Overview
Black granulated masterbatch is a pre-dispersed pigment concentrate used to impart uniform black coloration to plastics during manufacturing. It consists of high-load carbon black or other black pigments embedded in a polymer carrier, such as polyethylene or polypropylene. The granulated form ensures easy handling, accurate dosing, and minimizes dust generation compared to powder pigments. Masterbatches are widely adopted in industrial plastic production due to their cost-effectiveness and consistent performance. They eliminate the need for direct pigment handling, reducing contamination risks and improving workplace safety. The formulation can be customized for specific processing methods like extrusion, injection molding, or blow molding.
Physical and Chemical Properties
The physical properties of black granulated masterbatch depend on the carrier resin and pigment type. Typical density ranges between 1.1-1.3 g/cm³, with melting points aligning with the base polymer (e.g., 120-160°C for PE-based masterbatches). The granules exhibit excellent thermal stability, resisting degradation during high-temperature processing. Chemically, the masterbatch is inert under normal conditions but may release minimal volatile organic compounds (VOCs) at elevated temperatures. The carbon black content ensures strong UV resistance and opacity, making it suitable for outdoor applications. Solubility is limited to molten plastics, with no dissolution in water or common solvents.
Main Applications
Black granulated masterbatch is extensively used in plastic films for packaging, agricultural mulch, and garbage bags due to its opacity and UV protection. Injection-molded products like automotive parts, household appliances, and electronic casings benefit from its consistent coloration and flow properties. In blow molding, it is applied for bottles, containers, and industrial drums. Fibers and textiles, such as synthetic ropes and geotextiles, also utilize this masterbatch for durable coloring. Specialty applications include conductive plastics (using high-grade carbon black) and engineering plastics requiring precise color matching.
Safety and Storage
While black masterbatch is generally safe, precautions are necessary to avoid respiratory irritation from dust during handling. Use gloves and masks in poorly ventilated areas. The product is non-flammable but should be kept away from open flames to prevent carrier resin combustion. Storage requires a dry, cool environment (below 30°C) to prevent moisture absorption or clumping. Sealed containers are recommended to maintain product integrity. Shelf life typically exceeds 12 months if stored properly. In case of accidental ingestion or eye contact, rinse thoroughly with water and seek medical advice.
B2B Procurement Guide
When procuring black granulated masterbatch, prioritize suppliers with ISO-certified manufacturing facilities to ensure quality consistency. Key specifications to evaluate include pigment concentration (usually 20-50%), carrier resin compatibility, and dispersion quality (tested via microscopic analysis or film extrusion). Request samples for trial runs to assess color consistency, processing behavior, and final product performance. Bulk pricing negotiations are common for orders exceeding 1 ton. Logistics considerations include moisture-proof packaging and palletized delivery for large quantities. Establish long-term contracts with reliable suppliers to secure stable pricing and timely deliveries.
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