Characteristics and uses of sodium dodecylbenzene sulfonate

Sodium dodecylbenzene sulfonate, referred to as SDBS, is a white or light yellow powder or flake solid. It is hard to volatilize, easily soluble in water, easy to absorb moisture and agglomerate, soluble in water to form a translucent solution. It is chemically stable to alkali, dilute acid and hard water, and can establish a balanced system with strong acid, which is slightly toxic. It is a commonly used anionic surfactant.

Product Usage

1. Washing effect

Sodium dodecylbenzene sulfonate is neutral, sensitive to water hardness, not easy to oxidize, strong foaming power, high detergency, easy to compound with various additives, low cost, mature synthesis process, and application It has a wide range of fields and is an excellent anionic surfactant. Sodium dodecylbenzenesulfonate has a significant decontamination effect on particle dirt, protein dirt and oily dirt. It is particularly effective for washing granular dirt on natural fibers. The detergency increases with the increase of washing temperature. The effect of dirt is higher than that of non-ionic surfactants, and the foam is rich. However, sodium dodecylbenzene sulfonate has two shortcomings. One is that it has poor resistance to hard water, and its decontamination performance can decrease with the hardness of water. Therefore, detergents with it as the main active agent must be combined with an appropriate amount of chelating agent. The second is that it has strong degreasing power, and has a certain irritation to the skin when hand-washed, and the clothes feel poor after washing. Cationic surfactant should be used as a softener to rinse. In recent years, in order to obtain a better comprehensive cleaning effect, sodium dodecylbenzene sulfonate is often used in combination with aliphatic alcohol polyoxyethylene ether (AEO) and other nonionic surfactants. The main purpose of sodium dodecylbenzene sulfonate is to prepare various types of liquid, powder, and granular detergents, cleaners and cleaners.

2. Emulsifying and dispersing agent

Emulsifier is a substance that improves the surface tension between the various constituent phases in the emulsion to form a uniform and stable dispersion system or emulsion. Emulsifiers are surface-active substances with both hydrophilic and lipophilic groups in the molecule. They gather on the oil/water interface, which can reduce the interfacial tension and reduce the energy required to form the emulsion, thereby increasing the energy of the emulsion. As an anionic surfactant, sodium dodecylbenzene sulfonate has good surface activity and strong hydrophilicity, which can effectively reduce the tension of the oil-water interface and achieve emulsification. Therefore, sodium dodecylbenzene sulfonate is widely used in the preparation of emulsions such as cosmetics, printing and dyeing auxiliaries, and pesticides.

3. Antistatic agent

Any object has its own static charge, which can be negative or positive. The accumulation of static charge affects or even harms life or industrial production, and guides and eliminates the accumulated harmful charge so that it is not suitable for production. The chemicals that cause inconvenience or harm to life are called antistatic agents. Sodium dodecylbenzene sulfonate can make the surface of fabrics, plastics, etc. affinity for water, and the ionic surfactant also has a conductive effect, so it can leak static electricity in time, thereby reducing the danger and inconvenience caused by static electricity

4. Other functions

In addition to the above-mentioned applications, it is often used as a cotton fabric refining agent, desizing aid, and leveling agent during dyeing in textile auxiliaries, and as a metal degreasing agent in the metal electroplating process; used in the paper industry Used as resin Dispersant, felt detergent, deinking agent; used as penetrating degreasing agent in leather industry; used as anti-caking agent in fertilizer industry; used as AIR-entraining agent in cement industry and many other aspects or used alone or Used as an ingredient.