Cement grinding aid synergist containing disulfide bond polymer as well as preparation method and application of cement grinding aid synergist

Abstract

The invention relates to a cement grinding aid synergist containing a disulfide bond polymer as well as a preparation method and application of the cement grinding aid synergist, and belongs to the field of concrete admixtures. The cement grinding aid synergist comprises a disulfide bond-containing polymer and a disulfide bond reversible regulation catalyst, the disulfide bond-containing polymer is prepared from the following raw materials in parts by weight: 5 to 100 parts of carboxyl-containing monomer, 5 to 100 parts of sulfo group-containing monomer, 1 to 50 parts of unsaturated monomer, 0.1 to 10 parts of disulfide bond-containing monomer, 10 to 300 parts of alkali, 100 to 5000 parts of solvent and 0.1 to 20 parts of catalyst. The obtained cement grinding aid synergist has the advantages of dissolubility, easiness in construction, good cohesiveness and capability of forming a three-dimensional cross-linked network through molecular rearrangement after construction; when the cement grinding aid is added into the cement grinding aid to be applied to concrete, the obtained concrete has excellent strength performance and anti-aging performance.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a cement grinding synergist containing a disulfide bond polymer, a preparation method and an application thereof. Background technique [0002] How to further optimize and improve the comprehensive properties of concrete (such as construction flexibility, mechanical strength, flame retardancy, etc.) under the premise of environmental protection has become the focus of attention. Since the end of the 20th century, people have been looking for an effective way to improve the comprehensive performance of concrete. At present, the effective way to improve the performance of concrete is mainly to improve some of its properties by introducing water-reducing agents and reducing the amount of water; however, a lot of practice has proved that the addition of a single water-reducing agent cannot coordinate well in the actual construction process. The comprehensive excellent ...

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Problems solved by technology

At present, the effective way to improve the performance of concrete is mainly to improve some of its properties by introducing water-reducing agents and reducing the amount of water; however, a lot of practice has proved that the addition of a single water-reducing agent cannot coordinate well in the actual construction process. The comprehensive excellent performance of concrete, the workability, bleeding and wrapping performance of concrete are still not good, which leads to many defects in concrete during construction, such as: honeycomb, pitted surface, cavity, exposed reinforcement, etc., which seriously affects The comprehensive performance of concrete makes it difficult to exert good mechanical strength, etc., which ultimately affects the overall strength of the building; in addition, the current concrete building materials have poor flame retardancy, and most of them are extremely damaged after being heated or in the presence of open flames. It is easy to support combustion, which makes it a potential dangerous factor after being used in construction

[0003] In order to solve the above problems, it is usually necessary to add concrete modifiers, such as xanthan gum cellulose ethers and polyacrylamides, to improve the constructability and stability of concrete, thereby improving the cohesion and water retention of concrete, and achieving an increase. The purpose of the overall working performance of concrete; another way is to optimize the performance of cement powder itself, including adding grinding aids in the grinding process of cement production, so that the cement powder can achieve good dispersion, small particle size and uniform The particle size distribution of this kind of grinding aid is usually a mixture of different alcohol amines, glycerin and salts, which can achieve a better effect of improving the strength of concrete, but its strong alkalinity and relatively weak activity make it There are certain limitations to the final performance improvement of concrete

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