Polypropylene composition for injection molding of automotive part with good appearance and preparation method thereof

A polypropylene composition and composition technology, which is applied in the field of polypropylene compositions, can solve the problems of lack of clear description, low-temperature impact performance and rigidity are not well balanced, and achieve the effect of improving appearance, good low-temperature performance and rigidity

Active Publication Date: 2010-12-15
CHENGDU KINGFA SCI & TECH ADVANCED MATERIALS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not a good balance of low temperature impact performance and stiffness
In addition, the tiger skin pattern produced by adding ethylene-octene copolyme

Method used

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  • Polypropylene composition for injection molding of automotive part with good appearance and preparation method thereof
  • Polypropylene composition for injection molding of automotive part with good appearance and preparation method thereof
  • Polypropylene composition for injection molding of automotive part with good appearance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The composition of the polypropylene composition of this embodiment is shown in Table 2.

[0041] Raw material and consumption of table 2 polypropylene composition

[0042]

[0043] The polypropylene composition of the present embodiment, its preparation method is as follows:

[0044] The raw materials described in Table 2 are weighed according to their dosage ratios. After mixing evenly, add them to a twin-screw extruder, melt and knead at a temperature of 190-210°C, extrude and granulate, water-cool and air-dry, and the particle size is 3mm. Just pack it.

[0045] The detection results of the polypropylene composition of this embodiment are shown in Table 3.

[0046] Table 3 product performance test results

[0047] performance

[0048] Notched Izod Impact Strength -30°C

[0049] In this embodiment, ethylene-propylene block copolymer is added, and its appearance performance is better, and there is no tiger skin pattern on the surface of the wor...

Embodiment 2

[0051] The composition of the polypropylene composition of this embodiment is shown in Table 4.

[0052] Raw material and consumption of table 4 polypropylene composition

[0053]

[0054] The polypropylene composition of this embodiment, its preparation method is as embodiment 1.

[0055] The detection results of the polypropylene composition of this embodiment are shown in Table 5.

[0056] Table 5 product performance test results

[0057] performance

[0058] Appearance evaluation

Embodiment 3

[0060] The composition of the polypropylene composition of this embodiment is shown in Table 6.

[0061] Raw material and consumption of table 6 polypropylene composition

[0062]

[0063] The polypropylene composition of this embodiment, its preparation method is as embodiment 1.

[0064] The detection results of the polypropylene composition of this embodiment are shown in Table 7.

[0065] Table 7 product performance test results

[0066] performance

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Abstract

The invention discloses a polypropylene composition for the injection molding of an automotive part with a good appearance and a preparation method thereof. The composition comprises the following components in percentage by weight: 50 to 78 percent of polypropylene resin, 2 to 20 percent of elastomer, 2 to 10 percent of ethylene-propylene block copolymer and the balance of assistant. The automotive part prepared by the polypropylene composition meets use requirements in terms of all properties, avoids a tiger skin appearance defect and has high low-temperature performance and rigidity. The high difference between the melting viscosity of the elastomer and the melting viscosity of the polypropylene makes the elastomer fail to disperse in the polypropylene desirably, so the dispersion particle size of the elastomer in the polypropylene is large, the rigidity is lowered, and the injection molded part has a tiger skin. However, by adding the ethylene-propylene block copolymer, the dispersion of the elastomer in the polypropylene and the phase interface strength of the elastomer and the polypropylene substrate are improved, so the appearance of the part is enhanced.

Description

technical field [0001] The present invention relates to a polypropylene composition, in particular to a polypropylene composition for injection molding automobile parts with good appearance. Background technique [0002] Due to its light weight, solvent resistance, easy processing, excellent mechanical properties, and easy recycling, polypropylene has been widely used, especially in the automotive industry, home appliances and machinery. In the future, the automobile industry will develop in the direction of energy saving, environmental protection and safety. This requires the materials used to be light in weight, simple to process, easy to recycle, etc., and polypropylene meets these requirements. However, polypropylene material has poor low-temperature resistance and low rigidity, which cannot meet the requirements for automotive parts. It must be modified to improve its low-temperature impact performance and rigidity to meet the requirements and standards of automotive p...

Claims

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Application Information

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IPC IPC(8): C08L23/14C08L23/08C08L53/00C08K3/34B29C47/92B29C48/92
CPCB29C48/04B29C48/92B29C2948/92704B29C2948/92895
Inventor 李永华杨波杨燕罗忠富宁凯军叶南飚王灿耀袁绍彦
Owner CHENGDU KINGFA SCI & TECH ADVANCED MATERIALS CO LTD
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