PVC Qinghai Yihua SG‑5
PVC Qinghai Yihua SG‑5
Material Introduction: PVC Qinghai Yihua SG‑5 is a widely‑used general‑purpose polyvinyl chloride resin produced by suspension‑polymerization. It delivers balanced processability, favorable physical‑mechanical properties, excellent chemical stability and good electrical insulation performance.
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 (raincoats, tablecloths, curtains, greenhouse films), etc.
Other fields: packaging materials (packaging bags, plastic containers), daily‑consumer goods (various plastic articles for daily use), etc.
Physical Properties
| Test Item | Test Standard | Unit | Reference Value / Range | Remarks |
|---|---|---|---|---|
| Average Degree of Polymerization | GB/T 5761‑2006 | P | 1030±50 | or viscosity number 107‑118 mL/g |
| K‑Value | GB/T 3401 | ‑ | 66‑68 | |
| Bulk Density | ‑ | g/ml | 0.54±0.03 | |
| Volatile Matter Content | ‑ | % | ≤0.30 | Including water |
| Sieve Residue (0.25 mm sieve) | ‑ | % | ≤0.1 | |
| Sieve Residue (0.063 mm sieve) | ‑ | % | ≥90 | |
| Fish‑eye Count | ‑ | pcs/400cm² | ≤20 | or ≤5 pcs/100cm² |
| Plasticizer Absorption | ‑ | g/100g resin | ≥17 | |
| Impurity Particle Count | ‑ | pcs/100g | ≤50 or ≤30 | |
| Whiteness (160℃, 10 min) | ‑ | % | ≥78 | |
| Residual Vinyl Chloride Monomer | ‑ | μg/g (ppm) | ≤1 | |
| Dry‑Flow Time | ‑ | s/400cm³ | 2.0‑6.0 |
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.
