Abstract：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).
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