Polyurethane
- CAS No.
- 9009-54-5
- Chemical Name:
- Polyurethane
- Synonyms
- PU foam;Polyurethane foam;PU Resin;polyurethane polymer;Polyisocyanurate resins;Andur;Curene;Etheron;Pliogrip;Nci-C56451
- CBNumber:
- CB1875782
- Molecular Formula:
- C3H8N2O
- Molecular Weight:
- 0
- MOL File:
- Mol file
- MSDS File:
- SDS
- Modify Date:
- 2024/7/26 17:09:36
| Stability | 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 DataBase Reference | 9009-54-5 |
| IARC | 3 (Vol. 19, Sup 7) 1987 |
Polyurethane Chemical Properties,Uses,Production
Chemical Properties
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.
History
Polyurethanes are an immensely versatile class of polymers used in insulators, foams, elastomers, synthetic skins, coatings, adhesives, and so forth. Polyurethane was first developed through essential diisocyanate polyaddition reactions by Dr. Otto Bayer and partners. In 1937, it reached industrial-scale synthesis and was established in the market in the 1950s[1].
Uses
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.
Preparation
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.
Production Methods
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.
Safety Profile
Questionable carcinogen with experimental tumorigenic data. When heated to decomposition it emits acrid toxic fumes of CNand NOx.
References
[1] Sonnenschein, M. “INTRODUCTION TO POLYURETHANE CHEMISTRY.” 2014. 0.
Polyurethane Preparation Products And Raw materials
Raw materials
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chevron_rightPreparation Products
| Supplier | Tel | Country | ProdList | Advantage | Inquiry |
|---|---|---|---|---|---|
| Arihant Innochem Pvt Ltd | +91-2267674895 +91-2267674895 | Mumbai, India | 37 | 58 | Inquiry |
| Otto Chemie Pvt. Ltd. | +91 9820041841 | Mumbai, India | 5873 | 58 | Inquiry |
| Aritech Chemazone Private Limited | +91-9034345475 | Punjab, India | 684 | 58 | Inquiry |
| Chemie Range | 08046047554 | Delhi, India | 56 | 58 | Inquiry |
| Leading Chemical and Trading Co.,Ltd | +8615669938129 | China | 130 | 58 | Inquiry |
| Hebei Mojin Biotechnology Co., Ltd | +8613288715578 | China | 12452 | 58 | Inquiry |
| Hebei Yanxi Chemical Co., Ltd. | +86-17531190177; +8617531190177 | China | 5873 | 58 | Inquiry |
| Henan Tianfu Chemical Co.,Ltd. | +86-0371-55170693 +86-19937530512 | China | 21669 | 55 | Inquiry |
| Chongqing Chemdad Co., Ltd | +86-023-6139-8061 +86-86-13650506873 | China | 39916 | 58 | Inquiry |
| SIMAGCHEM CORP | +86-13806087780 | China | 17367 | 58 | Inquiry |
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