PVC Nantong Zhengde ZD7
PVC Nantong Zhengde ZD7
Material Introduction: PVC Nantong Zhengde ZD7 is a transparent, medium‑soft‑hardness polyvinyl chloride material suitable for processing methods such as injection molding. It features good thermal stability and high elongation at break.
Main Applications
Eye masks, wheels, woven bags, injection‑molded plastic bags.
Physical Properties
| Performance Category | Test Item | Test Condition | Reference Value | Unit | Remarks |
|---|---|---|---|---|---|
| Mechanical Properties | Hardness (Shore A) | ‑ | ≤80 (MF, MT); ＞80 (MD) | ‑ | MF, MT, MD may stand for different test directions or conditions |
| Tensile Strength | ‑ | ≥13.0 (MF, MT); ≥18.0 (MD) | MPa | ||
| Elongation at Break | ‑ | ≥250 (MF, MT); ≥200 (MD) | % | ||
| Thermal Stability Time @180℃ | ‑ | ≥40 | min | ||
| Other Properties | Water Absorption | ‑ | ≤0.3 | % | |
| Ash Content | ‑ | ≤1.0 | mg/g | ||
| Residual Vinyl Chloride Monomer (VCM) | ‑ | ≤1.0 | μg/g | ||
| Reducing Substances (0.02 mol/L KMnO₄ consumption) | 0.02mol/L KMnO₄ consumption | ≤0.3 | ml/20ml | ||
| Acidity‑Alkalinity (pH difference vs blank solution) | ‑ | ≤1.0 | ‑ | ||
| Non‑volatile Matter | ‑ | ≤2.0 | mg/100ml | ||
| Heavy Metals | ‑ | ≤0.3 | μg/ml | ||
| Zinc (Zn) | ‑ | ＜0.4 | μg/ml | ||
| UV Absorbance | 230‑360 nm | ≤0.3 | ‑ | ||
| Alcohol‑soluble Substances (DEHP) | ‑ | ≤10 | mg/100ml | ||
| Color Appearance | ‑ | Clear and colorless | ‑ |
Injection Molding Process Parameters
| Process Step / Parameter | Unit / Condition | Reference Value / Range | Remarks & Description |
|---|---|---|---|
| Material Pre‑treatment | ‑ | Normally no drying required | If damp, dry properly; some references suggest drying at approx. 85 °C for over 2 hours, proceed with careful evaluation |
| Injection Barrel Temperature | ‑ | PVC is highly heat‑sensitive; thermal stabilizer must be added and temperature strictly controlled | |
| Rear zone (Feed section) | ℃ | 140‑160 (or 150‑165) | For reference, avoid premature plasticization |
| Middle zone (Compression section) | ℃ | 160‑170 (or 160‑175) | For reference |
| Front zone (Metering section) | ℃ | 170‑180 (do not exceed 185 or 190 °C) | For reference; over‑temperature must be avoided |
| Melt Temperature | ℃ | 160‑180 or 185‑205 | Never exceed 210 °C to prevent decomposition |
| Mold Temperature | ℃ | 20‑50 or 30‑45 | Lower mold temperature shortens cycle time and reduces deformation |
| Injection Pressure | bar | up to 1500 | Higher pressure benefits mold filling |
| Injection Speed | ‑ | Medium‑low speed | High speed may cause shear‑induced thermal degradation |
| Screw Speed | rpm | 20‑50 | High speed shall be avoided to prevent shear overheating |
| Back Pressure | bar | 0.5‑1.5 or keep as low as possible | Improves melt homogeneity, yet excessive back pressure generates heat |
| Thermal Stability Reminder | ‑ | Stabilizer addition is mandatory | Sufficient high‑efficiency thermal stabilizer shall be included in formulation |
| Shutdown Cleaning | ‑ | Thorough cleaning required | Purge barrel with PE / PP purge compound on shutdown to avoid decomposed PVC residue |
Disclaimer: All above data is for reference only.
