Abstract
Silicone and pure organic binders were used to develop FAU-type zeolite coatings applied on pre-treated aluminum substrates by using a spraying method and then cured under specific conditions. The influence of the amount of binder on adhesion properties of zeolite coatings was first investigated to determine the optimum ratio between zeolite and binder. Zeolite coatings were then elaborated with a high zeolite content (between 70 and 80 wt.%) to ensure high adsorption capacities. The amount of binders involved in different zeolite coatings was sufficient to achieve interesting adhesion and cohesion properties. The accessibility of zeolite microporosity was studied by nitrogen adsorption-desorption measurements, which revealed a very small or no loss of the micropore volume for the optimized coatings. Volatile Organic Compounds (VOCs) adsorption measurements were carried out using n-hexane as probe molecule. FAU-type zeolite in powder form adsorbs 180 mg/ganhydrous zeolite, whereas the amounts of n-hexane adsorbed by zeolite coatings ranged from 131 to 175 mg/ganhydrous zeolite.
Highlights
Silicone resins are used in various applications since they have been discovered by Eugene G.Rochow in 1941 [1]
The good crystallization rate of FAU 13X zeolite is confirmed by nitrogen adsorption-desorption isotherms of type I characteristics of microporous materials according to the International Union of Pure and Applied
Cross-cut tests showed that adhesion properties are very interesting despite the small amount of binder used in zeolite coatings
Summary
Silicone resins are used in various applications since they have been discovered by Eugene G.Rochow in 1941 [1]. They consist of a framework Si-O-Si where organic groups are bonded to the silicon atom [2] Due to their high thermal stability in comparison with common organic polymers made with carbon-carbon bonds [3], silicone resins are of particular interest for high-temperature applications [4,5,6,7]. They are stable at temperatures up to 250 ◦ C over a long period. These properties make silicone resins very interesting candidates for the space industry where the temperature can vary between −110 and 150 ◦ C under orbital conditions [10]
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