| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font
First page > Show document

Show document Help

Title: MATEMATIČNI MODELI ZA DOLOČITEV VPLIVA PROCESNIH PARAMETROV NA FIZIKALNO-KEMIJSKE LASTNOSTI SEČNINSKO-FORMALDEHIDNIH SMOL
Authors:ID Duh, Simona (Author)
ID Kovač Kralj, Anita (Mentor) More about this mentor... New window
ID Novak-Pintarič, Zorka (Comentor)
ID Kotnjek, Helena (Comentor)
Files:.pdf VS_Duh_Simona_2011.pdf (1,77 MB)
MD5: FFF41FCEB8C08A6BCFDE0B4FFA3C7F1D
PID: 20.500.12556/dkum/96e380e3-e535-460d-81df-40af9fcb51a3
 
Language:Slovenian
Work type:Undergraduate thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V razvojnem laboratoriju podjetja Nafta Petrochem d.o.o. iz Lendave smo pripravljali sečninsko-formaldehidne smole. V laboratoriju smo po standardnih metodah izvedli tudi vse potrebne analize. Določili smo najpomembnejše parametre in njihove vrednosti, ki bi zagotavljali nespremenjeno kvaliteto smole glede na pretečeni čas po sintezi smole in pri različnih dodatkih sečnine. Med raziskavami smo opazovali čas kondenzacije in ugotovili, da dodatki sečnine vplivajo na hitrost reakcije kondenzacije med sečnino in formaldehidom. Če več sečnine sodeluje v kondenzaciji, moramo povišati pH vrednosti reakcijske mešanice in znižati temperaturo kondenzacije, da dosežemo enake čase kondenzacije. Ugotovili smo, da ne glede na način sinteze (mišljeni so različni premiki dodatkov sečnine iz enega dodatka v drugega), trajanja časa reakcije kondenzacije in končne viskoznosti ima stabilizirana smola po enem tednu in ob različnih premikih med tremi dodatki sečnine, takšne vrednosti, ki so znotraj napake metode. Določili smo tudi matematične modele z linearno in nelinearno regresijo za določitev vpliva procesnih parametrov na fizikalno-kemijske lastnosti sečninsko-formaldehidnih smol, ki se zelo ujemajo z realnimi meritvami (saj je determinacijski koeficient, R2, blizu vrednosti 1).
Keywords:sečninsko-formaldehidne smole, določanje parametrov, matematični model
Place of publishing:Maribor
Publisher:[S. Duh]
Year of publishing:2011
PID:20.500.12556/DKUM-17334 New window
UDC:66.01:678.652(043.2)
COBISS.SI-ID:15165718 New window
NUK URN:URN:SI:UM:DK:D2SXZTA2
Publication date in DKUM:28.01.2011
Views:3191
Downloads:129
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
:
DUH, Simona, 2011, MATEMATIČNI MODELI ZA DOLOČITEV VPLIVA PROCESNIH PARAMETROV NA FIZIKALNO-KEMIJSKE LASTNOSTI SEČNINSKO-FORMALDEHIDNIH SMOL [online]. Bachelor’s thesis. Maribor : S. Duh. [Accessed 24 April 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=17334
Copy citation
  
Average score:
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
(0 votes)
Your score:Voting is allowed only for logged in users.
Share:Bookmark and Share



Similar works from other repositories:
  1. Gozdni proizvodi
  2. Gozdna ekologija in nega
Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Secondary language

Language:English
Title:MATHEMATICAL MODELS FOR DETERMINING THE INFLUENCE OF PROCESS PARAMETERS ON THE PHYSICO-CHEMICAL PROPERTIES FOR UREA-FORMALDEHYDE RESINS
Abstract: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).
Keywords:urea-formaldehyde resin, determination of parameters, a mathematical model


Comments

Leave comment

You must log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica