| 摘要 |
An amphoteric betaine-type polycarboxylic acid water reducer and a preparation method therefor are provided in the present invention. An unsaturated betaine-type monomer A and an acrylic acid-type polyethylene glycol monomer B are placed in a reaction container, stirred until uniform and then an acrylic acid-type monomer C is added, the stirring is continued and water is added to make adjustments so as to make the total mass of the monomers account for 10%-20% of the total mass of the aqueous solution; and under the protection of an inert gas, the temperature is raised to 60°C-100°C, an aqueous initiator solution is added, maintaining the temperature and reacting for 4-6 h, and after the reaction is completed, the solution is cooled to room temperature, and the pH value thereof is adjusted to 5-7 to prepare the amphoteric betaine-type polycarboxylic acid water reducer. The polycarboxylic acid water reducer prepared in the present invention has stable performances, a high water reduction rate, a strong cement adaptability, a good compounding effect, does not harm the environment, and can be widely used in the preparation of a high performance concrete, a recycled concrete, a moisture retention concrete, a ceramic product and brick and tile products so as to improve the fluidity, reduce the water consumption and reduce the energy consumption. |
