A kind of naphthalene series water reducer and its preparation process

Abstract

The invention relates to a naphthalene water reducer and a preparation technology thereof. The naphthalene water reducer is prepared from the following raw materials in parts by weight: 150 to 200 parts of naphthalene oil, 200 to 300 parts of sulfuric acid with the mass fraction of 98%, 100 to 140 parts of formaldehyde, 20 to 50 parts of fatty acid amide, 100 to 120 parts of caustic soda and 1 to 5 parts of a strengthening auxiliary material; the strengthening auxiliary material is prepared from lamellar double hydroxide, beidellite and diethylenetriamine sodium carboxylate after modification; and the strengthening auxiliary material is prepared from the following raw materials in parts by weight: 40 to 50 parts of double hydroxide, 15 to 20 parts of beidellite, 10 to 15 parts of zirconite, 20 to 30 parts of nitric acid, 5 to 10 parts of diethylenetriamine sodium carboxylate and 30 to 40 parts of sodium hydroxide. According to the naphthalene water reducer and the preparation technology thereof disclosed by the invention, the impermeable performance of the naphthalene water reducer is effectively improved by adding the strengthening auxiliary material, the water reduction effect is good, the time-dependent slump is reduced, the time-dependent divergence is improved, the strength of concrete is strengthened, the naphthalene water reducer is convenient for application and transportation of concrete, the liquid waste disposal pressure is alleviated, and the enterprise cost is reduced.

Description

Technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a naphthalene-based water reducing agent and a preparation process thereof. Background technique [0002] Concrete is an indispensable inorganic material in construction engineering. Its admixture is an important product added to concrete to improve concrete's impermeability, compression and frost resistance and other properties. Among them, the most widely used is water reducer, which includes Aliphatic water reducer, naphthalene type water reducer, melamine water reducer, etc. The water reducer is currently the largest and most widely used high-efficiency water reducer in China. However, there are still certain problems in the preparation of naphthalene-based water-reducing agents. The main reason is that the newly mixed concrete is prone to slump loss over time during use, especially in the environment where the temperature rises or the cement hydrates quickly. , The flu...

AI Technical Summary

Problems solved by technology

However, there are still some problems in the preparation process of naphthalene-based water reducers, mainly because the newly mixed concrete is prone to slump loss over time during use, especially in environments where the temperature rises or the cement hydration is rapid , the fluidity of the newly mixed concrete loses quickly, which is not conducive to the pumping and construction of concrete

Although the existing improvement measure is to add a certain amount of slow-release agent to alleviate the hydration of cement, thereby increasing the slump, but its effect is only obvious in the early stage of cement hydration, and such problems still exist in the later stage. Therefore, There is an urgent need for a method to fundamentally improve the slump loss of naphthalene-based superplasticizers over time