Temperature-resistant and anti-collapse multi-branched polymer fluid loss reducer and preparation method thereof
US11447589B2 · kind B2 · utility
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Key dates
| Filing date | Dec 16, 2019 |
| Grant date | Sep 20, 2022 |
| Priority date | — |
| Expiry date | Jul 15, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/585
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A main chain of a temperature-resistant and anti-collapse multi-branched polymer fluid loss reducer is composed of the following repeating unit (I): In the repeating unit (I): x:y:z=(20˜80):(20˜80):(2˜30); the R1 and R2 groups are alkylamines having a multi-branched structure. The beneficial effect of the multi-branched polymer fluid loss reducer is: introducing cheap acrylamide branch monomer into the polymer monomer system of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid, the preparation process is simple, the reaction conditions are mild, and the production cost is significantly reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.