聚氨酯高聚物注浆材料的制备及性能研究

Preparation and properties of polyurethane polymergrouting materials

制备了不同密度(0.1,0.3,0.5,0.7g/cm^(3))的双组份聚氨酯高聚物注浆材料,通过FT-IR、SEM、应力-应变、导热系数和冻融循环等测试,研究了不同密度对注浆材料力学性能、保温性能和抗冻性能的影响。结果表明,密度的差异并未对聚氨酯的结构造成影响,没有产生新的特征峰。随着密度的适当增大,注浆材料的胞体尺寸变小,胞体的数量增多,胞体的均匀性和强度得到改善。随着密度的增加,注浆材料到达稳定阶段对应的最大应力、抗压强度和弹性模量均先增大后减小,当密度为0.5 g/cm^(3)时,注浆材料稳定阶段对应的应力最大为11.09 MPa,抗压强度最大为10.02 MPa,弹性模量最大为189.62 MPa。制备的注浆材料导热系数分布区间为0.06~0.08 W/(m·K),具有低导热系数,隔热保温性能较好。在40次冻融循环后,当密度为0.5 g/cm^(3)时,注浆材料的冻融循环强度的损失率最低为16.06%,抗冻性能优异。

Two component polyurethane polymer grouting materials with different densities(0.1,0.3,0.5,0.7 g/cm^(3))were prepared.The effects of different densities on the mechanical properties,thermal insulation properties and frost resistance of grouting materials were studied by FT-IR,SEM,stress-strain,thermal conductivity and freeze-thaw cycle tests.The results showed that the difference of density didn t affect the structure of polyurethane,and no new characteristic peak was produced.With the proper increase of density,the cell size of grouting material became smaller,the number of cells increased,and the uniformity and strength of cells were improved.With the increase of density,the maximum stress,compressive strength and elastic modulus corresponding to the stable stage of grouting materials increased first and then decreased.When the density was 0.5 g/cm^(3),the maximum stress corresponding to the stable stage of grouting materials was 11.09 MPa,the maximum compressive strength was 10.02 MPa,and the maximum elastic modulus was 189.62 MPa.The thermal conductivity distribution range of the prepared grouting material was 0.06~0.08 W/(m·K),with low thermal conductivity and good thermal insulation performance.After 40 freeze-thaw cycles,when the density was 0.5 g/cm^(3),the loss rate of freeze-thaw cycle strength of grouting material was the lowest 16.06%,and the frost resistance is excellent.