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Film Formation - PowerPoint PPT Presentation


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Film Formation. &. VOC. As water evaporates , tiny latex particles come into contact . If the particles are sufficiently soft, the film of water between the particles that pulls them together causes them to fuse into a continuous , useful film.

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Presentation Transcript
latex film formation is critical coalescence

As waterevaporates, tinylatexparticlescomeintocontact.

Iftheparticlesaresufficiently soft, the film ofwaterbetweentheparticlesthatpullsthemtogethercausesthemtofuseinto a continuous, useful film.

Latex Film Formation is Critical! (Coalescence)
latex hardness softness performance conflict

Latex particles must be soft to fuse (coalesce)

into a continuous film.

Soft Latex = Poor Blocking & Dirt Pick-up

Hard Latex + Coalescing solvents temporarily

soften and assist in film formation.

Latex Hardness/Softness Performance Conflict
coalescent solvents vs plasticizers

Coalescent Solvents - help hard latex film form and will evaporate from film.

    • Dry film retains ‘toughness’
  • Plasticizers- will soften a hard latex and help film formation, but does not evaporate.
    • Dry film can be ‘softened’
Coalescent Solvents vs. Plasticizers
slide5

“VOCs” Volatile Organic Compounds

These are hydrocarbons emitted by many products, which contribute to ozone formation.

5

sources functions of voc

Coalescing Solvents

    • Temporarily softens latex particles to aid film formation; especially important at low temp.
  • Glycol
    • “Likes” water; slows dry time; lengthens open time, improves lapping.
  • Additives
    • “Carriers” for defoamers, biocides, etc.
  • Float
    • Inhibits latex paint skinning.
Sources & Functions of VOC
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