It is understood that triethanolamine is a colorless, transparent and viscous liquid at room temperature. Has a slight ammonia smell. It is hygroscopic and can absorb moisture and carbon dioxide in the air. Can be freely mixed with water and alcohol, soluble in chloroform, slightly soluble in benzene and ether.
The role of triethanolamine in cement:
Triethanolamine and its salt solution are used as engineering admixtures and drought strength agents in the cement clinker grinding process. (0.1% of the total mass) can not only prevent the aggregation of powder particles and the air cushion effect in the powder-water process, improve the fluidity and filling density of cement, but also reduce the power consumption of the crusher.
Triethanolamine has the properties of a tertiary amine and is less alkaline than ammonia. It can absorb CO2 and H2S. Its aqueous solution is alkaline and can react with inorganic or organic acids to form salts. It can also form with higher fatty acids. fat. It can chelate with a variety of heavy metals to form stable chelates with 2-4 coordinations. It is an excellent chelating agent. Generally, liquid ammonia is first prepared into a certain concentration of ammonia water, and then mixed with ethylene oxide under slight heating. reaction.
The main raw materials of cement grinding aids (accounting for about 15% of the total grinding aid formula). Adding grinding aids can increase cement output by 10%-20%; directly adding cement grinding aids Materials are used to assist grinding (the proportion is about one ten thousandth), and ball grinding after mixing can not only increase cement output, but also increase fineness, improve quality standards, and reduce energy consumption.
The main raw materials of grinding aids are activated substances such as triethanolamine and triisopropanolamine. They do not disappear after grinding but remain in the cement product. They are also good complexing agents, which accelerate the hydration heat release during the cement hydration process, accelerate the interaction between tricalcium aluminate and gypsum, and form ettringite as quickly as possible to produce an enhancement effect. In the alkaline solution of cement hydration, it can form relatively stable complex ions with Fe3+ and Al3+ plasma. This complex ion reacts with the hydration of cement to form a complex salt with very low solubility. Therefore, triethanolamine and triisopropanolamine It does not change the hydration products of the cement, but only promotes the reaction between the components in the cement, and finally forms ettringite after reacting with other substances. As the amount of solid phase precipitation in the system increases, the strength of the cement stone also increases. �
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