1H-Benzotriazole / 1,2,3-Benzotriazole CAS 95-14-7

Metal rust prevention is the primary application area for benzotriazole. It is widely used as a highly effective corrosion inhibitor for copper and its alloys, as well as silver and its alloys. When added to rust-preventive oils and greases, it facilitates the storage and protection of metal products, preventing discoloration and rusting during processing. In machining operations, adding it to cutting fluids prevents copper components from discoloring during the manufacturing process. Additionally, benzotriazole serves as an additive in automotive antifreeze to protect copper components within engine cooling systems; it is also used to manufacture vapor-phase rust-inhibiting paper, which releases protective vapors via sublimation into the packaging space to provide long-term rust protection for copper products.

In industrial circulating cooling water systems, benzotriazole is frequently employed as a corrosion inhibitor. It inhibits galvanic corrosion of carbon steel caused by copper ions in the water and prevents corrosion in copper alloy heat exchangers. It is typically used in combination with other scale inhibitors and biocides (such as bactericides and algaecides) to achieve enhanced synergistic effects.

In the field of photography, benzotriazole is primarily used as an antifoggant and stabilizer. In color developers, it acts as a restrainer to prevent fogging and ensure image quality. Furthermore, it is used to prevent the fading of diazo dyes and to protect light-sensitive or discoloration-prone materials such as paper, film, and metal coins.

Benzotriazole and its derivatives serve as important ultraviolet (UV) absorbers and light stabilizers. When added to plastics (such as PVC, PE, and PP), coatings, and rubber, they prevent degradation, yellowing, and embrittlement caused by photo-oxidation, thereby extending the material’s service life. In the field of organic solar cells (OSCs), benzotriazole functions as an electron-deficient heterocyclic unit used to construct polymer donors or small-molecule acceptors, helping to improve the photoelectric conversion efficiency and stability of the cells.

It is a crucial intermediate in the synthesis of various pharmaceuticals. For instance, its derivatives are used to synthesize peptide coupling agents (such as HBTU and TBTU), which are widely applied in the synthesis of peptide drugs and vaccines. Additionally, it is used to synthesize drug molecules that exhibit anti-cancer and antibacterial activities. In the field of pesticides, benzotriazole derivatives can be used to synthesize fungicides and herbicides, or serve as flotation agents for copper ores.

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