Nanjing Chemical Material Corp.
Service
Products

Anionic Surfactant: LAS Anionic Surfactant: LAS

Common examples of such active agents are sodium straight-chain alkyl benzene sulfonates and sodium alpha-alkenyl sulfonates. Sodium Linear Alkyl Benzene Sulfonate, also known as LAS, is a white or light yellow powder or flake solid. It is soluble in water. Although the water solubility is poor at lower temperatures, and the solubility in water at room temperature is less than 3, it has good solubility in the compound surfactant system. It is relatively stable to alkali, dilute acid and hard water, and the decomposition temperature is 240°C. The irritation index of 10% solution is 5.0, the microbial degradation rate is 80% to 90%, and the LD50 is 1300 to 2500 mg/kg.


Sodium α-alkenyl sulfonate is also known as AOS. When the active content is 38% to 40%, the appearance is yellow transparent liquid, which is easily soluble in water. It has good stability over a wide PH range. At PH2, PH4 and PH10, its hydrolysis rate is 0. It is less irritating to the skin, the microbial degradation rate is 100%, and the LD50 is 1300-2400 mg/kg. Among them, LAS is generally not used in shampoo, and is rarely used in body wash. It is often used in laundry detergent and dishwashing detergent. The LAS in the detergent can account for about half of the total surfactant, and the actual adjustment range of the proportion of LAS in the laundry liquid is very wide.


Ⅰ. The compound system of LAS


The water solubility of LAS is mainly reflected at higher temperature (such as 60°C) and under the conditions of compounding with certain surfactants. The typical compound system used in detergent is the ternary system "LAS-AES-FFA". The compound system used in laundry detergent is "LAS-soap base-η·SAA". It is worth noting that the direct compounding of LAS with the nonionic surfactant alkyl alcohol amide may not achieve good results. The "LAS-FFA" system is unstable with low viscosity and white milky appearance.


Ⅱ. LAS is the most cost-effective synthetic surfactant


LAS is the cheapest synthetic surfactant variety with the largest output (290kt/a). LAS has the lowest price among the top 5 synthetic surfactants in terms of yield, and is comparable to soap base (fatty ester soap) among common anionic surfactants. The outstanding advantages of LAS are good stability, good detergency, and low price, while the outstanding disadvantage is that it is highly irritating.

Related News
  • Mild Action of Amphoteric Surfactants on the Skin

    Mild Action of Amphoteric Surfactants on the Skin

    January 15, 2021Amphoteric surfactants are surfactants that contain both anionic and cationic hydrophilic groups in the same molecule. The greatest characteristic is that it gives and receives protons. In use they ha...view
  • Driving Innovation: Expandable Microspheres Producers in the Aerospace Industry

    Driving Innovation: Expandable Microspheres Producers in the Aerospace Industry

    November 9, 2023The aerospace industry is known for its relentless pursuit of innovation and cutting-edge technologies. Among the many contributors to advancements in this sector are expandable microspheres producers...view
  • Commonly Used Amphoteric Surfactants in Detergents

    Commonly Used Amphoteric Surfactants in Detergents

    May 9, 2025In our daily laundry and dishwashing, detergents are our good helpers. However, the components inside that small bottle of detergent contain a lot of knowledge. Today, let's delve into the "l...view
  • Application and Storage and Transportation Protection of Potassium Iodide

    Application and Storage and Transportation Protection of Potassium Iodide

    July 12, 2022Ⅰ. Understand potassium iodidePotassium iodide is an inorganic compound with the chemical formula KI, which is colorless or white crystal, odorless, and has a strong bitter and salty taste. It is use...view
  • Happy Mid-Autumn Festival

    Happy Mid-Autumn Festival

    January 30, 2018There are always debates among Chinese on the flavors of certain traditional Chinese food such as dumplings, tofu pudding and moon cake about choosing sweet or salty. This Mid-Autumn Festival, let’s ...view
  • Myristoyl Chloride

    Myristoyl Chloride

    October 13, 2021Myristoyl Chloride also known as tetradecanoyl Chloride. It's a colorless liquid.The substance may be harmful to the environment and special attention should be paid to the pollution of water bodies. ...view
  • TEL:+86-25-52337978
  • EMAIL: info@njchm.com
  • ADDRESS:12/F, Block B, Technology and Innovation Building, Nanjing University of Technology, No.5 New Model Road, Nanjing 210009, China