Research Article
The Effects of Various Additive Components on the Sound Absorption Performances of Polyurethane Foams
Table 4
Main components and properties of the foams.
| | Main component | Group 1 | Group 2 | Group 3 | Group 4 | | (parts by weight) | (parts by weight) | (parts by weight) | (parts by weight) |
| | 3630 | 28 | 28 | 28 | 28 | | 330N | 52 | 52 | 52 | 52 | | MDI | 28.8 | 28.8 | 28.8 | 28.8 | | Catalyst A33 | 0.9 | 0.9 | 0.9 | 0.9 | | Catalyst A1 | 0.04 | 0.04 | 0.04 | 0.04 | | Silicone | 0.9 | 0.9 | 0.9 | 0.9 | | TEA | 1.0 | 1.0 | 1.0 | 1.0 | |
141b | 5.0 | 5.0 | 5.0 | 5.0 | | Water | 3.8 | 4.1 | 4.4 | 4.7 | | Density (kg/m3) | 81.2 | 75.0 | 64.8 | 61.9 | | Airflow resistivity | 17,800 | 16,500 | 13,800 | 9,800 | | Porosity | 72 | 79 | 85 | 91 |
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