I. Basic Product Introduction
1. Definition
PE filler masterbatch is a white granular modified raw material specifically designed for PE-based processing. It uses polyethylene (HDPE/LDPE/LLDPE) as the carrier resin and activated heavy calcium carbonate as the primary filler, compounded with coupling agents, dispersing lubricants, and antioxidant stabilizers. It is manufactured through high-temperature twin-screw kneading, extrusion, and pelletizing. It serves as a mainstream cost-reducing and modifying additive in the film, pipe, blow molding, and extrusion industries.
2. Core Composition
- PE Carrier Resin (12%–22%): Compatible with HDPE, LDPE, and LLDPE. It offers excellent compatibility with PE raw materials, ensuring no delamination or bleeding during mixing, while maintaining good processing fluidity.
- Inorganic Filler Powder (72%–85%, Main Component): Primarily surface-activated heavy calcium carbonate. High-end grades may use talc powder or barium sulfate. The powder undergoes activation treatment to prevent agglomeration, gel particles, and screen blockage.
- Functional Additives (2%–6%): Coupling agents enhance the bonding between the powder and the resin; internal and external lubricants improve extrusion fluidity; antioxidants prevent yellowing and aging during high-temperature processing.
3. Core Advantages
- Significant Cost Reduction: Low-cost inorganic powder partially replaces virgin PE resin, substantially reducing raw material costs for films, pipes, and injection-molded products.
- Optimized Physical Properties: Enhances the hardness, stiffness, wear resistance, and heat resistance of the final product. Reduces molding shrinkage, minimizing product deformation and sink marks. Improves the smooth feel of films and reduces blocking.
- Strong Processing Adaptability: Ensures uniform dispersion. Prevents white spots and gel particles in blown films, reduces wire breakage in drawing processes, and prevents die/screen blockage during extrusion without requiring major adjustments to existing equipment.
- Dimensional Stability & Enhanced Weather Resistance: Reduces the thermal expansion and contraction of PE products, improving dimensional accuracy. Calcium carbonate filling can slightly enhance UV resistance and acid/alkali tolerance.
- Eco-friendly & Low Odor: National standard calcium carbonate contains no heavy metals. Food-compliant grades are available for food packaging and disposable products.
4. Standard Physical Specifications
- Appearance: White cylindrical granules
- Density: 1.65–1.9 g/cm³
- Moisture & Volatiles: ≤0.3%
- Processing Temperature: 160–230°C
- Standard Addition Ratio: 10%–25% for films; 20%–45% for pipes/blow molding/injection molding; up to 50% for high-filling grades.
II. Mainstream Classifications
1.General-Purpose Calcium Carbonate Filler Masterbatch: The most common type on the market. Offers high cost-effectiveness and broad compatibility with most films, pipes, injection-molded, and extruded products.
2.Transparent Filler Masterbatch for Films: Features ultra-fine calcium powder with excellent dispersion and low haze. Maintains film transparency and is ideal for courier bags, packaging films, and agricultural mulch films.
3.High-Rigidity Talc PE Filler Masterbatch: Offers outstanding heat resistance and stiffness. Suitable for HDPE pipes, plastic barrels, and large blow-molded products.
4.High-Gloss Barium Sulfate Filler Masterbatch: Provides high surface gloss for the final product. Applicable to premium PE boards, plastic housings, and decorative profiles.
5.Food-Grade Eco-Friendly Filler Masterbatch: The powder complies with food contact standards, featuring low odor and minimal migration. Used for food packaging bags and disposable containers.
6.High-Fluidity Masterbatch for Drawing/Geotextiles: Features low wire breakage and minimal bleeding. Tailored for the extrusion processes of geotextile membranes, plastic ropes, and mesh nets.
III. Detailed Applications
1.Film Industry (Highest Usage Volume)
LDPE/LLDPE Blown Films: Courier bags, supermarket shopping bags, garbage bags, agricultural mulch films, packaging liners, and stretch wrap films.
Function: Increases film stiffness, reduces blocking, lowers raw material costs, and improves print adhesion.
2.Blow-Molded Hollow Products
Products: HDPE plastic barrels, chemical drums, plastic bottles, daily chemical bottles, water tanks, and turnover containers.
Function: Reduces shrinkage and sink marks, enhances barrel hardness and scratch/wear resistance, while lowering material costs.
3.PE Pipes and Profiles
Products: HDPE water supply/drainage pipes, conduit pipes, corrugated pipes, and special-shaped PE profiles.
Function: Increases pipe rigidity and ring stiffness, reduces molding shrinkage and bending deformation, and cuts production costs.
4.Extruded Drawing and Mesh Products
Products: Plastic ropes, packing straps, aquaculture nets, geogrids, bundling wires, and geotextiles.
Function: Increases strand stiffness, reduces wire breakage during drawing, and enhances the wear resistance of the final product.
5.PE Injection-Molded Products
Products: Turnover boxes, plastic pallets, stools, toys, storage boxes, and plastic housings.
Function: Resolves sink marks, shrinkage, and warpage in molded parts. Increases hardness, shortens cooling cycles, and boosts production efficiency.
6.Sheets, Thermoforming, and Foam Boards
Products: PE thermoforming rigid sheets, plastic垫板 (pallets/pads), architectural PE foam boards, and packaging liner boards.
Function: Enhances sheet stiffness, reduces heat-induced deformation, and lowers overall material costs.
7.Geotechnical Waterproofing Products
Products: Geomembranes, anti-seepage membranes, and waterproofing rolls.
Function: Improves dimensional stability, reduces tensile shrinkage, and lowers production costs.
IV. Usage Precautions
1.Adjust Ratios by Product: The addition ratio for films should not be too high; 10%–25% is recommended. Excessive amounts will increase haze and reduce tensile toughness. For rigid pipes, blow molding, and injection molding, ratios can range from 30% to 45%.
2.Store in a Dry Environment: Excessive moisture in the masterbatch can cause bubbles, water marks, and film rupture during processing.
3.Add Toughening Agents for High-Fill Formulas: Incorporating a small amount of PE toughening agent is recommended to prevent a drop in toughness and cracking in the final product.
4.Use Low-Bleeding Masterbatch for Printed Films: This prevents additives from migrating to the surface, which can cause ink fading and poor print adhesion.
