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Polyurethane

Polyurethane Struktur
9009-54-5
CAS-Nr.
9009-54-5
Englisch Name:
Polyurethane
Synonyma:
PU foam;Polyurethane foam;PU Resin;polyurethane polymer;Polyisocyanurate resins;Andur;Curene;Etheron;Pliogrip;Nci-C56451
CBNumber:
CB1875782
Summenformel:
C3H8N2O
Molgewicht:
0
MOL-Datei:
Mol file

Polyurethane Eigenschaften

Stabilit?t:
Stable. Combustible. Incompatible with strong oxidizing agents.
InChI
InChI=1S/C3H8N2O/c1-2-5-3(4)6/h2H2,1H3,(H3,4,5,6)
InChIKey
RYECOJGRJDOGPP-UHFFFAOYSA-N
SMILES
N(CC)C(N)=O
CAS Datenbank
9009-54-5
IARC
3 (Vol. 19, Sup 7) 1987

Sicherheit

Polyurethane Chemische Eigenschaften,Einsatz,Produktion Methoden

Chemische Eigenschaften

Polyurethane foams are resistant to a wide range of solvents. In this respect, polyester foams are generally superior to polyether foams, particularly in resistance to dry cleaning solvents. Polyurethane foams are subject to degradation by aqueous acids and alkalis and steam. Ester, amide and urethane groups represent sites for hydrolytic attack. Since the ether group is not readily attacked, polyether foams are generally more resistant to hydrolysis than polyester foams.

Verwenden

Flexible polyurethane foams are open-cell structures which are usually produced with densities in the range 24-48 kg/m3 (1.5-3Ib/ft3). The major interest in flexible foams is for upholstery applications and thus the loadcompression characteristics are of importance.

synthetische

Polyurethane foams are produced by forming a polyurethane polymer concurrently with a gas evolution process. Provided these two processes are balanced, bubbles of gas are trapped in the polymer matrix as it is formed and a cellular product results. The matching of the two reactions is essential for the formation of satisfactory foams. If the evolution of gas is too rapid, the foam initially rises well but then collapses because polymerization has not proceeded sufficiently to give a matrix strong enough to retain the gas. If polymerization is too fast, the foam does not rise adequately.
By selection of appropriate reactants, it is possible to prepare foams of varying degrees of cross-linking. Slightly cross-linked products are flexible whilst highly cross-linked products are rigid. Both flexible and rigid polyurethane foams are of commercial importance.

Vorbereitung Methode

Castable polyurethane elastomers are fabricated from polyurethane prepolymers, which are obtained by reacting an excess of diisocyanate with high-molecular-weight diols. These NCO-terminated oligomers (prepolymers) are commercially available under a variety of trade names and in numerous types depending upon the types of diisocyanates and polyols that are used to synthesize them. The NCO content of these prepolymers can vary from less than 3% to as much as 20%. A cast polyurethane fabricator mixes these liquid prepolymers with approximately stoichiometric quantities of a curing agent (or a blend of curing agents) such as an appropriate low-molecular- weight diol or diamine.
Generally a prepolymer is heated to reduce its viscosity before mixing it with a liquid or a molten curing agent. The prepolymer curing agent blends have a limited working time (pot life) during which they are still liquid and can be poured into molds. The liquid prepolymer/curing agent blend is degassed and then poured into molds, which are often heated to expedite curing. After curing, the solid polyurethane elastomer articles are removed from the mold and are sometimes finished by keeping them at elevated temperature to complete the cure and to maximize mechanical properties.

Hazard

Evolves toxic fumes on ignition.

Sicherheitsprofil

Questionable carcinogen with experimental tumorigenic data. When heated to decomposition it emits acrid toxic fumes of CNand NOx.

Einzelnachweise

[1] Sonnenschein, M. “INTRODUCTION TO POLYURETHANE CHEMISTRY.” 2014. 0.

Polyurethane Upstream-Materialien And Downstream Produkte

Upstream-Materialien

Downstream Produkte


Polyurethane Anbieter Lieferant Produzent Hersteller Vertrieb H?ndler.

Global( 51)Lieferanten
Firmenname Telefon E-Mail Land Produktkatalog Edge Rate
Leading Chemical and Trading Co.,Ltd
+8615669938129
sales@leadingchemical.com China 130 58
Hebei Mojin Biotechnology Co., Ltd
+86 13288715578 +8613288715578
sales@hbmojin.com China 12835 58
Hebei Yanxi Chemical Co., Ltd.
+8617531190177
peter@yan-xi.com China 5857 58
Henan Tianfu Chemical Co.,Ltd.
+86-0371-55170693 +86-19937530512
info@tianfuchem.com China 21634 55
Cangzhou Wanyou New Material Technology Co.,Ltd
18631714998
sales@czwytech.com CHINA 904 58
Hubei xin bonus chemical co. LTD
86-13657291602
linda@hubeijusheng.com CHINA 22963 58
Shandong chuangyingchemical Co., Ltd.
18853181302
sale@chuangyingchem.com CHINA 5906 58
Chongqing Chemdad Co., Ltd
+86-023-6139-8061 +86-86-13650506873
sales@chemdad.com China 39894 58
SIMAGCHEM CORP
+86-13806087780
sale@simagchem.com China 17365 58
Hefei TNJ Chemical Industry Co.,Ltd.
+86-0551-65418671 +8618949823763
sales@tnjchem.com China 34563 58

9009-54-5()Verwandte Suche:


  • Polyurethanes, cellular
  • The following companies react isocyanates or prepolymers with polyols to produce polyurethane foams. The list is incomplete.
  • POLYURETHANEOLIGOMERS
  • POLYURETHANEVARNISH
  • POLYURETHANELACQUER
  • Polyurethane foam: (Urethane polymers)
  • GTR Foam Polyfoam
  • Polyurethane elastomer
  • Polyurethane resin 685,high grade,color
  • Polyurethane resin,water-soluble
  • Polyurethane rigid foam plastic mixed component for foaming
  • Andur
  • Curene
  • Etheron
  • Polyurethane foams
  • Etheron sponge
  • Isourethane
  • Nci-C56451
  • Pliogrip
  • Polyfoam plastic sponge
  • Polyfoam sponge
  • Polyol Isocyanate PU Chemical for Making Shoe Sole
  • Waterborne PU Resin
  • Polyurethane foams ISO 9001:2015 REACH
  • Polyurethane, beads
  • Polyisocyanurate resins
  • PU foam
  • polyurethane polymer
  • Polyurethane foam
  • PU Resin
  • DTF Powder
  • POLYURETHANE
  • 9009-54-5
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