Izpis gradiva

Naslov:	MATEMATIČNI MODELI ZA DOLOČITEV VPLIVA PROCESNIH PARAMETROV NA FIZIKALNO-KEMIJSKE LASTNOSTI SEČNINSKO-FORMALDEHIDNIH SMOL
Avtorji:	Duh, Simona (Avtor) Kovač Kralj, Anita (Mentor) Več o mentorju... Novak Pintarič, Zorka (Komentor) Kotnjek, Helena (Komentor)

Osnovno Sekundarni jezik Kazala Viri Spletni naslovi

Jezik:	Angleški jezik
Naslov:	MATHEMATICAL MODELS FOR DETERMINING THE INFLUENCE OF PROCESS PARAMETERS ON THE PHYSICO-CHEMICAL PROPERTIES FOR UREA-FORMALDEHYDE RESINS
Opis:	Urea-formaldehyde resins were prepared in the development laboratory of Nafta Petrochem d.o.o. company in Lendava. In the laboratory, necessary analyses were performed using standard methods. Main parameters and their values that would ensure stable quality of resin, regarding the passage of time after synthesis and various movements of urea were determined. During the studies, we observed the condensation time and found that the movement of urea influences the rate of condensation reaction between urea and formaldehyde. When higher quantity of urea participates in the condensation, pH of the reaction mixture should be increased and condensing temperature should be lowered to obtain the same time of condensation. We found that irrespective of the mode of synthesis (that means different movements of urea additives from one additive to another), the duration of the condensation reaction time and final viscosity of the resin, values of the resin stabilized after a week and after various shifts between the three additions of urea, are within the error of the method. We have determined the mathematical models using linear and nonlinear regression to determine the influence of process parameters on the physico-chemical properties for urea-formaldehyde resins, which are very consistent with real measurements (the coefficient of determination, R2, is close to 1).
Ključne besede:	urea-formaldehyde resin, determination of parameters, a mathematical model

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