【摘要】 以液化二苯基甲烷二异氰酸酯、蓖麻油多元醇和1,4-丁二醇为原料，制备了双组份聚氨酯胶结料，通过红外光谱仪、万能试验机、硬度计、差示扫描量热仪等研究了蓖麻油多元醇官能度对聚氨酯胶结料结构性能的影响。结果表明，随着软段蓖麻油多元醇官能度增大，聚氨酯胶结料氢键化程度逐渐增大，软段玻璃化温度逐渐升高，表干时间与实干时间逐渐缩短，硬度、拉伸强度逐渐增大，断裂伸长率先增大后减小，平衡吸水率逐渐减小；蓖麻油多元醇官能度为3.0时的聚氨酯胶结料综合性能最佳，其硬度为75 HA、拉伸强度为28 MPa、断裂伸长率为134%、平衡吸水率为0.44%,浸水28 d后，其湿态拉伸强度为20 MPa。更多还原

【Abstract】 Two-component polyurethane binders were prepared with liquefied diphenylmethane diisocyanate, castor oil polyols, and 1,4-butanediol. The effect of castor oil polyols’ functionality on the structure and performance of polyurethane binders were investigated using infrared spectrometer, universal testing machine, hardness tester, differential scanning calorimeter and so on. The results showed that, with increasing the functionality of the castor oil polyol, the hydrogen bonding degree and glass transition temperature of the polyurethane binder increased, the tack-free time and curing time shortened, the hardness and tensile strength increased, the elongation at break increased firstly and then decreased, and the equilibrium water absorption decreased. The two-component polyurethane binder with functionality of 3.0 showed the best overall performance. It had a hardness of 75 HA, tensile strength of 28 MPa, elongation at break of 134%, equilibrium water absorption of 0.44%, and wet tensile strength of 20 MPa after immersing in water for 28 d.更多还原