Method For Preparing Polycarboxylic Acid High Efficiency Water Reducing Agent

- May 10, 2017 -

Polycarboxylate superplasticizer in the use of people to provide a great convenience, but in the preparation of the time is not so simple,

Synthesis of poly carboxylic acid water reducing agent of main raw materials required: methacrylic acid, acrylic acid, ethyl acrylate, ethyl acrylate, sodium allyl sulfonate, methyl methacrylate, methacrylic acid, acrylamide -2- 2- methoxy polyoxyethylene methyl acrylate and ethoxy polyethylene glycol acrylate and allyl ether, in the polymerization process can be the initiator: agent, benzoyl peroxide, azo two isobutyl cyanide persulfate salt; chain transfer agent: 3- mercapto propionic acid, mercapto acetic acid, mercapto ethanol and isopropanol.

In an electric mixer, thermometer, liquid dropping device, and reflux condenser tube round bottom flask, through the method of water bath heating slowly dripping monomer solution and initiator solution, in the selection of monomer, should give full consideration to the reactivity ratio of the University, according to the specific reaction temperature reaction monomer to determine the type, general can choose the temperature range of 70~95 DEG C temperature as the reaction temperature, within an hour after adding the monomer solution, and then drop in 20min solution with residual initiator, the temperature rise of 5 degrees Celsius, continue to react with 1H, cooled to 40 DEG C, and discharge.

Polycarboxylate superplasticizer is very troublesome in the preparation of the time, this requires careful, careful, there may not be any careless, prevent mistakes, then methods for the understanding of it, I believe we will bring great convenience.

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