Introduction to antioxidants
Antioxidants are chemicals used to delay or inhibit the oxidation process of polymers. They can extend the service life of polymers and are also called “anti-aging agents.” Broadly speaking, most weak reducing agents are antioxidants, which are classified into those with higher chemical and physical stability, or those with low toxicity.
Thermal oxidation process of organic compounds is a series of free radical chain reactions, which leads to fundamental changes in the structure and properties of organic compounds. The mechanism of action of antioxidants is essentially to eliminate newly generated free radicals. According to different modes of action, they can be divided into primary antioxidants (eliminating free radicals) and auxiliary antioxidants (decomposing hydroperoxides)
The quality of an antioxidant can be judged from the following aspects:
①Has high antioxidant capacity;
②Good compatibility with resin and no precipitation;
③Good processing performance, no volatilization or decomposition at the processing temperature of the polymer;
④Good extraction resistance, insoluble in water and oil;
⑤The color itself is preferably colorless or light-colored so as not to contaminate the product;
⑥Non-toxic or low-toxic;
⑦The price is low.
But in fact, no antioxidant can fully meet these conditions. Therefore, in practical applications, it is necessary to give full play to the strengths of various additives and use them together according to the type, use and processing method of the polymer to produce a synergistic effect.
Product recommendations
After learning so much about antioxidants, the editor has also collected several popular and high-quality antioxidant products for you to take a look at. Bar.
BasfBASF antioxidant Irganox 1010
Properties: Known as the benchmark product in the plastic additive industry, it is a hindered phenolic primary antioxidant widely used in the polyolefin industry.
Features: high extraction resistance, low volatility and good compatibility. It is colorless and odorless under normal conditions. Care must be taken to prevent moisture and dust contamination during storage.
Application: Mainly used in polyolefins, such as polyethylene, polypropylene, polybutylene and olefin copolymers (such as ethylene-vinyl acetate). It can also be used in the processing of polymers, such as polyacetal, polyamide, polyurethane, polyester, polyvinyl chloride, crystalline polystyrene, high-strength polystyrene, ABS, and elastomers.
In terms of application fields, it is widely used in general plastics, engineering plastics, synthetic rubber, fibers, hot melt adhesives, resins, oils, inks, coatings and other industries. , which can effectively protect such materials from thermal oxidative degradation.
BasfBASF antioxidant Irganox 1076
Properties: It is a highly efficient colorless hindered phenolic antioxidant that has good compatibility with most polymers. Capacity.
Features: It has low volatility, good extraction resistance and photostability, and can effectively reduce discoloration caused by light and heat. reaction. Its chemical properties are relatively stable, easily soluble in benzene, ester and other solvents, slightly soluble in ethanol, and insoluble in water.
Application: Mainly used as an antioxidant for synthetic resins and can be used in plastics, synthetic fibers, elastomers, adhesives, waxes, oils and Fats protect these materials from thermo-oxidative degradation.
Easy chemical antioxidant JYANOX-168
Properties:The Chinese name is phosphite triester, which is an auxiliary antioxidant that is resistant to water extraction, has low volatility and high thermal stability. oxidizing agent.
Features: Easily soluble in benzene, chloroform, cyclohexane and other organic solvents, insoluble in water, alcohol and other polar solvents but soluble in in esters. It has low toxicity, good thermal stability and excellent hydrolysis resistance.
The most unique thing about it is that even if the product is soaked in hot water at about 90℃ for 14 hours, the product can still be fully recycled and the quality will not be affected. .
Application: Can effectively decompose polymersHydroperoxide is produced during the thermal processing of materials, but is generally not used alone. Instead, it is often used in combination with phenolic main antioxidants such as antioxidants JY-1010 and JY-1076 to improve the thermal processing of polymeric materials. stability in.
There are more than a dozen formulations of the highly chemical antioxidant JYANOX-168 compounded with phenolic antioxidants, which are widely used in polyolefins (such as polyethylene , polypropylene), polyamide, polycarbonate, ABS resin and other polymer materials are generally used for chemicals, not as food additives.
Extremely easy chemical antioxidant JYANOX-626
Properties: The chemical name is dipentaerythritol diphosphite, which is a high-performance solid organic phosphite antioxidant.
Features: It can play a good protective role in the color of the polymer, which is a major feature that it is superior to other phosphites. In its normal state, it is in the form of white crystalline powder or granules, but due to its poor resistance to hydrolysis, care should be taken to prevent moisture and heat during storage.
Application: Generally not used alone, mainly used in combination with phenolic main antioxidants such as antioxidant 1010, which can effectively improve polymer processing Thermal stability of the process. After compounded with phenolic antioxidants, it can be widely used in polymer materials such as PE, PP, PS, polyamide, polycarbonate, and ABS.
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