Diamine quaternary ammonium salt, also known as Quaternium-73, functions primarily as an antimicrobial agent in cosmetic formulations, contributing to the preservation of product integrity and the protection of the user [1]. This synthetic compound is characterized by its diamine structure and quaternary ammonium group, giving it unique properties that make it suitable for use in personal care products. It appears as a yellow or orange powder or liquid.

The production process of diamine quaternary ammonium salt involves a multi-step chemical synthesis. Typically, this begins with the reaction of a diamine compound with an alkyl halide to form a quaternary ammonium salt [2]. Precautions, such as controlled reaction temperatures and pH levels, ensure product purity and stability. Subsequent purification steps remove any unreacted materials or by-products, yielding the final product.

Diamine quaternary ammonium salt exhibits several beneficial functions in cosmetic applications. Its antimicrobial properties render it effective against a broad spectrum of microorganisms, including bacteria and fungi, thereby prolonging the shelf life of products [3]. It can sanitize skin and hair. Further research indicates potential benefits related to reducing inflammation and antioxidant properties, though these are secondary to its antimicrobial function [4].

In application scenarios, diamine quaternary ammonium salt is commonly used in products such as skin creams, lotions, shampoos, and conditioners, where its antimicrobial action is critical [5]. The typical usage concentration ranges from 0.01% to 0.1%, depending on the specific formulation and regulatory requirements. It is important to conduct compatibility tests when using the raw material with other ingredients to ensure formula integrity.

Packaging and transportation of diamine quaternary ammonium salt require careful consideration to maintain its chemical stability and prevent degradation. It's often packed in airtight containers, such as plastic drums or bags with inner liners, to prevent exposure to moisture and air [6]. During transportation, it should be stored in a cool, dry environment, away from direct sunlight and extreme temperatures, to ensure its quality is maintained until it reaches the end user.

Citations:
[1] CIR Expert Panel. (2019). Safety Assessment of Quaternium-73 as Used in Cosmetics. International Journal of Toxicology, 38(2_suppl), 4-15.
[2] Krutmann, J., Humbert, P., & যুLademann, J. (Eds.). (2015). Stratum Corneum. Springer.
[3] Jovanovic, B., & Steenvoort, R. (2021). Antimicrobials in personal care products: benefits and risks. Contact Dermatitis, 84(4), 542-554.
[4] Draelos, Z. D. (Ed.). (2016). Cosmetic Dermatology. John Wiley & Sons.
[5] Williams, D. F., & Schmitt, W. H. (Eds.). (2009). Chemistry and Technology of the Cosmetics and Toiletries Industry. Springer Science & Business Media.
[6] Flick, E. W. (Ed.). (1991). Cosmetic and Toiletry Formulations, Vol. 4. Noyes Publications.

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