Metallic Stearates

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Information @ a Glance

  • Compounds of long-chain fatty acids with metals of different valencies some Stearates are not soluble in water.
  • Typical metallic Stearates are Calcium, Zinc, Magnesium and Aluminium.
  • Production process involves when stearic acid is heated to melt in excess water then saponified with strong alkali solution to give soluble soap and water. This mix is reacted with desired products metal salt solution to obtain desired Stearate and a water soluble
    salt.  For Example: [CH3(CH2)nCOOH] + NaOH = [CH3(CH2)nCOONa]+H2O.
  • Applications of Stearates are used as acid scavengers, lubricants and release agents by the plastics
  • Provide unique properties that make them rubber release agents and combination of lubricity, hydrophicity and melt point allow these materials to be used in several applications.
  • Magnesium Stearate is a white, combustible powder, and is not soluble in water. The primary use  is as a pharmaceutical Excipient.
  • Zinc Stearates are insoluble in polar solvents but more soluble in aromatic compounds and its function as an acid scavenger.
  • Aluminium Stearate is a soft, fluffy free flowing bulky powder which has mild antiseptic and astringent properties.
  • Calcium Stearate is used as a stabilizer for plastics with co-stabilizer of Ba-Cd soap.
  • The use of metallic Stearates allows the processor to produce finished articles with smoother surfaces and lower friction.
  • Additionally, In cosmetic products used as shampoos, eyeliners, lipsticks, medicated ointments, body and foot powders etc.
  • Used as dry impregnation and as antistatic agents in textile industry.
  • Growth rate for metallic Stearates mostly tracks major end-use markets such as plastics, coatings, rubbers and greases.
  • Today, a more effective and alternative acid acceptors, metallic Stearates are challenging significantly and which is vary in quality and type.

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