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Type of Coating

13 Mar

Type of Coating based on curing / drying time divided to 3 types :

# Physically curing coating

# Oxidation curing coating

# Chemically curing coating

# Physically curing coating are coating which only cure by evaporation of the solvent. Types of Physically cured coating are : Chlorinated Rubber (CR), Tar / Bitumen / Asphalt, Latex / Emulsion, Vinyl acrylic emulsion

# Oxidation curing coating are coating which cure by evaporation + O2 (oxide/oxidation). Types of Oxidation cured coating are : Alkyd, Epoxy Ester, Phenolic, Phenolic Epoxy

# Chemically curing coating are coating which cure by polymerization (chemically induced – agent solvent). Types of chemically cured coating are :

Epoxy (two component),

  • Advantages are : Chemical resistance, Hardness
  • AdhesionLimitations are : Overcoat restriction, color, chalking (if used for top coat)
  • Usually use for/in : Structural steel, vessel linings

Coal Tar Epoxy,

  • Advantages are : Water resistance, chemical resistance
  • Limitations are : Fading / chalking, color only black
  • Usually used for/in : Crude oil tanks, ship, jetty

Epoxy Emulsion,

  • Advantages are : Low solvent color, low toxic, durable
  • Limitations are : Reduced water resistance
  • Usually used for/in : Sensitive environment

Vinyl Ester / Polyester,

  • Advantages are : Excellent gloss, high build, water / acid resistance
  • Limitations are : Shrinkage, Reaction unstable, alkaline conditions
  • Usually used for/in : Tank linings, FRP (GRP) product

Urethane,

  • Advantages are : Water / acid resistance, abrasion resistance, tolerance high RH
  • Limitations are : Pack stability, limited adhesion
  • Usually used for/in : Offshore platform, topcoat over epoxy, wood/concrete floor

Polyurethane,

  • Advantages are : Good chemical/solvent resistance, abrasive resistance, flexibility, color gloss retention
  • Limitations are : Isocyanate component as hazardous
  • Usually used for/in : Tank Linings, floor finishes, gloss over epoxy

Epoxy Phenolic > specialty heat converting one component

  • Usually used for/in : Interior of down hole tubing, process vessels
  • Epoxy Phenolic baking schedule : Set up 95’C (200’F), Final 165′-200’C (325′-500’F)

High bake Phenolic : Vinyl (Butyral) Wash Primer (PVB) > specialty primer uses acid to promote adhesion

 
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Ditulis oleh pada 13 Maret 2013 in All about Coating

 

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