冷热交替水热环境对玻璃钢性能的影响

Effects of Alternate Cooling and Heating Hydrothermal Aging on Properties of Glassfiber Reinforced Plastics(GRP)

采用手糊工艺分别制作了玻璃纤维和不饱和聚酯树脂质量比为2∶8、3∶7和4∶6的玻璃钢试样,对玻璃钢试样进行了80℃/12 h、20℃/12 h冷热交替水热老化实验288 h,研究了冷热交替水热老化对玻璃钢力学性能、硬度、质量及吸水性能的影响。结果表明:水热老化降低了玻璃钢的强度、硬度和质量,强度降低明显,但硬度和质量保持率较高,保持率分别达90%和97%以上;随着玻璃纤维含量的增加,水热老化后,玻璃钢的吸水率逐渐增大,吸水膨胀率逐渐降低,玻璃纤维和不饱和聚酯树脂质量比为3∶7的玻璃钢具有最高的强度保持率和硬度保持率,拉伸、弯曲和冲击强度保持率分别为71.15%、88.98%和92.64%,硬度保持率为98.86%。

Glassfiber reinforced plastics(GRP) specimens, whose mass ratios of glassfiber and unsaturated polyester resin were 2∶8, 3∶7 and 4∶6 respectively, were prepared by hand lay-up. The GRP specimens were hydrothermal aged for 288 h at alternated aging environment of 80℃/12 h and 20℃/12 h, the alternate cooling and heating hydrothermal aging on the mechanical properties, Barcol hardness, mass and water uptake’ properties of GRP specimens were investigated. The results show that, hydrothermal aging reduced the strengths, hardness and mass of the specimens, the strengths were decreased obviously, while the hardness and mass could be maintained to a great extent. With the increase of the content of glassfiber, the GRP specimens would absorb more water and expand to a less extent, the specimen whose mass ratio of glassfiber and resin was 3∶7 had the greatest strengths and hardness retentions.