LLDPE Sinopec Maoming M2720A
LLDPE Sinopec Maoming M2720A Resin
Material Introduction: LLDPE Sinopec Maoming M2720A is a versatile linear low‑density polyethylene. It is classified as injection‑molding grade and coating grade, and also applicable for blow‑molding and film‑grade applications.
Main Applications
Special‑purpose bottle cap material: bottle caps requiring good sealing performance and moldability.
Nose bridge strips for face masks: strength and toughness provide stable support and comfortable wearing experience.
Carrier for color masterbatch & functional masterbatch: impart target color and functional properties to various plastic products.
Film products: suitable for certain film‑grade applications.
Performance Parameters
| Performance Category | Test Item | Test Method / Condition | Value & Unit | Remarks & Interpretation |
|---|---|---|---|---|
| Basic Properties | Density | ASTM D1505 | 0.920±0.003 g/cm³ | Typical density range for LLDPE. |
| Melt Flow Rate (MFR) | ASTM D1238 (190°C/2.16 kg) | 2.0±0.5 g/10min | Good melt flowability, suitable for film processing. | |
| Mechanical Properties | Tensile Yield Stress | ISO 527 | ≥10 MPa | Indicator of tensile‑deformation resistance. |
| Tensile Strength at Break | ISO 527 | ≥4 MPa | Maximum stress the material can withstand before fracture. | |
| Nominal Tensile Strain at Break | ISO 527 | ≥100 % | Good toughness and ductility; tolerates large deformation without fracture. | |
| Film Appearance | Fish‑eye (0.8 mm) | ‑ | ≤8 pcs / 1520 cm² | Film quality indicator; lower value means better uniformity and fewer impurities. |
| Fish‑eye (0.4 mm) | ‑ | ≤40 pcs / 1520 cm² | Same interpretation as above. |
Blown‑Film Processing
For mainstream blown‑film extrusion, temperature, pressure and other parameters shall be optimized according to equipment, film thickness and performance requirements.
‑ Extrusion Temperature: Typically 160‑170 °C for LDPE blown‑film; uniform die‑head temperature is required. Excessively high temperature causes resin degradation and brittle film; insufficient temperature leads to poor plasticization, low film tensile strength, poor surface gloss & transparency, wood‑grain‑like patterns and unmelted crystal nuclei (fish‑eyes). ‑ Blow‑up ratio: Key control parameter for blown‑film production, defined as ratio of bubble diameter to annular die diameter. Higher blow‑up ratio improves transverse strength, yet excessive value may trigger bubble instability and film wrinkles. For PE anti‑drip greenhouse film, blow‑up ratio is controlled within 2‑4. ‑ Screw Speed: For PE anti‑drip greenhouse film production, screw speed is set at 30‑50 r/min.
Blown‑Film Processing Notes
‑ Shear sensitivity: LLDPE features narrow molecular‑weight distribution and short side‑chains with low shear sensitivity. It maintains higher viscosity under shearing (e.g. extrusion), making it more difficult to process than LDPE of identical MFR. ‑ Equipment requirements: Extruders for LLDPE may require higher driving power, higher melt temperature and pressure. Die gap shall be widened (e.g. from LDPE 0.024‑0.040 inch to 0.060‑0.10 inch) to avoid excessive back‑pressure and melt fracture. ‑ Bubble stability: LLDPE blown‑film bubble stability is inferior to LDPE. Dual‑lip air ring is recommended to improve cooling and bubble stability. ‑ Blending for better processability: Many film producers blend LLDPE with LDPE (e.g. 50 % each) to optimize processability and raise output capacity.
Disclaimer: All above data is for reference only.
