7 application characteristics of rubber and plastic antioxidants
发布：2024/5/15 9:17:02
Antioxidants are one of the commonly used antioxidants in plastic materials, which can be used to prevent raw material embrittlement and significantly increase the service life. However, due to the different chemical structures of different plastics, the different production, processing, forming, and processing temperatures, as well as the different safety factor regulations for the resulting products, all of these limitations pose a threat to the use of the product. So, when using this product, it should have the following types of application characteristics.
1. Color pollution
At present, the key antioxidants widely used in the field of plastic applications are acrylamide and hindered phenolic compound antioxidants. Among them, acrylamide antioxidants are mainly used in gray black rubber products, while hindered phenolic antioxidants are widely used in light gray adhesive products because they cause less color pollution. In fact, hindered phenolic antioxidants can also cause color stains, which are mainly manifested as yellowing or redness, usually caused by the oxidizing substances of hindered phenolic antioxidants. By selecting appropriate phenolic compound antioxidants and other service antioxidants, color pollution can be prevented or reduced.
2. High temperature reliability
The production, processing, and natural environment application temperatures of different plastics are different. At this time, high-quality high temperature resistance and reliability become the key indicators of antioxidants used in plastics. Antioxidants have good high temperature resistance and reliability, which can avoid the color change of plastics or the decrease in antioxidant efficiency caused by decomposition reactions. Especially for plastics that require higher forming temperatures, the heat resistance requirements for antioxidants are increasing.
3. Migration resistance and solubility
The transfer resistance of antioxidants is closely related to their compatibility with plastics, and compatibility largely depends on the binding size between antioxidants and plastics, such as similarity in optical rotation and solubility parameters. If the solubility between antioxidants and plastics is poor, antioxidants are easily transferred from the plastic, resulting in a white top condition. Because the function of antioxidants is to provide overall protection for plastics, excessive transfer not only produces whitening, but also reduces the aging resistance of plastics in the middle and later stages, especially for plastics that require long-term heat and oxygen embrittlement properties. In addition, high crystalline plastics are more prone to the transfer of antioxidants and other antioxidants.
4. Competitiveness with other components
When antioxidants are added to plastic, people do not expect them to "clash" with other components in the plastic, that is, to produce resistance effects. What they expect to achieve is a stronger+stronger=stronger, that is, a synergistic effect. For high-density polyethylene cables with peroxides, there is a resistance effect between peroxide crosslinking agents and antioxidants. Improper types and amounts of antioxidants can ultimately harm the quality of cable materials. For example, in the chemical crosslinking of vulcanized rubber, inappropriate antioxidants will significantly slow down the chemical crosslinking or dry setting of vulcanized rubber, and even endanger its crosslinking density.
5. Permeability
Only by achieving uniform dispersion of antioxidants in plastics can the overall aging resistance of plastics be ensured, especially for thin products. The lack of antioxidants in some areas of thin products can become a weak link in all products, and they will be destroyed first, causing all products to become ineffective in advance, in order to ensure quality and quantity. The industry generally carries out the addition of antioxidants according to the regeneration method to ensure that antioxidants are dispersed and evenly distributed in thin products as much as possible.
6. Health and safety
Some antioxidants can have adverse effects on human physical and mental health, such as bisphenol A. Different countries require different limit values for the allowable addition of antioxidants. Especially in food packaging materials, antioxidants should be avoided as much as possible, and they must be added as much as possible. If considering their production and processing regulations, it is acceptable. In addition, the quality of antioxidants from different manufacturers also varies, such as insufficient purity and heavy metal pollution.
7. High cost performance ratio
Cost is the first factor that most companies consider, especially in the plastic modification manufacturing industry where profits are low. This also results in some high-quality antioxidant types being unable to show their strength due to their high prices. However, it must be noted that antioxidant customers do not just need to focus on price alone. Depending on the combination and application of antioxidants with different advantages, these more expensive types of antioxidants still have great potential. The final thing people need to look at is the comprehensive cost. In the future plastic manufacturing industry, the quality standards for products will always be higher, and good types of antioxidants will eventually win the hearts of customers. Therefore, does the regulations on the use of antioxidants in plastics analyzed above provide some assistance when you purchase this product? Naturally, when purchasing a product, in addition to mastering its various applications, it is also important to have a thorough understanding of its efficacy and how to distinguish its quality.
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