The Effects of TDI on Selected Properties of Ester Epoxy Alkyd Varnish

Abstract

This article presents the effects of toluene diisocyanate (TDI) on electrical properties of ester epoxy alkyd varnish. Through testing on breakdown voltage, dielectric constant, block resistivity, Tang (Tg) dielectric loss, the electrical properties of varnish were investigated. When TDI amount increased from to 4 - 10 (w/100w of epoxy resin), the breakdown voltage increased from 21.78 to 65.69 KV/mm. With TDI of 8 - 10 w/w, the dielectric constant was the best, about 2.78 - 3.02. With TDI of 8 w/w, the block resistivity was 6.8.1014 W.cm and Tg dielectric loss was 0.0069. The article also presents the effect of TDI on solvent- and heat resistance of the varnish.

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“…4). Peaks of NCO and OH were found at 2245 cm −1 and 1328 cm −1 , respectively, 15,33 while HSSO hydroxyl group was observed at 3502 cm −1 . 33 After reaction of orcein and HSSO with TDI, both NCO and OH peaks disappeared rising new peaks in product.…”

“…Peaks of NCO and OH were at 2254 cm −1 and 1328 cm −1 respectively. 15,33,43 Appearance of these new peaks in Or-PU conrmed the synthesis of product as shown in Fig. 5.…”

“…Peaks at 3502 cm −1 and 2245 cm −1 in HSSO FTIR spectra, represent OH in HSSO and NCO in TDI, respectively. 33 Upon reaction of HSSO with TDI, disappearance of both OH and NCO peaks in product (Fig. 3) conrmed the consumption of these functional groups along with the formation of a new functional group C-O at 1054 cm −1 .…”

“…Peaks of NCO and OH were found at 2245 cm −1 and 1328 cm −1 , respectively, 15,33 while HSSO hydroxyl group was observed at 3502 cm −1 . 33 Aer reaction of orcein and HSSO with TDI, both NCO and OH peaks disappeared rising new peaks in product. It is assumed that polyols OH reacted with C]N in TDI, resulting in CO bond between TDI and polyol with peak at 1054 cm −1 .…”

“…43 Peak at 1533 cm −1 indicated the presence of cyclic alkenes. 33 Or-HSSO-PU sample along with ingredients was analyzed through FTIR (Fig. 4).…”