PP Huajin Chemical K7726H
PP Huajin Chemical K7726H Resin
Material Introduction: PP Huajin Chemical K7726H is high‑flow impact‑resistant block‑copolymer polypropylene. It is well‑received in the market for favorable stiffness‑toughness balance, low odor and excellent processability.
Main Applications
Home appliances: Mainly applied for washing machine inner tubs, outer tubs and relevant components. Its low‑odor feature is particularly suitable for home appliances with high hygiene‑safety requirements.
Automotive industry: Used for automotive interior and exterior parts such as bumpers, instrument panels and interior trims, frequently serving as base resin for modified compounds of above‑mentioned components.
Industrial parts & daily‑use articles: Also applied for industrial products such as storage‑battery housings, as well as daily‑use goods including furniture, toys, toolboxes, travel cases and various packaging containers.
Performance Parameters
| Performance Category | Test Item | Typical Value | Test Condition / Reference Standard | Remarks & Interpretation |
|---|---|---|---|---|
| Physical Properties | Melt Flow Rate(MFR) | 16‑30 or 29.9 g/10min | 230℃/2.16kg | High‑flow block‑copolymer PP |
| Mechanical Properties | Tensile Yield Strength | 26.4 MPa | ‑ | ‑ |
| Flexural Modulus | 1448 MPa | ‑ | ‑ | |
| Izod Notched Impact Strength | 15.6 kJ/m² (23℃) | ‑ | ‑ | |
| Thermal Properties | Heat‑Distortion Temperature(HDT) | 95‑100 ℃ | 0.45 MPa or 1.82 MPa | ‑ |
| Other Properties | Yellow Index | ‑2.3 △Y.I. | ‑ | ‑ |
Processing Parameters
| Processing Item | Reference Range | Remarks & Instructions |
|---|---|---|
| Drying Treatment | Normally not required | PP absorbs negligible moisture. Drying is unnecessary under proper storage. Dry at 80‑100 ℃ for 1‑2 h if material gets damp. |
| Barrel Temperature | 180‑280℃ | Zone example: rear zone 180‑200℃；middle zone 200‑230℃；front zone 210‑250℃. Adopt relatively low temperature for high‑flow grade to avoid material degradation. |
| Mold Temperature | 40‑80℃ | Recommended:50‑60℃. Higher mold temperature improves surface gloss, dimensional stability and weld‑line strength; lower mold temperature shortens molding cycle. |
| Injection Pressure | 60‑100 MPa | Adjust per flow‑length and part structure. Appropriately reduce injection pressure for high‑flow material. |
| Injection Speed | Medium‑high speed | High‑speed injection helps reduce internal stress, especially for thin‑wall articles. Excessively high speed may trigger surface defects such as gas marks. |
| Holding Pressure & Time | 30%‑60% of injection pressure | Sufficient holding pressure reduces shrinkage and sink marks. Avoid overly long holding time to prevent excessive internal stress. |
| Back Pressure | 0.5‑1.0 MPa | Moderate back‑pressure improves melt homogenization and venting. Not mandatory; too low back‑pressure may cause air entrapment in melt. |
| Screw Speed | 50‑100 rpm | Avoid excessive screw speed to prevent shear‑induced overheating. |
Disclaimer: All above data is for reference only.
