Molding Material Additives

There are many molding material additives for molding materials, which are mainly used to improve the processing properties, mechanical properties, heat resistance, wear resistance, corrosion resistance, etc. of the materials.

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Molding Material Additives
Additive Type	Primary Function	Typical Examples	Application Examples
Reinforcing Agents	Improve strength, rigidity, dimensional stability	Glass fiber (GF), carbon fiber (CF), talc, mica	PA66+GF30, automotive parts, electronic housings
Toughening Agents	Enhance impact resistance	EPDM, POE, MBS core-shell rubber	Impact-modified PP, PC/ABS alloys, tool handles
Lubricants	Improve flow and mold release	Zinc stearate, silicone oil, PTFE	PVC pipes, high-gloss ABS, wear-resistant POM gears
Heat Stabilizers	Prevent thermal degradation	Lead-based (traditional), calcium-zinc (eco-friendly), organotin	PVC windows, cable sheathing
Antioxidants	Delay oxidative aging	Phenolic (BHT), phosphite esters	PE films, PP injection-molded parts
UV Stabilizers	Prevent UV degradation	Hindered amine (HALS), benzotriazoles	Outdoor plastics (e.g., garden furniture, car bumpers)
Flame Retardants	Improve fire resistance	Brominated (decabromodiphenyl ether), phosphorus-based (red phosphorus), aluminum hydroxide	Electronics housings (ABS), wires/cables (PE)
Antistatic Agents	Reduce static buildup	Quaternary ammonium salts, carbon black, glycerol monostearate	Electronic packaging, medical plastics
Foaming Agents	Create microcellular structure	AC foamer (azodicarbonamide), physical foaming agents (CO₂)	EVA shoe soles, PU foam insulation
Colorants	Provide color	Titanium dioxide (TiO₂), phthalocyanine blue, carbon black	Toys, appliance housings, packaging
Coupling Agents	Enhance filler-matrix bonding	Silane coupling agents, titanates	Glass fiber-reinforced plastics (GFRP)
Antimicrobial Agents	Inhibit microbial growth	Silver ions, organic biocides (e.g., triclosan)	Medical devices, food packaging
Light Diffusers	Uniform light scattering	Silica, silicone microspheres	LED covers, light guide panels

Additional Notes

Synergistic Effects: Some additives require combined use (e.g., antioxidants + UV stabilizers for outdoor materials).
Eco-Friendly Trends: Halogen-free flame retardants and Ca/Zn stabilizers are replacing toxic alternatives.
Special Processes: 3D printing plastics may need rheology modifiers (e.g., nanoclay) for precision.

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