REAXIS® C226 (Dibutyl Tin bis-(Acetylacetonate)), commonly referred to as Dibutyl Ketone, is a butyl-based organotin with a ketonate functionality. REAXIS® C226 is a highly reactive neat liquid butyl tin given its high tin content (26%) and related small ligand. REAXIS® C226 is part of the tin (IV) family of organotins. Due to its ketonate-based ligand, Dibutyl Ketone has an improved hydrolytic stability compared to carboxylate functionalized organotins such as REAXIS® C218 (Dibutyl Tin Dilaurate). Products with similar reactivities include include REAXIS® C248D (Dibutyl Tin Oxide), REAXIS® C248DP (Dibutyl Tin Oxide), and REAXIS® C248DN (Dibutyl Tin Oxide). The octyl-based organotin analog of REAXIS® C226 is REAXIS® C2013 (Dioctyl Tin Diacetate). REAXIS® C2013 is only sold for commercial use in the EU. If you’re unsure of which specialty chemical products you need for your particular application, feel free to contact us and request samples on respective product pages.
|Tin Content (%)||26.5 - 28.5|
|Color (Gardner Number)||5 Max|
|Viscosity (cP @ 20°C)||20 - 45|
|Density (g/ml)||1.20 - 1.26|
REAXIS® C226 and its alternatives can be used as a homogenous catalyst in a wide spectrum of silicone applications including adhesives, sealants, 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). REAXIS® C226 is the primary catalyst used with MS Polymer® based formulations. REAXIS® C226 is on a broad range of international regulatory lists and is thus an ideal candidate for global formulation development. REAXIS® C226 is on the ECHA’s Substance of Very High Concern (SVHC) and thus the octyl version, REAXIS® C2013, may be a better option for use in the EU.
Given its high tin content, liquid form, small ligand, and good compatibility with a wide range of raw materials, REAXIS® C226 tends to be a highly reactive catalyst across a broad range of silicone formulations. In regard to silicone reactions, REAXIS® C226, like all tin-based catalysts, will catalyze the silanol/silane condensation reaction thus acting as both a polymerization and crosslinking catalyst. In addition to reactivity, REAXIS® C226 is more hydrolytically stable toward condensation-generated moisture. Reactivity-wise, REAXIS® C248D, REAXIS® C248DP, and REAXIS® C248DN would be similar.
REAXIS® C226 should be stored in the original packaging. This product has a tendency to crystallize, thus it is recommended that it be stored at temperatures above room temperature. If crystallization does occur, it is recommended that vented containers are warmed at 30-40C. 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® C226.