Meaning
Fully saturated straight and branched chain alkanes produced via chemical synthesis serve as external lubricants, flow promoters, processing aids and viscosity modifiers in thermoplastic formulations. Compounding line recipes incorporate synthetic aliphatic hydrocarbons, such as Fischer-Tropsch waxes or polyalphaolefins, to lower melt viscosity and reduce wall friction during extrusion and injection molding. These high purity hydrocarbon structures contain no aromatic rings or unsaturated double bonds, offering superior thermal stability compared to paraffin waxes derived from crude oil refining.
Standard resin data sheets report bulk flow properties, but internal lubrication with synthetic alkanes alters shear heating and cycle time independently of resin melt index.
Polymer Lubrication
Saturated hydrocarbon molecules migrate to the interface between polymer melt and metal mold surfaces during processing. Formulations containing synthetic aliphatic hydrocarbons reduce boundary friction, preventing melt fracture and lowering extruder head pressure during high-throughput sheet processing. Internal lubrication lowers melt viscosity at high shear rates, improving mold filling for thin-wall injection molded parts.
Precise dosing prevents phase separation and surface bloom on molded components.
Processing Impact
Excessive additive loading reduces mechanical interlocking between filler particles and polymer matrices, lowering impact strength. Dosing synthetic aliphatic hydrocarbons above target limits leads to screw slippage in extruders, resulting in unstable throughput and output pressure fluctuations. Correct concentration ranges improve pigment dispersion without reducing heat deflection temperatures or clarity in polyolefin articles.
Tooling stays cleaner because synthetic alkanes resist thermal cracking at processing temperatures.
Quality Specification
Narrow molecular weight distribution ensures consistent melting points and low volatility during high temperature processing. Synthetic production routes eliminate heavy metal residues and sulfur compounds found in mineral waxes. Standardized testing confirms narrow distillation ranges and absence of aromatic impurities for food contact approval.
