LLDPE Daqing Petrochemical DNDA‑8320
LLDPE Daqing Petrochemical DNDA‑8320 Resin
Material Introduction: LLDPE Daqing Petrochemical DNDA‑8320 is high‑flow linear low‑density polyethylene. It is mainly applied for injection‑molding process to produce various daily‑use articles and containers.
Main Applications
Household utensils: waste bins, storage boxes, containers, lids.
Daily‑use articles: toys, refrigerator accessory components.
Other applications: garbage‑bag films, bottle‑cap raw material, coating‑grade PE according to reference documents.
Performance Parameters
| Performance Category | Test Item | Test Method / Condition | Test Data / Unit | Remarks & Interpretation |
|---|---|---|---|---|
| Basic Properties | Density | GB/T 1033.2 | 0.924‑0.926 g/cm³ | Typical LLDPE density range. |
| Melt Flow Rate (MFR) | GB/T 3682 (190°C/2.16kg) | 20 g/10min | High‑flow feature adapts to injection molding, realizes fast cavity filling for thin‑wall articles. | |
| Mechanical Properties | Tensile Yield Stress | GB/T 1040.2 | ≥10 MPa | Indicator of tensile‑deformation resistance. |
| Tensile Stress at Break | GB/T 1040.2 | ≥4 MPa | Maximum stress the material can withstand before fracture. | |
| Elongation at Break | GB/T 1040.2 | ≥100%‑600% | Good toughness and ductility for large‑deformation condition; data range from different sources. | |
| Charpy Notched Impact Strength (23℃) | GB/T 1043.1 | 54‑69 kJ/m² | Good room‑temperature impact resistance; data from different sources. | |
| Appearance Property | Pellet Appearance (Discolored Pellets) | SH/T 1541 | ≤5 pcs/kg (premium grade) | Purity indicator; lower value means fewer impurities. |
| Black Pellets | SH/T 1541 | 0 pcs/kg | Same as above. | |
| Other Features | Additive | ‑ | Non‑added | Neat resin, favorable base for subsequent modification such as color‑matching. |
Injection‑Molding Process Parameters
| Process Parameters | Recommended Range | Remarks & Interpretation |
|---|---|---|
| Drying Treatment | Normally not required | Low‑hygroscopic LLDPE. Drying is unnecessary under good storage. Dry at 60‑70 °C for 1‑2 h as precaution if package damaged or high‑humidity environment. |
| Barrel Temperature | 160‑220 °C | Temperature rises from rear zone to front zone. Reference setting: rear 160‑180°C, middle 180‑200°C, front 190‑220°C. Start debugging at medium‑low temperature to avoid thermal degradation for this high‑MFR grade. |
| Mold Temperature | 30‑60 °C | Low mold temperature (30‑40°C) shortens cycle time and prevents deformation; higher mold temperature improves surface gloss and reduces internal stress. |
| Injection Pressure | Medium pressure | High flowability permits medium‑low injection pressure. Excessive pressure causes flash; adjust according to product structure and dimension. |
| Injection Speed | Medium‑high speed | Fast injection takes advantage of high flowability, improves productivity, especially for thin‑wall parts. |
| Holding Pressure | 40%‑60% of injection pressure | Avoid excessive holding pressure and long holding time to reduce internal stress. |
| Back Pressure | 0.5‑1.5 MPa | Low back pressure for melt compaction; excessive back pressure generates redundant shear heat. |
| Screw Speed | 50‑100 rpm | Moderate rotating speed, prevent excessive shear heat accumulation. |
Disclaimer: All above data is for reference only.
