Titre : |
Tackifying resin dispersions : more than just soap and water |
Type de document : |
texte imprimé |
Auteurs : |
George J. Kutsek, Auteur |
Année de publication : |
1996 |
Article en page(s) : |
p. 24-30 |
Note générale : |
Bibliogr. |
Langues : |
Américain (ame) |
Catégories : |
Adhésifs -- Stockage Adhésifs en phase aqueuse Antimicrobiens Antioxydants Gommes et résines Matières premières Plastifiants Procédés de fabrication Rhéologie Stabilisants (chimie) Surfactants
|
Index. décimale : |
668.3 Adhésifs et produits semblables |
Résumé : |
Resin dispersions are widely used in water based adhesives to impart specific properties. A resin dispersion is a stable heterogeneous system of resin droplets in water. The resin phase is referred to as the dispersed, internal or discontinuous phase. The surrounding water is the external or continuous phase. The diameter of the resin droplets is less than one micron. Coalescence of the particles is prevented by the repulsive force arising from like surface charges on the particles. This charge is provided by the surfactant used to emulsify the resin. Surfactants are surface active agents that decrease interfacial tension and aid the process of emulsification.
Hydrocarbon resins are low-molecular-weight thermoplastic polymers derived from cracked petroleum distillates, terpene fractions, coal tar and a variety of pure monomers. They are neutral materials with [less than]1 acid number and [less than]2 saponification number. Naturally occurring rosins, rosin esters of aromatic and aliphatic alcohols, and polymerized rosins are also suitable for water-based tackifiers.
A dispersion must be selected that contains a resin suited to the latex polymer, and a dispersion system compatible with that of the latex. Base resin selection is most important, since it affects characteristics of the finished adhesive, including tack, wettability, plasticization and specific adhesion. Compatibility and temperature performance properties are major considerations in selecting a base resin. A less compatible resin may be selected if the high temperature performance it provides outweighs having a fully compatible resin. |
Note de contenu : |
- PHYSICAL PROPERTIES OF DISPERSIONS : Solids content - Particle size - Specific gravity - pH - Viscosity - Grit - Mechanical stability - Ion tolerance
- METHOD OF MANUFACTURE
- BATCH VS CONTINUOUS EMULSIFICATION
- RESIN : Hydrocarbon resins - Naturally occuring rosins - Wood rosin - Gum rosin - Tall oil rosin - Rosin esters
- ANTIOXIDANTS
- PLASTICIZERS
- SURFACTANTS : Anionic surfactants - Cationic surfactants - Amphoteric or zwitterionic surfactants - nonionics -
- PROTECTIVE COLLOIDS, THICKENERS AND ADDITIVES : Sodium carboxymethylcellulose - Gum arabic, gum karaya and guar gum - Methylcellulose - Polyvinyl alcohol - Starch - Casein - Polyacrylic acid salts
- BIOCIDES
- STABILITY : Steric stabilization - pH - Viscosity - Specific gravity - Particle size - Multivalent cations - Mechanical shear - Temperature - Loss of stabilizer - Surface evaporation - Biological - Intentional de-emulsification
- STORAGE AND HANDLING : Shipping - Bulk storage - Temperature - Piping - Pumps - Filtration - Sampling - Chemical |
En ligne : |
https://drive.google.com/file/d/1gPFYGhY18j6DZ3mkjsZ2GY5Euqh8vXUw/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20504 |
in ADHESIVES AGE > Vol. 39, N° 7 (06/1996) . - p. 24-30