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Title:SINTEZA UREAFORMALDEHIDNE SMOLE - DOLOČANJE VPLIVA PROCESNIH PARAMETROV NA KVALITETO PRODUKTA
Authors:ID Posavec, Doris (Author)
ID Goršek, Andreja (Mentor) More about this mentor... New window
Files:.pdf UNI_Posavec_Doris_2009.pdf (592,04 KB)
MD5: 4D9913C33249A23CC805413C8F2D2F68
PID: 20.500.12556/dkum/0573fcbe-87c6-46f9-abaf-9d194332e2b9
 
Language:Slovenian
Work type:Undergraduate thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Proizvajalci ivernih ter drugih plošč se ves čas soočajo z novimi izzivi. Izboljšati je namreč potrebno kakovost proizvodov, tako se dovoljena vsebnost emisijskega formaldehida v smolah znižuje, saj je le—ta zdravju škodljiv. Razvoj smol gre v tej smeri. Dovoljeno vsebnost emisijskega formaldehida določajo emisijski razredi. Trenutno sta v veljavi emisijski razred E—1 in ½ E—1. E—1 dovoljuje maksimalno 8 mg prostega formaldehida na 100 g plošče in povprečno 6,5 mg polletno. ½ E—1 dovoljuje 4 mg formaldehida na 100 g plošče. V diplomskem delu smo določili najpomembnejše parametre in njihove vrednosti, ki bi zagotavljali nespremenjeno kvaliteto smole. Spremljali smo obstojnost in reaktivnost smol ter določili najprimernejši zadrževalni čas. Raziskali smo, ali ima staranje predkondenzata vpliv na čase želiranja in vsebnost prostega formaldehida, ki sta za nas najpomembnejša parametra. Prav tako smo raziskali vpliv staranja smole. V ta namen smo kondenzirali smolo pri dveh različnih zadrževalnih časih in sicer pri 55 in skrajšanem 45 minutnem zadrževalnem času.
Keywords:ureaformaldehidne smole, obstojnost, emisija prostega formaldehida, zadrževalni čas.
Place of publishing:Maribor
Publisher:[D. Posavec]
Year of publishing:2009
PID:20.500.12556/DKUM-11883 New window
UDC:661.727.1:678.6(043.2)
COBISS.SI-ID:14053142 New window
NUK URN:URN:SI:UM:DK:AXZKH9HH
Publication date in DKUM:22.12.2009
Views:3000
Downloads:259
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Secondary language

Language:English
Title:SYNTHESIS OF UREA FORMALDEHYDE RESIN - DETERMINATION OF PROCESS PARAMETERS INFLUENCE ON PRODUCT QUALITY
Abstract:Manufacturers of particleboards are confronting with new challenges. The quality of products must be improved. The allowed content of emission formaldehyde in resins is decreasing, since it is unwholesome. The development of resins goes in this direction. The allowed content of formaldehyde in resins are determined with emission class. Momentarily E–1 and ½ E–1 are current. E–1 allows maximum 8 mg of free formaldehyde per 100 g of particleboard and on average 6,5 mg half-yearly. ½ E–1 allows 4 mg of formaldehyde per 100 g of particleboard. In the diploma work we have estimated the most important parameters which have an influence on resin quality and their values. We followed its existency and reactiveness and we also established appropriate holding time. We have examined the influence of raw materials ageing on the gelation time and ureaformaldehyde content. We have also examined the influence of resin ageing. For this reason we have condensed resin at two different holding times, 55 and 45 minutes, respectively.
Keywords:ureaformaldehyde resins, existency, formaldehyde emission, holding time.


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