STUDY
CONCERNING THE SETTING OF UREA-FORMALDEHIDE RESIN
TYPE URELIT S
Part 1: Setting at temperature of 1000C
Valeriu PETROVICI
Prof.Dr.Eng.- "Transilvania" University
of Brasov - Faculty of Wood Industry
Address: B-dul Eroilor nr.29, 500036 Brasov, Romania
Tel/Fax: +40 268 412921/int.166.
E-mail: petrovic@unitbv.ro
Mirela Elena VASILE
Drd/PhD.Student - "Transilvania" University
of Brasov - Faculty of Wood Industry
Address: B-dul Eroilor nr.29, 500036 Brasov, Romania
Tel/Fax: +40 268 412921/int.166.
E-mail: myry1219@yahoo.com
Ileana BORZEA
Eng.chim. - SC Viromet SA - Victoria Brasov
Address: Str. Aleea Uzinei nr. 8, 505700 Victoria,
Brasov, Romania
Tel.: +40 268 241120. Fax: +40 268 242484.
E-mail: techndir@viromet.ro
Octavia ZELENIUC
Lecturer.Dr.Eng.- "Transilvania" University
of Brasov - Faculty of Wood Industry
Address: B-dul Eroilor nr.29, 500036 Brasov, Romania
Tel/Fax: +40 268 412921/int.166.
E-mail: zoctavia@unitbv.ro
Abstract:
This paper presents the experimental results based
on the researches carried out in the laboratory
phase, concerning the jellification at temperature
of 1000C of a new synthetic resin, named urea-formaldehyde
resin URELIT S type, produced and sold by SC VIROMET
SA VICTORIA Company.
This study used as reference products the resins
type URELIT PN and ADEZIV G, both produced by
the same company; these products are usually used
for hot gluing of different wooden products. For
this purpose various catalyst in different amounts
were added as salts and acids, both in solid state
and aqueous solutions.
The jellification time at 1000C for the new resin
UF URELIT S type is shorter than that for the
reference products despite it solids content is
reduced with 50%.
For the new resin it can be obtained a jellification
time of maximum 60 seconds at 1000C (accepted
for the reference resins) by adding 1% of oxalic
acid, 3% ammonium chloride, or 8% ammonium sulphate
both in solid state. The same effect could be
obtained by using additives like: 10% ammonium
chloride, or oxalic acid solutions with the concentrations
of about 15% and 10% respectively, as well as
sulphuric acid and chlorine hydride 15% concentrations.
Key word: urea- formaldehyde
resins URELIT S, URELIT PN and ADEZIV G, reactivity
GT.
|