PDMS改性环氧树脂/Sm2O3复合涂层的近红外光谱及疏水性研究

以聚二甲基硅氧烷（PDMS）改性环氧树脂（HYSZ）为粘合剂，Sm₂O₃为功能颜料，纳米SiO₂为微纳结构改性剂，制备得到了一种同时具有良好疏水性能和附着力的近红外吸收涂层。系统分析了PDMS和HYSZ质量比、邻苯二甲酸二辛酯(DOP)添加量、总填料添加量、Sm₂O₃和纳米SiO₂质量比对涂层性能的影响。结果表明：PDMS改性可明显降低涂层的表面能，从而使涂层的疏水性得到明显增强。利用DOP强化涂层韧性和微观搭桥作用可增强涂层整体性，从而可明显提高涂层的附着力和近红外吸收性能。涂层的表面粗糙度可随总填料添加量的增加而明显升高，进而可使涂层表现出更优的疏水性能。当涂层中PDMS和HYSZ质量比、DOP添加量、总填料添加量、Sm₂O₃和纳米SiO₂质量比分别为1∶9，20%，50%和5.5∶4.5时，涂层同时具有良好的近红外低反射率（59.1%）、疏水性能（水接触角为137°）及附着力（2级）。

Study on Near-Infrared Spectroscopy and Hydrophobicity of PDMS Modified Epoxy Resin/Sm2O3 Composite Coating

Using polydimethylsiloxane (PDMS) modified epoxy resin (HYSZ) as a binder, Sm₂O₃ as a functional pigment, and nano-SiO₂ as a micro-nano structural modifier, a near-infrared absorption coating with good hydrophobic properties and adhesion strength was prepared. The effects of the mass ratio of PDMS to HYSZ, DOP addition amount, total filler addition amount, and the mass ratio of Sm₂O₃ to nano-SiO₂ on the coating performances were systematically analyzed. The results show that: PDMS modification can significantly reduce the surface energy of the coating, thereby significantly enhancing the hydrophobicity of the coating. The use of DOP to strengthen the toughness of the coating and the micro-bridging effect can enhance the integrity of the coating, which can significantly improve the adhesion strength and near-infrared absorption performance of the coating. The surface roughness of the coating can be significantly increased with the increase of the total filler addition, so that the coating can exhibit better hydrophobic properties. When the mass ratio of PDMS to HYSZ, DOP addition amount, total filler addition amount, and the mass ratio of Sm₂O₃ to nano-SiO₂ are 1∶9, 20%, 50%, 5.5∶4.5 in the coating, respectively, the coating has good near-infrared low reflectivity (59.1%), hydrophobic performance (water contact angle is 137°) and adhesion strength (2 grade).