Amino-sulfonic acid and naphthalene compound water reducing agent and preparation method thereof

Abstract

The invention relates to an amino-sulfonic acid and naphthalene compound water reducing agent and a preparation method thereof. The water reducing agent comprises the following components in percentage by weight: 23 percent to 29 percent of amino-sulfonic acid water reducing agent, 29 percent to 35 percent of naphthalene water reducing agent and 36 percent to 48 percent of water. The preparation method comprises the following steps: heating naphthalene to a molten state; adding concentrated sulfuric acid to sulfonation reaction; then adding water to carry out hydrolysis; adding phenol into sodium hydroxide solution; after uniformly stirring, adding sodium anilinesulfonate to carry out condensation; mixing and stirring two products; and firstly adding formaldehyde, then adding urea and finally adding sodium hydroxide solution to regulate pH to obtain the amino-sulfonic acid and naphthalene compound water reducing agent. The amino-sulfonic acid and naphthalene compound water reducing agent improves performances of high loss speed of the used slump, poor cement adaptability and the like by adding the amino-sulfonic acid water reducing agent into the naphthalene water reducing agent and reaches an effect of improving water reducing rate.

Description

technical field [0001] The invention relates to a water reducer and a preparation method thereof, in particular to a sulfamic acid-based and naphthalene-based composite water reducer and a preparation method thereof, belonging to the field of concrete admixtures. Background technique [0002] Water reducing agent refers to the admixture that can reduce the mixing water consumption and improve the concrete strength under the condition of constant workability and cement dosage of concrete; or save the dosage of cement under the condition of constant workability and strength. [0003] Naphthalene-based water reducer is the earliest used in my country. It is a product of naphthalene sulfonated by sulfuric acid and then condensed with formaldehyde. It belongs to anionic surfactants. The appearance of this type of water reducing agent can be light yellow to dark brown powder depending on the product. It is easily soluble in water and has a good dispersion effect on many powder mat...

AI Technical Summary

Problems solved by technology

However, during the application of sulfamic acid-based water-reducing agents, the water retention of concrete is not good, and bleeding and segregation are serious, which restricts the application of sulfamic acid-based water-reducing agents in concrete.

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