Epoxy/oil micro-bead lubricating heat-resistant coating based on opening valve

Li, Mengyu; Liu, Ning; Li, Qiaoling

doi:10.1016/j.porgcoat.2019.03.053

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…The properties of the final product depend on the type of material used to produce the porous micro-beads [ 5 ]. Among the porous microbead materials, polymers dominate in many applications, including structural, automotive, electronics, and biomedical applications [ 6 , 7 , 8 ], as polymer-based micro-beads are inexpensive, and offer excellent thermal expansion and ease of fabrication [ 9 , 10 ]. Currently, porous epoxy micro-beads are being continuously explored by researchers due to their excellent mechanical and thermal properties, and superior chemical resistance due to the three-dimensional crosslinks formed by the reaction between epoxy and polyamide [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Development of Porous Epoxy Micro-Beads Using Ammonium Bicarbonate through a Single Epoxy Droplet in Corn Oil

et al. 2021

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This paper explored the effects of ammonium bicarbonate and different ratios of epoxy to polyamide on the formation of porous epoxy micro-beads through a single epoxy droplet. A single drop of a mixture, consisting of epoxy, polyamide, and ammonium bicarbonate, was dropped into heated corn oil at a temperature of 100 °C. An epoxy droplet was formed due to the immiscibility of the epoxy mixture and corn oil. The ammonium bicarbonate within this droplet underwent a decomposition reaction, while the epoxy and polyamide underwent a curing reaction, to form porous epoxy micro-beads. The result showed that the higher ammonium bicarbonate content in the porous, epoxy micro-beads increased the decomposition rate up to 11.52 × 10−3 cm3/s. In addition, a higher total volume of gas was generated when a higher ammonium bicarbonate content was decomposed. This led to the formation of porous epoxy micro-beads with a smaller particle size, lower specific gravity, and better thermal stability. At an epoxy to polyamide ratio of 10:6, many smaller micro-beads, with particle sizes ranging from 201 to 400 μm, were obtained at an ammonium bicarbonate content of 10 phr. Moreover, the porous epoxy micro-beads with open pores were shown to have a low specific gravity of about 0.93 and high thermal stability at a high ammonium bicarbonate content. Based on the findings, it was concluded that porous epoxy micro-beads were successfully produced using a single epoxy droplet in heated corn oil, where their shape and particle size depended on the content of ammonium bicarbonate and the ratio of epoxy to polyamide used.

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