How Plastics Are Made(3)-Additives

When plastics emerge from reactors, they may have the desired properties for a commercial product or not. The inclusion of additives may impart to plastics specific properties. Some polymers incorporate additive during manufacture. Other polymers include additives during processing into their finished parts. Additives are incorporated into polymers to alter and improve basic mechanical, physical or chemical properties. Additives are also used to protect the polymer from the degrading effects of light, heat, or bacteria; to change such polymer processing properties such as melt flow; to provide product color; and to provide special characteristics such as improved surface appearance, reduced friction, and flame retardancy.

Types of Additives:

  • Antioxidants: for plastic processing and outside application where weathering resistance is needed
  • Colorants: for colored plastic parts
  • Foaming agents: for expanded polystyrene cups and building board and for polyurethane carpet underlayment
  • Plasticizers: used in wire insulation, flooring, gutters, and some films
  • Lubricants: used for making fibers
  • Anti-stats: to reduce dust collection by static electricity attraction
  • Antimicrobials: used for shower curtains and wall coverings
  • Flame retardants: to improve the safety of wire and cable coverings and cultured marble
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Related posts:

  1. How Plastics Are Made(2)-The Structure of Polymers
  2. How Plastics Are Made(1)-The Basics of Plastic Manufacturing
  3. The History and Future of Plastics (3)-The Development of New Plastics
  4. Science of Plastics
  5. How is Plastic Made