采用羟基丙烯酸分散体与亲水性多异氰酸酯配漆,制备了双组分水性聚氨酯墙面漆。研究发现,采用水性丙烯酸分散体Bayhydrol 2542和Bayhydrol 2546混拼作为树脂组分,水性多异氰酸酯Bayhydur XP 2547作为固化剂组分,可以制备各方面性能良好...采用羟基丙烯酸分散体与亲水性多异氰酸酯配漆,制备了双组分水性聚氨酯墙面漆。研究发现,采用水性丙烯酸分散体Bayhydrol 2542和Bayhydrol 2546混拼作为树脂组分,水性多异氰酸酯Bayhydur XP 2547作为固化剂组分,可以制备各方面性能良好的墙面漆。同时研究了不同羟基含量、不同n(—NCO)∶n(—OH)、助剂对漆膜性能的影响。结果表明:羟基含量为1.4%,n(—NCO)∶n(—OH)控制在1.50～1.80,选用有机硅消泡剂与聚硅氧烷-聚醚类脱泡剂,用量为0.5%,分散剂用量为0.75%时,可以得到兼有良好耐沾污性、耐水性和低温稳定性的产品。展开更多
Let ：T2k＋1 be the set of trees on 2k＋ 1 vertices with nearly perfect matchings, and let S2k＋2 be the set of trees on 2k ＋ 2 vertices with perfect matchings. The largest Laplacian spectral radii of trees in ：T2k...Let ：T2k＋1 be the set of trees on 2k＋ 1 vertices with nearly perfect matchings, and let S2k＋2 be the set of trees on 2k ＋ 2 vertices with perfect matchings. The largest Laplacian spectral radii of trees in ：T2k＋l and S2k＋2 and the corresponding trees were given by Guo （2003）. In this paper, the authors determine the second to the sixth largest Laplacian spectral radii among all trees in T2k＋1 and give the corresponding trees.展开更多
文摘采用羟基丙烯酸分散体与亲水性多异氰酸酯配漆,制备了双组分水性聚氨酯墙面漆。研究发现,采用水性丙烯酸分散体Bayhydrol 2542和Bayhydrol 2546混拼作为树脂组分,水性多异氰酸酯Bayhydur XP 2547作为固化剂组分,可以制备各方面性能良好的墙面漆。同时研究了不同羟基含量、不同n(—NCO)∶n(—OH)、助剂对漆膜性能的影响。结果表明:羟基含量为1.4%,n(—NCO)∶n(—OH)控制在1.50～1.80,选用有机硅消泡剂与聚硅氧烷-聚醚类脱泡剂,用量为0.5%,分散剂用量为0.75%时,可以得到兼有良好耐沾污性、耐水性和低温稳定性的产品。
基金supported by the National Natural Science Foundation of China under Grant No. 10331020.
文摘Let ：T2k＋1 be the set of trees on 2k＋ 1 vertices with nearly perfect matchings, and let S2k＋2 be the set of trees on 2k ＋ 2 vertices with perfect matchings. The largest Laplacian spectral radii of trees in ：T2k＋l and S2k＋2 and the corresponding trees were given by Guo （2003）. In this paper, the authors determine the second to the sixth largest Laplacian spectral radii among all trees in T2k＋1 and give the corresponding trees.
