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Polymer Binder BioCo3 with Silicates and its Application to Microwave-Cured Moulding Sand

Grabowska B., Kaczmarska K., Bobrowski A., Drożyński D., Żymankowska-Kumon S., Cukrowicz S.

Archives of Foundry Engineering

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2017

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Vol. 17, iss. 4

51--60

EN

The effects of silica additive (Poraver) on selected properties of BioCo3 binder in form of an aqueous poly(sodium acrylate) and dextrin (PAANa/D) binder were determined. Based on the results of the thermoanalytical studies (TG-DTG, FTIR, Py-GC/MS), it was found that the silica additive results in the increase of the thermostability of the BioCo3 binder and its contribution does not affect the increase in the level of emissions of organic destruction products. Compounds from group of aromatic hydrocarbons are only generated in the third set temperature range (420-838°C). The addition of silicate into the moulding sand with BioCo3 causes also the formation of a hydrogen bonds network with its share in the microwave radiation field and they are mainly responsible for maintaining the cross-linked structures in the mineral matrix system. As a consequence, the microwave curing process in the presence of Poraver leads to improved strength properties of the moulding sand […]. The addition of Poraver's silica to moulding sand did not alter the permeability of the moulding sand samples, and consequently reduced their friability. Microstructure investigations (SEM) of microwave-cured samples have confirmed that heterogeneous sand grains are bonded to one another through a binder film (bridges).

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Badanie produktów sieciowania poli(3-metylo-3-nitroksymetylooksetanu)

Szala M., Cichoń M.

Chemik

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2015

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Vol. 69, nr 3

129--135

PL

Poli(3-metylo-3-nitroksymetylooksetan) (poliNIMMO) sieciowano w masie za pomocą difunkcyjnego izocyjanianu stosując różne modyfikatory (poliole), katalizator cynoorganiczny, prowadząc reakcję w temperaturze 60 ºC i 80ºC. Otrzymane produkty sieciowania badano technikami: magnetycznego rezonansu jądrowego (NMR) oraz DTA/TG. Zależnie od zastosowanego inicjatora i ilości izocyjanianu uzyskiwano produkty o różnych właściwościach reologicznych. Temperatury rozkładu produktów sieciowania otrzymanych w różnych warunkach, były zbliżone i wynosiły ok. 200 ºC.

EN

Poly(3-methyl-3-nitroxymethyloxetane) (polyNIMMO) are readily cured by means of uretane chemistry in presence of additives like polyols, catalyst (dibutyltin dilaurate). Reactions were carried out in nitrogen atmosphere at 60°C and 80°C. Cured products were investigated by using nuclear magnetic resonance (NMR) and differential thermal analysis (DTA). Depending on the polyol used and the amount of isocyanate, obtained products are different rheological properties. Decomposition temperatures of products cured in different conditions are similar and equal about 200°C.

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Preparation of network π-conjugated copolymers with Ullmann type polycondensation

Nakajima K., Goto H.

International Letters of Chemistry, Physics and Astronomy

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2014

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Vol. 6

33--38

EN

Ullmann type polycondensations in the presence of CuI and a base were carried out to afford network type π-conjugated copolymers. Infrared absorption spectroscopy measurements and surface observation using a scanning electron microscopy are carried out. Electron spin resonance spectroscopy measurements revealed that the cross-linked copolymers thus obtained contain small amount of copper. This polymerization conveniently allows production of network π-conjugated polymers. The polymer can be expected to have thermo-resistance.

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Badania nad zagospodarowaniem odpadów chemicznie sieciowanego polietylenu komórkowego

Szulc R., Kudła S., Barton J.

Przemysł Chemiczny

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2013

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T. 92, nr 10

1802-1807

PL

Odpadową piankę z polietylenu sieciowanego poddano obróbce termomechanicznej w celu zniszczenia jej struktury komórkowej. Do takiego materiału wprowadzano wybrane poliolefiny pierwotne, otrzymując mieszanki o dobrych właściwościach przetwórczych, które zostały użyte jako składniki tworzyw przeznaczonych do wytwarzania sieciowanych tworzyw porowanych. Stwierdzono, że w niektórych przypadkach możliwe jest użycie sieciowanego odpadu do wytwarzania wyrobów porowanych o bardzo dobrych właściwościach.

EN

Cross-linked polyethylene foam waste was thermomech. degraded and blended with virgin polyolefins in a kalender or rheomixer at 150°C. The blends were foamed with azodicarbonamide and crosslinked with (PhCMe2O)2 at 220°C and studied for tensile strength, elongation at break and melt flow index. The addn. of blends did not result in any substantial deterioration of the foam properties.