风力发电机主轴油封用浇注型聚氨酯弹性体研究

Study on Casting Polyurethane Elastomer for Oil Seal of Wind Generator Spindle

以聚碳酸酯二醇、对苯二异氰酸酯和1,4-丁二醇为原料,分别采用预聚体法和一步法合成浇注型聚氨酯弹性体(CPU),并用少量碳纤维(CF)增强合成了一系列用于风力发电机主轴油封的CPU复合材料。研究了聚合工艺对CPU材料力学性能、耐润滑脂性能、耐磨性能和动态性能的影响;还研究了CF添加量对CPU复合材料力学性能、导热性能的影响,并与风力发电机主轴油封用橡胶材料进行对比。结果表明,预聚体法合成的CPU材料具有较优的拉伸强度、撕裂强度、耐磨性能、动态性能和耐润滑脂老化性能;一步法合成的CPU复合材料具有较优的断裂伸长率;预聚体法合成的CF质量分数为2%的CPU复合材料具有较好的导热性能且不影响物理机械性能。

Casting polyurethane elastomer(CPU) were synthesized with polycarbonate diol, p-phenylene diisocyanate and 1,4-butanediol by prepolymering method and one-step method respectively, then a series of CPU composites materials for wind generator spindle oil seals was prepared by reinforcing with a small amount of carbon fiber(CF). The effects of polymerization process on mechanical properties, grease resistance, wear resistance and dynamic properties of CPU materials were studied. The influence of CF content on the mechanical and thermal conductivity of CPU composites were also studied, and compared with rubber material used for oil seal of wind generator spindle. The results showed that the CPU material synthesized by prepolymer method had better tensile strength, tear strength, wear resistance, dynamic performance and grease aging resistance. The CPU synthesized by one step method had better elongation at break. The CPU composites synthesized by prepolymer method with CF mass fraction of 2% had good thermal conductivity. The physical and mechanical properties of CPU composites were not affected.