A kind of preparation method of early strength agent suitable for alpine and high altitude areas

Abstract

The invention provides a kind of preparation method that is applicable to the early strength agent of alpine, high altitude area, it is characterized in that: comprise the following steps: (1)R 3 NH 2 with R 1 -C=C-R 2 ‑X under the action of a catalyst, carry out an alkylation reaction at 120‑150°C to obtain monomer M; (2) add hydrogen peroxide in deionized water, stir and dissolve, add monomer M, and stir evenly to obtain material A; (3) ) adding ascorbic acid and double-bond quaternary ammonium salt monomer into deionized water, stirring evenly to obtain material B; (4) adding material B dropwise into material A at a constant speed, and reacting at a constant temperature to obtain the early strength agent. The preparation method of the early-strength agent suitable for high-cold and high-altitude areas of the present invention uses aliphatic amine monomers to carry out alkylation reactions with halogenated olefins to obtain a monomer containing both double bonds and N atoms, and then Carry out free radical polymerization with quaternary ammonium salt monomers containing double bonds to obtain early-strength polymers.

Description

Technical field [0001] The present invention belongs to the field of concrete extension, in particular, to a preparation method suitable for early strength agents for high-precipitation and high altitude. Background technique [0002] Due to the high temperature and low temperature difference, the high temperature difference is large, and the concrete completed by the rigidity is very easy to suffer, resulting in decreased the durability of concrete, so the demand for unhealthy-strong performance is also increasingly increasing. [0003] The early strong agent can accelerate cement hydration, effectively shorten the concrete coagulation time, significantly improve the early strength of concrete, and thus the development of modern concrete has played an irreplaceable role. The early warranty current used is generally inorganic salts, organic small molecules, organic inorganic compounds. However, inorganic salts have high dosage, which is easy to cause excessive concrete alkali con...

AI Technical Summary

Problems solved by technology

However, inorganic salts have a high dosage, which can easily cause excessive alkali content in concrete, resulting in a decrease in the durability of concrete. Chlorine-containing salts can easily lead to corrosion of concrete reinforcement; organic small molecules such as triethanolamine, the dosage is not good Control, when added in a small amount, it shows early strength performance, but once the dosage is increased, the concrete will retard setting due to the existence of hydroxyl groups, affect the initial and final setting time, prolong the production cycle, and even cause concrete quality accidents

At present, there are polymeric accelerator products on the market one after another, but the effect is not significant

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