A kind of method that adopts C6 monomer to prepare polycarboxylate water reducer

Abstract

The invention discloses a method for preparing a polycarboxylate water reducer by using a C6 monomer, and relates to the technical field of concrete admixtures. The invention includes the following steps: (1) adding deionized water and an ether C6 monomer into a reaction kettle, Stirring; (2) A material preparation; (3) B material preparation; (4) dropwise A material, B material, ester C6 monomer and oxidizing agent in the reactor in step (1) simultaneously; (5) to Add lye dropwise into the reaction kettle in step (4), adjust the pH value to 7, and obtain the target product. The beneficial effect of the present invention is that: the polycarboxylate water reducer prepared by the reaction of the ether C6 monomer and the ester C6 monomer in the present invention, through the synergistic effect of each raw material, the prepared water reducer not only improves the water reducing performance The aspect has been greatly improved, and it also has a good performance in the mud resistance, anti-collapse, adaptability and other aspects of the water reducing agent.

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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