MANU 3317-Notes 4

Card Set Information

Author:
mackoy
ID:
111736
Filename:
MANU 3317-Notes 4
Updated:
2011-10-24 11:52:15
Tags:
plastics
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Description:
Additives
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  1. why use additives, reinforcements, and fillers
    • to improve processability (lubricant)
    • to reduce materials costs (talc filler)
    • to reduce shrinkage (wood flour)
    • to improve surface finish
    • alter thermal properties: expansion coeff,flammability, heat transfer
    • to improve electrical properties
    • to prevent degradation during processing
    • for color or tint
    • to improve mechanical properties (modulus,strength, etc)
    • to lower the coefficient of friction
  2. additives
    • may be distributed in matrix (ex. color)
    • may bloom to surface (ex. antistat, slip)
  3. additives for processing
    • antioxidants – prevent chain scission
    • heat stabilizers – prevent degradation
    • processing aids – increase productivity
    • lubricants – allow processing
    • coupling agents – improve performance
    • curing agents – allow/improve productivity
    • foaming / blowing agents – shape modifiers
  4. additives ‐ performance
    • flame retardants – various techniques
    • antistatics – various techniques
    • impact modifiers – ‘rubber’ modified
    • plasticizers – rigid to flexible
    • UV stabilizers ‐ consumable
  5. thixotropic additive
    • fluid when agitated,thickens at rest
    • ex. paint
  6. LETDOWN
    = ratio used in coloring plastics with coloring concentrates
  7. tracer additives
    anti-counterfeit taggants = uniquely encoded particles for each customer or app
  8. WPC = wood plastic composites
    => wood flour + plastic granules = pallwood
  9. additives - appearance
    • colorants – tricky area
    • nucleating agents ‐ clarifiers
  10. Fillers
    = main purpose cost reduction (i.e. dollar store)
  11. additives – unintended outcomes
    • loss of FDA
    • impaired sealability / weldability
    • impaired printability
    • loss of physical properties
    • new processability limitations
    • can conflict when used simultaneously

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