Amphoteric betaine-type polycarboxylate superplasticizer and preparation method thereof
US9718733B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2016 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | Mar 8, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/387
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.