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Polypropylene composite material with low after shrinkage, high modulus and high impact resistance and preparation method thereof

A composite material and post-shrinking technology, applied in the field of polypropylene composite materials, can solve the problems of difficulty in the design, production and installation of injection molds, decreased material toughness or rigidity, affecting installation and use, etc. The effect of shrinkage reduction and post-shrinkage reduction

Inactive Publication Date: 2014-04-16
ZHEJIANG PRET NEW MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally speaking, polypropylene material has the disadvantage of large shrinkage rate. Unmodified polypropylene material will shrink by about 1.8-2.0% within 24-48 hours after injection molding, and will continue to shrink by about 0.2-0.3% after heat treatment. It brings great difficulties to the mold design and actual production and installation process of injection molded parts
In order to reduce the shrinkage of polypropylene materials, it is usually achieved by adding inorganic minerals and elastomer tougheners, but the result is a sharp drop in the toughness or rigidity of the material. In order to meet the rigidity requirements of automotive parts at the same time Requirements for toughness and balance, it is difficult to meet the target requirements simply by adding fillers or elastomers
However, the traditional reinforced and toughened modified polypropylene, even if the shrinkage rate meets the design requirements, will still have obvious post-shrinkage after heat treatment, so that the size of parts that originally meet the size requirements will be significantly smaller after baking or flame treatment , thus seriously affecting the subsequent installation and use

Method used

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  • Polypropylene composite material with low after shrinkage, high modulus and high impact resistance and preparation method thereof
  • Polypropylene composite material with low after shrinkage, high modulus and high impact resistance and preparation method thereof
  • Polypropylene composite material with low after shrinkage, high modulus and high impact resistance and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] Weigh 79.5% of polypropylene, 10% of talcum powder, 10% of elastomer 2, 0.1% of Irganox1010, 0.1% of Igrafos168, and 0.3% of Negonox DSTP in a high-speed mixer for 5 minutes, then add Melting extrusion granulation in a twin-screw extruder, where 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, 210°C in the fourth zone, 220°C at the head, and the speed of the twin-screw extruder 400 rpm. After the particles are dried, they are injection molded on an injection molding machine to prepare samples.

Embodiment 2

[0033] Weigh 74.5% of polypropylene, 20% of talcum powder, 5% of elastomer 2, 0.1% of Irganox1010, 0.1% of Igrafos168, and 0.3% of Negonox DSTP in a high-speed mixer for 5 minutes, then add Melting extrusion granulation in a twin-screw extruder, where 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, 210°C in the fourth zone, 220°C at the head, and the speed of the twin-screw extruder 400 rpm. After the particles are dried, they are injection molded on an injection molding machine to prepare samples.

Embodiment 3

[0035] Weigh 69.5% of polypropylene, 20% of talc, 10% of elastomer 2, 0.1% of Irganox1010, 0.1% of Igrafos168, and 0.3% of Negonox DSTP in a high-speed mixer for 5 minutes, then add Melting extrusion granulation in a twin-screw extruder, where 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, 210°C in the fourth zone, 220°C at the head, and the speed of the twin-screw extruder 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 a polypropylene composite material with low after shrinkage, a high modulus and high impact resistance, which consists of the following raw materials in percentage by weight: 50 to 80 percent of polypropylene, 10 to 30 percent of inorganic filler, 5 to 25 percent of an elastomer toughening agent, 0 to 1 percent of a nucleating agent, 0.1 to 2 percent of a stabilizer and 0 to 5 percent of other additives. The polypropylene composite material has the advantages as follows: 1, an ethylene-butylene copolymer is used as the elastomer toughening agent, so that compared with conventional toughened and modified polypropylene, the polypropylene composite material has obviously reduced after shrinkage and has higher size stability; 2, the nucleating agent is used as a crystallization promoter agent of the material, so that after shrinkage of the polypropylene material can be further reduced and size stability can be further improved; 3, the ethylene-butylene copolymer is used as the elastomer toughening agent, so that compared with the conventional toughened and modified polypropylen, the polypropylene composite material has higher low-temperature toughness.

Description

technical field [0001] The invention relates to a polypropylene composite material, in particular to a polypropylene composite material with low aftershrinkage, high modulus and high impact resistance, and a preparation method thereof; it belongs to the field of polymer modification and processing. Background technique [0002] The automobile and related industries have developed rapidly in recent years, and the demand for plastics for various parts has increased sharply, among which the amount of polypropylene composite materials has gradually accounted for an increasing proportion. For automotive interior and exterior trim parts, the precision of parts processing and assembly is getting higher and higher, and the tolerance rate of sample size is getting lower and lower. It has sufficient dimensional stability, so that the parts can still meet the installation requirements after long-term transportation and storage; in addition, many parts have subsequent processing process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L53/00C08L23/08C08K13/02C08K3/34C08K5/523B29C47/92B29C48/92
CPCB29B9/06B29C48/92B29C2948/9258B29C2948/92704C08K2201/003C08L23/12C08L53/00C08L2205/24C08L23/0815C08K13/02C08K3/34C08K5/523B29C48/04B29C48/40B29C48/875B29C2948/9259B29C2948/92885B29C2948/92895B29C2948/92904
Inventor 张锴张鹰张祥福周文
Owner ZHEJIANG PRET NEW MATERIALS
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