PVC Zhongtai Xinjiang SG‑8
PVC Zhongtai Xinjiang SG‑8
Material Introduction: PVC Zhongtai Xinjiang SG‑8 is a general‑purpose polyvinyl chloride resin produced by suspension‑polymerization process. It is well‑known for excellent processing flowability, good product transparency, favorable chemical stability and easy‑processing performance.
Main Applications
Transparent products: transparent sheets, food‑contact packaging containers (relevant hygienic standards shall be complied with), etc.
Injection‑molded products: complex‑shaped pipe fittings, valves, drip‑irrigation components, household‑appliance housings, toys, etc. Especially suitable for injection‑molded parts requiring high flowability and certain toughness, such as special‑purpose valves and drip‑irrigation components mentioned in some patents.
Plastic alloys & blending: used as blending resin for PVC alloys and other polymer materials.
Other fields: perchloroethylene resin, profiles, soft films and so on.
Physical Properties
| Test Item | Test Standard | Unit | Reference Value / Range | Remarks |
|---|---|---|---|---|
| Average Degree of Polymerization | GB/T 5761 Appendix A | P | 650‑740 | |
| Viscosity Number | GB/T 3401 | mL/g | 73‑86 | |
| K‑Value | GB/T 3401 | ‑ | 55‑59 | |
| Bulk Density | ‑ | g/mL | 0.57±0.04 | |
| Volatile Matter Content (including water) | ‑ | % | ≤0.30 | |
| Sieve Residue (0.25 mm sieve) | ‑ | % | ≤0.1 | |
| Sieve Residue (0.063 mm sieve) | ‑ | % | ‑ | |
| Fish‑eye Count | ‑ | pcs/100cm² | ≤12 | |
| Plasticizer Absorption | ‑ | g/100g resin | ≥10 | |
| Impurity Particle Count | ‑ | pcs/100g | ≤50 | |
| Whiteness (160℃, 10 min) | ‑ | % | ≥75 | |
| Residual Vinyl Chloride Monomer (VCM) | ‑ | 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 is needed if moisture‑absorbed |
| High‑Speed Mixer Discharge Temperature | ℃ | 105‑120 | Ensure uniform dispersion of each component |
| Cooling‑Mix Discharge Temperature | ℃ | 30‑45 | Cool to prevent caking and thermal degradation |
| Injection Molding Barrel Temperature | ‑ | Note: PVC is heat‑sensitive; thermal stabilizer must be added | |
| Rear zone (Feed section) | ℃ | 150‑165 | For reference; adjust according to formulation and equipment |
| Middle zone (Compression section) | ℃ | 160‑175 | For reference; adjust according to formulation and equipment |
| Front zone (Metering section) | ℃ | 166‑175 (do not exceed 185 °C) | For reference; adjust according to formulation and equipment |
| Injection Nozzle Temperature | ℃ | 160‑170 (reference) | For reference; adjust according to formulation and equipment |
| Melt Temperature | ℃ | 170‑190 (reference) | Never exceed 210 °C to avoid decomposition |
| Injection Pressure | bar | Adjust by equipment and product | Avoid excessive pressure to prevent high internal stress |
| Screw Speed | rpm | 20‑50 (reference) | Avoid high speed to prevent shear overheating |
| Mold Temperature | ℃ | 30‑60 (reference) | |
| Extrusion‑Pelletizing Barrel Temperature | ‑ | Note: PVC is heat‑sensitive; thermal stabilizer must be added | |
| Feed Section | ℃ | 150‑165 | For reference; adjust according to formulation and equipment |
| Compression Section | ℃ | 160‑170 (reference) | For reference; adjust according to formulation and equipment |
| Metering Section | ℃ | 165‑175 | For reference; adjust according to formulation and equipment |
| Extruder Die Temperature | ℃ | 166‑175 | For reference; adjust according to formulation and equipment |
| Thermal Stability Reminder | ‑ | Stabilizer addition is mandatory | PVC decomposes easily under over‑heating or long‑term heat exposure. Sufficient high‑efficiency thermal stabilizer shall be added into formulation. |
Disclaimer: All above data is for reference only
