LDPE Shanghai Petrochemical N220
LDPE Shanghai Petrochemical N220 Resin
Material Introduction: LDPE Shanghai Petrochemical N220 is low‑density polyethylene with high elongation at break. It is mainly applied in blown‑film field, and widely used for agricultural films.
Main Applications
Agricultural films: agricultural film, mulch film.
Packaging films: applicable for general blown‑film products according to reference documents.
Performance Parameters
| Performance Category | Test Item | Test Method / Condition | Test Data / Unit | Remarks & Interpretation |
|---|---|---|---|---|
| Basic Properties | Density | ASTM D1505 / GB/T 1033 | 0.920‑0.922 g/cm³ | Typical LDPE density range. |
| Melt Flow Rate (MFR) | ASTM D1238(190°C/2.16kg) / GB/T 3682 | 2.2 g/10min（range：1.8‑2.6 g/10min） | Good melt strength, well‑suited for blown‑film forming. | |
| Mechanical Properties | Tensile Strength | ASTM D638 / GB/T 1040 | 11.0 MPa or ＞11.0 MPa | Provides sufficient strength for film production, transportation and service. |
| Elongation at Break | ASTM D638 / GB/T 1040 | 500% / 550% / ＞500% | Excellent toughness and ductility for large‑deformation resistance. | |
| Optical Properties | Haze | GB/T 2410 / ASTM D1003 | 16% or ＜16% | Film transparency index; lower value means higher transparency. |
| Film Appearance | Fish‑eye (0.4mm) | GB 11115 | 20 pcs/1200cm² or ＜8.00 pcs/1200cm² | Film quality indicator; lower value represents better uniformity and fewer impurities. |
| Impurities (≥0.1mm) | GB 11115 | ≤19 pcs/100g | Purity evaluation index for raw resin. | |
| Other Properties | Cleanliness | SH/T 1541 | 15 pcs/kg | Indicator for material cleanliness. |
| Moisture Content | ‑ | Qualified | Raw material moisture meets specification requirements. |
Injection‑Molding Process Parameters
| Process Parameters | Recommended Range | Remarks |
|---|---|---|
| Barrel Temperature | 160‑210 °C | Temperature increases from rear zone to front zone. LDPE melt is prone to thermal‑oxidative degradation when exposed to oxygen. |
| Nozzle Temperature | 180‑200 °C | ‑ |
| Mold Temperature | 20‑60 °C | ‑ |
| Injection Pressure | Medium‑high pressure | Relatively lower flowability vs injection‑molding grade LDPE, moderate pressure increase may be required. |
| Injection Speed | Medium speed | ‑ |
| Back Pressure | 0.5‑1.0 MPa | High back pressure is unnecessary. |
| Screw Speed | 50‑100 rpm | Prevent excessive shear heat build‑up. |
| Drying Treatment | Normally not required | Dry at 80 ℃ for 1 h under poor storage conditions. |
Disclaimer: All above data is for reference only.
