REAXIS® C228 (Dioctyltin Diacetate) is an octyl-based organotin with a carboxylate functionality. REAXIS® C228 is a highly reactive neat liquid octyl tin, given its high tin content (28%) and related small ligand. REAXIS® C228 contains the highest concentration of tin for liquid-based octyl tin products. Similar products include REAXIS® C216 (Dioctyltin Dilaurate), REAXIS® C314 (Dioctyltin bis-(2-ethylhexyl maleate),and REAXIS® C318 (Dioctyltin Dineodecanoate). The butyl-based organotin analog of REAXIS® C228 is REAXIS® C233 (Dibutyltin Diacetate).
|Tin Content (%)||25.0 - 27.0|
|Density (g/ml)||1.10 -1.20|
|Viscosity (cP @ 25°C)||20 - 50|
|Color (Gardner Number)||4 Max|
REAXIS® C228 and its alternatives can be used as a homogenous catalyst in a wide spectrum of polyurethane and silicone applications including adhesives and sealants, elastomers and plastics, and coatings. Silicone-based applications include: acetoxy-, ethoxy- and oxime-based Room Temperature Vulcanizing (RTV) adhesives and sealants, polyethylene crosslinked silanes (PEX), and select silane modified polymers (SMPs). In regard to polyurethane applications, REAXIS® C228 can be used for most related applications including coatings, adhesives and sealants, elastomers, and foams. As an octyl tin, REAXIS® C228 is an ideal candidate as an alternative for the more regulated butyl tins and REAXIS® C216, being that the latter is identified as a Substance of Very High Concern (SVHC) in the EU.
The reactivity and raw material compatibility of REAXIS® C228 should be somewhat similar to its butyl tin analogue, REAXIS® C233. Due to the larger alkyl group and steric effects and lower active tin metal content (28% vs 33%), REAXIS® C228 is expected to be somewhat slower in reactivity compared to REAXIS® C233, although this would be highly formulation specific. This reactivity difference is evidenced both in polyurethane and silicone chemistries in general, across all specialty chemical applications. In regard to silicone reactions, REAXIS® C228, like all tin-based catalysts, will catalyze the silanol/silane condensation reaction thus acting as both a polymerization and crosslinking catalyst. As a polyurethane catalyst, REAXIS® C228, will preferentially catalyze the urethane reaction and to a lesser extent the water reaction.
REAXIS® C228 should be stored in the original packaging at moderate temperatures and kept from freezing. The container should be closed tightly after each use to maximize shelf life. Characteristic of most Sn (IV) organotins, the primary cause of instability would be hydrolysis. Hydrolysis results in the formation of tin oxide insolubles leading to deactivation of REAXIS® C228.