高速铁路用聚氨酯树脂嵌缝胶的研制

以混合聚醚多元醇和不同种类的二异氰酸酯为原料制备了预聚体,采用扩链剂和聚醚多元醇为交联剂,合成了一种双组分聚氨酯嵌缝胶。研究了预聚体中异氰酸酯种类、异氰酸根(NCO)含量、聚醚多元醇种类对涂膜力学性能的影响。结果表明,采用MDI-3051和自制聚醚为原料,NCO质量分数在6%时,所制备的嵌缝胶拉伸强度为1.87 MPa,断裂伸长率为983%,粘结强度为1.2 MPa,嵌缝胶性能优异,能满足客运专线桥梁混凝土桥面伸缩缝的技术要求。

Research of Polyurethane Expansion Joint for High Speed Railway

The two-component polyurethane expansion joint were synthesized by the method of prepolymer based on mixed polyether polyols, diisocyanate and composite chain extenders. The effects of the type of isocya-nate,the percentage of NCO in prepolymer and the type of polyether polyols were discussed. The results showed that the properties of the obtained polyurethane expansion joint were excellent when raw materials were MDI-3051 , homemade polyether and the NCO content was 6%, while tensile-strength was 1.87 MPa, the elongation at break was 983% and the bond strength was 1.2 MPa. The expansion joint meets technical specification for concrete bridge deck of special passenger railway lines.