Research Article
The Effects of Various Additive Components on the Sound Absorption Performances of Polyurethane Foams
Table 5
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 | 141b | 5.0 | 5.0 | 5.0 | 5.0 | Water | 3.8 | 3.8 | 3.8 | 3.8 | TEA | 1.8 | 2.1 | 2.4 | 2.7 | Density (kg/m3) | 81.6 | 78.3 | 74.36 | 70.5 | Airflow resistivity | 17,100 | 16,700 | 15,200 | 14,900 | Porosity | 74 | 82 | 87 | 89 |
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