| Titre : |
Film formation of vinyl acrylic latexes ; effects of surfactant type, water and latex particle size |
| Type de document : |
texte imprimé |
| Auteurs : |
Gerald A. Vandezande, Auteur ; Alfred Rudin, Auteur |
| Année de publication : |
1996 |
| Article en page(s) : |
p. 63-73 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Coalescence (Sciences physiques)
Formation de film
Plastifiants
Polyacétate de vinyle
Polyacrylate de butyle
Revêtements
Revêtements -- Additifs
Revêtements en phase aqueuse:Peinture en phase aqueuse
Surfactants
Taille des particules
Température de transition
Transition vitreuse
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The process of film formation from an 85/15 vinyl acetate/butyl acrylate latex was studied with respect to the effects of particle size and surfactant type on minimum film formation temperature (MFFT), glass transition temperature (Tg), drying rates, and optical clarity of the coalesced films. Water plasticizes this polymer and thus only wet viscoelastic parameters and Tg values are realistic in film formation theories. The polymer is plasticized by ethoxylated alkylphenol nonionic surfactants. The surfactants with shorter ethylene oxide chains are better plasticizers and poorer steric stabilizers than their longer analogs. The type and concentration of stabilizing entities on the latex particle surfaces have very significant effects on the drying and coalescence properties of these latexes. Coalescence is somewhat faster with smaller latex particle sizes but larger particle size products dry at a faster rate than smaller ones in the absence of surfactant effects. |
| Note de contenu : |
- EXPERIMENTAL : Latex production apparatus - Production of monodisperse latexes - Seeded monodisperse latexes - Addition of surfactants to latexes - Conversion - Particle size and distribution measurements - Differential scanning calorimetry - Dynamic mechanical measurements - Minimum film forming temperature - Drying rates of latexes using a UV/vis spectrometer - Drying of latexes using gravimetric analysis
- RESULTS AND DISCUSSION : Stabilizer and surfactant effects on the Tg and minimum film forming temperatures of latexes - Drying rates of latexes - Water as a plasticizer - Combining water and surfactant effects |
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in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 860 (09/1996) . - p. 63-73
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Film formation of vinyl acrylic latexes ; effects of surfactant type, water and latex particle size in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 68, N° 860 (09/1996)
