Alkanolamines are amines containing a single, double, or triple hydroxyalkyl group. They are frequently used as concrete admixtures and grinding aids. The action of triethanolamine (TEA) in the hydration of cement is not described explicitly in the literature since it has still not been concluded whether it is an accelerator or a retarder.
With the rapid development of China's cement industry, the pressure of energy saving and emission reduction is getting bigger and bigger, cement production enterprises will pay more and more attention to the application of grinding aids, and the application prospect of grinding aids will be very broad. The main raw material used by some foreign companies for grinding aids is de-sugar wood sulfonate.
The use of industrial by-products as cement grinding aids has a very broad application prospect. Some foreign scientists use natural bio-glycerol, a by-product of biodiesel manufacturing, to replace common cement grinding aids such as ethylene glycol and hydroxylamine for cement grinding process. Using cement from different regions of Belgium, Greece and Italy, it was found that this bio-glycerol blended with 5% NaCl was more effective than the high-purity grade glycerol. In addition, this bio-glycerol can significantly improve cement.
Triethanolamine and triisopropanolamine on slag cement impact of hydration process
The slag cement has the advantages of low hydration heat, high late strength, inhibition of alkali aggregate reaction, and resistance to sulfate corrosion, and has been applied in a large number of projects. When producing slag cement, because the slag is more greasy than the clinker, the best active particle size can not be achieved when co-grinding, and the single grinding will cause a lot of energy consumption, so it is used in the grinding process. Grinding aids to reduce grinding energy consumption and improve cement performance. Triethanolamine (TEA) and Triisopropanolamine (TIPA) are the main components of common grinding aids.
Physical characteristics of triethanolamine and detailed application in different industry sectors
Triethanolamine is a colorless to pale yellow transparent viscous liquid with a slight ammonia odor and a colorless to pale yellow cubic crystal at low temperatures. The color gradually darkens when exposed to the air. Soluble in water, ethanol, acetone, glycerin and ethylene glycol, etc., slightly soluble in benzene, ether and carbon tetrachloride, and almost insoluble in non-polar solvents. Irritating. It is hygroscopic. It can absorb acid gases such as carbon dioxide and hydrogen sulfide. Pure triethanolamine has no effect on steel, niobium, nickel and other materials, but is highly corrosive to copper, aluminum and its alloys. Unlike monoethanolamine and diethanolamine, triethanolamine and iodohydrous acid can form iodide precipitates. Combustible. Low toxicity. Avoid contact with oxidants and acids.
Description and use of triisopropanolamine products
Triisopropanolamine is a chemical used as a pharmaceutical raw material, a photographic developer solvent. A solvent for paraffin oil in the man-made fiber industry. Since triisopropanolamine and a salt formed by a long-chain fatty acid have good coloring stability, they are particularly suitable as an emulsifier for cosmetics. Triisopropanolamine (TIPA) is a polyhydric alcohol amine organic compound. It is an alcohol amine compound having an amino group and an alcoholic carboxyl group.
Therefore, after the combination of TEA and polycarboxylate superplasticizer, the early strength of the cement test block is significantly improved, the cement setting time is changed to some extent, and the cement dispersibility is slightly reduced. Polycarboxylate superplasticizer is favored by everyone because of its small dosage, high water reduction rate and good compatibility with cement. One of the more important features is that it can add groups with different functions in the main chain. Therefore, it Can be integrated into a variety of functions or have a certain performance to suit different purposes.
Triisopropanolamine [1,1,1′′amino-2-propanol, abbreviated as TIPA] is a product of three homologues, belonging to alkanolamines, an alcoholamine compound having an amine group and an alcoholic hydroxyl group. Because its molecule contains both amino group and hydroxyl group, it has comprehensive properties of amine and alcohol, and has a wide range of industrial applications. It is an important basic chemical raw material.