聚顺丁二烯改性聚醚型聚氨酯的制备与性能

Preparation and Performance of Polyether Polyurethane Modified Hydroxyl-terminated Polybutadiene

为探讨端羟基聚顺丁二烯(HTPB)链节对聚醚型水性聚氨酯应用性能的影响,研究了不同用量的HTPB对水性聚氨酯乳液黏度、粒径及胶膜力学性能和耐水性的影响。结果表明:随着HTPB含量的增加,试样胶膜的拉伸强度和耐水性呈先增加后降低的趋势;当HTPB接入量在7%时,改性水性聚氨酯胶膜的综合性能最佳,拉伸强度为5.0 MPa,断裂伸长率为608%;试样胶膜在水中浸泡72 h后的吸水率为13%;HTPB的用量明显地影响软段相区和软、硬相区的共混性。软段相区的均匀共混能改善胶膜的拉伸强力和耐水性能,而软、硬相区的共混则有助于提高胶膜的耐水性能,但却会降低胶膜的断裂伸长率。

In order to know the influence of hydroxy-terminated polybutadiene(HTPB) on the application properties of hydrophilic polyether polyurethane, the effects of HTPB content on the emulsion viscosity, emulsion particle size, water resistance and mechanical properties of the samples’ membrane were studied. The study shows that the tensile strength of the samples’ membrane tends to be improved and then damaged with the increase of HTPB content in receipts. The combination properties of modified polyurethane will be optimized(tensile strength is 5.0 MPa, the breaking elongation is 608% and the water absorbing after immerging water for 72 h is 13%) when the HTPB content is 7%. Furthermore, the compatibility of soft domain and hard domain including different soft domains are distinctly influenced. The water resistance of samples membrane will also be enhanced due to better compatibility of different soft domains. Though the better water resistance of membrane also depends on better compatibility of soft and hard domains, the contrary effect on the breaking elongation is also severe.