TEOA Triethanolamine 三乙醇胺

Traits:
Colorless to pale yellow transparent viscous liquid with a slight ammonia smell, and becomes colorless to pale yellow cubic crystal system crystals at low temperatures. The color gradually darkens when exposed to the air. It is readily soluble in water, ethanol, acetone, glycerol, and ethylene glycol, slightly soluble in benzene, ether, and carbon tetrachloride, etc., and almost insoluble in non-polar solvents. Solubility at 5℃: benzene 4.2%, ether 1.6%, carbon tetrachloride 0.4%, n-heptane less than 0.1%. It is strongly alkaline, with a pH of 10.5 in a 0.1 mol/L aqueous solution. Stimulating. Hygroscopic. It can absorb acidic gases such as carbon dioxide and hydrogen sulfide. Pure triethanolamine does not affect materials such as steel, iron, and nickel, but is highly corrosive to copper, aluminum, and their alloys. Unlike monoethanolamine and diethanolamine, triethanolamine can form iodide precipitate with iodide and hydrochloric acid (HCI). Flammable. Low toxicity. Avoid contact with oxidants and acids.
Application:
It is used as an emulsifier, moisturizer, humidifier, thickener and PH balancer in cosmetics (including skin cleansers, eye gels, moisturizers, shampoos, etc.). It is used in cosmetic formulas to neutralize fatty acids to form soaps and to neutralize sulfated fatty acids to form amine salts. Triethanolamine is a commonly used emulsifier in cream preparations. Cream products emulsified with triethanolamine have the characteristics of fine paste and bright white paste. In addition, the colloidal phase formed by triethanolamine and higher fatty acids or higher fatty alcohols has good stability, stable product quality, and a high proportion of additional ingredients can be added. Triethanolamine is the most commonly used neutralizer for acidic high-molecular gels such as carbomer. By neutralizing the carboxyl groups of carbomer, triethanolamine forms a stable high-molecular structure, achieving the application effects of thickening and moisturizing.
Adding triethanolamine to liquid detergents can improve the removal of oily dirt, especially non-polar sebum. Meanwhile, by increasing alkalinity, the decontamination performance can be enhanced. And it has excellent compatibility.
It is used as a curing agent for epoxy resin. The reference dosage is 12-15 parts (by mass fraction), and the curing conditions are 80℃ for 4 hours or 120℃ for 2 hours. It can also be used as a vulcanization activator for natural rubber and synthetic rubber, a polymerization activator for nitrile rubber, and can also be used as a lubricating oil and anti-corrosion additive, etc. The long-chain fatty acid salt of triethanolamine is almost neutral and can be used as an emulsifier for oils and waxes.
It is used as a complexing reagent for aluminum ions in solution. This reaction is usually carried out before complexation titration with another chelate (such as EDTA, which can form stable complexes with most metal ions), to "mask" (prevent them from participating in the titration) specific ions in the solution.