Urea formaldehyde

Bezeichnung:Urea formaldehyde

CAS-Nr9011-05-6

Englisch Name:Urea formaldehyde

CBNumberCB3277498

SummenformelC2H6N2O2

Molgewicht90.08

MOL-Datei9011-05-6.mol

Urea formaldehyde physikalisch-chemischer Eigenschaften

Dichte	1.200 g/cm3
storage temp.	-20°C
Dielectric constant	6.4（Ambient）
CAS Datenbank	9011-05-6(CAS DataBase Reference)
EPA chemische Informationen	Urea formaldehyde polymer (9011-05-6)

Sicherheit

R-Sätze:	36/37/38
S-Sätze:	26-36/37/39
Giftige Stoffe Daten	9011-05-6(Hazardous Substances Data)
Toxizität	LD50 oral in rat: 8394mg/kg

Gefahreninformationscode (GHS)

Urea formaldehyde Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
Verwenden
Urea formaldehyde is a textile-finish resin of formaldehyde type for treatment of e.g., cotton and rayon materials; in wood-glue industry.
Verwenden
Slow-release nitrogen fertilizer for turf grass.
Vorbereitung Methode
Urea-formaldehyde, a thermoset, is obtained by the condensation of urea [(NH2 )2 CO] or derivatives such as hydroxymethylurea and formaldehyde (HCHO) in the presence of a proper catalyst either basic or acid. The general equation of the first reaction is given below:
NH2 -CO-NH2 + HCHO → NH2 -CO-NH-CH2 OH + OHCH2 -NH-CO-NH-CH2 OH
A wide variety of urea-formaldehyde resins can be obtained by careful selection of the pH, reaction temperature, reactant ratio, amino monomer, and degree of polymerization. If the reaction is carried far enough, an infusible polymer network is produced. The condensation proceeds in several consecutive stages: First it yields a liquid and transparent resin easily soluble in organic solvents. Secondly, the condensation continues and the resin becomes easy to mold. Thirdly, upon heating, the resin hardens yielding a hard solid, non fusible and insoluble in organic solvents. Industrially, the condensation is maintained in the second state in order to be able to mold the resin easily. The major fillers consist of pure cellulose, caseine or cotton flocks, in order to not alter the whiteness. Once cured, urea-formaldehyde exhibits good mechanical and dielectric properties and good chemical resistance.
Origin
Urea-formaldehyde first appeared in 1929 in the USA as a substitute of glass for windows

Urea formaldehyde Upstream-Materialien And Downstream Produkte

Urea formaldehyde Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

9011-05-6, Urea formaldehyde Verwandte Suche:

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