Slow-release polycarboxylate superplasticizer preparation method based on atom transfer radical polymerization

• Main Authors: XIN PENGHAO, GUAN JIANAN, LIU XIAO, WANG ZIMING, XI WENBO, PENG JINGYING
• Format: Patent
• Language: Chinese; English
• Published: 16.01.2018
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; REFRACTORIES; SLAG; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF NATURAL STONE

The invention relates to a slow-release polycarboxylate superplasticizer preparation method based on atom transfer radical polymerization. Firstly, a macromonomer initiator is prepared through atom transfer radical polymerization of unsaturated amide micromonomers with a halogenated compound initiator, unsaturated carboxylic ester, unsaturated carboxylate micromonomers and unsaturated polyether macromonomers are initiated by a macromonomer initiator under the action of a catalyst and ligand to be subjected to atom transfer radical polymerization, and thus, the slow-release polycarboxylate superplasticizer is prepared. The method is reasonable in process, simple to operate, low in preparation cost, environmentally friendly and pollution-free, and the slow-release polycarboxylate superplasticizer prepared with the method has a slow release effect on fluidity of concrete and can effectively prevent loss of concrete slump due to long-term transportation. The polycarboxylate superplasticizer prepared with the meth