Chemistry:Hydrogenated MDI

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Hydrogenated MDI
Hydrogenated MDI.svg
Names
IUPAC name
1-isocyanato-4-[(4-isocyanatocyclohexyl)methyl]cyclohexane
Other names
H12MDI
4,4′-diisocyanato dicyclohexylmethane
dicyclohexylmethane-4,4'-diisocyanate
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
EC Number
  • 225-863-2
RTECS number
  • NQ9250000
UNII
UN number 2206
Properties
C15H22N2O2
Molar mass 262.353 g·mol−1
Hazards
GHS pictograms GHS06: ToxicGHS07: HarmfulGHS08: Health hazard
GHS Signal word Danger
H315, H317, H319, H331, H334, H335
P261, P264, P271, P272, P280, P285, P302+352, P304+340, P304+341, P305+351+338, P311, P312, P321, P332+313, P333+313, P337+313, P342+311, P362, P363, P403+233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Hydrogenated MDI (H12MDI or 4,4′-diisocyanato dicyclohexylmethane) is an organic compound in the class known as isocyanates.[1] More specifically, it is an aliphatic diisocyanate. It is a water white liquid at room temperature and is manufactured in relatively small quantities. It is also known as 4,4'-methylenedi(cyclohexyl isocyanate) or methylene bis(4-cyclohexylisocyanate)[2] and has the formula CH2[(C6H10)NCO]2.

Manufacture

The product is manufactured by hydrogenation of methylene diphenyl diisocyanate. It may also be manufactured by phosgenation of 4,4-Diaminodicyclohexylmethane.

Uses

Aliphatic diisocyanates are not used in the production of polyurethane foam as the cost is too high and foam is very much a commodity. It is used in special applications for polyurethane, such as enamel coatings which are resistant to abrasion and degradation from ultraviolet light. There are also multiple patents where prepolymers based on it are used in golf ball production.[3] It is available commercially under the tradename of Desmodur W from Covestro - formerly Bayer Material Science. It is used as a reactive building block for the preparation of other chemical products such as isocyanate terminated prepolymers and other urethane polymers.[4] The isocyanate groups can undergo addition reactions at room temperature with compounds which contain active hydrogens especially amines and polyols. Polyurethane resins based on this diisocyanate have good flexibility and mechanical strength. The polymers formed tend to have abrasion and hydrolysis resistance as well as retaining gloss and physical properties upon weathering. The resins based on this material are useful in coatings for flooring, roofing, maintenance and adhesives, and sealants. They find use in the coatings, adhesives, sealants and elastomers (CASE) applications.[5][6] A prepolymer made from H12MDI and incorporating dimethylol propionic acid can also be converted to light stable polyurethane dispersions.[7][8]

See also

References

  1. PubChem. "Bis(4-isocyanatocyclohexyl)methane" (in en). https://pubchem.ncbi.nlm.nih.gov/compound/21202. 
  2. "CDC - NIOSH Pocket Guide to Chemical Hazards - Methylene bis(4-cyclohexylisocyanate)". https://www.cdc.gov/niosh/npg/npgd0412.html. 
  3. Iwami, Satoshi, "Wound-core golf ball", US patent 6593443, published 2003-07-15, issued 2001-09-05
  4. Howarth, GA (2003-06-01). "Polyurethanes, polyurethane dispersions and polyureas: Past, present and future" (in en). Surface Coatings International Part B: Coatings Transactions 86 (2): 111–118. doi:10.1007/BF02699621. ISSN 1476-4865. https://doi.org/10.1007/BF02699621. 
  5. Fukuda, Keisuke; Seiji Nagahisa & Hiroshi Yamaguchi, "Two-part curing high-durable polyurethane elastomer composition", US patent 7598336, published 2009-10-06, issued 2004-12-10
  6. Pela, Roberto; Hans-Georg Kinzelmann & Yongxia Wang et al., "Ultralow monomer polyurethanes", EP patent 3067377, published 2016-09-14, assigned to Henkel AG & C. KGaAand Henkel IP & Holding GMBH
  7. Howarth, G. A.; Manock, H. L. (1997-07-01). "Water-borne polyurethane dispersions and their use in functional coatings" (in en). Surface Coatings International 80 (7): 324–328. doi:10.1007/BF02692680. ISSN 1356-0751. https://doi.org/10.1007/BF02692680. 
  8. Chen, S. (2021). "Synthetic scheme to increase the abrasion resistance of waterborne polyurethane–urea by controlling micro-phase separation" (in en). J Appl Polym Sci 138 (24): e50561. doi:10.1002/app.50561. ISSN 1097-4628. https://doi.org/10.1002/app.50561.