Coating Additives

Coating Additives

K-SPERSEŽ DISPERSING AGENTS

Introduction

K-Sperse dispersing agents can be used with organic and inorganic pigments in non-aqueous and solvent-free compositions. They are utilized in a broad range of resins including acrylics, alkyds, bitumen, epoxies, polyesters, and polyurethanes. They are particularly effective for carbon black, phthalo blue and iron oxide pigments. Typical advantages include:

Higher pigment loading
Faster dispersion time at lower dispersant levels
Better color development and gloss
Greater transparency of transparent pigments
Improved humidity and corrosion resistance

In addition to the products shown (Table 1), both the calcium and zinc versions are available in PAO (polyalphaolefin) as K-Sperse 131/PAO and 152/PAO, respectively, for use as dispersing and wetting agents for high performance inks.

K-Sperse 2311 is recommended as an aqueous pigment dispersing vehicle. It can be used with a wide range of waterborne resins and pigment types offering:

Improved pigment wetting and reduction in grind time
Higher pigment loading
Excellent color development and gloss
Good mechanical stability and film properties

K-Sperse XD-6501 is a free flowing powder additive offering advantages similar to the liquid products but specifically developed for powder coatings. Additionally, K-Sperse XD-6501 can:

Improve hiding power at lower film thicknesses
Improve dispersion of fillers allowing faster production through the extruder
Withstand the high processing temperatures during extrusion
Be used in rubber and plastic masterbatching                                                                                                      

K-SPERSE Use Levels

(Table 2) lists some common pigments and suggested starting levels of K-Sperse based upon total pigment weight. (Table 3) provides typical grind formulations using K-Sperse 2311.

 

Table 1

Product

 Composition % Active Lbs/Gal Attributes/Features
K-SPERSE
131		 Calcium Sulfonate
Mineral Spirits		 50 7.7 Low optimum use level 0.2 - 7.0% based on total weight of pigment. Particularly effective in air dry alkyds and epoxies.
K-SPERSE
132		 Calcium Sulfonate
2-Butoxyethanol		 50 8.3 Promotes faster dispersion time and better color development particularly for inks.
K-SPERSE
152		 Zinc Sulfonate
2-Butoxyethanol		 50 8.3 Can be used at 1/3 to 1/2 the level of typical commercial dispersants.
K-SPERSE
152/MS		 Zinc Sulfonate
Mineral Spirits		 50 7.9 Especially effective in inks.
K-SPERSE
2311		 Polyester/Urethane
Dispersion in Water		 42 8.8 Excellent for wetting and grinding of organic and inorganic pigments.
K-SPERSE
XD-6501		 Zinc Sulfonate
Precipitated Silica		 55 --- Developed specifically for powder systems.

 

 

Table 2
Typical K-SPERSE Use Levels
On Total Pigment Weight

Pigment Type

 K-SPERSE Level, WT.
Phthalo Blue (red shade) 3.0 - 4.0%
Transparent iron oxide 4.5 - 5.5%
Iron oxides 1.0 - 2.0%
Titanium dioxides 0.5 - 0.7%
Carbon black 3.0 - 35%*
Tint base 0.5 - 0.7%
* Depending on surface area of pigment.

 

 

Table 3
K-SPERSE 2311 Grinding Resin For Aqueous Systems
Typical Grind Formulations

Material

 High Color
Carbon Black		 Phthalo
Blue		 Perylene
Maroon		 Phthalo
Green		 Diarylide
Yellow		 Opaque
Orange		 TiO2
White
K-SPERSEŽ 2311 36.22 48.27 48.27 37.05 36.35 47.64 28.73
Pigment 15.00 21.00 21.00 48.75 39.78 41.66 68.13
Water
DMEA		 45.11
3.67		 30.73 30.73 14.20 23.87 10.70 3.14
TOTAL 100.00 100.00 100.00 100.00 100.00 100.00 100.00
Resin Solid, WT. % 15 21 21 16 15.6 20.5 12.3
Pigment to binder ratio 1/1 1/1 1/1 3/1 2.5/1 2/1 5.5/1

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