Zastosowanie promieniowania mikrofalowego do sieciowania układu poli(akrylan sodu)/żel krzemionkowy stosowanego jako spoiwo w masach odlewniczych

B. Grabowska; M. Holtzer

Published : 2022-08-26

Vol. 52 No. 11-12 (2007)

Application of microwave radiation for crosslinking of sodium polyacrylate/silica gel system used as a binder in foundry sands

B. Grabowska M. Holtzer

Abstract

It was proved experimentally that microwave radiation caused crosslinking of sodium polyacrylate (PAS) / silica gel system, treated in this work as a model molding sand of the type polyacrylate (polymeric binder) / quartz sand (loose matrix). The results of Raman and FT-IR spectroscopic measurements are the base of proposed mechanism of the crosslinking process investigated. According to it, chemical adsorption activated with microwaves plays a significant role. The chemical adsorption leads to formation of strong hydrogen bonds [see equation (1)] or covalent ones [of anhydride type or -C (O)-O-Si, see equations (2) and (3)] PAS - silica. It favors an improvement in tensile properties in comparison with the properties of molding sands hardened traditionally with Ca(OH)2 and CO2. Additional advantages of the hardening method described, with use of microwaves, are short time (90s) and relatively low temperature (150°C) of the process.

Keywords

masy formierskie ; poliakrylany ; żel krzemionkowy ; utwardzanie mikrofalami ; spektroskopia FTIR ; spektroskopia Ramana ; mechanizm sieciowania molding sands ; polyacrylates ; silica gel ; hardening with microwaves ; FTIR spectroscopy ; Raman spectroscopy ; crosslinking mechanism

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Grabowska, B., & Holtzer, M. (2022). Application of microwave radiation for crosslinking of sodium polyacrylate/silica gel system used as a binder in foundry sands. Polimery, 52(11-12), 841–847. Retrieved from https://polimery.ichp.vot.pl/index.php/p/article/view/1479

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