What is The Application of Ethylenediamine?

Ethylenediamine (EDA), with the chemical formula C2H8N2, is a typical aliphatic diamine and is a colorless or pale yellow oily or watery transparent liquid that produces fumes in the air, with an ammonia-like odor and hygroscopic properties. Its molecular weight is 60.10, melting point is 8.5°C, and autoignition point is 385°C. It is classified as a basic substance, highly soluble in water and ethanol, slightly soluble in ether, and insoluble in benzene unless absolutely dry. It can form azeotropic mixtures with water, n-butanol, and toluene. It is flammable when encountering heat, open flames, or oxidizers, posing a moderate risk during combustion. It can be sterilized by high pressure or filtration.

 

Ethylenediamine (EDA) Application:

1. Chemical raw materials:

Synthetic Polymers: Ethylenediamine is an important raw material for the synthesis of polyamides, polyurethanes, and other polymers. For example, it can react with diacids to produce polyamides, which have excellent mechanical properties, wear resistance, and corrosion resistance, and are widely used in fields such as fibers and engineering plastics.

Production of pesticides and pharmaceutical intermediates: In pesticide production, ethylenediamine can be used to synthesize certain fungicides and insecticides. In the pharmaceutical field, it serves as an intermediary in the synthesis of various drugs, such as those used to produce aminophylline, which can be used to treat respiratory difficulties caused by bronchial asthma and cardiogenic pulmonary edema.

2. Metal ion chelating agent:

Industrial Cleaning: Ethylenediamine can form stable chelates with many metal ions, and it can be used in industrial cleaning to remove rust and scale from metal surfaces, preventing metal corrosion. For example, in the cleaning of car engines, it can effectively remove scale and rust from within the engine, ensuring the normal operation of the engine.

Electroplating Industry: In the electroplating process, ethylenediamine acts as a chelating agent to regulate the concentration and stability of metal ions in the plating solution, making the electroplated layer more uniform and dense, thereby improving the quality of electroplated products.

3. Alkaline reagent:

Acid-base neutralization: Ethylenediamine is basic and can act as a basic reagent in some chemical reactions to adjust the acidity and alkalinity of the reaction system. For example, in certain organic synthesis reactions, it is necessary to carry out the reaction under basic conditions, and ethylenediamine can provide the alkaline environment.

Deacidification reaction: In oil processing, ethylene diamine can be used to remove free fatty acids from fats and oils, improving the quality of the fats.

4. Surfactant:

Emulsification: Ethylenediamine can react with certain acids to form corresponding salts, which have surfactant properties and can be used as emulsifiers. In industries such as cosmetics and food, they are used to prepare emulsions, creams, and other products, allowing the oil phase and water phase to mix evenly, improving the stability and effectiveness of the products.

Dispersing effect: In the industries of coatings and pigments, ethylene diamine and its derivatives can serve as dispersants to ensure that pigment particles are evenly distributed in the medium, preventing pigment agglomeration and enhancing the opacity and coloring power of the coatings.

Epoxy resin curing agent: Ethylenediamine can undergo a cross-linking reaction with the epoxy groups in the epoxy resin, resulting in the curing of the epoxy resin to form a three-dimensional network structure. The cured epoxy resin has good mechanical properties, chemical resistance, and insulation performance, and is widely used in fields such as coatings, adhesives, and electronic packaging. For example, epoxy resin coatings cured with ethylenediamine exhibit excellent weather resistance and anti-corrosion properties, making them suitable for the protection of building exteriors, bridges, and more.

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