Pigment Green 7, also known as phthalocyanine green G, is a synthetic green pigment widely used in various industries due to its excellent properties, including vibrant color, chemical stability, and resistance to fading. Here’s a detailed explanation:
Chemical Structure and Composition
Pigment Green 7 is a derivative of phthalocyanine, a macrocyclic compound that features a planar arrangement of nitrogen and carbon atoms surrounding a central metal ion (usually copper). The green color arises from the addition of chlorine atoms to the phthalocyanine structure.
• Chemical Name: Polychloro copper phthalocyanine
• Chemical Formula: C_{32}H_{3}Cl_{16}CuN_8
• CAS Number: 1328-53-6
This compound is typically produced by chlorinating copper phthalocyanine in a chemical process to achieve the desired green shade.
Physical and Chemical Properties
1. Color: Intense blue-green to bright green.
2. Lightfastness: Excellent resistance to fading under exposure to sunlight.
3. Solubility: Insoluble in water and most solvents, making it ideal for many applications.
4. Heat Resistance: High thermal stability, suitable for high-temperature applications.
5. Chemical Stability: Resistant to acids, alkalis, and oxidation.
Applications
Pigment Green 7 is used in a wide range of applications, including:
1. Paints and Coatings
• Used in automotive paints, industrial coatings, and decorative paints.
• Provides long-lasting and vibrant coloration.
2. Plastics
• Incorporated into polyethylene, polypropylene, and PVC for coloring.
• Maintains stability during processing at high temperatures.
3. Inks
• Commonly used in printing inks for packaging, newspapers, and textiles.
• Offers vivid and consistent printing results.
4. Textiles
• Used in dyeing synthetic fibers.
5. Cosmetics
• Occasionally used as a colorant in non-toxic applications like nail polishes and eye shadows.
6. Other Uses
• Found in ceramics, rubber products, and artist paints.
Environmental and Health Considerations
• Non-Toxicity: Generally considered non-toxic in most applications, but its fine particulate nature can pose a risk if inhaled over long periods.
• Environmental Impact: Being a synthetic pigment, its production and disposal should be managed to minimize environmental contamination. It is relatively inert and does not readily degrade, which can lead to accumulation in the environment.
Standards and Classification
• Color Index Number: CI Pigment Green 7 (CI 74260)
• ISO Standards: Frequently meets international quality standards for pigments in industrial applications.
Pigment Green 7’s excellent combination of durability, intensity, and stability has made it one of the most widely used green pigments globally.
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