A kind of polypropylene composition and preparation method thereof

Abstract

The invention discloses a polypropylene composition which comprises, by weight parts, 100 parts of polypropylene, 10-30 parts of basic magnesium sulfate whisker, 0.1-1.0 part of foaming agent, 0.5-1.5 parts of smell adsorbent and 10-30 parts of flexibilizer. By simultaneously adding basic magnesium sulfate whisker and foaming agent of a specific content, compared with the situation that only basic magnesium sulfate whisker is added, the weight of a workpiece can be greatly reduced while the comprehensive mechanical property is not reduced, and thus the lightweight requirements of an automobile are met. By adding the smell adsorbent of a specific content and adopting single vacuum design of a twin-screw extruder, it is guaranteed that the vacuum degree requirements are not larger than -0.08 bar, micromolecular volatile matter can be pumped away, and the devolatilization effect is improved obviously. The prepared polypropylene composition is low in smell and emission characteristics, the lightweight requirements of the automobile and low-smell low-emission performances of automobile interior part materials can be met, and the application prospect is wide.

Description

technical field

[0001] The invention relates to the field of polymer material modification, in particular to a polypropylene composition and a preparation method thereof. Background technique

[0002] Polypropylene (PP) is one of the five general-purpose plastics and has been widely used in chemical, construction, light industry, automobile, home appliances, packaging and other industrial sectors. However, with the development of the industry, the requirements for material properties are getting higher and higher. Ordinary polypropylene must be modified to give it high performance in order to meet the needs.

[0003] At present, in the modified polypropylene industry, the mainstream of reinforced polypropylene composite materials is to use talcum powder to fill polypropylene modified composite materials. This kind of talc powder filled modified polypropylene composite can be widely used in automotive interior and exterior trim parts, such as: instrument panel , center conso...

Examples

Embodiment 1-9 and comparative example 1-10

[0073] Embodiment 1-9 and comparative example 1-10: the preparation of polypropylene composition

[0074] According to the formula in Table 1, first weigh polypropylene, toughening agent, foaming agent, odor adsorbent and processing aids and add them to the high-speed mixer and mix for 3-5 minutes, wherein the speed of the high-speed mixer is 200 rpm- 300 rpm; then weigh basic magnesium sulfate whiskers and add them to a high-speed mixer for 3-5 minutes, wherein the speed of the high-speed mixer is 200 rpm-300 rpm; add the above-mentioned mixed materials Melt extrusion, granulation, drying, cooling, and packaging in twin-screw extruder to get ready; among them, the twin-screw extruder is designed for single vacuum (that is, a vacuum pump is installed in the 9th zone), and the vacuum degree is required to be ≤ -0.08bar, the temperature of the twin-screw extruder is 170°C, 200°C, 200°C, 210°C, 210°C, 205°C, 205°C, 205°C, 200°C, 200°C from the feeding section to the machine head ...

technical field

[0001] The invention relates to the field of polymer material modification, in particular to a polypropylene composition and a preparation method thereof. Background technique

[0002] Polypropylene (PP) is one of the five general-purpose plastics and has been widely used in chemical, construction, light industry, automobile, home appliances, packaging and other industrial sectors. However, with the development of the industry, the requirements for material properties are getting higher and higher. Ordinary polypropylene must be modified to give it high performance in order to meet the needs.

[0003] At present, in the modified polypropylene industry, the mainstream of reinforced polypropylene composite materials is to use talcum powder to fill polypropylene modified composite materials. This kind of talc powder filled modified polypropylene composite can be widely used in automotive interior and exterior trim parts, such as: instrument panel , center conso...

Examples

Embodiment 1-9 and comparative example 1-10

[0073] Embodiment 1-9 and comparative example 1-10: the preparation of polypropylene composition

[0074] According to the formula in Table 1, first weigh polypropylene, toughening agent, foaming agent, odor adsorbent and processing aids and add them to the high-speed mixer and mix for 3-5 minutes, wherein the speed of the high-speed mixer is 200 rpm- 300 rpm; then weigh basic magnesium sulfate whiskers and add them to a high-speed mixer for 3-5 minutes, wherein the speed of the high-speed mixer is 200 rpm-300 rpm; add the above-mentioned mixed materials Melt extrusion, granulation, drying, cooling, and packaging in twin-screw extruder to get ready; among them, the twin-screw extruder is designed for single vacuum (that is, a vacuum pump is installed in the 9th zone), and the vacuum degree is required to be ≤ -0.08bar, the temperature of the twin-screw extruder is 170°C, 200°C, 200°C, 210°C, 210°C, 205°C, 205°C, 205°C, 200°C, 200°C from the feeding section to the machine head ...

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