PVC Inner‑Mongolia Junzheng SG‑5
PVC Inner‑Mongolia Junzheng SG‑5
Material Introduction: PVC Inner‑Mongolia Junzheng SG‑5 is a general‑purpose polyvinyl chloride resin produced by suspension‑polymerization, normally in white‑powder form. It is a medium‑polymerization‑degree resin with balanced processability, favorable physical‑mechanical properties and excellent chemical stability, so it has very wide applications.
Main Applications
Rigid products: rigid pipes (building pipes, agricultural irrigation pipes), special‑shaped profiles (door‑window profiles), boards, sheets, injection‑molded pipe fittings, etc.
Soft products: insulation layers and sheaths for wires and cables, artificial leather, films, etc.
Other fields: packaging materials, daily‑consumer goods, dip‑molded products (mixed with emulsion resin), electroplating‑grade PVC products, etc.
Physical Properties
| Test Item | Test Standard | Unit | Reference Value / Range | Remarks |
|---|---|---|---|---|
| Average Degree of Polymerization | ‑ | P | 1000‑1100 or 980‑1080 | or viscosity number 107‑118 mL/g, K‑Value 66‑68 |
| Bulk Density | ‑ | g/ml | ≥0.48 or min 0.48 | Common range 0.47‑0.57, min 0.53 |
| Volatile Matter Content | ‑ | % | ≤0.4 or max 0.30 | Including water |
| Sieve Residue (0.25 mm sieve) | ‑ | % | max 1.0 or ≤2.0 | |
| Sieve Residue (0.063 mm sieve) | ‑ | % | min 95 or ≥90 | |
| Fish‑eye Count | ‑ | pcs/400cm² | ≤20 or max 10 | or ≤10 pcs/400cm² |
| Plasticizer Absorption | ‑ | g/100g resin | ≥19 or min 25 | Common ≥22 |
| Impurity Particle Count | ‑ | pcs/100g | ≤16 or max 16 | |
| Whiteness (160℃, 10 min) | ‑ | % | ≥78 or 80 | Common ≥74 |
| Residual Vinyl Chloride Monomer | ‑ | μg/g (ppm) | ≤5 or 1 | Common ≤3 |
| Thermal Stability Time | ‑ | min | ≥8 |
Processing Parameters
| Process Step / Parameter | Unit / Condition | Reference Value / Range | Remarks & Description |
|---|---|---|---|
| Material Pre‑treatment | ‑ | Normally no drying required | Proper drying shall be performed if moisture‑absorbed |
| Extruder Barrel Temperature (Rigid Products) | ‑ | Note: PVC is heat‑sensitive; thermal stabilizer must be added | |
| Feed Section | ℃ | 150‑165 | For reference; adjust according to formulation and equipment |
| Compression Section | ℃ | 165‑175 | For reference; adjust according to formulation and equipment |
| Metering Section | ℃ | 175‑185 | For reference; adjust according to formulation and equipment |
| Extrusion Die Temperature | ℃ | 180‑190 | For reference; adjust according to formulation and equipment |
| Injection Molding Barrel Temperature | ‑ | Note: PVC is heat‑sensitive; thermal stabilizer must be added | |
| Rear zone | ℃ | 150‑160 | For reference; adjust according to formulation and equipment |
| Middle zone | ℃ | 160‑170 | For reference; adjust according to formulation and equipment |
| Front zone | ℃ | 170‑180 (do not exceed 190 °C) | For reference; adjust according to formulation and equipment |
| Injection Nozzle Temperature | ℃ | 160‑170 | For reference; adjust according to formulation and equipment |
| Melt Temperature | ℃ | 170‑190 | Never exceed 210 °C to avoid decomposition |
| Injection Pressure | bar | up to 1500 | |
| Screw Speed | rpm | 20‑50 | Avoid high speed to prevent shear‑caused overheating |
| Mold Temperature | ℃ | 30‑60 | |
| Thermal Stability Reminder | ‑ | Stabilizer addition is mandatory | PVC tends to decompose under over‑heating or long‑time heat exposure. Sufficient high‑efficiency thermal stabilizer shall be added into formulation. |
Disclaimer: All above data is for reference only.
