Tementina solvent
Classified in Chemistry
Written at on English with a size of 1.76 KB.
Q5) Material protective coatings
a) Vehicle -
• fluid material in which the paint Hardens
• Polymerisation – reaction with the Air film forming – oil paints
• Evaporation of a solvent – volatile & flammable
Pigment -
• Fine insoluble particles which Produce the colouring and main body of the paint
• Primers and undercoats have more Pigments than the finish coats
• Maximum covering capabilities with Minimum thickness
Extenders -
• Control the flow & gloss of the Liquid paint
• Particle size is larger than the pigment
• Reduce the cost & increase area Of cover
b) Cellulose paints -
• Solvent based (cellulose dissolved in Acetone solvent)
• Plasticisers added to enhance Elasticity
• Synthetic resins produce gloss finish
• Flammable
Powder epoxy coatings -
• These are relatively new and Are shop applied by electrostatic methods
• Excess materials can be Recovered and re-used
• Uniform coating hardened by Baking