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本文对玻璃钢进行了在空气中的交变温度试验、水浸泡试验和水介质中冻融循环试验。本文指出,对于手糊制品,水介质中的冻融循环实际上起到强化水介质浸入玻璃钢内部,使树脂-纤维界面粘结的破坏作用,从而加速了玻璃钢界面结构的破坏。同时也指出了交变温度对玻璃钢结构的疲劳破坏作用。试验结果表明,未经偶联剂处理的手糊189~#聚酯玻璃钢,不同力学性能受冻融循环影响的敏感性是不同的。经±30℃、14次水冻融循环后,常温下的干态拉伸强度下降11.3%;在空气介质中,经±30℃突变温度循环后,下降6.9％;而在静水介质中浸泡14天后,强度下降仅6％。当纤维经KH-550处理后,有利于保护树脂-纤维的界面粘结,提高了抗冻融循环的能力。
In this paper, the glass fiber reinforced plastics in the air alternating temperature test, water immersion test and water medium freeze-thaw cycle test. This paper points out that for the hand lay-up products, the freeze-thaw cycles in aqueous media actually act to reinforce the water medium’s internal infiltration into the FRP and degrade the resin-fiber interfacial adhesion, thus accelerating the fracture of the FRP interface structure. At the same time, it also points out the fatigue damage effect of the alternating temperature on the FRP structure. The experimental results show that the sensitivities of different mechanical properties of freeze-thaw cycles are different for the uncoated 189 ~ # polyester fiberglass. The dry tensile strength at room temperature decreased by 11.3% after ± 30 ℃ and 14 cycles of freeze-thaw cycles. In the air medium, the temperature was decreased by 6.9% after the mutation temperature was changed by ± 30 ℃. Days later, the intensity dropped only 6%. When the fibers are treated with KH-550, it helps to protect the resin-fiber interfacial adhesion and enhances the resistance to freeze-thaw cycles.