Detergent
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Overview
Detergent is a compound, or a mixture of compounds, intended to assist cleaning. The term is often used to differentiate between soap and other chemical surfactants used for cleaning purposes.
Composition
Detergents, especially those made for use with water, often include different components such as:
- Surfactants to 'cut' grease and to wet surfaces
- Abrasive to scour
- Substances to modify pH or to affect performance or stability of other ingredients, acids for descaling or caustics to breakdown organic compounds
- Water softeners to counteract the effect of "hardness" ions on other ingredients
- oxidants (oxidizers) for bleaching, disinfection, and breaking down organic compounds
- Non-surfactant materials that keep dirt in suspension
- Enzymes to digest proteins, fats, or carbohydrates in stains or to modify fabric feel
- Ingredients that modify the foaming properties of the cleaning surfactants, to either stabilize or counteract foam
- Ingredients that affect the aesthetic properties, such as optical brighteners, fabric softeners, colors, perfumes, etc.
- Washing agents may contain soap for the purpose of reducing foam rather than cleaning fabric.
Types
There are several factors that dictate what compositions of detergent should be used, including the material to be cleaned, the apparatus to be used, and tolerance for and type of dirt. For instance, all of the following are used to clean glass. The sheer range of different detergents that can be used demonstrates the importance of context in the selection of an appropriate glass-cleaning agent:
- a chromic acid solution—to get glass very clean for certain precision-demanding purposes, namely in analytical chemistry
- a high-foaming mixture of surfactants with low skin irritation—for hand-washing of drink glasses in a sink or dishpan
- other surfactant-based compositions—for washing windows with a squeegee, followed by rinsing
- any of various non-foaming compositions—for glasses in a dishwashing machine
- an ammonia-containing solution—for cleaning windows with no additional dilution and no rinsing
- ethanol or methanol in Windshield washer fluid—used for a vehicle in motion, with no additional dilution.
Terminology
Sometimes the word detergent is used to be distinguished from soap. For a while during the infancy of other surfactants as commercial detergent products, the term syndet, short for synthetic detergent was promoted to indicate the distinction, but never caught on very well, and is incorrect because of the production of soap via saponification of glycerides. The term soapless soap also saw a brief vogue. There is no accurate term for detergents not made of soap other than soapless detergent or non-soap detergent.
Also, the term detergent is sometimes used for surfactants in general, even when they are not used for cleaning. As can be seen above, this too is terminology that should be avoided as long as the term surfactant itself is available.
It can be noted that plain water, if used for cleaning, is a detergent. Probably the most widely-used detergents other than water are soaps or mixtures composed chiefly of soaps. However, not all soaps have significant detergency. Often the word "soap" is used to indicate any detergent, especially those that have characteristics similar to those of soap.
See also
- Biological detergent
- Household chemicals
- Laundry detergent
- Soap
- Organic Chemistry
External links