Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD OF OBTAINING A UREA-PHENOL-FORMALDEHYDE BINDING AGENT FOR MOULD MATERIALS
Document Type and Number:
WIPO Patent Application WO/1980/000254
Kind Code:
A1
Abstract:
A method of obtaining a urea-phenol-formaldehyde binding agent for mould materials whereby urea and formaldehyde taken at a mole ratio of 1:(1.9-2.1) are heated at a pH of 6.5-8.0 up to a temperature of 80-100 C and kept at that temperature for 20-40 minutes, then an acidic catalyst is introduced until the pH value of 4.2-4.7 is reached, after which, following a pause of 15-30 minutes, the pH value is raised to 6.5-8.0 and phenol and formaldehyde are introduced until the mole ratio of (0.25-0.4):1:(2.5-2.7) between phenol, urea and formaldehyde, respectively, is reached and then, after a pause of 40-60 minutes at a temperature of 85-90 C and at a pH of 7.5-9.0 the reaction mass is vacuum dried up to the index of refraction of 1.468-1.472, urea is added until the mole ratio of (0.2-0.3):1:(1.8-2.2) between phenol, urea and formaldehyde, respectively, is reached and, finally after being kept for 20-40 minutes at a temperature of 55-65 C the reaction mass is cooled.

Inventors:
SNULOVA L (SU)
YUDINA G (SU)
ZHUKOVSKY S (SU)
GERASIMOVA V (SU)
SVITKINA M (SU)
TSYRZLEVA A (SU)
DORIN Y (SU)
MINKIN E (SU)
Application Number:
PCT/SU1979/000043
Publication Date:
February 21, 1980
Filing Date:
July 02, 1979
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
N PROIZ OB TEKHN MASHIN (SU)
SNULOVA L (SU)
YUDINA G (SU)
ZHUKOVSKY S (SU)
GERASIMOVA V (SU)
SVITKINA M (SU)
TSYRZLEVA A (SU)
DORIN Y (SU)
MINKIN E (SU)
International Classes:
C08G12/40; B22C1/22; C08G14/08; (IPC1-7): C08G12/40
Foreign References:
US3427284A1969-02-11
SU446523A11974-10-15
Download PDF: