Use:Anionic Rheology Modifiers for Paper Coating Applications. Composition:All Acrylic Copolymer. Specification:Appearance (8000) White Emulsion.
Solids (UNE 55-902) 28~30%
Brookfield Viscosity (Spindle #3 at 25 oC) < 200mPa.s
pH (As received@25 oC) 2.5-4.5 Additional Data:Glass Transition Temp(Tg) 45 oC Properties: an acrylate-based emulsion copolymer supplied at 30% active solids in water. The process employed in the manufacture allows fine control of the polymer structure and molecular weight to meet the specific rheology and water retention requirements of the paper and paperboard coating industries. Control of these properties can have a positive effect on runnability and surface properties. The following advantages are obtained:Newtonian flow characteristics.
Effective viscosity build in little alkali.
Liquid for ease of handling and metering.
Effective viscosity build in high solids systems.
Provides excellent water retention.
Shear tolerance. Application: should be diluted with the appropriate amount of water prior to addition of an alkali. The normal maximum concentration that can be easily handled is 0.6% in the aqueous system. Addition of an handled is 0.6% in the aqueous system.
Addition of an alkali will form an unworkable gel. When a alkali is mixed with diluted solution, agitation should be adequate to disperse the material uniformly, however, excess agitation should be avoided to prevent foaming.
Little of following normal commercial alkaline can be used with satisfactory result:
Sodium hydroxide, ammonium hydroxide,potassium hydroxide, sodium carbonate, sodium bicarbonate, monoethanolamine, diethanolamine.
Addition of excess alkaline(Ph>9) would cause solution viscosity drop down. The efficiency can be seen in following graph.
