Posted on July 5, 2016
Carbon Black Filled Plastic Measurement
Carbon black is one of the most commonly used additives in higher end plastic applications and can be used as a “pigment, conductive filler material, particulate reinforcement, and ultraviolet light (UV) absorber.”1 The purity, soft texture, and intense pigment color of carbon black make it a popular choice in color additive materials, and instrumental analysis helps simplify this process to ensure quality and consistency throughout production. As both a pigment and UV absorber, carbon black is often used as a standard for all other color matching plastic compounds. Spectral technology is able to quantify the color and UV absorbency of this material and attach a numerical value for consistency and repeatability.
Spectral technology is an important tool for color compound producers and is used to establish color specifications to improve quality and consumer satisfaction. Establishing standard test methods with instrumental analysis simplifies the process of dry blending carbon black to achieve a standard base color. Spectrophotometers also offer in-line process monitoring to evaluate specific color changes throughout production in order to create a set of standard based colors that can be repeated from batch to batch and maintain consistency at any facility. Using precise light source specifications and geometric principles, a quantitative matching system can be used to categorize these colors. A color tolerance system can then be applied to develop specific samples for repeatability and customer needs.
Process Monitoring for Consistency and Durability
Color fading and material degradation are common problems associated with outdoor plastic materials. Carbon black filled plastics offer solutions to extend both the color and durability of these products. New spectral technology can reveal how sunlight degradation effects the chemical bonds and molecular chains in polymer materials.2 These studies have allowed manufacturers to closely monitor changes in the light spectrum and assess how variations in polymer formulations can best withstands the affects of nature. These processes help in the development of materials that are both stronger and retain color more effectively.
Carbon black is often used as an internal UV stabilizer in plastic, added before the molding process to help protect the final product from the damaging effects of sunlight. This additive absorbs the UV light and transfers it into heat, which then dissipate throughout the polymer material and reduces the effects of deterioration. The amount of carbon black can alter the final product color outcome, so using instrumental analysis to monitor absorption rates is an effective way to develop the most durable product without compromising color quality. Once a proper balance of UV stabilization and color are obtained, these measurements can then be quantified and stored for repeatability and sample use.
Color Measurement Solutions
Spectrophotometers offer a versatile solution for polymer production and its various applications. Whether you require smaller portable or benchtop models or large production online instrumentation, there are many solutions that have been specifically developed to meet the individual needs of this industry. Spectral technology offers a solution for every stage of production, from large industrial producers to smaller specialized polymer corporations; spectrophotometry is an essential part of plastic production and quality control.
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