Modified Aluminum Hydroxide
Overview
Modified aluminum hydroxide is a functionalized version of aluminum hydroxide, engineered to improve dispersion, compatibility, and flame-retardant efficiency in polymer matrices. The modification typically involves surface treatments (e.g., silane coupling agents) to enhance interfacial adhesion with organic materials. Widely recognized as an eco-friendly alternative to halogenated flame retardants, it decomposes endothermically at ~200°C, releasing water vapor to cool the substrate and dilute flammable gases. Its non-corrosive decomposition products make it ideal for electronics and construction materials.
Physical and Chemical Properties
The base Al(OH)3 structure remains intact, but surface modifications alter its hydrophobicity and reactivity. Common treatments include silanes for polymer compatibility or fatty acids for reduced agglomeration. The modified product retains high whiteness (≥95% reflectance) and low abrasiveness. Thermogravimetric analysis (TGA) shows a 30–35% weight loss upon decomposition, corresponding to water release. Modified versions often exhibit delayed decomposition onset (by 20–50°C) compared to untreated Al(OH)3, broadening processing temperature windows for thermoplastics like polyethylene or EVA.
Main Applications
Primary use is in flame-retardant composites: wire/cable insulation (60–65% loadings), automotive parts, and thermoplastic polyolefins account for ~70% of demand. In epoxy resins, it reduces smoke density by 50–80% while meeting UL94 V-0 ratings. Niche applications include additive for intumescent coatings and filler in silicone rubber (improves tracking resistance). Recent developments target low-density formulations for 3D-printed fire-safe components, leveraging its minimal impact on mechanical properties at optimized loadings.
Safety and Storage
Classified as non-hazardous under GHS, but dust exposure may cause mechanical irritation to eyes/respiratory tract. Storage requires moisture-proof packaging (PE-lined bags) and separation from acids to prevent premature decomposition. During compounding, recommend using closed mixing systems to control dust. Spills should be cleaned dry; water washing may spread fine particles. Disposal follows inert landfill guidelines, as decomposition products (alumina) are environmentally benign.
B2B Procurement Guide
Specify modification type: silane-treated grades suit most polymers, while stearate coatings optimize flow in extrusion. Critical parameters include median particle size (D50: 1–15µm, trade-off between dispersion and viscosity) and loss on ignition (LOI <0.5% indicates proper drying). Bulk shipments (25kg bags or 1-ton super sacks) commonly offer 10–15% cost savings versus small batches. Audit suppliers for consistent surface treatment coverage (FTIR verification) and ask for technical datasheets with DSC/TGA curves for your specific application testing.
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