Abstract
The thermal insulation effect of the coating was closely related to the content of the thermal insulation filler, but too much filler would cause interfacial compatibility problems of various substances in the coating, micro-defects in the coating, and affect the anti–corrosion performance of the coating. Therefore, solving the interface problem was the key to preparing a coating with heat insulation and anticorrosion functions. In this study, organic–inorganic hybrid polymer was used to modify the surface of vacuum ceramic microbeads, and epoxy–silicone resin was used as the film–forming material to prepare a heat-insulating and anticorrosive coating that can withstand 200 °C. The SEM morphology showed that the interface compatibility of the vacuum ceramic beads modified by the organic–inorganic hybrid agent and the film-forming material were improved, the dispersibility was significantly improved, and the beads were tightly arranged; the thermal conductivity of the coating reached 0.1587 W/(m·K), which decreased by 50% after adding 20% ceramic beads, ANSYS finite element simulation showed that the coating has good thermal insulation performance; after the coating underwent a thermal aging test at 200 °C for 600 h, the microstructure was dense, and the low-frequency impedance modulus was still around 109 Ω·cm2. There was no obvious defect in the microstructure after the alternating cold and heat test for 600 h; the low-frequency impedance modulus was still above 108 Ω·cm2, and the low-frequency impedance modulus of the coating was 1010 Ω·cm2 after the 130d immersion test, indicating that the coating had good heat resistance and anti-corrosion performance.
Highlights
Publisher’s Note: MDPI stays neutralMuch equipment, such as petrochemical industry and thermal pipelines, have been in service at approximately 150 ◦ C
The work of thermal insulation coating focuses more on the research and development of thermal insulation coating and studies the influence of the type and content of thermal insulation filler on the thermal insulation performance of the coating [10,11,12]
The research on the interface modification of vacuum ceramic beads and the coating with thermal insulation and anti-corrosion performance is of great significance for petrochemical, thermal pipeline and other fields
Summary
Much equipment, such as petrochemical industry and thermal pipelines, have been in service at approximately 150 ◦ C. The work of thermal insulation coating focuses more on the research and development of thermal insulation coating and studies the influence of the type and content of thermal insulation filler on the thermal insulation performance of the coating [10,11,12] Microspheres, such as hollow glass microspheres and ceramic microspheres, have attracted with regard to jurisdictional claims in published maps and institutional affiliations. S. Montazeri et al [17] found that the coating has good thermal stability and thermal insulation effect when the content of glass microbeads was 7%, and the thermal conductivity of the coating dropped to 0.29 W/(m·K). The research on the interface modification of vacuum ceramic beads and the coating with thermal insulation and anti-corrosion performance is of great significance for petrochemical, thermal pipeline and other fields. The surface of vacuum ceramic beads was modified with a self-made organic–inorganic hybrid agent, and the changes of vacuum ceramic bead coating structure before and after modification were analyzed by scanning electron microscope; through thermal conductivity test and ANSYS software to explore the thermal insulation performance of the coating; the micro-morphology, adhesion and EIS changes of the coating after being subjected to environmental tests under different conditions were tracked, and the thermal resistance and anti-corrosion performance of the coating were analyzed
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