玻璃纤维增强聚酰胺66耐冷却液性能研究

从冷却液对材料力学性能影响的角度出发，研究了玻璃纤维增强聚酰胺材料在冷却液中的老化作用。选用质量分数为30 %的玻璃纤维增强聚酰胺66（PA66/30 %GF）开展冷却液热老化试验（1008 h，125 ℃），研究在冷却液加速热老化过程各阶段材料的弯曲强度和冲击性能，并从微观结构的变化来分析其机理。结果表明，杜邦和索尔维的PA66/30 %GF经历1008 h老化后，弯曲强度大于70 MPa，性能保持率超过25 %，适宜在冷却液环境中长期使用。

Study on Coolant Resistance of Glass-Fiber-Reinforced Polyamide 66

The coolant resistance of glass-fiber-reinforced polyamide 66(PA 66)was investigated,and the effect of coolant on their mechanical properties was studied. The bending strength and impact strength was evaluated at different aging stage for the PA 66-matrix composite containing 30 wt% glass fiber during 1008-hour thermal aging test in coolant.Moreover,the microstructure was investigated and the corresponding aging mechanism was discussed. The results indicated the materials PA66/30%GF-1 and PA66/30%GF-2 achieved the bending strength higher than 70 MPa along with the retention higher than 25 %. It was concluded that the PA 66 composites with 30 wt% glass fiber supplied by DuPont and Solvay were suitable for long-term use under the coolant condition.