PVC Compounds for Sheathing & Insulation Wire and Cable

PVC Compounding Process

The rigid PVC dry blend powder (called the Resin), which also contains other materials like stabilizers, additives, fillers, reinforcements, and flame retardants, must be intensively mixed in the compounding machinery. The dispersive and distributive mixing is critical, and all in compliance with well defined temperature limits.

According to the formulation, the PVC resin, plasticizer, Filler, stabilizer and other auxiliaries are put into hot mixer mixing. After 6-10 mins discharge into the cold mixer (6-10 mins) for premixing. PVC compound must use the cold mixer to prevent material stick together after the hot mixer.

The mixture material after plasticizing, mixing and dispersing evenly at around 155°C-165°C, then fed to the cold mixer. The melting cooling PVC mixture feed into twin screw extruder for compounding, then into single screw extruder for cooling and extrusion. After pelletizing, the granules temperature can be dropped to 35°C-40°C. Then after the air cooling vibrating sieve, the particle temperature drops below room temperature to be sent to the final product silo for packaging.

PVC Compounding Process

PVC cable compounds including sheathing compound and insulation compound.The sheathing compound requires good heat resistance, and the insulation compound requires good insulation.

Basic formulation for the production of PVC insulation and jacket compounds for wire and cable is generally composed of the following:

No.NameFunctionClassification
1PVC Resin//
2PlasticizerTo soft material, enhance Flexibility and make compounding material easy to processingPhthalates series: DPHP,DINP,DOP,DIDP
Others: TOTM,DOTP,DOA,Soybean oil,Chlorinated Paraffin
3StabilizerTo defer and stop the degradation of PVC resinCalcium and zinc, lead salts, fatty acid soaps, organotin, phosphatides and epoxides etc
4FillerTo lower cost and fabricate specific propertyCalcium carbonate, kaolin, talc, silica, graphite, carbon black, etc
5Flame retardantFire resistanceOrganic: some flame retardants represented by bromine, phosphorus and nitrogen, nitrogen and red phosphorus and their compounds

Inorganic: antimony trioxide, magnesium hydroxide, aluminum hydroxide, zinc borate, silicon series of flame retardant system.
6LubricantImprove the fluidity and improve the processing and surface performance, can also be used to promote melting, anti – adhesion and anti – static agent, smooth agent.Fatty acids and their esters (HSt), fatty acid amide (EBS), metal soap (CaSt), hydrocarbons (low molecular polymer), organosilicone compounds, etc.
7OthersAntioxidant: prevents plastics from aging during production
Light stabilizer:resistant to UV, strong light exposure
Colorant: Coloring plastic
/
PVC Sheathing Cable Compound formula (105℃) for reference only
Material PhrFunction
PVC: S-105100/
Bariun Stearate1Lubricant
TOTM60Plasticizer
Dibasic Lead Phthalate8Stabilizer
BPA0.5Antioxidant
Lead Stearate1Lubricant
Calcium Carbonate5Filler
Carbon Black3Filler
PVC Insulation Cable Compound formula for reference only
Material PhrFunction
PVC 100/
DIDP30Plasticizer
Phenyl Alkyl Sulfonate15Antioxidant
Organotin3Stabilizer
Chlorinated Paraffin20Plasticizer
Calcium Stearate0.5Lubricant
Lead Stearate0.5Lubricant
Calcined Clay5Filler
Calcium Carbonate5Filler
Cadmium Red3Colorant

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