Plastic Antioxidant
Plastic Antioxidants
What are plastic antioxidants?
Antioxidants used in plastics are sensitive to oxidative degradation in the process of manufacturing, processing, storage and application of most plastics. Oxygen penetrates into plastic films and can react with most polymers. Causes degradation or cross-linking, which changes the properties of the material. The Plastic Antioxidants are divided into phenols, phosphites and phosphonites, antioxidant mixtures, polyethylene, polypropylene, polyvinyl chloride, polystyrene, acrylonitrile butadiene styrene, etc.
Almost all polymer materials undergo oxidation reactions. Oxidation may occur at every stage of the polymer life cycle, namely during the manufacturing and storage of the material or during processing and final use.
Functions of plastic antioxidants
Antioxidants, also known as plastic additives, are added to plastics to inhibit degradation caused by thermomechanical or thermooxidative conditions. Antioxidants can extend the life of the product, enhance the appearance and maintain its strength, rigidity and flexibility. The way these antioxidants interrupt the degradation process differs depending on their structure. Several amines, phenols, phosphites, thioesters, etc. are used as Plastic Antioxidants.
Main plastic antioxidants:
Plastic antioxidants characteristics:
Plastic antioxidants have been widely used in plastics, among which polyolefin and ABS are the most used, followed by polyoxymethylene, polyvinyl chloride and nylon. In use, two or more antioxidants should be fully utilized together, which can produce the advantages of additive or synergistic effects to obtain better benefits.
1. Additive benefit: When the main antioxidant and the auxiliary antioxidant are used together, their respective characteristics are exerted, and the effect is better than that of using one alone. The use of a high-concentration antioxidant will cause side effects. When several low-concentration antioxidants are used, side effects can be avoided and additive benefits can be exerted.
2. Synergistic response: When the antioxidants are used together properly, and their total efficacy exceeds the sum of their respective efficacy alone, it is regarded as a synergistic effect.
Finally, the oxygen stability of different plastics is different, so some plastics do not need to add antioxidants. Some must add antioxidants. The role of plastic antioxidants is to capture active free radicals and interrupt the chain reaction, in order to delay the oxidation process and speed of plastics. According to the mechanism of action of antioxidants, it is effective for all plastics.
The importance of antioxidant additives in the plastics industry
Antioxidant polymer additives are essential because they help prevent a process called oxidation. By doing so, they can stabilize the quality of plastic products and slow down the degradation process.
But this is not all. Plastics are still susceptible to oxidation after manufacturing. Some plastics are more fragile than others, but oxidation can have a negative impact on the external quality and life cycle of the product. An antioxidant master batch can help curb harmful oxidation processes.
Plastic products most commonly containing antioxidant additives include:
● Various pipes and fittings used in construction and construction industry
● Polyethylene film (PE film) is used in various applications, from construction to food packaging
● Products and films made of polypropylene (PP)
Plastic antioxidants from Forever have good synergistic effect, no color change, no pollution, good volatility resistance, good compatibility with most polymers. Widely used in polyolefin, styrene monomer and copolymer, elastomer, adhesive, engineering plastics (such as: PE, PP, PVC, PS, polyamide, polycarbonate, ABS) and other polymer materials. Other applications include oil, ink, paint, daily chemical and other industries.
How do plastic antioxidants prevent oxidation?
Antioxidants are the most important type of plastic stabilization additives, and almost all polymer resins involve the application of antioxidants. The oxidation of plastics mainly refers to the oxidation of polymers in plastics. Like other polymer materials, the oxidation of polymers is an auto-oxidation process, and the result of the reaction will lead to changes in the polymer structure and damage the material. Antioxidants polymer additives are substances that can trap active free radicals to form inactive free radicals, substances that can decompose polymer hydroperoxides produced during oxidation, substances that stop chain reactions and slow down the oxidation process of polymers. Thus, the polymer can be processed smoothly, improve the oxidation resistance and prolong the service life.
Types of Plastic Antioxidants
There are two main types of antioxidants used in plastics:
Main antioxidants: Known as "chain scission antioxidants", they are free radical scavengers that can remove alkyl radicals generated when polymer chains are destroyed at high temperature and hydroxyl radicals generated by abstract hydrogen; examples include hindered phenols;
Secondary antioxidants: They can remove the organic hydroperoxides formed when the primary antioxidants scavenge free radicals. If it is not removed, the hydroperoxide will cause a new free radical reaction. Examples include phosphites and thioethers;
Usually, a mixture of primary and secondary antioxidants work together to achieve a superior process. In injection molding, phosphite stabilizes the plastic during the melting process, while sulfide is an ideal choice for plastics that are often heated during use.
Transport and storage
Pay attention to waterproof, moisture-proof and sun-proof. Tighten the bag in time before using up the masterbatch. This product is non-dangerous and can be transported and stored as general chemicals.
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