| abstract |
Disclosed is a method for preparing a block slow-release concrete admixture. The present invention utilizes aqueous solution free radical copolymerization, uses unsaturated monomers, initiators, chain transfer agents, and the like to prepare a block polymer by means of a two-step method, and has the advantages of good operability, an easy-to-control reaction process, low sensitivity to reaction conditions, and easy industrial production. By means of introducing polyether side chains of different types and lengths into a molecular side chain, it is possible to control the spatial configuration and degree of extension of concrete admixture in a concrete multi-phase system; by means of introducing carboxylic acid hydroxy ester, crosslinking monomer, and the like into a molecular backbone chain, it is possible to improve the lubricating effect and hydrophilic state of particles in multiple concrete systems, improving the slump retention of the concrete mixture, reducing the loss of concrete over time, and reasonably controlling the working state of the concrete. |