Low-frequency sound-absorbing polypropylene composition as well as preparation method and application thereof
A polypropylene composition and polypropylene technology, applied in the field of polymer materials, can solve the problems of high density and low-frequency sound absorption, and achieve the effects of low density, improved sound absorption performance, and reduced noise
Pending Publication Date: 2022-05-13
TIANJIN KINGFA NEW MATERIAL
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Problems solved by technology
[0006]
In order to overcome the defects of too high density and low-frequency sound absorption described in the above-mentioned prior art, the present invention provides a low-frequency sound-absorbing polypropylene composition. By screening specific types of polypropylene resins and filling them with low-content talcum powder, the present invention obtains A polypropylene composition with excellent low-frequency sound-absorbing effect, and the density of the polypropylene composition is ≤1.0g / cm
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Embodiment 1～20
[0051] Embodiments 1-20 respectively provide a polypropylene composition, the component contents are shown in Table 1, and the preparation method is as follows:
[0052] Mix the components according to Table 1, add to a twin-screw extruder, melt and mix, extrude and granulate to obtain a polypropylene composition;
[0053] The extrusion process of the twin-screw extruder is as follows: the temperature of the first zone is 80-120°C, the temperature of the second zone is 190-210°C, the temperature of the third zone is 210-230°C, the temperature of the fourth zone is 210-230°C, and the temperature of the fifth zone is 210-230°C ℃, the temperature in the sixth zone is 210-230 ℃, the temperature in the seventh zone is 210-230 ℃, the temperature in the eighth zone is 210-230 ℃, the temperature in the ninth zone is 210-230 ℃, the speed of the main engine is 250-600rpm; the aspect ratio of the twin-screw extruder is 40:1.
[0054] The component content (parts by weight) of the polypr...
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Abstract
The invention discloses a low-frequency sound-absorbing polypropylene composition as well as a preparation method and application thereof. The low-frequency sound-absorbing polypropylene composition is prepared from the following components in parts by weight: 70 to 85 parts of polypropylene, 10 to 20 parts of elastomer and 5 to 10 parts of talcum powder, the ratio of the 998 cm <-1 > peak area to the 973 cm <-1 > peak area of the polypropylene after annealing at 120 DEG C / 0.5 h is 0.94-0.98; and the molecular weight distribution index of the polypropylene is 2-8. The appropriate PP resin is screened and has a synergistic effect with the elastomer and the talcum powder, so that the damping performance of the polypropylene composition is changed, and the effect of resonance sound absorption can be achieved under the frequency resonance of 200-400 Hz, so that the sound absorption performance of the material is effectively improved, and the noise is reduced.
Description
technical field [0001] The invention relates to the technical field of polymer materials, and more specifically, relates to a low-frequency sound-absorbing polypropylene composition and a preparation method and application thereof. Background technique [0002] Polypropylene (PP) is widely used and has become one of the fastest-growing general-purpose plastics due to its low price, easy processing, low density, chemical corrosion resistance, and excellent physical and mechanical properties. In the automobile industry, modified polypropylene is mainly used in automobile bumpers, door trim panels, instrument panel frames, etc. [0003] There will be a lot of noise when the car is running, especially low-frequency noise (frequency 200-400Hz). In order to reduce the noise pollution caused by the running of automobiles, some European and American countries and Japan have formulated relevant regulations and testing standards. Therefore, it is necessary to modify the polypropylen...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C08L23/12C08L23/08C08K3/34
CPCC08L23/12C08K2201/005C08L23/0815C08K3/34
Inventor 张栋玮陈平绪叶南飚李晟陶四平吴亦健
Owner TIANJIN KINGFA NEW MATERIAL