抽油杆用CF/VE拉挤复合材料在酸性介质中的老化行为研究

文中研究了碳纤维/乙烯基酯树脂（CF/VE）拉挤复合材料在65℃和95℃、质量分数为5％的H₂SO₄水溶液中的吸湿特性、以及材料的动态力学性能和静态力学性能的变化。结果表明，在5%H₂SO₄水溶液中，浸泡前期复合材料的吸湿与Fick扩散相似，但后期吸湿率略有下降；拉挤复合材料的力学损耗（tanδ）随浸泡时间的延长而增大，且温度越高影响越大；玻璃化转变温度（T_g）、储能模量（E′）以及弯曲强度和剪切强度随浸泡时间的延长而下降，且温度越高，下降幅度越大。

Aging behavior of pultruded carbon fiber/vinyl ester resin composite used for sucker rods in acid solution

The moisture absorption characteristics and the changes in the static and dynamic mechanical properties of the pultruded unidirectional carbon fiber/vinyl ester resin (CF/VE) composite, which is used for making sucker rods for oil fields, were studied during the immersion of it in a 5% H₂SO₄ aqueous solution at 65℃ and 95℃. The results showed that at the early immersion stage in the solution, the moisture absorption behavior of the composite was similar to the Fick's second law, that is, the moisture content of the composite increased rapidly at the early immersion and was linear with t^1/2, but the moisture content decreased a little at the late stage. The storage modulus (E′) of the pultruded CF/VE composite decreased with the immersion time, while the loss factor (tanδ) increased. Furthermore, the higher the temperature was the more serious the effects were. The decreases in the glass transition temperature (T_g), flexural strength and the interlaminar shear strength of the composite were relative to the increase in the moisture content.