Preparation and Properties of Carbon VI Polycarboxylate Superplasticizer
To determine the best preparation process of C-6 Polycarboxylate superplasticizer and solve the problem of plastic decline with the extension of storage time.Using acrylic acid(AA),ethylene glycol monovinyl polyethylene glycol ether(EPEG)and sodium hypophosphite(SHP)as main raw materials,C-6 Polycarboxylate superplasticizer was prepared by free radical copolymerization.The properties of C-6 Polycarboxylate superplasticizer were studied by heat of hydration,SEM and XRD.When the molecular weight of the polyether monomer was 3 000,the ratio of acid to ether was 5:1,and the initial reaction temperature was 15 ℃ to 20 ℃,the dispersion and plasticity of C-6 Polycarboxylate superplasticizer were the best.C-6 Polycarboxylate superplasticizer is better than HPEG superplasticizer in dispersibility and plasticity.After adding stabilizer,the plasticity of C-6 Polycarboxylate superplasticizer was improved obviously.
polycarboxylate superplasticizerethylene glycol monovinyl polyethylene glycol ethersodium hypophosphiteroom temperature synthesis
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