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    Features

    Four Steps to Effective Pigment Dispersions

    Starting from Scratch.

    Four Steps to Effective Pigment Dispersions
    Figure 1. Solubility of PY 74 in different solvents.
    Four Steps to Effective Pigment Dispersions
    Figure 2. Pigment selection criteria.
    Four Steps to Effective Pigment Dispersions
    Figure 3. Steps for a stable pigment dispersion.
    Four Steps to Effective Pigment Dispersions
    Figure 4. High shear Cowles blade.
    Four Steps to Effective Pigment Dispersions
    Figure 5. Selecting the amount of surfactant.
    Four Steps to Effective Pigment Dispersions
    Figure 6. Dispersibility study.
    Four Steps to Effective Pigment Dispersions
    Four Steps to Effective Pigment Dispersions
    Four Steps to Effective Pigment Dispersions
    Table 1. Wetting and dispersing agents – chemical types.
    Four Steps to Effective Pigment Dispersions
    Four Steps to Effective Pigment Dispersions
    Table 3. Physical properties for various CI pigments.
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    Jadel Baptista, Technical Director, LANSCO COLORS08.09.17
    Introduction
    Pigments are designed and produced to be insoluble particles used to impart color in a variety of materials.  They can be classified as organic, inorganic, effect, and functional. The diverse range of pigment chemistries, the end use requirements, and the broad range of colors available create a challenge for chemists in selecting the optimal pigment or additive for a given application.  Proper pigment and additive selection is critical in determining the performance of the finished coating as well as the production efficiency. Understanding the various pigment types, properties and chemical families will help the formulator in determining the most effective pigment chemistry and manufacturing processing, thus avoiding potential problems with the final coating and application. This paper focuses on pigment families and their application in waterborne, solventborne and universal dispersions.  The theory behind processing, selection of wetting and dispersing agents, and the differences between co-grinding and single pigment dispersion are discussed.

    Pigments vs. Dyes – Is Solubility Important?

    Pigments are inorganic or organic colorants that are virtually insoluble in the application medium while dyes are colorants that are soluble in the application medium. Understanding this difference is the most important concept to help with the correct colorant choice. Dyes are organic molecules with brighter undertone, higher transparency, and they generally demonstrate inferior fastness to UV exposure versus pigments. Organic pigments vary regarding their chemical structure and surface treatment; some can behave like a dye, losing their crystal structure when exposed to solubilizing conditions. This structural change will negatively impact the pigments fastness properties. A good example of this is Pigment Yellow 74, widely used in architectural paints. This pigment will have better fastness properties when used in the mentioned application, than in most industrial paint applications. The difference in performance is due to the solvents used in these systems. Solvent-based architectural paints, are based on acrylic and/or medium/long oil alkyd resins, and the preferred solvent used in this application is mineral spirits. In waterborne applications, acrylic emulsions or water-soluble acrylics are used. Pigment Yellow 74 is slightly soluble in mineral spirits but is not soluble in water (Figure 1), therefore it will maintain its crystal structure. However, in industrial coatings applications, where the most commonly used solvents are aromatics, esters and ketones, Yellow 74 will have higher solubility which will have a negative influence on its fastness properties such as heat stability, weathering, overspray migration, and opacity.  Choosing the correct pigment for the desired application should be the first step during the coatings formulation process in order to formulate a stable system. Formulators are advised to consult their pigment suppliers in order to obtain the appropriate pigment solubility information.

    In addition to solubility, resistance to acids and alkalis, heat stability and weatherfastness/lightfastness, should be considered in order to formulate a stable system that meets end use requirements.

    Figure 2 shows some important points to be considered during the initial formulating stage. The formulator should always keep in mind that the same pigment chemistry may not perform equally in all coatings systems.

    Organics vs. Inorganics – Are they different?

    Organic pigments are synthetic materials based on carbon usually derived from petrochemicals. They generally are not stable at elevated temperatures and have partial solubility in strong solvents, but do not dissolve in water.  Inorganic pigments are metal salts and oxides, some natural and some synthetic, that generally are stable at elevated temperatures and do not dissolve in solvents. Due to their stable chemical structures, most inorganic pigments have better weatherability, dispersibility and opacity than organic pigments, however they will typically have lower chromaticity and tinctorial strength.

    Pigment Impurities

    Pigments with the same color index identification produced by different manufacturers or different manufacturing processes could potentially have different performance in spite of being coloristically similar.  This is due to impurities which can be the result of unreacted raw materials, by-products, inorganic salts, and contaminants in the water. These impurities may cause adverse effects on weatherfastness, dispersion stability, and solvent fastness.

    In order to provide assurance that pigments do not have excessive impurities, the pigment manufacturer should test for pH, conductivity, oil absorption, and viscosity in specific testing systems.  They may even consider doing additional viscosity stability and dispersibility testing for certain pigments as needed.  In addition to approving a pigment for color, coatings formulators should always verify the stability of the final coating in determining the proper pigment or pigments for a given system or application.

    Factors Affecting Color Development

    Pigment color development is dependent on five variables: dispersibility, energy input, process dwell time, system components, and pigment interactions.  Paying proper attention to these variables will provide the highest probability of developing a stable formula.

    Dispersibility

    Pigments must be properly wetted, de-agglomerated/dispersed and uniformly distributed and stabilized (Figure 3) in order to achieve maximum color intensity, gloss, and hiding power. Stabilization of a pigment dispersion requires time and energy. Dispersed pigments have a strong tendency to return to their initial agglomerated state. Due to this strong tendency, proper selection of wetting and dispersing agents is critical in obtaining a stable formula. Surfactants or wetting additives are normally defined as amphiphilic chemistries with low molecular weight while dispersing additives are oligomers able to stabilize the pigments and avoid re-agglomeration. The different types of wetting and dispersing agents are described in Table 1.

    Wetting

    To properly wet a pigment, the air/solid interface needs to be replaced by a liquid/solid one.  Therefore, the less air entrapped in the system, the more effective the wetting will be. It’s all about surface tension! For a liquid to wet a solid, its surface tension must be lower than the free surface energy of the solid. Therefore, liquids with low surface tension are more effective at wetting and this is why wetting additives are so valuable to the formulator. They will reduce the surface tension and will adhere to the surface and coat the pigment to create an additive/liquid interface. Generally, solvent-based systems more readily wet a pigment due to the lower surface tension of solvents when compared to the higher surface tension of water (Table 2).

    Deagglomeration

    In this phase of the dispersion process, pigment agglomerates are separated into smaller aggregates and primary particles. The lower the surface tension of the vehicle in which the pigment is being incorporated, the lower the energy that will be needed to disperse the pigment. Deagglomeration is achieved through the use of mechanical energy developed by the use of high-speed dispersers and various types of grinding equipment. A Cowles blade fitted on the shaft of a high-speed mixer can be an efficient means of dispersing a pigment. High Shear blades  are a highly recommended type of Cowles blade (Figure 4) which is well suited for pigment dispersion. Other types of blades include a High Vane blade or a Combination blade which also can be used depending on the viscosity of the dispersion and the need to move/blend the raw materials during processing.

    In order to ensure a good laminar flow and increase the efficiency of dispersion it is recommended that the blade diameter is approximately 1/3 of the tank diameter, and also that the blade is approximately 0.5 to 1.0 diameters off the bottom of the tank. The recommended tip speed for a system with viscosity between 70-100 Krebs units is between 4,000 – 6,000 fpm. The following equation can be used to determine the tip speed: Shaft RPM x 0.262 x blade diameter (inches). Pigments with a harder texture can be more finely dispersed by using a media mill, which produces significantly more shear, such as horizontal, vertical and basket mills.  In order to disperse the pigment to a nano level, the use of 0.3-0.5 nm grinding media is recommended.

    Stabilization

    Due to the increased surface area of the solid particles during the deagglomeration/grinding stage, the pigments that are deagglomerated need to be stabilized in order to avoid issues such as flocculation, color shift, sedimentation and stability loss. The stabilization process takes place by incorporating dispersion additives which achieve stabilization through the following mechanisms.

    Electrostatic Stabilization

    Used in water-based systems and mostly with inorganic pigments, additive molecules adhere to the pigment surface, through ionic bonding, hydrogen bonds, and/or dipole interaction and cause the particles to repel each other through electrostatic forces. Pigments with high conductivity may not be stabilized through electrostatic stabilization. Zeta potential (the potential difference existing between the surface of a solid particle immersed in a conducting liquid, e.g., water, and the bulk of the liquid), serves as a reference as to how stable the formula will be.  Pigment dispersions with a potential between +30 mV and -30 mV have a high probability of being unstable. The pH, once the pigment has been incorporated into the formula, can be a good indicator of stability; dispersions with pH values between 4 and 7.5 are more prone to have dispersibility/stability issues, indicated by the Zeta potential value as it will most likely be between +30 and -30 mV. The addition of a pH modifier can be necessary in some cases.

    Formulas where the dispersion must be acidic due to the final application having a pH lower than 4 is recommended, and for alkaline dispersions a pH higher than 7.5 is good. The closer to zero the Zeta Potential is, the more prone re-agglomeration will be with WB dispersions. Electrostatic stabilization is accomplished by dispersion agents with cationic or anionic molecular groups, e.g., quaternary ammonia salts and alkylpolyamines (cationic) or polycarboxylic acids and sulfonated organic substances (anionic).

    Steric Stabilization

    Used in both water- and solvent-based systems, the additive anchoring groups will adhere to the pigment surface. The compatibility of the system is dependent on the functional segments of the polymer that compose the hydrophobic portion. Regarding steric stabilization, the additive will physically reduce the mobility of the pigment particles and therefore avoid/minimize flocculation or re-agglomeration. This type of stabilization is accomplished mainly with nonionic dispersing agents.

    Amount of Surfactant Selection

    Too much or too little of a surfactant can be detrimental to the stability of a pigment dispersion. The determination of the optimal level is based on the rule of 2-2.5 mg of polymeric dispersant needed per square meter of pigment surface (Figure 5). This rule must be applied initially, after which the formulator is advised to do a ladder study to determine the optimal level based on viscosity changes, the occurrence of flooding and floating, oven stability and freeze-thaw stability evaluations when necessary.

    Dispersing Agent Selection

    The recommended type of dispersant adhesion group depends on the pigment surface. The following suggestions may help formulators select the most effective dispersant chemistry for the pigment being evaluated.

    • Organic pigments (aromatic surface treatment) - Dispersants containing phenyl or naphthyl groups are recommended.

    • Inorganic pigments (oxides, sulfides, silicates, etc.) - Dispersants containing acidic groups, i.e, phosphate, carboxy, or sulfate are recommended.

    • Carbon blacks (diazonium surface treatment) - Dispersants containing nitrogen.

    Pigment Dispersibility – Co-Grinding vs. Single Pigment Dispersion

    Pigment chemistries vary in texture and the amount of energy required to achieve full color development will differ from one to another.  A good way to determine the pigment’s optimal dispersion time is by doing a dispersibility study in which the formulator will determine the time and energy needed to develop the pigment to its full strength by evaluating its coloristic properties. Figure 6 shows the dispersibility of selected PB 15:2, PG 7, PY 74 and PY 65 pigments. These pigments were evaluated for strength and color in 30 minute intervals, where the dispersion made with 15 minutes of grind time was used as the standard. Pigments were ground beyond their optimal level which can be confirmed when a loss of color strength is observed. This type of evaluation is important in determining the optimal processing time for a pigment in a selected formulation.  As can be seen in Figure 6, some pigments develop their strength and color faster than others. This is a key factor to consider when co-grinding pigments as it may not be possible to achieve optimum color development and consistency by this means.  It is for this reason that single pigment dispersions are recommended as the best means of obtaining the full color development value of a given pigment.

    Additionally, not all pigments have the same behavior in a specific coatings formula due to variations in their physical (i.e., surface area, oil absorption, particle size) and chemical properties (i.e., chemical structure, surface treatment) as shown in Table 3. It should be noted that there is no direct correlation between the physical properties of various color indexes and this provides additional reasoning as to why co-dispersion of pigments is not recommended.

    Conclusion

    Pigments are a key component in a coating formulation and proper selection and dispersion is critical in determining the performance of the coating. In a recent study regarding the requests for technical assistance received over the past 2 years, it was noted that nearly 80% of the formulation issues were resolved by modifying or changing the pigments being used in the formula.  It is a mistake to assume that all pigments will perform the same from one formula to another. This assumption could also prove to be costly with respect to the coating development and manufacturing process. The keys to achieving a stable coating with the optimum performance and value are: proper pigment selection, proper additive selection, and the appropriate means to achieve complete dispersion.  It is for this reason that we strongly suggest that formulators consult with their raw material and equipment suppliers to better understand their options and potential issues when formulating a coating. 

    References

    1. BASF, little helpers love great achievement - Practical Guide to Dispersing Agents, 2016
    2. Hunger, Klaus, Thomas Heber, Martin U. Schmidt, Friedrich Reisinger, and Stefan Wannemacher. Industrial Organic Pigments Production, Properties, Applications.Weinheim, Bergstr; Wiley-VHC, 2013. Print.
    3. Surface Coatings. London: Chapman & Hall, 1993. Print.
    4. “Surface Tension Values of some Common Test Liquids for Surface Energy Analysis”. N.p.,n.d. Web 29 June 2017

    Acknowledgements

    The author would like to acknowledge Frank Lavieri, Mark Freshwater, Ralph Svenningsen, and Belinda DeSousa from LANSCO COLORS for their contributions.
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