Overview
Modified black masterbatch is a pre-dispersed pigment concentrate containing 20-50% carbon black in a polymer carrier. Unlike standard black masterbatches, modified versions incorporate additives like dispersants, stabilizers, or processing aids to enhance performance in specific applications. These formulations are engineered to address common challenges in plastic coloring, such as poor dispersion or thermal degradation. The modification process tailors the product for compatibility with particular resins like PP, PE, or ABS, making it a versatile solution for industrial plastic processing.
Physical and Chemical Properties
The material exhibits excellent lightfastness (typically 7-8 on the blue wool scale) and heat resistance up to 300°C in short exposures. Its electrical conductivity varies with carbon black loading - standard grades show volume resistivity >10^10 Ω·cm, while conductive grades may achieve <10^3 Ω·cm. Dispersion quality is critical, measured by filter pressure value (FPV) tests. Premium grades maintain FPV below 2.0 MPa·cm²/g at 25% loading. Carrier resins (often LDPE or EVA) determine melt flow characteristics, with MFI typically ranging 2-20 g/10min (190°C/2.16kg).
Main Applications
In packaging films (20-50μm), it provides uniform coloration at 1-3% loading while maintaining seal strength. Automotive exterior parts utilize UV-stabilized grades at 2-5% concentration for weatherability. Pipe extrusion applications benefit from its ability to meet ISO 18553 dispersion standards at 1.5-4% dosage. Specialty grades serve niche markets: antistatic versions for electronics packaging (surface resistivity 10^6-10^9 Ω/sq), while fiber grades optimize for spin-dyeing processes. The construction sector uses high-loading (40-50%) variants for cost-efficient concrete coloring.
Safety and Storage
While generally classified as non-hazardous, dust generation during handling requires NIOSH-approved N95 respirators. Spills create slipping hazards and should be cleaned promptly with industrial vacuums rather than brooms to prevent dust clouds. Storage life is typically 12-24 months in original packaging. Bulk storage silos should include desiccant breathers to maintain moisture content below 0.1%. Thermal degradation begins at approximately 80°C above the carrier resin's melting point, necessitating strict temperature control during shipping.
B2B Procurement Guide
Specify technical requirements including: carbon black content (ASTM D1603), carrier resin type, melt flow index (ISO 1133), and dispersion class (ISO 18553 Class A-C). Request samples for lab-scale testing of color strength (DIN 53775) and processing stability. For large orders (20+ tons), negotiate MOQ discounts but verify batch-to-batch consistency through COA review. Container-load shipments often offer 8-12% cost savings over LTL. Consider regional suppliers for just-in-time delivery to minimize inventory costs.
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