Organometallic urethane catalysts include dibutyltin dilaurate
, potassium octoate, zinc octoate, lead neodecanoate, bismuth octoate, bismuth neodecanoate, tin neodecanoate, and lithium neodecanoate.
2 M of diethyl carbonate, 1/1000 M of dibutyltin dilaurate
(DBTDL) was supplied by Sinopharm Chemical Reagent, Shanghai, China.
w] = 2000), and dibutyltin dilaurate
(DBTDL) catalyst were purchased from Aldrich.
(DBTDL) was received from Merck-Schuchardt, [d.
Also standard dibutyltin dilaurate
(Cata-Chek 820) and dibutyltin diacetate (Cata-Chek 867).
eta]] of all PVC films decreases quickly, except the sample containing dibutyltin dilaurate
, of which [M.
Cotins line of standard and proprietary organotins, including dibutyltin dilaurate
and stannous octoate, are for urethane elastomers, and rigid and semi-rigid foam.
DABCO 120[R] from Air Products (Allentown, PA) was used as the catalyst for chain extension reactions.
Stanclere TL dibutyltin dilaurate
is said to provide better hydrolytic stability in premixes containing polyol, water and silicone than stannous catalysts, giving the premix a longer storage life.
The first reaction was carried out in the presence of dibutyltin dilaurate
under a dry nitrogen atmosphere at 50-55[degrees]C for 4 h.
After this step, dibutyltin dilaurate
(Sn, 1 wt%) was added as a catalyst for the hydrolysis/condensation reactions.