雨季坑槽修补用聚氨酯的制备及路用性能研究

以二苯基甲烷二异氰酸酯(MDI50)和改性蓖麻油多元醇(BHA130)为主要原料，制备了单组份聚氨酯(SPU)；将SPU与玄武岩骨料混合，得到单组份聚氨酯混合料(SPUM)；研究了异氰酸酯(NCO)含量对SPU力学性能和耐水性能的影响，以及NCO含量和浸水时间对SPUM路用性能的影响，并通过对雨季路面坑槽的实际修补，验证了SPUM的修补效果。结果显示：在本文的实验范围内，随着NCO含量的增加，SPU的拉伸强度、拉伸剪切强度、平衡吸水率增大，断裂伸长率减小；NCO含量为12%(质量分数)时，SPU的综合性能相对较优，其拉伸强度为23.0MPa，水下拉伸剪切强度为2.75MPa，平衡吸水率为3.49%；SPUM的劈裂强度随NCO含量增加和浸水时间延长而增大，肯塔堡飞散损失率小于4%；浸水20min时，SPUM的马歇尔稳定度可达8.47kN；使用NCO含量为12%的SPUM对雨季路面坑槽进行修补，修补后8个月坑槽未发生明显磨损。以上结果表明，制备的SPUM的修补强度高、水稳定性好，能够用于雨季路面坑槽的修补。

Preparation and performance of polyurethane in pavement pothole repair during the rainy season

Single-component polyurethane (SPU) materials have been prepared using diphenylmethane diisocyanate (MDI50) and modified castor oil polyol (BHA130) as the main raw materials. SPU mixtures (SPUM) were obtained by mixing SPU with basalt aggregate. The effects of isocyanate (NCO) content on the mechanical properties and water resistance of SPU, and the effects of NCO content and immersion time on the pavement performance of SPUM, were studied. The efficacy of SPUM was verified by the repair of actual pavement potholes during the rainy season. The results showed that in the experimental range employed, the tensile strength, tensile shear strength and equilibrium water absorption of SPU increased with increasing NCO content, and the elongation at break decreased. The optimal overall performance of SPU was obtained with an NCO content of 12% (mass fraction). The tensile strength of this material is 23.0 MPa, the underwater tensile shear strength is 2.75 MPa, and the equilibrium water absorption is 3.49%. The splitting strength of SPUM increases with increasing NCO content and immersion time, and the Cantabro loss is less than 4%. When immersed in water for 20 min, the Marshall stability of SPUM reached 8.47 kN. After using SPUM with 12% NCO content to repair pavement potholes in the rainy season, the potholes showed no obvious wear after eight months. The results show that the material has high repair strength and good water stability and can be used for the practical repair of pavement potholes during the rainy season.