Method for preparing polycarboxylate water reducing agent by normal-temperature mixing process

Abstract

The invention discloses a method for preparing a polycarboxylate water reducing agent by a normal-temperature mixing process. A polyether macromonomer, a redox, acrylic acid, an unsaturated third monomer, a chain transfer agent and water are mixed once at normal temperature to prepare the polycarboxylate water reducing agent. The method disclosed by the invention adopts a one-time mixing mode; in a synthesis process, a pump circulation device only runs in a pre-dissolving macromonomer, and the device is closed after the pre-dissolved reducing agent component is fed. The traditional production method adopts an elevated tank dropping mode to produce the polycarboxylate water reducing agent, and the production is performed in a reaction kettle, so that the equipment cost input is relatively high. In the method disclosed by the invention, a one-time mixing process is adopted creatively, and the method is performed in a normal-temperature way without needing a heat source, so that the production period is short, the energy consumption is low, and the synthesis process does not need a stirring device, a professional for monitoring and an enamel reaction kettle device; the concrete performance of the synthesized polycarboxylate water reducing agent is equivalent to that of the water reducing agent synthesized by the traditional process, a favorable reference basis is provided for workshop-style water reducing agent production, and the polycarboxylate water reducing agent has obvious advantages.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a preparation method of a polycarboxylate water reducer. Background technique [0002] At present, in the water reducer market, polycarboxylate water reducers are playing an increasingly important role as the third generation of water reducers, and their unique advantages such as high water reducing rate, low dosage, and low pollution are gradually replacing the first Second generation water reducer. [0003] The traditional polycarboxylic acid production method uses an enamel reaction kettle, but in actual production, it is carried out by dripping in a high-level tank, and steam heating is required, and the equipment cost is relatively high. At present, the research on polycarboxylic acid has entered the normal temperature stage, and many researchers have conducted a lot of research on the normal temperature synthesis method of polycarboxylic acid. However, it basic...

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Problems solved by technology

However, it is basically used in the way of dropping materials and requires a stirring device. In remote areas or for small compounding factories, due to the complexity and uncertainties of the transportation process, the transportation cost often increases and the profit decreases.

At present, there are few reports on the synthesis of polycarboxylate water reducer by one-time feeding method