Preparation method of high-performance solid polycarboxylic acid water reducer

Abstract

The invention discloses a preparation method of a high-performance solid polycarboxylic acid water reducer. The preparation method comprises the following steps of: preparing materials: firstly, pumping acrylic acid and thiohydracrylic acid into a first metering tank through a pump as a material A for later use, and then pumping a vitamin C aqueous solution into a second metering tank as a material B for later use; adding water and methyl allyl polyethenoxy ether into a reaction kettle. And heating the mixture till the methyl allyl polyethenoxy ether is dissolved; a polymerization reaction: adding an active protecting agent, a viscosity modifier and an ammonium persulfate aqueous solution into the reaction kettle, and dropwise adding the materials A and B at the same time, and after dropwise addition, keeping the temperature and performing the polymerization reaction on the materials to obtain a liquid polycarboxylic acid water reducer; cooling and slicing: cooling and slicing the liquid polycarboxylic acid water reducer in a slicer; crushing: cooling and slicing the sliced polycarboxylic acid water reducer; and automatically packaging the crushed solid polycarboxylic acid water reducer in a packaging machine. By means of body polymerization-low-temperature slicing and crushing, reduction of performance due to damage of organic structures of active ingredients by high-temperature drying is effectively reduced; in the production process, the water consumption is small and the energy consumption is low.

Description

Technical field [0001] The invention relates to the field of mortar and concrete admixtures, in particular to a method for preparing a high-performance solid polycarboxylic acid water reducing agent. Background technique [0002] Since the late 1980s, Japan, the United States, Germany, etc. began to conduct research, development and engineering applications of polycarboxylic acid superplasticizers, and began to promote them on a larger scale in the mid-1990s. Since 2000, my country has made a lot of achievements in the research and development and industrialization of polycarboxylic acid superplasticizers through a lot of research, and it has been successfully applied in concrete construction projects. [0003] At present, large-scale infrastructure construction is gradually shifting to the central and western regions. In order to reduce carbon and save consumption, most of these projects require the use of polycarboxylic acid plasticizers. In particular, the "Belt and Road" const...

AI Technical Summary

Problems solved by technology

The existing powder technology is realized by spray drying. After drying, the product performance drops seriously. During the drying process, the material is easy to agglomerate and stick to the wall, and there is exhaust gas emission, which has an impact on the environment; the promotion and application encounter bottlenecks! Therefore, it is imminent to develop energy-saving and environmentally-friendly technology for solid polycarboxylic acid products. It is the core material to change the development model of high consumption, high emission, and difficult to recycle in the traditional building materials industry, and to realize the green development of "low-carbon environmental protection, energy-saving, high-efficiency, and cycle safety".

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