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Method for preparing polycarboxylate water reducer by normal temperature mixing method

A technology of polycarboxylic acid and water reducing agent, applied in the field of building materials, can solve the problems of increased transportation costs and reduced profits, and achieves the effects of short production cycle, avoidance of violent aggregation, and low energy consumption

Inactive Publication Date: 2016-06-22
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Put 100kg of polyether macromonomer isopentenol polyoxyethylene ether, 100kg of water, 10kg of acrylic acid, 2kg of 2-acrylamide-2-methylpropanesulfonic acid, and 3kg of potassium persulfate into the reaction vessel in turn, and turn on the pump The circulation device makes all the raw materials dissolve.

[0023] (2) Put 1 kg of pre-dissolved sodium bisulfite and 0.4 kg of mercaptopropionic acid into the reaction vessel at one time, start the reaction, and close the pump circulation device. The system maintains the reaction by its own redox reaction exotherm, and the temperature reaches the highest point within 0.5-1.5 hours of the reaction, and continues to keep warm for 3 hours after reaching the highest temperature point.

[0024] (3) Add liquid caustic soda for neutralization, turn on the pump circulation device and mix for 5 minutes to obtain a polycarboxylate superplasticizer with a concentration of 40%.

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/58C08F228/02C08F222/02C08F220/18C08F4/40C08F2/38C04B24/26C04B24/16C04B103/30
Inventor 苏晋升方云辉马志武沈建荣
Owner KZJ NEW MATERIALS GROUP CO LTD
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