UREA-FORMALDEHYDE RESIN PRODUCTION PROCESS

UREA-FORMALDEHYDE RESIN PRODUCTION PROCESS

FIELD: polymer production. ^ SUBSTANCE: invention, in particular, relates to production of urea-formaldehyde resins widely used in wood-working industry. Process according to invention is implemented via condensation of urea-formaldehyde concentrate with urea on heating first in neutral or low-alkal...

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Hauptverfasser: LEONT'EV SERGEJ PAVLOVICH, EROFEEV VLADIMIR IVANOVICH, GORNOSTAEV VIKTOR VIKTOROVICH, ALEKSEEV VJACHESLAV EVGEN'EVICH, SHISHOV ANATOLIJ VIKTOROVICH, KONDRASHKIN PETR NIKOLAEVICH, KURENEV SERGEJ VLADIMIROVICH, DIMITROV ALEKSANDR MIKHAJLOVICH
Format: Patent
Sprache:eng ; rus
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CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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creator LEONT'EV SERGEJ PAVLOVICH
EROFEEV VLADIMIR IVANOVICH
GORNOSTAEV VIKTOR VIKTOROVICH
ALEKSEEV VJACHESLAV EVGEN'EVICH
SHISHOV ANATOLIJ VIKTOROVICH
KONDRASHKIN PETR NIKOLAEVICH
KURENEV SERGEJ VLADIMIROVICH
DIMITROV ALEKSANDR MIKHAJLOVICH
description FIELD: polymer production. ^ SUBSTANCE: invention, in particular, relates to production of urea-formaldehyde resins widely used in wood-working industry. Process according to invention is implemented via condensation of urea-formaldehyde concentrate with urea on heating first in neutral or low-alkaline medium and then in acidic medium in presence of catalytic additive composed of formaldehyde, sodium hydroxide, and sulfuric acid at molar ratio 1.0:(0.4-0.5):(0.1-0.3), respectively, followed by co-condensation of formed product with additional amount of urea in neutral or low-alkaline medium at initial and final urea-to-formaldehyde molar ratios 1.0:(1.9-2.1) and 1.0:(1.1-1.6), respectively. Action of impurities in urea-formaldehyde concentrate and urea is neutralized with sodium hydroxide solution until pH of mixture 6.0-8.0 is attained. Stabilization of pH of reaction mixture is achieved by using catalytic additive in amount 0.1-0.3% of the weight of initial formaldehyde in urea-formaldehyde concentrate. ^ EFFECT: simplified technology with high principal characteristics of resins preserved. ^ 3 cl, 1 tbl, 4 ex
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subjects CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
title UREA-FORMALDEHYDE RESIN PRODUCTION PROCESS
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