Injection molding-grade high-performance polypropylene composite material with good appearance and preparation method of injection molding-grade high-performance polypropylene composite material

A technology of composite materials and polypropylene, which is applied in the field of injection-molded high-performance polypropylene composite materials and polypropylene composite materials, can solve the problems of increased cost, long injection molding process, and prone to tiger skin patterns, etc., to achieve improved molecular weight distribution, excellent Effects of improving mechanical properties and appearance of injection molding

Inactive Publication Date: 2015-04-29
SHANGHAI PRET COMPOSITES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For some large injection molded parts, because of the long injection molding process, it is easy to have bad appearances such as tiger skin patterns, radial patterns, and air marks. Although the change or modification of the mold gate can effectively improve the above-mentioned bad phenomena, but more often This kind of change will face huge pressure on cost and cycle and it is difficult to realize. In this case, the appearance of parts can only be improved by adjusting the modified polypropylene material itself.
[0003] In general, there are many solutions to improve injection molding defects such as tiger skin patterns through material adjustment, including improving material melting index, reducing elastomer content, using special processing aids, etc., but these methods generally lose the comprehensiveness of materials at the cost of performance
Some domestic and foreign patents (US2012157599A, CN201010256870.7) use some special elastomers or polyolefin resins as improvers, and also obtain better appearance effects, but often bring obvious cost increases, and the production capacity of the resins used is very high. Limited, unable to cope with the huge demand in the domestic market
There are also studies that use polypropylene with a wide molecular weight distribution as the matrix to improve the processing effect, but a single polypropylene with a wide molecular weight distribution often means the existence of a large number of low molecular chains, which has a fatal impact on the odor and emission characteristics of injection molded parts

Method used

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  • Injection molding-grade high-performance polypropylene composite material with good appearance and preparation method of injection molding-grade high-performance polypropylene composite material
  • Injection molding-grade high-performance polypropylene composite material with good appearance and preparation method of injection molding-grade high-performance polypropylene composite material
  • Injection molding-grade high-performance polypropylene composite material with good appearance and preparation method of injection molding-grade high-performance polypropylene composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take by weight percentage polypropylene (A) 69.5%, polypropylene (B) 15%, inorganic filler 10%, elastomer 5%, Irganox 1010 is 0.1%, Igrafos 168 is 0.1%, Negonox DSTP is 0.3%, in Dry mix in a high-speed mixer for 5 minutes, then add to a twin-screw extruder to melt and extrude to granulate. The temperature inside the screw barrel is: 200°C in the first zone, 210°C in the second zone, 210°C in the third zone, and 210°C in the fourth zone. The temperature of the head is 220°C, and the rotational speed of the twin-screw extruder is 400 rpm. After the particles are dried, they are injection molded on an injection molding machine to prepare samples.

Embodiment 2

[0033] Take by weight percentage polypropylene (A) 64.5%, polypropylene (B) 15%, inorganic filler 10%, elastomer 10%, Irganox 1010 is 0.1%, Igrafos 168 is 0.1%, Negonox DSTP is 0.3%, in Dry mix in a high-speed mixer for 5 minutes, then add to a twin-screw extruder to melt and extrude to granulate. The temperature inside the screw barrel is: 200°C in the first zone, 210°C in the second zone, 210°C in the third zone, and 210°C in the fourth zone. The temperature of the head is 220°C, and the rotational speed of the twin-screw extruder is 400 rpm. After the particles are dried, they are injection molded on an injection molding machine to prepare samples.

Embodiment 3

[0035] Take by weight percentage polypropylene (A) 59.5%, polypropylene (B) 15%, inorganic filler 10%, elastomer 15%, Irganox 1010 is 0.1%, Igrafos 168 is 0.1%, Negonox DSTP is 0.3%, in Dry mix in a high-speed mixer for 5 minutes, then add to a twin-screw extruder to melt and extrude to granulate. The temperature inside the screw barrel is: 200°C in the first zone, 210°C in the second zone, 210°C in the third zone, and 210°C in the fourth zone. The temperature of the head is 220°C, and the rotational speed of the twin-screw extruder is 400 rpm. After the particles are dried, they are injection molded on an injection molding machine to prepare samples.

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Abstract

The invention discloses an injection molding-grade high-performance polypropylene composite material with a good appearance and a preparation method of the injection molding-grade high-performance polypropylene composite material. The polypropylene composite material comprises the following raw materials in percent by weight: 25-69 percent of polypropylene (A), 15-30 percent of polypropylene (B), 10-30 percent of an inorganic filler, 5-15 percent of an elastomer flexibilizer, 0.1-2 percent of a stabilizer, and 0-5 percent of other additives. The polypropylene composite material and the preparation method have the advantages that 1, the molecular weight distribution of a PP matrix is improved to achieve the effect of improving the appearance of the injection molded polypropylene composite material through synergistic effect of polypropylene resin with high molecular weight and polypropylene resin with low molecular weight; 2, the original optimum proportion of the inorganic filler to the elastomer flexibilizer is not changed, and an excellent mechanical property is still kept while the injection molded polypropylene composite material has a good appearance; 3, the component kinds of an original modified material are not changed, the material performance is not influenced, and at the same time, the cost is not remarkably increased.

Description

technical field [0001] The invention relates to a polypropylene composite material, in particular to an injection-molded high-performance polypropylene composite material with good appearance, and a preparation method thereof; belonging to the field of polymer modification and processing. Background technique [0002] With the year-by-year growth of industries such as automobiles and home appliances, the demand for plastic parts mainly made of modified polypropylene has increased sharply. For some large injection molded parts, because of the long injection molding process, it is easy to have bad appearances such as tiger skin patterns, radial patterns, and air marks. Although the change or modification of the mold gate can effectively improve the above-mentioned bad phenomena, but more often This kind of change will face huge pressure on cost and cycle and it is difficult to realize. In this case, the appearance of parts can only be improved by adjusting the modified polypro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L53/00C08L9/00C08L23/16C08L23/08C08K13/02C08K3/26C08K3/30C08K3/36C08K3/22C08K3/34B29B9/06B29C47/92B29C48/92
CPCC08L53/00B29B9/06B29C48/92C08K2201/003C08L2205/025C08L2205/03C08L23/0815C08K13/02C08K3/346C08K5/1345C08K5/526
Inventor 张锴张鹰张祥福周文俞恒杰
Owner SHANGHAI PRET COMPOSITES
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