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2021, br. 31, str. 125-136
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Karakterizacija izolacionih papira primenom FTIR-ATR spektroskopije
Characterization of insulation papers using FTIR-ATR spectroscopy
Ključne reči: transformator; čvrsta papirna izolacija; termički nadograđen papir; FTIR-ATR spektroskopija
Keywords: power transformer; solid paper insulation; thermally upgraded paper; FT-ATR spectroscopy
Sažetak
Potreba za povećanjem produktivnosti i kapaciteta energetskih transformatora uslovila je proizvodnju izolacionih papira više termičke klase. U tu svrhu se primenjuju najrazličitije tehnike modifikacije čvrste izolacije koje omogućavaju povećanje termičke i hemijske stabilnosti izolacionog papira tokom eksploatacije transformatora. Dodatak aditiva, pre svega dicijandiamida (DICY) i poliakrilamida (PAM), predstavlja jedan od oblika modifikacije celuloze u završnim fazama proizvodnje papira. Značajnu razliku među papirima predstavlja sadržaj azota u papiru koji karakteriše dodavanje aminskih jedinjenja (aditiva). U radu je prikazana primena infracrvene spektroskopije sa totalno oslabljenom refleksijom (FTIR-ATR) u karakterizaciji uzoraka papira kao i uočavanju razlika između običnog kraft i termički nadograđenog papira koja se ogleda u prisustvu ili odsustvu karakterističnih funkcionalnih grupa za aditive. Identifikacijom traka na 2194-2154 cm-1 potvrđeno je prisustvo aditiva dicijandiamina (DICY) u spektru uzorka termički nadograđenog papira što predstavlja razliku u odnosu na spektar običnog kraft papira.
Abstract
The need to increase the productivity and capacity of power transformers has conditioned the production of insulating papers of a higher thermal class. For this purpose, various techniques of solid insulation modification were applied, which enable the increase in thermal and chemical stability of the insulating paper during the operation of the transformer. The applied additives, primarily dicyandiamide (DICY) and polyacrylamide (PAM), are one form of cellulose modification in the final stages of paper production. A significant difference between the papers is the nitrogen content in the paper, which is characterized by the addition of amine compounds (additives). The paper presents the application of infrared spectroscopy with totally attenuated reflection (FTIR-ATR) in the characterization of paper samples. The aim is to observe the difference between regularly kraft and thermally upgraded paper reflected in the presence or absence of characteristic functional groups for additives. The strip identification at 2194-2154 cm-1 confirmed the presence of dicyandiamide additives (DICY) in the spectrum of the sample of thermally upgraded paper, which is different compared with the spectrum of regular kraft paper.
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*** Kappa number of pulp TAPPI/ANSI T 236 om-13
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