双组分聚氨酯道桥密封膏的研制

The Research of Two-Component Polyurethane Sealant for Road and Bridge

以聚醚多元醇、甲苯二异氰酸酯(TDI)、扩链剂、填料、复合催化剂、增塑剂、触变剂为主要原料,制备了一种低模量、高弹性、高粘接力的双组分聚氨酯道桥密封膏,讨论了影响该密封膏性能的因素。结果表明,当异氰酸酯指数在1.0～1.35、复合催化剂用量在0.9%～1.1%、触变剂用量为10%～12%、活性轻钙用量为18%～21%时,制备的密封膏的拉伸模量、下垂度、可施工时间、表干时间、弹性等性能较佳。同时通过采用自制的复合催化剂体系,利用化学增稠的方法解决了搅拌速度低对生产设备带来的问题,获得了性能优异的产品。

A low modulus, high elasticity, high bonding of two-component polyurethane sealant which were applied to road and bridge was prepared mainly from polyether polyol, toluene isocyanate, chain extender, padding,plasticizer and thixotropic agent. The affecting factors on the sealant performances were discussed. The results showed that the performance of sealant including tensile modulus, sag, construction time, dry time and flexibilitywere better when the isocyanate index （R） was from 1.0 to 1.35, the composite catalyst dosage was 0. 9% to 1.1%, the thixotropic agent dosage was 10% to 12%, the activity light calcium dosage was 18% to 21%. At thesame time, the problems of production and performance that were caused by low speed mixing equipment were solved and excellent performance of product was obtained by using self-made compound catalyst system and chemical thickening.