26447-40-5 Usage
Description
4,4'-METHYLENEBIS(PHENYL ISOCYANATE), also known as MDI, is a white, odorless diisocyanate that may also occur in crystalline form. It exists in three isomers, (2,20-MDI, 2,40-MDI, and 4,40-MDI), however, the primary technical/commercial form of MDI is actually polymeric MDI, which is a mixture that contains 25–80% monomeric 4,40-MDI as well as oligomers containing three to six rings and other minor isomers, such as the 2,20-isomer and the 4,40 isomer. MDI is most widely used and accounted for 62% of the global market in 2000.
Uses
Used in Construction Industry:
4,4'-METHYLENEBIS(PHENYL ISOCYANATE) is used as a protective coating for various surfaces such as cement, wood, fiberglass, steel, and aluminum. It is used to protect surfaces from wear and tear, and to provide insulation and waterproofing properties. It is commonly used in applications such as truck beds, trailers, boats, foundations, and decks.
Used in Adhesive Industry:
4,4'-METHYLENEBIS(PHENYL ISOCYANATE) is used as a high-strength adhesive in both industrial and consumer applications. It is used to bond various materials together, providing strong and durable bonds that can withstand various environmental conditions.
Used in Retail and Commercial Industry:
4,4'-METHYLENEBIS(PHENYL ISOCYANATE) is used to produce polyurethane foams for a wide range of retail, commercial, and industrial uses. These foams are used in various applications such as insulation, cushioning, and padding in furniture, bedding, and other consumer products.
Storage
Cool, ventilated, strictly waterproof, moisture-proof, avoid direct sunlight, and keep away from fire and heat sources. The storage temperature should not exceed 20℃ during long-term storage.
Environmental Fate
MDI is the least hazardous of the commonly available isocyanates,
however, it is not without toxicity. It has low vapor
pressure, which reduces hazards during handling compared to
the other major isocyanates, e.g., TDI, HDI. The complex nature
of MDI composition and reactions in the environment often
makes interpretation difficult. Release of MDI to the atmosphere
is low due to its low volatility and since MDI readily degrades to
inorganic compounds in the presence of hydroxyl radicals, its
atmospheric half-life is short. High exposures involving MDI in
ambient environments are expected to be rare. There is no
information about levels of various forms of MDI in the
ambient air. When MDI is released to water, it reacts readily with
water to form mixtures of diisocyanates and amines, which then
readily react with more MDI to produce inert, solid, insoluble
polyurea. MDI has a transient existence due to its reaction with
the water to produce predominantly insoluble polyureas. The
evidence indicates that MDI accumulation through the aquatic
food chain is extremely unlikely, as might be expected considering
the very low solubility and high reactivity of MDI with
hydroxyl radicals in aqueous solution.
Toxicity evaluation
A definitive mechanism of MDI toxicity is unknown; however,
it is speculated that humoral and cellular immunity may be
involved in the pathogenesis of hypersensitivity due to isocyanate
sensitization responses of both animals and humans.
Check Digit Verification of cas no
The CAS Registry Mumber 26447-40-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,6,4,4 and 7 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 26447-40:
(7*2)+(6*6)+(5*4)+(4*4)+(3*7)+(2*4)+(1*0)=115
115 % 10 = 5
So 26447-40-5 is a valid CAS Registry Number.
