Polycarboxylic acid water reducer with solid raw materials and preparing process of the polycarboxylic acid water reducer

Abstract

The invention relates to a polycarboxylic acid water reducer for concrete, and belongs to the technical field of concrete admixture. The water reducer is prepared from the following solid raw materials: unsaturated polyoxyethylene macromonomer, unsaturated dicarboxylic acid or anhydride thereof, unsaturated sulfonate monomer, an oxidant, a reducer and sodium hydroxide at a molar ratio of 1:1-4:0.2-1:0.05-0.2:0.015-0.08:0.5-3. The polycarboxylic acid water reducer has the following beneficial effects: the producing condition requirements are less, so that the water reducer is easy to produce industrially; the raw materials are convenient to transport and store, and obvious pungent smells are not generated from the raw materials and in the process of production, environmental conditions for production are greatly improved, and discharge of waste gas, waste water and waste materials is avoided. The obtained product is featured with high water reducing performance, high slump loss resistance, good adaptability to various admixtures of cement and concrete at a low mixing amount, and high cost performance, and is suitable for popularization and application.

Description

technical field [0001] The invention relates to a water-reducer for concrete, in particular to a carboxylic acid-based water-reducer, which belongs to the technical field of concrete admixtures. Background technique [0002] As an essential component of modern concrete except cement, sand, stone, water and admixtures, water reducing agent promotes the development of concrete technology and can improve the construction of freshly mixed concrete, such as self-leveling concrete , pumping concrete, sprayed concrete, etc.; can also change the concrete ratio, such as increasing the proportion of mineral admixtures in the concrete adhesive, to achieve the purpose of improving the durability of concrete and reducing costs; it can also give different hardened concrete materials Excellent performance to meet a variety of engineering requirements, such as early strength concrete, high strength, ultra-high strength concrete, etc. The emergence of polycarboxylate superplasticizers, with...

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Problems solved by technology

As people's awareness of environmental protection gradually increases, on the basis of improving the performance requirements of polycarboxylate-based water reducers, it has become a further development trend to put forward higher requirements for the green synthesis of polycarboxylates. However, most polycarboxylates The raw materials used in the synthesis process of superplasticizers all involve liquid materials with pungent odors such as acrylic acid, methacrylic acid, thioglycolic acid, etc., which are not conducive to the transportation and storage of raw materials, cause the deterioration of the production environment, and affect the physical and mental health of front-line production workers. Adverse effects on health, and strict requirements for factory site selection and equipment

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