Isocyanate - Wikipedia
An organic compound with two isocyanate groups is known as a diisocyanate. Diisocyanates are manufactured for the production of polyurethanes, a class of polymers. [1] [2] [page needed] [3] [page needed] Isocyanates should not be confused with cyanate esters and isocyanides, very different families of compounds.
Diisocyanates Explained - American Chemistry Council
Diisocyanates Explained. Since the late 1940s, diisocyanates — a family of versatile chemical building blocks — have been utilized to make polyurethane products, such as rigid and flexible foams, coatings, adhesives, sealants and elastomers (CASE).
A brief overview of properties and reactions of diisocyanates
2022年5月8日 · Diisocyanates are monomers used to make polyurethane (PU) polymers and are characterized by having two NCO groups as their key reactive sites. They are distinguished from mono-isocyanates, like methyl isocyanate, which is used industrially as an acylating agent, by having very different physical properties and toxicological profiles.
Diisocyanate - an overview | ScienceDirect Topics
Abstract. Diisocyanates are the most common cause of occupational asthma in many industrialized nations, and various pathogenic mechanisms have been suggested to be involved. Methylenediphenyl diisocyanate (MDI) exposure is monitored by analyzing biomarkers in hydrolyzed urine and plasma.
Polyurethanes & Diisocyanates - Chemical Safety Facts
2023年7月26日 · Diisocyanates. Diisocyanates are a family of chemical building blocks used to make a wide range of polyurethane products. The most widely used aromatic diisocyanates are toluene diisocyanate (TDI) and methylene diphenyl diisocyanate (MDI).
Toluene diisocyanate - Wikipedia
Toluene diisocyanate (TDI) is an organic compound with the formula CH 3 C 6 H 3 (NCO) 2. Two of the six possible isomers are commercially important: 2,4-TDI (CAS: 584-84-9) and 2,6-TDI (CAS: 91-08-7). 2,4-TDI is produced in the pure state, but TDI is often marketed as 80/20 and 65/35 mixtures of the 2,4 and 2,6 isomers respectively.
Diisocyanate - an overview | ScienceDirect Topics
Methylene diphenyl diisocyanate (MDI) and Toluene diisocyanate (TDI) are the most common examples of isocyanates and are the most active, unstable and less expansive isocyanates, suitable for the synthesis of flexible foams [38].
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