HITOX®  TiO2 Pigment Adding Value To Color Formulations

HITOX® for colorIntroduction

A natural colored beige TiO2 pigment, called HITOX® add value to many formulations by replacing some of the more expensive colourants.

HITOX® colored pigment has a TiO2 content of about 95% and can be used as partial or full replacement for white TiO2. In products which require opacity and color, the cost savings is achieved from the reduction of more expensive TiO2 and colorants, such as phthalo blues and greens.

The main differences between white TiO2 and the natural-colored pigment are particle size, oil absorption and iron oxide (Fe2O3) content.

Particle Size

The absence of a surface treatment combined with the pigment's larger particle size and slightly higher oil absorption require that extra care be taken to ensure that the pigment is properly wetted and dispersed into the vehicle system.

Iron Oxide Content

HITOX® TiO2 pigment contains between 1.5% and 2.0% residual Fe2O3, which partially gives the pigment its natural beige color. The natural beige color is inherent in the pigment's crystal structure.

Performance

HITOX® TiO2 meets ASTM D-476-84 ( Standard Specification for Titanium Dioxide Pigments) Type II and Type III as a chalk-resistant, rutile pigment.

Exterior-exposure and accelerated-weathering studies have shown that natural-colored TiO2 used as a color pigment in conjunction with other color pigments performs similarly to treated white TiO2 on chalking and color shifts.

Substantial improvements over the past several years in color quality, lot-to-lot color consistency, and a uniform particle size over a narrow range have allowed the pigment to be used in most coating systems.

Fig. 1 : Comparison of the Typical Properties of HITOX® STD, HITOX® ULX

Property HITOX® STD HITOX® ULX WHITE TiO2
Color Beige Lighter Beige White
Crystal Structure Rutile Rutile Rutile
TiO2 Content 95% 95% 94%
Refractive Index 2.73% 2.73% 2.73
Fe2O3 1.7% 1.7% N/A
Al2O3 0.4% 0.4% 2.0%-4.5%
SiO2 1.25% 1.25% 0%-3.0%
Median Particle Size, microns 1.5 0.75% 0.2-0.3
Specific Gravity 4.1 4.1 4.1
Oil Absorption, ASTM D-281 23-28 26-28 13-20
Moisture <0.5% <0.5% 0.5%-1.0%
325 Mesh Retention <0.01% <0.01% 0.01%
Hegman Grind 7.0 7.0 7.0
pH 6.5-7.5 6.5-7.5 6.5- 8.5 

Color Properties

HITOX®  TiO2 is used as a partial or full replacement for white TiO2, but the advantage of  formulating  with HITOX® TiO2 pigment is its color properties and thereby reduce the amount of the more costly color pigments.

In Figure 2, the color value of HITOX® colored TiO2 is demonstrated by the reflectance properties over the visible range of the spectrum as compared to a white TiO2. The HITOX® colored pigment's ability to absorb the light in the visible spectrum differentiates it from a white TiO2 and places it in a color-pigment category. The tinting color pigments used in a formulation with white TiO2 are thereby reduced when HITOX® is inserted as a color pigment.

Paint Formulation

A blue industrial alkyd gloss enamel coating with and without HITOX® comparison is as shown. The paint prepared with HITOX® TiO2 resulted in a reduction in the amount of Hansa Yellow, Phthalo Blue, and Carbazole Violet color pigments used to obtain the desired color. The white TiO2 loading was reduced from about 3.7 kilos to about 2.0 kilos.

The Color difference between the two blue enamel is 0.23 DE*. Significant cost savings are achieved by using the HITOX® TiO2 pigment as a partial replacement for white TiO2, but more so by reducing the amount of the more expensive color pigments, This savings is obtained by taking advantage of the color properties of the HITOX® TiO2.

Blue Industrial Alkyd Gloss Enamel

Without HITOX® With HITOX®
Grind Paste Components Kilos Litres Kilos Litres
LO Alkyd 10.3 12.9 10.3 12.9
MO Alkyd 14.6 19.3 14.6 19.3
Dispersing Agent 0.3 0.4 0.3 0.4
Thickener 0.3 0.2 0.3 0.2
 
Pigment Components
Hansa Yellow 74 0.12 0.10 0.06 0.05
Phthalo Blue 15:4 1.44 1.04 1.07 0.77
Carbazole Violet 23 0.54 0.37 0.39 0.27
HITOX® TiO2 0.00 0.00 2.35 0.69
White TiO2 3.72 1.12 1.96 0.59
CaCO3 15.42 6.84 15.49 6.87
Total Pigment 21.24 9.47 21.32 9.24
         
Mineral Spirits 4.0  6.2 4.0 6.2
 
Letdown Components
MO Alkyd 29.4 38.8 29.7 39.0
Solvent 1.5 2.1 1.5 2.1
Mineral Spirits 6.5 9.9 6.5 10.0
12% Cobalt Drier 0.1 0.1 0.1 0.1
9% Manganese Drier 0.2 0.2 0.2 0.2
18% Zirconium Drier 0.3 0.4 0.3 0.4
Anti-Skin Agent 0.1 0.1 0.1 0.1

Total of Finished Paint :

88.94 10.07 89.22 100.14
Physical Properties
Finished Paint kg / Litre : 0.89 0.89
% Solids by Volume : 48.4 49.4%
Gloss 60 : 76.4 81.0
Relative Cost Saving : Reference 24.70%

Color Differences : "WIth HITOX® TiO2" Versus "Without" 
DL* = 0.09  Da* = 0.20  Db* = -0.06  DE* = 0.23

Relative % Cost Savings in Total Pigment Cost

Some examples of Industrial Gloss Coating Using HITOX®

 

 

 

(% cost saving)

 


 

Blue
26%

 


 

Green
29%

 


 

Ivory
13%

 


 

Orange
21%

 


 

Grey
31%

Application for HITOX®

  • Coating applications in which HITOX® STD is used widely and successfully are architectural paints, traffic markeing paints, automotive and maintenance primers, and coatings for appliances and office furniture. Coating systems that may incorporate HITOX® include alkyds, acrylic urethanes, high solids systems, water reducibles, water bases, powder coatings, and others.
     

  • HITOX® is also used on adhesives, paper, roofing products and other building materials.
     

  • Plastics uses include all colors of PVC pipe and conduit, vinyl siding, floor tiles, color concentrates, plastic film and master batches.
     

  • HITOX® ULX being the finer particle size pigment is preferred in applications such as high performance coating, high gloss paints and thin film plastics.


HITOX® Beige Color in Combination with White TiO2

 
 


 

 


 

 


 

 


 

 


 

HITOX® 0% 25% 50% 75% 100%
White TiO2 100% 75% 50% 25% 0%

 


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