Application of Carbon Black 2: Pigment Carbon Black

Author : Clirik

 The pigment carbon black is typically categorized into high-pigment carbon black, medium-pigment carbon black, ordinary pigment carbon black, and low-pigment carbon black based on color intensity (or darkness) and particle size. It is commonly employed as a pigment and filler in industrial production, imparting a vivid black hue to paints, coatings, inks, plastics, etc., while also exhibiting UV resistance as well as acid and alkali resistance properties. In production applications, the even dispersion of carbon black powder within various media enhances its performance properties. For an extended period now, deep black high-end paints have pursued the ultimate combination of intense darkness with a hint of blue undertones; This applies to automotive paints, consumer electronics paints, coil paints, and top-end industrial paints. The fine particles present in carbon black provide exceptional depth of coloration while effectively absorbing ultraviolet light for superior outdoor durability.


About Pigment Carbon Black

carbon black powder 


The carbon black used as a pigment in paints, inks and plastics is referred to as pigment carbon black. Pigment carbon black finds applications in paint,ink,plastic,as well as for conductivity,anti-static properties,ultraviolet light shielding and prevention of resin aging.Therefore,the term "special carbon black" encompasses the broad category of pigment carbon blacks used across various industries.


Characteristics of Pigment Carbon Black

1. In comparison to other pigments, carbon black demonstrates superior coloring power and hiding power, implying that it can achieve a deeper and more intense coloration with reduced pigment quantity required, resulting in cost savings for manufacturers. Moreover, its exceptional hiding power enables effective coverage of underlying layers or imperfections on surfaces.


2. Carbon black distinguishes itself from other pigments due to its outstanding heat resistance, chemical resistance, and light resistance properties. These characteristics make it highly suitable for applications where exposure to extreme temperatures, harsh chemicals, or prolonged sunlight is anticipated. It ensures the longevity and durability of products such as automotive coatings, industrial paints, and outdoor plastics.


3. The unique particle size of carbon black plays a crucial role in its dispersibility within organic resin systems. With particle sizes ranging from just a few nanometers to dozens of nanometers and an impressive porosity level of 90%, ordinary carbon black faces challenges when attempting to disperse stably into these systems without proper modification processes. However, through stringent control measures and specialized modifications during production, pigment carbon black can be successfully dispersed in various mediums such as paint, ink, and plastic systems.


4. Compared to rubber carbon black primarily used in tire manufacturing processes or rubber compound production, pigment carbon black requires additional specialized quality indicators including tinting strength (measuring darkness), coloring power (ability to produce vibrant colors), surface activity (enhancing adhesion properties), electrical conductivity (important for conductive materials), ash content (indicating impurity levels), toluene transmittance (a measure of transparency), dispersion ability (uniform distribution within a medium), and fluidity (ease of handling). Meeting these specific quality standards ensures the desired performance characteristics for pigment carbon black.


Application of Pigment Carbon Black



Pigment carbon black is widely acknowledged for its indispensable role in the sealant industry, particularly in automotive sealants. In addition to its primary function of dyeing, pigment carbon black offers numerous additional benefits that significantly enhance the performance and longevity of sealants. 


One notable advantage of incorporating pigment carbon black into automotive sealants is its ability to effectively absorb ultraviolet (UV) light. By acting as a protective shield against harmful radiation, it prevents damage caused by prolonged exposure to sunlight. This anti-ultraviolet effect not only preserves the aesthetic appeal of vehicles but also helps maintain their structural integrity over time.Furthermore, pigment carbon black exhibits exceptional resistance to acid, alkali, and corrosion. When integrated into sealant formulations, it provides robust protection against chemical degradation caused by acidic or alkaline substances commonly encountered in various industrial environments. This resistance ensures that sealed surfaces remain intact and unaffected even when exposed to harsh conditions or corrosive agents.


The versatility of pigment carbon black extends beyond just automotive applications; it finds utility across diverse sectors within the broader sealant industry as well. Whether used in construction materials like silicone-based adhesives or industrial-grade caulks, this additive provides similar advantages such as UV protection and enhanced durability against chemical attacks.


 plastic coloring 

Plastic Coloring

The selection of pigment carbon black for coloring plastics is generally based on its coloring characteristics, physical and chemical properties. The choice of carbon black variety mainly depends on achieving the desired level of blackness in the finished product. Fine pigment carbon black is particularly suitable for achieving high levels of blackness in coloring applications, while medium levels of blackness can be achieved with low specific surface area and high structure carbon blacks, which are commonly used in PE garbage bags, plastic bags, cable materials, and other products. When it comes to plastic coloration, using a larger particle size and lower coloring power pigment carbon black is recommended to minimize weighing errors that may result in noticeable color differences.


Additionally, this type of carbon black offers better dispersion properties at a lower price point. For gray plastics, fine pigment carbon blacks tend to produce brownish-gray shades while coarse particle pigments can yield bluish-gray tones. Carbon black exhibits superior properties compared to other organic pigments except for its challenging dispersibility; however, when used in appropriate amounts it provides enhanced antistatic or electrical conductivity effects. Although essentially non-toxic, due to its tendency to become airborne and cause pollution concerns, carbon black is often utilized in the form of color masterbatches within the plastic industry as this improves both dispersion capabilities and eliminates potential contamination issues.



Uv Protection

One application of carbon black in the plastics industry is to provide protection against ultraviolet aging. This is because of its high light absorption capacity, which effectively shields plastics from sunlight and prevents photooxidation degradation. The role of carbon black as a UV stabilizer in plastics includes converting light energy into heat energy, safeguarding the plastic surface from specific radiation wavelengths, and intercepting atomic groups to produce an anti-aging effect that prevents catalytic degradation.


Ultraviolet light poses significant harm to polyolefins, and tests have demonstrated that optimal UV shielding can be achieved with a concentration of 2% carbon black at a certain fineness level. The protective effect of carbon black on ultraviolet aging depends on its particle size, structure, and surface chemistry. Smaller particle sizes result in increased light absorption or shading ability, thereby enhancing the UV protection effect. However, when the particle size falls below 20nm, the protective effect tends to plateau because excessively small particles reduce backscattering while allowing forward-moving light to potentially destabilize polymers.


Carbon black with lower structure (i.e., smaller aggregate size) enhances polymer protection and contributes to its characteristic black coloration. Additionally, higher levels of oxygen-containing groups on the surface of carbon black facilitate elimination of generated byproducts during polymer decomposition when volatile content is high; this further strengthens its protective effect.


Carbon Black Grinding Mill

ultrafine grinding mill 

HGM Ultrafine Grinding Mill

Capacity: 0.2-45 t/h

Feed Size: ≤20 mm

Powder Fineness: 325-3000 mesh


The ultrafine mill is primarily suitable for processing medium and low hardness ultrafine powder, including non-flammable and explosive brittle materials with a Mohs hardness of ≤6. Additionally, it is capable of processing carbon black as well as more than 100 other materials such as calcite, chalk, limestone, dolomite, kaolin, bentonite, talc, mica, magnesite, illite phyllite vermiculite sepiolite attapulgite rectorite diatomaceous earth barium sulfate gypsum alum graphite fluorite phosphate rock potassium ore pumice stone etc. The particle size of the finished fine powder can be adjusted between 325-3000 mesh (44-5 microns).


Mill Advantages

1. With a large crushing ratio and high energy utilization rate, it is capable of processing D97≤10μm powder in one go, with the -3 μm fine powder accounting for approximately 40% and possessing a significant specific surface area. The high-speed impact mill offers advantages such as high efficiency, low consumption, and fineness comparable to air grinding.


2. Equipped with a forced turbine classification system, it ensures uniform particle size distribution and enables easy adjustment of the finished product's fineness between 5-38μm according to market demand. This enhances enterprise competitiveness by offering different levels of fineness products.


3. Featuring a comprehensive pulse dust collection system that utilizes pulse jet cleaning method, each filter bag is cleaned individually using compressed air to prevent long-term accumulation of powder leading to blockage. This results in a dust collection efficiency exceeding 99.9%, effectively ensuring a dust-free operation within the workshop.


4. Designed with durability in mind, this equipment exhibits minimal wear and shock due to its use of special wear-resistant steel for the grinding roller and ring components. Additionally, the main machine base adopts an integral casting structure which not only guarantees structural strength but also provides excellent anti-shock performance.

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