Menjava metode določanja optičnih lastnosti pigmentnega titanovega dioksida

diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje

Tomaž Zupanc (Avtor), Matjaž Kristl (Mentor), Irena Ban (Komentor), Mojca Pustoslemšek (Komentor)

Povzetek

Namen diplomske naloge je bil uvesti novo metodo določevanja optičnih lastnosti pigmentnega titanovega dioksida, ki jih opisujemo z močjo posvetlitve in podtonom. Meritve moči posvetlitve in podtona pigmetnega titanovega dioksida izvajajo v Kontroli proizvodnih procesov, v postopku kalcinacije, z namenom optimalnega vodenja postopka, ki ima v procesu proizvodnje pigmentnega titanovega dioksida velik vpliv na kakovost pigmenta. Moč posvetlitve pigmenta podajajo kot vrednosti Y % v sivi pasti in podton kot vrednost YF % v sivi pasti. Obstoječa metoda je dolgotrajna. Pred spektrofotometrično določitvijo moči posvetlitve in podtona pigmenta po kalcinaciji moramo pripraviti sivo pasto, ki vsebuje pigment, laneno olje in mešanico za sivi pasto. Kalcinatu pomletem z laboratorijskim mlinom je potrebno dodati laneno olje in mešanico za sivo pasto, ki vsebuje BaCO3 ter saje, ki imajo moder podton. Pigment in sestavine sive paste se vribajo na vribalnen stroju, nastala pasta se stisne v tableto, ki ji s spektrofotometrom izmerimo vrednosti X, Y in Z. Ker sta moč posvetlitve (Y %) in podton (YF %) kalcinata relativni vrednosti, se primerjajo vrednosti X, Y in Z trenutnega vzorca kalciniranega pigmenta z vrednostmi X, Y in Z standardnega vzorca. Pasta standardnega vzorca se pripravi in izmeri na enak način kot pasta trenutnega vzorca kalciniranega pigmenta. Nova metoda določevanja optičnih lastnosti pigmentnega titanovega dioksida temelji na spektrofotometrični določitvi transmisije svetlobe v vidnem delu spektra dnevne svetlobe. Vzorec kalciniranega pigmenta pomlet z laboratorijskim mlinom omočimo z organskim omakalom s pomočjo hitrovrtečega mešala. Homogeni disperziji izmerimo s spektrofotometrom transmisijo svetlobe pri različnih valovnih dolžinah, ki jo preračunamo v optično gostoto (OD). Optično gostoto kalciniranega pigmenta primerjamo z optično gostoto standardnega vzorca pigmenta, ki je pripravljen na enak način kot trenutni vzorec kalciniranega pigmenta. V diplomskem delu so prikazane meritve moči posvetlitve in podtona pigmentnega titanovega dioksida v vzorcih iz postopka kalcinacije po stari in novi metodi. Na osnovi statistične obdelva rezultatov meritev so pokazali, da se meritve po novi metodi, pri 450 nm vidne svetlobe, ujemajo z meritvami po stari metodi.

Ključne besede

siva pasta;podtoni;rečlativna moč razprševanja;svetlost;realtivni razprševalni koeficient;diplomske naloge;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2018
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Založnik:	[T. Zupanc]
UDK:	549.514.6(043.2)
COBISS:	21961750
Št. ogledov:	814
Št. prenosov:	82
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Replacement of the method for determining optical properties of titanium dioxide pigment
Sekundarni povzetek:	The purpose of the thesis was to introduce a new method for determining the optical properties of pigmented titanium dioxide, which is described by the lightening power and undertone. Measurements of the lightening power and the undertone of pigmented titanium dioxide are carried out in the Control of Production Processes, in the process of calcination, in order to optimally manage the process, which has a significant influence on the quality of the pigment in the process of production of pigmented titanium. The lightening power of the pigment is given as Y % values in the gray paste and undertone as the value of YF % in the gray paste. The existing method is long-lasting. Before the spectrophotometric determination of the lightening power and undertone of the pigment after calcination, a gray paste containing pigment, linseed oil and a mixture of gray paste must be prepared. It is necessary to add the calcinate mixed with a laboratory mill to linseed oil and a mixture of gray paste containing BaCO₃ and soot, which have blue undertone. The pigment and the ingredients of the gray paste are sculpted on the rolling machine, the resulting paste is compressed into a tablet, which is measured with the spectrophotometer, values X, Y and Z. Since the lightening power (Y %) and the undertone (YF %) of calcite are relative values, values of X, Y and Z of the current sample of calcined pigment are compared with values of X, Y and Z of the standard sample. The standard sample paste is prepared and measured in the same way as the paste of the current sample of calcined pigment. The new method for determining the optical properties of pigmented titanium dioxide is based on the spectrophotometric determination of the transmission of light in the visible part of the daylight spectrum. A sample of calcined pigment mixed with a laboratory mill is wetted with an organic dispergant by means of a quick-action stirrer. The homogeneous dispersion is measured with a spectrophotometer by transmitting light at different wavelengths, which is converted to optical density (OD). The optical density of the calcined pigment is compared with the optical density of the standard pigment sample, which is prepared in the same way as the current sample of calcined pigment. The thesis presents the measurements of the lightening power and the undertone of pigmented titanium dioxide in samples from the calcination process according to the old and the new method. Based on the statistical processing of the results of the measurements, it has been shown that the measurements according to the new method, at 450 nm of visible light, coincide with the measurements of the old method.
Sekundarne ključne besede:	gray paste;suspension;undertone;brightness;lightening power;relative scattering efficiency;realtive scattering coefficients;
URN:	URN:SI:UM:
Vrsta dela (COBISS):	Diplomsko delo/naloga
Komentar na gradivo:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Strani:	X, 39 str.
ID:	10956678