Method for preparing polycarboxylate superplasticizer

A technology of water reducer and polycarboxylate, which is applied in the field of preparation of polycarboxylate water reducer, can solve problems such as inconvenience, achieve the effects of reducing production cost, simplifying process and production equipment, and eliminating the discharge of three wastes
CN106632884AInactive Publication Date: 2017-05-10湖北江城子建材科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
湖北江城子建材科技有限公司
Publication Date
2017-05-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preparing a polycarboxylate superplasticizer. The method comprises the following steps: dissolving isopentenol polyoxyethylene ether in running water so as to form a polyether solution with the mass concentration of 40-55%; adding an active aid, uniformly stirring, and adding an oxidant; dropwise adding acrylic acid aqueous solution and a mixed aqueous solution of a chain transfer agent and a reducing agent; regulating the pH value of the system, wherein the molar ratio of the isopentenol polyoxyethylene ether to the acrylic acid is 1:(3.1-7), the addition amount of the active aid accounts for 1-5% of the mass of the isopentenol polyoxyethylene ether, the addition amount of the chain transfer agent accounts for 0.05-1.5% of the mass of the isopentenol polyoxyethylene ether, the addition amount of the oxidant accounts for 1-3% of the mass of the isopentenol polyoxyethylene ether, and the addition amount of the reducing agent accounts for 0.06-0.8% of the mass of the isopentenol polyoxyethylene ether. The method disclosed by the invention is simple in process, convenient to operate, low in cost and suitable for normal temperature production, and the defects of the preparation method of the existing polycarboxylate superplasticizer are overcome.
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Description

technical field

[0001] The invention relates to a preparation method of a polycarboxylate water reducer, in particular to a method for synthesizing a polycarboxylate water reducer at low temperature using tap water. Background technique

[0002] Polycarboxylate superplasticizer is a kind of graft copolymer containing carboxyl group in the molecule, and the special molecular structure of "comb" is formed by polyoxyethylene. It has low dosage, high water reducing rate, no segregation, slump It is the third-generation high-performance water reducer developed after wood calcium and naphthalene-based ordinary water reducers and high-efficiency water reducers. With the rise of my country's water conservancy, bridges, nuclear power, tunnels, railways and other infrastructure, polycarboxylate water reducers have been used more and more.

[0003] At present, the polyether raw materials for the production of polycarboxylate superplasticizers are mainly polyethylene glycol methyl ethe...

Claims

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