A kind of environment-friendly low-cost sulfamate superplasticizer preparation method

Abstract

The invention discloses an environment-friendly and low-cost sulfamate high-efficiency water reducer preparation method. Polyphenol, sodium sulfamate and water are mixed evenly according to the mass ratio, stirred, and then heated to 70-80°C, adjusted pH value to 10-11; add formaldehyde solution dropwise, after adding, heat up to 90°C, react for 4 hours, add molecular weight regulator, remove low molecular weight compounds, stop reaction and cool, product aging for 5-6 hours, to obtain The solid content is about 40? % dark black environment-friendly low-cost sulfamate superplasticizer. Compared with the traditional preparation method of sulfamate high-efficiency water reducer, this method overcomes the problem that toxic phenol substances are easily volatilized in the production process of the original sulfamate high-efficiency water reducer, and uses low-cost sodium sulfamate instead Sodium p-aminobenzenesulfonate improves the production environment, reduces the impact of the production process of sulfanilate high-efficiency water reducer on the human body and the environment, and reduces production costs.

Description

technical field [0001] The invention belongs to the field of concrete materials, and in particular relates to an environmentally friendly and low-cost sulfamate high-efficiency water reducer preparation method. Background technique [0002] Traditional concrete materials are composed of cement, aggregate and water. With the advancement of civil engineering technology, high-performance concrete has become an important part of civil engineering materials and is widely used in the construction of large buildings, bridges and marine structures. The key to preparing high-performance concrete is the use of high-efficiency water-reducing agents. The use of high-efficiency water-reducing agents in concrete can increase the fluidity of concrete and reduce water consumption in concrete materials by 20-30%. The application of high-efficiency water-reducing agents makes concrete with high durability Materials become possible, and high-efficiency water reducers have become an important p...

AI Technical Summary

Problems solved by technology

Generally speaking, sulfamate high-efficiency water reducer is formed by condensation of sodium p-aminobenzenesulfonate, phenol and formaldehyde. Liquefaction of crystalline phenol, during which toxic and irritating phenol vapors are easily evaporated from the reactor, causing greater pollution to the environment, and more seriously, these toxic phenol substances will pass through the human body The respiratory tract and skin are absorbed by the human body. After the residual phenol enters the human body, it will affect the variation of the human nervous system and human chromosomes. At the same time, the use of sodium p-aminobenzenesulfonate as a sulfonating agent will cause high-efficiency water reduction of the sulfamic acid system. drug price is higher

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