Silicone additive

Dow Corning Corp. (Midland, MI, US), a wholly owned subsidiary of The Dow Chemical Company (Midland, MI, US), recently launched at Chinaplas 2017 Dow Corning 43-821 Additive, an advanced new silicone technology designed to resolve mechanical performance degradation and corrosivity issues caused by high loadings of traditional flame-retardant (FR) additives, such as organic phosphorous, in polyamide (PA) compounds.

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Dow Corning Corp. (Midland, MI, US), a wholly owned subsidiary of The Dow Chemical Company (Midland, MI, US), recently launched at Chinaplas 2017 Dow Corning 43-821 Additive, an advanced new silicone technology designed to resolve mechanical performance degradation and corrosivity issues caused by high loadings of traditional flame-retardant (FR) additives, such as organic phosphorous, in polyamide (PA) compounds. Glass-reinforced PA6 and PA66 compounds are widely used in electrical/electronic applications in the automotive and appliance industries. When selecting an FR additive, many compounders and their customers prefer halogen-free solutions for sustainability. Organic phosphorous additives such as aluminum phosphinate, often blended with melamine polyphosphate, are a popular choice, but they have a major drawback:  the high loadings (up to 20%) that are required to meet regulatory requirements. High phosphorous content in PA compounds can result in the degradation of mechanical properties, such as impact, elongation and maximum force at traction, and present high corrosivity. Dow Corning 43-821 Additive used at low levels (1% to 2%) reduces the total amount of organic phosphorous additive needed in PA6 and PA66 compounds by 40 percent, while still providing high levels of FR performance. And, it reportedly restores key mechanical properties of PA resin, minimizes corrosion of metallic parts that contact the formulation and lowers compound costs by 10 percent or more. Compounders and manufacturers can continue to benefit from halogen-free organic phosphorous FR additives without the downsides. The new product’s synergistic effects on PA resin yield excellent FR properties including char formation, anti-dripping and reduced heat generation. Tests indicate that 30 percent glass-filled PA compounds incorporating 13 wt% of aluminum phosphinate and 2 wt% of Dow Corning 43-821 Additive met the requirements for UL-94 V-0 at 1mm. Further, Dow Corning 43-821 Additives, which are supplied in powder form for easy blending with leading aluminum phosphinate additives, are stable at the high processing temperatures needed for glass-reinforced PA.