Preparation and Properties of EPDM-Based Composite Coatings with Low Infrared Emissivity

摘要

Low-infrared-emissivity coatings were prepared using metallic particles (including Cu, Al, Ni, Ag, etc.) and an ethylene-propylene-diene monomer (EPDM) binder. The effects of size, shape, morphology, and content of metallic particles on infrared emissivity of the coatings were systematically investigated. The principles of the low-infrared-emissivity and low-solar-reflectance coatings are discussed in terms of reflection, emissions, and chemical structure. The thermal insulation performance of composite coatings is studied via a simulation model. Mechanical properties of composite coatings are studied by using circle-cut test and impact strength test. The composite coatings are also tested for corrosion behavior with potentiodynamic polarization. The results indicate that when the Cu particles and Al particles are flaky and high-leafing, they have the minimum coating emissivity, exhibiting infrared emissivity values of 0.33-0.40 and solar reflectance values of 0.38-0.53. The formation of low-infrared-emissivity coatings depends highly on the size and shape of the metallic particles. A simulation model is proposed to account for thermal insulation properties of the coatings, which indicates that an EPDM/Cu-powder coating achieves good thermal insulation performance, with a 4 degrees C relative temperature drop. The low-infrared-emissivity composite coatings also show excellent corrosion resistance and mechanical performance.