Hexamethylene Diisocyanate CAS 822-06-0
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- Appearance: Colorless liquid
- Purity: 99. 0%min
- Stock: In stock
- Sample: Available
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Hexamethylene Diisocyanate: The Complete Guide
Hexamethylene Diisocyanate for Sale
|Chemical Name:||Hexamethylene Diisocyanate|
|Other Name:||1,6-Diisocyanato-hexan; 1,6-Hexamethylene diisocyanate|
|Type:||Pharmaceutical intermediates; Organic raw materials|
What is Hexamethylene Diisocyanate?
Hexamethylene diisocyanate (HDI) is a natural substance with the molecular formula (CH 2) 6 (NCO) 2. It is categorized as diisocyanate. It is an anemic liquid. It is sometimes described as HMDI however is generally not done to avoid complication with hydrogenated MDI.
Compared to various other business diisocyanates, HDI’s manufacturing is relatively little, making up only 3.4% of the global diisocyanate market in 2000 (together with isophorone diisocyanates). It is generated by phosgenation of hexamethylene diamine.
Hexamethylene Diisocyanate Uses
- HDI series is the most crucial monomer in aliphatic diisocyanates (ADI), accountancy for about 60% of the overall need for ADI. Many HDI is prepared as HDI biuret or HDI trimer. HDI as well as HDI biuret and trimer are important basic materials for creating polyurethane coverings and also polyurethane elastomers.
- Polyurethane layers generated from HDI, HDI biuret or trimer have the features of non yellowing and also solid climate resistance, and also are commonly utilized in air travel, autos, design, timber, plastics, leather, as well as other areas. This item is also utilized as a crosslinking agent for dry alkyd resins and also as a basic material for synthetic fibers.
- Lactic acid polymers were manufactured from oligomers using very reactive 1,6-hexamethylene diisocyanate (HMDI) by adding 2,2 ‘- bis (2-oxazoline) (BOX) as a chain extender. By manufacturing polyols based on alkoxylamines as well as reacting them with trifunctional homopolymers of HMDI and polyethylene glycol (PEG), polyurethane elastomers are endowed with self-healing capability. Plastic optical fiber (POF) is prepared with the mass homopolymerization reaction of HMDI under the catalysis of tin (II) -2-ethylhexanoic acid (SnOct).
- Hexamethylene diisocyanate (HDI) is one of the most usual aliphatic isocyanates. It is a monomer made use of to generate polyurethane foam as well as high-grade layers, and is additionally utilized in some commercial layers and paint procedures. It is a compound that easily responds with water and also alcohol (Von 1993). It has a vapor pressure of 0.05 millimeters of mercury at room temperature, but can exist in the form of aerosols, which may create a lot more individual exposure. HDI-BT trimer is commonly utilized for comparable commercial applications. Anticipated reduced vapor stress; However, aerosol kinds may also exist, which may reveal individuals to extra HDI-BT. Hexamethylene diisocyanate responds slowly with water to form carbon dioxide (HSDB 1996). The alkali catalyzed reaction between hexamethylene diisocyanate and alcohols ought to be performed in an inert solvent; In the lack of solvents, this response may lead to explosive physical violence (NFPA 1994).
Hexamethylene diisocyanate is an aliphatic diisocyanate monomer commonly made use of in the production of oligomers and also prepolymers. When incorporated with polyols, it produces a photostable polyurethane.
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Application of Hexamethylene Diisocyanate
Aliphatic diisocyanates are made use of for special applications, such as enamel finishings that are immune to wear as well as UV deterioration. These qualities are especially required in outside finishes such as those applied to aircraft and also ships. HDI is also offered as a trimer or biuret in an oligomeric kind for auto fixing finishings. Although these kinds are much more viscous, they reduce volatility as well as poisoning. At least three companies are selling materials readily in this type. It is likewise used as an activator in the process of in-situ polymerization of caprolactam, that is, tape casting nylon process. HDI is likewise made use of for the synthesis of bisoxazolidines, as the hydroxyl groups on the particle permit additional reaction with hexamethylene diisocyanate.
Production Method of Hexamethylene Diisocyanate
- Hexamethylenediamine responds with co2 or hydrochloric acid to create hexamethylenediamine carbonate or hydrochloride, after that undertakes photochemical reaction, after that gets rid of the remedy by purification, and acquires HDI with rectification. HDI responds with water and also a catalyst to manufacture HDI biuret, after that vaporizes with a thin-film evaporator to remove recurring HDI, as well as adds cellosolve to prepare a remedy with a solid content of 75% to get HDI biuret as a resources for state-of-the-art paint. Each lots of product eats about 1280kg of diamine (95%) and 4700kg of phosgene.
- The byproduct of adipic acid, adipic hydrochloride, responds with phosgene in the solvent chlorobenzene to generate hexamethylene-1,6-diisocyanate, and afterwards the ended up item is acquired with purification to get rid of the solvent and also fractional purification under reduced pressure.
- PubChem. “Hexamethylene diisocyanate”. pubchem.ncbi.nlm.nih.gov.
- Howarth, GA (July 2003). “Polyurethanes, polyurethane dispersions and polyureas: Past, present and future”. Surface Coatings International Part B: Coatings Transactions.
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