Organic Pigments for Printing Ink Industry - China Suppliers and Factory for Vibrant Color Solutions
Product Details
Organic pigments are a class of colored organic compounds that are insoluble in water and the mediums used (such as oils and solvents). They typically exist as highly dispersed microparticles, adhering to the surface of an object or mixed within the object through binders or film-forming substances, thereby coloring the object.
Main Categories and Typical Representatives
Organic pigments are diverse and can be mainly classified into the following categories according to their chemical structure:
The largest category by production volume and variety, accounting for approximately 59% of total organic pigments. Colors are primarily yellow, orange, and red — such as benzidine yellow and permanent orange.
The second largest category, accounting for approximately 24%. Mainly bright and highly stable blues and greens — such as phthalocyanine blue and phthalocyanine green — widely used in high-grade inks and coatings.
Produced by converting water-soluble dyes (such as acid dyes and basic dyes) into insoluble pigments using precipitants. They offer bright colors and low cost — such as golden red and iridescent cyan.
Excellent lightfastness, heat resistance, and migration resistance. Examples include quinacridones (Pigment Violet 19), dioxazines (Permanent Violet RL), and isoindolineones (excellent yellow performance).
Main Application Areas
Organic pigments, due to their vibrant colors, strong tinting strength, and high safety, have a wide range of applications:
The largest application area, accounting for approximately 60% of organic pigments usage.
Used in automotive paints, architectural coatings, and industrial anti-corrosion coatings.
Used for coloring plastic products, synthetic fiber pulp, and rubber tires.
Art pigments (watercolors, oil paints), cosmetics, stationery (crayons, colored pencils), and electronic materials (LCD color filters).
Core Characteristics of Organic Pigments
In addition to the advantages and disadvantages mentioned above, organic pigments also possess some key physical and chemical properties that determine their application performance:
The size of pigment particles (typically in the nanometer to micrometer range) directly affects their color, tinting strength, hiding power, transparency, and weather resistance. Smaller particle size generally results in higher transparency and stronger tinting strength, but may reduce weather resistance.
Smaller particle size leads to a larger specific surface area and stronger surface adsorption, which affects the pigment's dispersibility and rheological properties in the medium.
Organic pigments with the same chemical structure may exist in multiple different crystal forms. Different crystal forms may have drastically different colors, stability, and application properties. For example, phthalocyanine blue has multiple crystal forms (α, β, γ), among which the β crystal form is a stable green-blue color.
To improve dispersibility and stability or to impart special functions (such as easy dispersibility, hydrophobicity), pigment particles are usually surface-treated by adding surfactants, resin coatings, etc. Treated pigments are called easily dispersible or pre-dispersible pigments.
This refers to the pigment's ability to resist the attack of chemicals such as acids, alkalis, oxidants, and reducing agents — crucial for coatings and plastics used in special environments.
In summary, organic pigments are a class of colorants with rich colors, adjustable properties, and good environmental friendliness. In practical applications, it is necessary to comprehensively weigh the advantages and disadvantages based on specific needs — such as required brightness, durability, cost, and processing conditions — and pay close attention to core characteristics such as particle size and crystal form in order to select the most appropriate variety.