聚酯纤维布混杂增强环氧树脂可钻复合材料的制备与性能研究

Preparation and properties research of drillable epoxy composites mixedly enhanced by polyester-fiber fabric

采用聚酯纤维布与碳纤维、Kevlar纤维分别混杂增强环氧树脂,制备满足油田开发的可钻桥塞用高性能复合材料。分别采用液体芳胺(DETDA)与固体芳胺(DDM)作为固化剂,两种材料有着相近的玻璃化转变温度和力学强度。以DETDA固化的树脂基体中,活性环氧稀释剂用量增加,拉伸强度变化不大,但材料的弹性模量在10%稀释剂用量时,达到最大值;树脂交联密度1000/Mc为2.35时,材料的模量和拉伸强度都处于相对较大值。聚酯纤维/Kevlar纤维和聚酯纤维/碳纤维混杂增强环氧树脂复合材料的模量和强度,分别随着Kevlar纤维和碳纤维含量的增加而增加,有碳纤维的复合材料拉伸强度增加较大,断裂伸长率相对较小。实验显示:聚酯纤维混杂增强复合材料具有较好的可钻性,在钻压为1.5吨,钻速为32转/分的条件下,磨铣速度为4 mm·min^(-1)。

In this work,polyester-fiber cloth combined with carbon-fiber cloth and Kevlar-fiber cloth was used to enhance epoxy resins, and then these composites were drillable and prepared to meet the demands of oil exploitation. The composites cured by liquidaromatic amine（ DETDA） and solid-aromatic amine（ DDM） respectively and exhibit similar glass transition temperatures and mechanical properties. In the epoxy resin cured by DETDA,its tension strength shows no obvious change as the mount of epoxy reactive diluent increasing,but its elastic modulus reaches the pick value at the diluents content of 10%. When the crosslink density（ 1000/ Me） of the resins was about 2. 35, the composites cured by DETDA show the highest values both of elastic modulus and tension strength. As composites hybrid-enhanced by polyester/carbon fiber,both the modulus and the tension strength increase with contentof the carbon fiber,so does those of polyester/Kevlar fiber composites. The polyester/carbon fiber composites show a higher increase of tension strength and a lower value of elongation at break. The composites hybrid-enhanced by polyester/carbon fiber or polyester/ Kevlar fiber could be drilled efficiently. The grinding velocity is about 4 mm＊ min 1 for the composites,when the drilling pressure is about 1. 5 ton and rotation speed is 32 RPM.