High-sound-absorption stone-impact-resistant fiber composite board for passenger car bottom protection and preparation method of high-sound-absorption stone-impact-resistant fiber composite board
A fiber composite, passenger car technology, applied in the direction of film/sheet adhesives, adhesives, etc., can solve the problem of GMT bottom guard plate not appearing
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Embodiment 1
[0040] A Geely Xingyue L car bottom protection high sound-absorbing fiber composite board, the bulk density of which is 0.32g / cm 3 , plate thickness 5mm, figure 2 It is a schematic diagram of the Alpha-Cabin test results of a specific implementation case of the present invention; the rhombus is the target value, and the Alpha-Cabin reverberation room test standards are: 400Hz≥0.2; 500Hz≥0.30; 630Hz≥0.40; 800Hz≥0.5; 1000Hz≥0.6; 1250Hz≥0.7; 1600Hz≥0.8; 2000-8000Hz≥0.85.
[0041] The specific preparation method is as follows:
[0042] The thermoplastic polypropylene fiber and the glass fiber are uniformly mixed in proportion, and the GMT core material is obtained through carding, laying and needle punching.
[0043] Put the GMT core material into an oven to heat, the oven temperature is 200-210°C, and the baking time is 3-5min. After leaving the oven, apply thermoplastic film layer 3 and the first non-woven fabric layer on the surface of the GMT core material 2 and high-fluid...
Embodiment 2
[0050] A high sound-absorbing fiber composite plate for the underbody protection of a Toyota Senna model, with a bulk density of 0.19g / m 3 , the plate thickness is 7mm, image 3 It is a schematic diagram of the Alpha-Cabin test results of the second embodiment of the present invention; the rhombus is the target value, and the Alpha-Cabin reverberation room test standard: 500Hz≥0.3; 630Hz≥0.4; 800Hz≥0.5; 1000Hz≥0.6; 1250Hz≥0.7; 1600Hz ≥0.8; 2000Hz≥0.9.
[0051] The composite fiber mat 2 is obtained by uniformly mixing thermoplastic polypropylene fibers and glass fibers in proportion, carding, laying, and needle punching.
[0052] Put the GMT fiber mat 2 into an oven to heat, and the temperature of the oven is 210-220°C. Subsequently, the fiber mat 2 is put into a high-temperature composite machine, and the temperature of the composite machine is 195-210° C., and the GMT composite plate 2 is obtained after cooling and forming.
[0053] The weight range of the high-fluidity fi...
Embodiment 3
[0058] A high sound-absorbing fiber composite plate for BMW X3 car underbody protection, with a bulk density of 0.2g / m 3 , the plate thickness is required to be 7mm, Figure 4 It is a schematic diagram of the Alpha-Cabin test results of the third specific implementation case of the present invention; the rhombus is the target value, and the results of the Alpha-Cabin reverberation chamber require: 400Hz≥0.25; 500Hz≥0.35; 630Hz≥0.45; 800Hz≥0.55; 1000Hz≥0.65; 1250Hz -5000Hz≥0.75; 6300Hz≥0.7; 8000Hz≥0.65.
[0059] The composite fiber mat 2 is obtained by uniformly mixing thermoplastic polypropylene fibers and glass fibers in proportion, carding, laying, and needle punching.
[0060] Put the GMT fiber mat 2 into an oven for heating, and the temperature of the oven is 220-230°C. Subsequently, the fiber mat 2 is put into a high-temperature composite machine, and the temperature of the composite machine is 210-230° C., and the GMT composite plate 2 is obtained after cooling and for...
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