Spectroscopic study of the reaction of glycol ethers with di-isocyanates, catalysed by organo-tin compounds

Lipatova, T.E.; Bakalo, L.A.; Loktionova, R. A.

doi:10.1016/0032-3950(68)90373-0

Cited by 5 publications

(2 citation statements)

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“…Comparison of catalyzed and noncatalyzed polyurethane systems show that the reaction orders as well as the rate constants vary. Based on these experiments and the previous studies, [17][18][19][20][21][22][23] it is apearent that the reaction mechanisms are affected by the presence of DBTDL. Efforts have been made to explain the catalysis mechanism in various reaction systems.…”

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confidence: 93%

“…Catalysis utilizing organotin compounds for polyurethane/polyurea formation reactions has been of interest, and various intermediates were proposed in an attempt to elucidate the reaction mechanisms 17, 18. For example, existence of tin–alcohol complexes19–22 as well as complexation of tin compounds with isocyanates22, 23 were detected. Thus, it was proposed24–28 that ternary complexes involving tin compounds were formed.…”

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confidence: 99%

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Kinetics and mechanisms of catalyzed and noncatalyzed reactions of OH and NCO in acrylic polyol–1,6‐hexamethylene diisocyanate (HDI) polyurethanes. VI

Han

Urban

2002

J of Applied Polymer Sci

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Fourier transform infrared spectroscopy was used to study the kinetics of noncatalyzed and catalyzed polyurethanes. These studies show that for noncatalyzed acrylic polyol-hexamethylene diisocyanate (HDI) trimer reactions, the reactions between OH and NCO of HDI exhibit second-order kinetics, with first-order kinetics with respect to NCO and OH. On the other hand, when dibutyltin dilaurate (DBTDL) is used as a catalyst in acrylic polyol-HDI trimer reactions, the reaction rate is first order with respect to NCO and 0.5 order in OH and DBTDL concentrations. A mechanism for the catalyzed acrylic polyol-HDI trimer crosslinking reactions is proposed and it appears that an equilibrium involving associations between OH and DBTDL exists, resulting in the formation of an active anion, which interacts with NCO to generate polyurethanes. To further verify this mechanism, the influence of acidity on the reaction rate constant was investigated. When the acidity of the system is increased, retardation of urethane formation occurs.

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confidence: 93%