Composition and mechanism of antioxidant masterbatch

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Antioxidant masterbatch, as an important member of modern materials science, plays an irreplaceable role in the field of polymer materials such as plastics and rubber with its unique formula and antioxidant properties. The main ingredients of this innovative product include pigments, antioxidants, dispersing lubricants, carrier resins and possibly fillers, each of which is carefully selected and works together to form an antioxidant masterbatch.
Pigment: As one of the basic components of the antioxidant masterbatch, pigment not only gives the material rich color, but also directly affects the appearance beauty and market appeal of the product. The choice of pigment needs to consider its weather resistance, dispersion and compatibility with the resin to ensure that the color is stable and does not fade during processing and use. The pigment particles are evenly dispersed in the carrier resin to form a stable color system.
Antioxidant: The core of antioxidant masterbatch is the addition of antioxidant. These antioxidants can effectively trap free radicals and interrupt the oxidative chain reaction, thereby slowing or preventing the oxidative degradation of the material. Hindered polyphenols, phosphite esters and thioantioxidants are common of these. The hindered polyphenol antioxidants mainly react with free radicals to form stable free radical intermediates, thus terminating the oxidation process. Phosphite esters can decompose at high temperatures to produce phosphorus free radicals, which bind with the free radicals on the polymer chain to prevent further reactions. Thioantioxidants have a strong ability to trap free radicals because of the presence of sulfur. The mechanisms of action of these antioxidants complement each other to build a strong antioxidant defense.
Dispersion lubricants: In order to ensure the uniform dispersion of solid components such as pigments and antioxidants in the carrier resin, dispersion lubricants are indispensable. They can reduce the surface tension between the components, promote the dispersion and wetting of the particles, and improve the processing performance and product quality of the color antioxidant masterbatch. At the same time, dispersed lubricants can also reduce friction and heat accumulation during processing to a certain extent, protect equipment and extend service life.
Carrier resin: As the backbone of the antioxidant masterbatch, the choice of carrier resin is very important. It not only needs to have good processing properties, such as melting fluidity, thermal stability, etc., but also needs to have good compatibility with pigments, antioxidants and other ingredients. Common carrier resins include polyethylene, polypropylene, ABS and so on. The function of the carrier resin is to combine the components closely together to form a stable antioxidant masterbatch particle, which is convenient for subsequent processing and use.
Fillers: In some antioxidant masterbatch formulations, a certain amount of fillers is also added to reduce cost or improve performance. Fillers can be inorganic substances such as calcium carbonate, talc powder, etc., and can also be organic substances such as wood powder, starch, etc. Their main function is to increase the volume of the masterbatch, reduce the density and cost, and to a certain extent, also improve the hardness, wear resistance and other properties of the material.
In summary, the components of the antioxidant masterbatch cooperate with each other and work together to achieve antioxidant protection for polymer materials. Through scientific and rational formulation design and advanced production technology, antioxidant masterbatches have shown great potential and value in improving product quality and prolonging service life.