Solutions for Masterbatches - Sachtleben Chemie GmbH

Inorganic metal deactivatorsAll polymers intended for long-term service, and those exposedto elevated temperatures, in particular, are modified by the additionof organic metal deactivators. As is well known, metalions of various oxidation levels (e.g. manganese, copper, iron,etc.) are capable of acting as catalysts and causing oxidationof the polymer via a cyclical catalytic process. The origins ofthese metals are diverse, and can be traced back to abrasionof metal equipment components and impurities contained innatural fillers such as calcium carbonate, talc and barytes. In thecase of electrical cables and wires, contact is inevitable, sinceit is necessary to insulate the conductive core. Phosphites andhindered phenols have proven to be effective organic metaldeactivators, while inorganic deactivators remained more orless unknown.Migrating metals reducethe thermal stability ofcable insulationMetal deactivators(MDs) neutralize metalsand enhance service-lifeSACHTOTEC MD 300SACHTOTEC MD 300 is a preparation consisting of ultra-finezinc sulfide and an organic dispersion agent. As a co-stabilizer,itcombines excellent metal-deactivation propertieswith outstandingmigration stability and ease of use. Thanks to its fine crystallite andparticle sizes, SACHTOTEC MD 300 can be used in a large rangeof systems without affecting color. Since SACHTOTEC MD 300is an inorganic product, it is immune to fogging.Applications• Electrical cables and wire; tube and pipe products• Domestic appliances• Vehicle interiors• Air-conditioning and heating systemsSACHTOTEC MD 300 is highly suitable for use as a thermalco-stabilizer in combination with organic metal deactivatorsesp. based on phenolics. SACHTOTEC MD 300 offers significantbenefits in terms of:Stabilization• Long polymer service-life• High-temperature stability• Low loadingOptical properties• Transparent• Can be used in colored, gray and black systemswith no lightening effectPermits reduction of organic metal deactivator input• Cost-efficiency• Reduction of secondary effects,such as migration and fogging16SACHTOTEC MD 300 is extremely suitable for use in polyolefinsand other thermoplastics. In combination with phenolicorganic metal deactivators, it permits achievement of significantincreases in thermal stability. Best performance is observed whenSACHTOTEC MD 300 is used in combination with hinderedphenol compounds. A SACHTOTEC MD 300 content, with0.2 to 0.3% organic metal deactivator, is recommended as anoptimized formulation.