WIVACRYL THK 28 Paints & Coatings / Wivacryl THK 28

WIVACRYL THK 28

ACRYLIC THICKNER

WIVACRYL THK28 is an alkali swellable acrylic emulsion used as a thickener in water borne coatings. When the emulsion is diluted with water and neutralized with a base, each emulsion particle swells greatly. The emulsion clarifies under these conditions and becomes highly viscous.

WIVACRYL THK28 being a polymethacrylic acid thickener gives superior performance than conventional thickeners like CMC, HEC. Storage stability of paint with WIVACRYL THK28 is much superior than with CMC or HEC. Solutions for use are prepared rapidly since neutralization occurs instantaneously with a variety of standard bases.

It is frequently possible to incorporate WIVACRYL THK28 directly into the system to be thickened without pre neutralization. This avoids handling a viscous thickener solution. If the system contains enough free alkalinity to neutralize WIVACRYL THK28 then “in-situ” solubilization and thickening takes place. If no free alkalinity is present then alkali can be added to the system containing WIVACRYL THK28 and “in-situ” thickening will occur, WIVACRYL THK28 fully neutralizes at a pH approximately 8.0.

PROPERTIES OF THE EMULSION
Parameters	Values
Appearance	Milkywhite emulsion
Solids Content (150°C / 20 mm)	28.0 ± 0.5%
pH, when packed	2-4
Viscosity (1 percent neutralized solution.)(As per Vivacious method 2QA-TM-088) (Brookefield LVF #3/12 @ 25°C)	Min2000 CPS - Max 5000
Specific gravity, as supplied @ 25°C (Typical)	1.054
Colloidal charge	anionic

NOTE : Freezing or addition in the emulsion of soluble iron, copper or other multivalent cations may cause precipitation of polymer solids. If the emulsion is accidentally frozen and settling of the polymer is evident, the product may be recovered in useful form by diluting it with water and adding alkali to form the salt solution.

ADVANTAGES

Storage stability of paint with WIVACRYL THK28 is much superior than with CMC or HEC.

Handling is greatly simplified, compared to that required with powdered natural or synthetic cellulosic thickeners.

Solutions of WIVACRYL THK28 effectively suspend pigment, abrasives and other finely divided solids. The sodium salt of WIVACRYL THK28 is a highly efficient thickener for these suspensions and the thickened pigment suspension have good stability. Unlike conventional thickeners, salts of WIVACRYL THK28 have little flocculating action, thickened lattices are free of any creaming tendency and aqueous suspensions are free of sedimentation.

The high viscosity of WIVACRYL THK28, solutions, even at low concentrations, suggests their use to suspend pigments & fillers in water based paints, inks or other coatings of the abrasive particles in waters or polishes.

It is also useful for viscosity adjustment at emulsion & latex compound at many types.

WITHOUT WARRANTY

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