共聚醚二醇对叠层聚氨酯支座耐低温性能的影响

Influence of Copolyether Diol on Low Temperature Resistance of Laminated Polyurethane Bearings

关键词:  共聚醚二醇  叠层聚氨酯支座  耐低温性能  微相分离程度  竖向刚度  等效水平刚度

Key words:  copolyether diol  laminated polyurethane bearing  low temperature resistance  degree of microphase separation  vertical stiffness  equivalent horizontal stiffness

摘要:

通过引入3-甲基-四氢呋喃/四氢呋喃共聚醚二醇（3MCPG）来提高可浇筑式叠层聚氨酯支座（CLPB）的耐低温性能，从微观层面研究3MCPG质量分数（0%、6%、9%、12%、15%、25%）对聚氨酯弹性体（PUE）的影响机理，对改性后的PUE及CLPB分别在23、0、-10、-20 ℃下进行一系列力学试验.结果表明：3MCPG的引入降低了PUE软硬段的微相分离程度和玻璃化转变温度；相对于23 ℃，PUE-0%和PUE-25%的抗拉强度在-20 ℃分别增加了50.8%、20.1%，CLPB-15%和CLPB-25%的竖向刚度较CLPB-0%分别下降了2.5%、4.4%，CLPB-0%和CLPB-25%的水平刚度在-20 ℃分别增加了106.0%、44.2%.

Abstract:

The low temperature resistance of castable laminated polyurethane bearings（CLPB） was improved by introducing 3-methyl-tetrahydrofuran/tetrahydrofuran copolyether glycol（3MCPG）. The mechanism of the effect of different 3MCPG mass fractions （0%， 6%， 9%， 12%， 15%， and 25%） on the polyurethane elastomer（PUE） was investigated at the microscopic level， and a series of mechanical experiments were conducted at 23， 0， -10， -20 ℃ for the modified PUE and CLPB， respectively. The results show that， by the introduction of 3MCPG， the degree of microphase separation and glass transition temperature of the soft and hard segments of PUE are reduced. Compared to the tensile strength at 23 ℃， the tensile strength of PUE-0% and PUE-25% at -20 ℃ is increased by 50.8% and 20.1%， and the vertical stiffness of CLPB-15% and CLPB-25% compared to that of CLPB-0% is decreased by 2.5% and 4.4%， and the horizontal stiffness of CLPB-0% and CLPB-25% is increased by 106.0% and 44.2% at -20 ℃， respectively.