{"title":"HTV 硅橡胶疏水偶联改性的制备与机理研究","authors":"Qiang Li, Mingdong Lei, Ziyou Li, Qiang Gan, Yong Sun, Xiaoxing Wei","doi":"10.3389/fmats.2024.1405274","DOIUrl":null,"url":null,"abstract":"Neat high-temperature vulcanized silicone rubber (HTV SR) showed bad hydrophobicity due to the existence of a large number of inorganic reinforcing fillers on its surface, which affected its security application in outdoor insulation systems. In this work, hydrophobic silane chains were grafted onto the surface of inorganic particles on the skin layer of HTV SR by a one-step coupling modification to improve its hydrophobicity. The effects of coupling agent types and coupling reaction conditions on the hydrophobicity of HTV SR were investigated. It was determined that the perfluorooctane trichlorosilicon with a large number of low surface energy fluorine atoms was the preferred coupling agent. The contact angle of HTV SR was increased by 15.70% when the optimal coupling reaction conditions were determined to be a reaction temperature of 60°C, a reaction time of 4 h, and an amount of coupling agent of 0.5%. The study found that both etching reaction and grafting reaction occurred during the whole coupling modification process, which led to the disappearance or decrease of a lot of holes on the HTV SR surface. After the fluorination coupling reaction, the surface of HTV SR became smooth and dense that led to the decrease of water absorption. The result of Fourier-transform infrared spectroscopy analysis showed the formation of C-F bond in HTV SR after fluorination modification, and the energetic dispersive spectroscopy analysis showed that the fluorine content on the surface of the fluorinated HTV SR increased significantly. 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引用次数: 0
摘要
纯净的高温硫化硅橡胶(HTV SR)由于表面存在大量无机增强填料,因此憎水性较差,影响了其在室外隔热系统中的安全应用。在这项工作中,通过一步偶联改性将疏水性硅烷链接枝到 HTV SR 表皮层的无机颗粒表面,以改善其疏水性。研究了偶联剂类型和偶联反应条件对 HTV SR 疏水性的影响。结果表明,具有大量低表面能氟原子的全氟辛烷三氯氢硅是首选的偶联剂。当最佳偶联反应条件确定为反应温度为 60°C、反应时间为 4 小时、偶联剂用量为 0.5%时,HTV SR 的接触角增加了 15.70%。研究发现,在整个偶联改性过程中,既发生了蚀刻反应,又发生了接枝反应,使 HTV SR 表面的孔洞大量消失或减少。氟化偶联反应后,HTV SR 表面变得光滑致密,从而降低了吸水性。傅立叶变换红外光谱分析结果表明,氟化改性后 HTV SR 中形成了 C-F 键,而能谱色散分析表明,氟化 HTV SR 表面的氟含量显著增加。此外,稳定性分析表明,氟化 HTV SR 仍具有良好的热稳定性和机械性能稳定性。
Preparation and mechanism research on hydrophobic coupling modification of HTV silicone rubber
Neat high-temperature vulcanized silicone rubber (HTV SR) showed bad hydrophobicity due to the existence of a large number of inorganic reinforcing fillers on its surface, which affected its security application in outdoor insulation systems. In this work, hydrophobic silane chains were grafted onto the surface of inorganic particles on the skin layer of HTV SR by a one-step coupling modification to improve its hydrophobicity. The effects of coupling agent types and coupling reaction conditions on the hydrophobicity of HTV SR were investigated. It was determined that the perfluorooctane trichlorosilicon with a large number of low surface energy fluorine atoms was the preferred coupling agent. The contact angle of HTV SR was increased by 15.70% when the optimal coupling reaction conditions were determined to be a reaction temperature of 60°C, a reaction time of 4 h, and an amount of coupling agent of 0.5%. The study found that both etching reaction and grafting reaction occurred during the whole coupling modification process, which led to the disappearance or decrease of a lot of holes on the HTV SR surface. After the fluorination coupling reaction, the surface of HTV SR became smooth and dense that led to the decrease of water absorption. The result of Fourier-transform infrared spectroscopy analysis showed the formation of C-F bond in HTV SR after fluorination modification, and the energetic dispersive spectroscopy analysis showed that the fluorine content on the surface of the fluorinated HTV SR increased significantly. Moreover, the stability analysis showed that the fluorinated HTV SR still had a good thermal stability and mechanical property stability.
期刊介绍:
Frontiers in Materials is a high visibility journal publishing rigorously peer-reviewed research across the entire breadth of materials science and engineering. This interdisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers across academia and industry, and the public worldwide.
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