Overview
Moisture-proof functional masterbatch is a concentrated additive designed to impart hydrophobic properties to plastic products during manufacturing. Comprising moisture-blocking compounds (e.g., silica gel, fatty acid salts) dispersed in a polymer carrier, it enables cost-effective enhancement of plastic's barrier performance. Unlike surface coatings, this masterbatch provides bulk moisture protection throughout the material matrix. It is particularly valuable in humid climates or for products requiring long-term storage stability. The additive ratio typically ranges from 1-5% depending on the base polymer and required protection level.
Physical and Chemical Properties
The masterbatch exhibits stable thermal properties within standard plastic processing temperatures (160-220°C for most applications). Its moisture resistance derives from hydrophobic additives that reduce water vapor transmission rates (WVTR) by 30-70% compared to untreated plastics. Key performance indicators include water absorption rate (commonly <0.5% after 24h immersion) and humidity resistance duration. The product maintains effectiveness across pH ranges of 5-9, making it suitable for diverse environments. Particle size distribution (usually 2-4mm) ensures uniform dispersion during compounding.
Main Applications
Primary use occurs in food packaging (e.g., rice bags, dried food containers) where WVTR below 5g/m²/day is critical. Electronics manufacturers employ it for protective films and component housings to prevent circuit corrosion. Agricultural applications include greenhouse films with reduced internal condensation. The construction sector utilizes it in damp-proof membranes and plumbing fittings. Recent developments target biodegradable plastics, with starch-based formulations achieving 40% humidity resistance improvement.
Safety and Storage
Classified as non-hazardous under GHS standards, though dust generation during handling requires standard particulate controls. Storage life is 12-18 months in original moisture-proof packaging at <30°C/65% RH. Processing facilities should ensure adequate ventilation when masterbatch exceeds 3% additive loading. Spills pose minimal risk but should be cleaned promptly to prevent slip hazards. Compatibility testing is recommended when switching polymer bases (e.g., from PP to PET) to avoid processing issues.
B2B Procurement Guide
Industrial buyers should specify: 1) Target WVTR reduction percentage 2) Base polymer compatibility 3) Processing temperature range 4) Regulatory compliance needs (FDA, RoHS etc.). Sample testing should verify performance under actual production conditions. Bulk purchases (20+ tons) typically secure 8-12% discounts. Leading manufacturers include Clariant, PolyOne, and local specialists like Guangzhou Lingyin. Just-in-time delivery is advisable to preserve shelf life.
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