The Triisopropanolamine,Diethanolisopropanolamine,Triethanolamine as cement grining aid could effective participate in hydration reaction with , C3A, C3S, C2S, and C4AF.
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.
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.
The effect of the combination of TEA and TIPA on Portland cement is similar to the superposition of the effects of the two monomer grinding aids alone, and there is no change in the hydration product due to the composite, and the hydration process is not significantly changed
TEA) polymerization to obtain intermediate M, and then with isoprenol polyoxyethylene ether (TPEG), acrylic acid (AA) polymerized under aqueous conditions to obtain polycarboxylic acid - Alkanolamine cement grinding aids,
The use of triisopropanolamine cement grinding aids has good grinding effect and significantly improves the strength of the later period of the cement. The raw material triisopropanolamine is based in China and reduces the cost of cement grinding, and has broad application prospects.
Foreign cement grinding aid products, most of the manufacturers also a few models, the technology is relatively mature, and its formulations are also basically fixed, do not need to change the formula often in order to adapt to changes in cement and seasons, as the concrete admixture products It is a single or composite product such as amines(Diethanolisopropanolamine,Triethanolamine,Triisopropanolamine),polyols, and acetates.