C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
403/55
C08L 61/24 (2006.01) C08J 9/28 (2006.01)
Patent
CA 1197649
Abstract The process for the production of a urea-formal- dehyde foamed plastic according to the present in- vention comprises preliminarily dispersing an aqueous solution of a urea-formaldehyde resin with a concentra- tion of more than 65% and a viscosity of up to 2,500 mPa.s at the temperature of 20°C by means of a compressed inert gas, whereafter the dispersed resin is introduced into a stream of a blowing foaming agent comprising an aqueous solution of a surfactant and an acid catalyst at the following ratio between the dispersed resin and the blowing curing agent: 1:(0.5-2.5) respectively, while as the surfactant use is made of salts of sulphonated alcohols of the general formula: MOSO3R, wherein: M is Na+, K+, NH4+, [(CH2CH2OH)3NH] +, R is a radical of alcohols of the aliphatic series with a number of carbon atoms of from 8 to 20, or triethanolamine salts of an alkylbenzenesulphonic acid.
417170
Boldina Ljudmila A.
Borodkina Nadezhda I.
Fadeeva Ljudmila V.
Kuryshin Jury A.
Shmelev Valery N.
Marks & Clerk
Vsesojuzny Nauchno-Issledovatelsky Institut Tsementnogo Mashinos
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