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[Chemical Knowledge]：Properties and uses of hindered classified antioxidants

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The nature and use
of hindered classification antioxidants in the field of raw materials for chemical production
Abstract:

This paper introduces in detail the nature and use of hindered classification antioxidants in the field of raw materials for chemical production. Hindered phenolic antioxidants are an important class of antioxidants. Due to their unique chemical structure and excellent antioxidant properties, they are widely used in plastics, rubber, oils and fats, food and other fields. This paper will focus on the properties, synthesis methods, mechanism of action and specific applications of hindered phenolic antioxidants in various fields.

1. Introduction

Hindered phenolic antioxidants are a class of organic compounds with a special structure, which contain hindered phenolic hydroxyl groups in the molecule. Due to its unique chemical structure, hindered phenolic antioxidants exhibit excellent antioxidant properties and can effectively delay the aging process of polymer materials. Therefore, they have a wide range of applications in the field of chemical production raw materials.

2. The properties of hindered phenolic antioxidants

1. Chemical structure: The phenolic hydroxyl group in the molecule of hindered phenolic antioxidants is blocked by large substituents, making the phenolic hydroxyl group less susceptible to attack.
2. Thermal stability: Hindered phenolic antioxidants have high thermal stability and can maintain good oxidation resistance at high temperatures.
3. Oxidation resistance: Hindered phenolic antioxidants have excellent oxidation resistance and can effectively inhibit the aging process of polymer materials.

3. Hindered phenolic antioxidant synthesis method

hindered phenolic antioxidant can be synthesized by a variety of methods, such as alkylation reaction, esterification reaction, condensation reaction. Among them, the alkylation reaction is one of the commonly used synthetic methods, which generates hindered phenolic antioxidants by nucleophilic substitution reaction between phenol and halogenated hydrocarbon under the action of alkaline catalyst.

4. the mechanism of action of hindered phenolic antioxidants

The mechanism of action of hindered phenolic antioxidants is mainly by capturing free radicals in polymer materials, blocking free radical chain reactions, thereby inhibiting the aging process of materials. Specifically, the phenolic hydroxyl groups in the hindered phenolic antioxidants can react with free radicals to generate stable phenolic oxygen radicals, thereby terminating the radical chain reaction.

5. Blocked phenolic antioxidants

1. Plastic industry: Blocked phenolic antioxidants are widely used in the plastic industry, such as polyethylene, polypropylene, polyvinyl chloride, etc. They can effectively extend the service life of plastics and improve the processing performance of plastics.
2. Rubber industry: In the rubber industry, hindered phenolic antioxidants can improve the oxidation resistance of rubber, prevent rubber aging, and extend the service life of rubber products.
3. Oil industry: Blocked phenolic antioxidants can be used as food additives to prevent oil oxidation and rancidity and extend the storage period of oil.
4. Other fields: In addition to the above fields, hindered phenolic antioxidants can also be used in coatings, adhesives, fibers and other fields to improve the oxidation resistance of materials.

6. conclusion

hindered phenolic antioxidants have a wide range of applications in the field of chemical raw materials due to their unique chemical structure and excellent antioxidant properties. By discussing the properties, synthesis methods, mechanism of action and application fields of hindered phenolic antioxidants, we can better understand and utilize these antioxidants and provide effective solutions for the aging protection of polymer materials.

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