Method for preparing polycarboxylate water reducer by adopting C6 monomer

Abstract

The invention discloses a method for preparing a polycarboxylate water reducer from a C6 monomer, and relates to the technical field of concrete admixtures. The method comprises the following steps: (1) adding deionized water and an ether C6 monomer into a reaction kettle, and stirring; (2) preparing a material A; (3) preparing a material B; (4) dropwise adding the material A, the material B, an ester C6 monomer and an oxidizing agent into the reaction kettle in the step (1) at the same time; and (5) dropwise adding alkali liquor into the reaction kettle in the step (4), and adjusting the pH value to 7 to obtain a target product. The polycarboxylate water reducer has the beneficial effects that the polycarboxylic acid water reducer is prepared by taking the ether C6 monomer and the ester C6 monomer as raw materials through reactions, and through the synergistic effect of the raw materials, the prepared water reducer is greatly improved in the aspect of water reducing performance, and also has a good performance in the aspects of mud resistance, collapse prevention, adaptability and the like.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a method for preparing polycarboxylate water reducers by using C6 monomers. Background technique [0002] In recent years, with the rapid development of the economy and the country's huge investment in the construction industry, the demand for concrete as the main building material has increased sharply. Lightweight, high-strength, durable, economical and practical high-performance concrete has gradually replaced conventional concrete for In major projects, the key admixture to produce high-performance concrete is concrete water reducer. Concrete water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of the concrete basically unchanged. After adding the concrete mixture, it can disperse the cement particles, improve its workability, reduce Unit water consumption, improve the fluidity of concrete mixture, or reduce...

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Problems solved by technology

[0003] The water reducer can be divided into three stages according to its development history: (1) The first generation of water reducer represented by lignosulfonate appeared in 1935, but its water reducing rate was low, the gas content was large, and it was adaptable to (2) The second-generation water reducer represented by naphthalene series appeared in 1962. This type of water reducer has good water reducing rate and wide application , many types, etc., but there are also low-temperature crystallization that affects construction, heavy product color, and odor, especially the production process is not green and environmentally friendly, which limits its development; (3) The polycarboxylic acid system that appeared in the 1980s represented The third generation of water reducing agent, this kind of water reducing agent has many advantages such as high water reducing, low slump loss, low dosage, good adaptability, especially green environmental protection in product, production process and use process, and can also be The performance of the product is adjusted by designing the structure of the monomer, but this kind of water reducer also has insufficient slump retention in high temperature environments, strong temperature sensitivity, and few functional products, and the price is relatively high.

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