Preparation method of polycarboxylate superplasticizer with carbon dioxide
US10179750B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2017 |
| Grant date | Jan 15, 2019 |
| Priority date | — |
| Expiry date | Aug 28, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2800/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention discloses a preparation method of a polycarboxylate superplasticizer with carbon dioxide, comprising the following steps: (1) preparing a polycarboxylate superplasticizer prepolymer: performing an oxidation-reduction radical polymerization of an unsaturated macromonomer, an unsaturated phenol derivative, a reducing agent, an initiator and a chain transfer agent with different proportions under a nitrogen atmosphere to obtain a novel polycarboxylate superplasticizer prepolymer with different molecular weight; adjusting the pH by adding an alkali; (2) preparing a polycarboxylate superplasticizer: performing a Koble-Schmitt reaction between the polycarboxylate superplasticizer prepolymer and a carbon dioxide for a certain time to obtain the polycarboxylate superplasticizer. The polycarboxylate superplasticizer prepared by the method of the present invention retains the advantages of the existing water-reducing admixture of the polyether monomer compounds, and the production process is simple, safe, controllable, less side effect and has a better cost effective and competitive advantage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.