225°C for the seventh zone, 210~220°C for the head, pressure 12 ~18MPa, the material stays in the extruder for 1~2min. In this way, a polypropylene composite material with high melt strength is obtained.

[0037] After mixing 98 parts of polypropylene composite material and 2 parts of composite foaming agent evenly, adopt the secondary mold opening technology, and perform microporous injection foaming molding by the inje...

Embodiment 3

[0039] 57.4 parts of conventional polypropylene, 6 parts of slightly cross-linked polypropylene, 4 parts of high-density polyethylene, 20 parts of 10000 mesh talc filler, 12 parts of toughening agent POE, 0.15 parts of antioxidant 3114, 0.15 parts of DSTP and 0.3 parts Put 168 into a high-speed mixer and mix for 2 to 5 minutes. After mixing evenly, put the mixture into a twin-screw extruder for melt extrusion and granulation. 210~220°C, 210~220°C for the third zone, 210~220°C for the fourth zone, 215~225°C for the fifth zone, 215~225°C for the sixth zone, 215~225°C for the seventh zone, 210~220°C for the head, pressure 12 ~18MPa, the material stays in the extruder for 1~2min. In this way, a polypropylene composite material with high melt strength is obtained.

[0040]After mixing 98 parts of polypropylene composite material and 2 parts of composite foaming agent evenly, adopt the secondary mold opening technology, and perform microporous injection foaming molding by the injec...

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Abstract

The invention discloses an injection molding grade polypropylene microcellular foam composite material and a preparation method thereof. The preparation method comprises the step of carrying out microcellular injection molding foaming with an injection molding machine after uniformly mixing 90-99.9wt% of polypropylene composite material with 0.1-10wt% of foaming agent, wherein the polypropylene composite material is prepared from the following raw materials by weight percent: 42-95% of conventional polypropylene, 0.1-15% of micro-crosslinked polypropylene, 0.1-10% of polyethylene, 0.1-25% of talcum powder filler, 0.1-15% of toughening agent, 0.1-5% of antioxidant and 0-3% of other aids; the foaming agent is modified sodium bicarbonate. The polypropylene composite material has higher melt strength. The polypropylene microcellular foam material prepared from the polypropylene composite material is fine and uniform in pores, well maintains the original mechanical properties of the materials and also takes modified sodium bicarbonate as the foaming agent, thus preventing the obtained product from producing unpleasant odor.

Description

technical field [0001] The present invention relates to an injection molding grade polypropylene microporous foam composite material and its preparation method. More specifically, the cell structure is improved by adding micro-crosslinked polypropylene and polyethylene, and the composite material of sodium bicarbonate and stearic acid is used. Foaming Agents to Suppress Odor in Polypropylene Microcellular Foam Composites. It can be used for automotive interior and exterior accessories, household appliances and packaging materials, and belongs to the technical field of polymer material processing and modification. Background technique [0002] Polypropylene (PP) has the advantages of good transparency, light weight, good heat resistance, low price, non-toxic, good corrosion resistance, excellent electrical insulation, good processability, etc. In addition, high crystallinity makes it yield It has excellent strength, tensile strength, surface hardness and modulus of elasticit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/06C08L23/08C08K13/02C08K3/34C08J9/08
CPCC08J9/08C08J2203/02C08J2323/12C08J2423/06C08L23/12C08L2205/025C08L2205/035C08L23/06C08L23/0815C08K13/02C08K3/34
Inventor 殷嘉兴赵丽萍张祥福周文
Owner SHANGHAI PRET COMPOSITES
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