疏水CY184/E-PDMS环氧树脂复合材料的制备及性能

Preparation and performance of hydrophobic CY184/E-PDMS epoxy resin composite

环氧树脂虽然具有良好的耐漏电流和抗击穿等电气性能和力学性能,但由于其本身缺乏疏水性,因此在户外绝缘子领域难以大范围应用。为了解决环氧树脂疏水差的问题,采用γ-氨丙基三乙氧基硅烷(APTES)、六氢邻苯二甲酸双缩水甘油酯(CY184)对羟基封端的聚二甲基硅氧烷(HPDMS)进行改性,合成了含有环氧基团的疏水改性剂E-PDMS,并制备了CY184/E-PDMS复合材料。结果表明,接枝了环氧基团的E-PDMS与CY184相容性良好,当E-PDMS质量分数达到10%时,复合材料水接触角能稳定在105°,呈现疏水性;体积电阻率提升至1.36×10^(14)Ω·m,介电常数在1000 Hz下降低至3.55,玻璃化转变温度和拉伸强度分别提升至117℃和59.4 MPa。经过E-PDMS改性后,CY184环氧树脂的疏水性、绝缘性、力学性能、热稳定性等均有明显提升,拓宽了CY184环氧树脂在绝缘子领域的应用。

Despite epoxy resin excellent electrical and mechanical properties,such as leak-proof and rupture resistance,it is difficult to be widely used in outdoor insulation because of its poor hydrophobicity.In order to solve the hydrophobic problem of epoxy resin,hydroxyl terminated polydimethylsiloxane(HPDMS)was modified byγ-aminopropyltriethoxysilane(APTES)and diglycidyl hexahydrophthalate(CY184).A hydrophobic-modifying agent E-PDMS was synthesized,and CY184/E-PDMS compos‐ite was prepared.The results show that E-PDMS grafted with epoxy group has good compatibility with CY184 epoxy resin.When the mass fraction of E-PDMS reaches 10%,the hydrophobic angle of the composites can be stabilized at 105°,the volume resistivity increases to 1.36×10^(14)Ω·m,the dielectric constant decreases to 3.55 at 1000 Hz,the glass transition temperature and tensile strength increase to 117℃and 59.4 MPa,respectively.After E-PDMS modification,the hydrophobic,insulating,mechanical and thermal stability properties of epoxy resin are obviously improved,which broadens the application field of epoxy resin in the field of insulators.