一种碾压混凝土用聚羧酸复合型减水剂及其制备方法
The polycarboxylate composite water-reducing agent prepared by copolymerization adopts a "core-shell" structure formed by modified hydrophobic unsaturated monomers, polyether macromonomers, and unsaturated carboxylic acids. This solves the problems of mismatch in construction performance and poor stability of polycarboxylate water-reducing agents in roller-compacted concrete, and achieves a synergistic effect of high water reduction, low viscosity, long slump retention, and enhanced crack resistance. It is adaptable to the differences in raw materials in various regions and extreme construction environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING HOUDE TRANSPORTATION TECH CO LTD
- Filing Date
- 2026-04-21
- Publication Date
- 2026-07-17
AI Technical Summary
Existing polycarboxylate superplasticizers in roller-compacted concrete suffer from problems such as poor raw material adaptability, mismatched construction performance, insufficient environmental tolerance, and poor stability. They are difficult to achieve the synergistic effects of high water reduction, low shrinkage, crack resistance, and interlayer reinforcement at the same time. Furthermore, the preparation process suffers from problems such as low monomer conversion rate and uneven molecular weight distribution, which cannot meet the needs of green building and multi-scenario construction.
A polycarboxylate composite water-reducing agent for roller-compacted concrete was prepared by copolymerization reaction. Modified hydrophobic unsaturated monomer C was used with polyether macromonomer and unsaturated carboxylic acid to form a multi-level macromolecule with a "core-shell" structure. Combined with emulsifier and solubilizer system, a dynamic hydrophobic association network was constructed to improve early strength and water retention, reduce construction sensitivity, and enhance freeze-thaw resistance and durability.
It achieves a synergistic effect of high water reduction rate, low viscosity, long slump retention and enhanced crack resistance, solves the construction adaptability and durability problems of roller-compacted concrete, meets the standards for large-scale production and certification, and reduces construction difficulty and cost.
Smart Images
Figure CN122080329B_ABST