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    ²Î¿¼ÎÄÏ×£º

    [1] oertel, g. polyurethane handbook, 2nd edition. hanser gardner publications, 1994.
    [2] liu, j., & wang, h. (2020). "effect of aromatic isocyanates on the weathering resistance of polyurethane coatings." progress in organic coatings, 140, 105502.
    [3] zhang, y., et al. (2018). "thermal and uv aging behavior of polyurethane elastomers based on different mdi derivatives." polymer degradation and stability, 156, 1-10.
    [4] technical data sheet: suprasec 9258. available online at www..com
    [5] astm d2247 – standard practice for testing water resistance of coatings in 100?% relative humidity.

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