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The invention discloses a special water-reducing shrinkage reducing agent for UHPC (Ultra High Performance Concrete) as well as a preparation method and application of the special water-reducing shrinkage reducing agent. The special water-reducing shrinkage reducing agent for UHPC is mainly prepared from the following raw materials in molar ratio: 1.0 of vinyl polyoxyethylene ether macromonomer, 3.0-8.0 of unsaturated acid small monomer, 0.5-2.0 of hydrophobic unsaturated small monomer, 0.05-0.30 of initiator and 0.05-0.20 of chain transfer agent. Wherein the hydrophobic unsaturated small monomer is mainly prepared from the following raw materials in molar ratio: 1.0 percent of 2-methyl-1, 3-butadiene and 1.0 to 1.05 percent of unsaturated small monomer containing hydrophobic groups. The special water-reducing shrinkage reducing agent for the UHPC is used for preparing concrete, the process of synthesizing the special water-reducing shrinkage reducing agent for the UHPC by adopting a Diels-Alder reaction and an in-situ polymerization reaction is simple, and the defects of low dispersion speed, high viscosity, poor retention, poor shrinkage reducing and crack resistance and the like when an existing shrinkage reducing agent is used in the UHPC are overcome.
本发明公开了一种UHPC专用减水型减缩剂及其制备方法和应用，所述UHPC专用减水型减缩剂主要由以下摩尔比的原料制成：乙烯基聚氧乙烯醚大单体1.0，不饱和酸类小单体3.0～8.0，疏水型不饱和小单体0.5～2.0，引发剂0.05～0.30，链转移剂0.05～0.20；其中，所述疏水型不饱和小单体主要由以下摩尔比的原料制成：2‑甲基‑1，3‑丁二烯1.0，含有疏水基团不饱和小单体1.0～1.05。所述UHPC专用减水型减缩剂用于制备混凝土，本发明采用Diels‑Alder反应和原位聚合反应合成UHPC专用减水型减缩剂的过程，工艺简单，改善了现有减缩剂在UHPC中使用存在的分散速度慢、粘度高、保持差以及减缩抗裂性差等缺点。
The invention discloses a special water-reducing shrinkage reducing agent for UHPC (Ultra High Performance Concrete) as well as a preparation method and application of the special water-reducing shrinkage reducing agent. The special water-reducing shrinkage reducing agent for UHPC is mainly prepared from the following raw materials in molar ratio: 1.0 of vinyl polyoxyethylene ether macromonomer, 3.0-8.0 of unsaturated acid small monomer, 0.5-2.0 of hydrophobic unsaturated small monomer, 0.05-0.30 of initiator and 0.05-0.20 of chain transfer agent. Wherein the hydrophobic unsaturated small monomer is mainly prepared from the following raw materials in molar ratio: 1.0 percent of 2-methyl-1, 3-butadiene and 1.0 to 1.05 percent of unsaturated small monomer containing hydrophobic groups. The special water-reducing shrinkage reducing agent for the UHPC is used for preparing concrete, the process of synthesizing the special water-reducing shrinkage reducing agent for the UHPC by adopting a Diels-Alder reaction and an in-situ polymerization reaction is simple, and the defects of low dispersion speed, high viscosity, poor retention, poor shrinkage reducing and crack resistance and the like when an existing shrinkage reducing agent is used in the UHPC are overcome.
本发明公开了一种UHPC专用减水型减缩剂及其制备方法和应用，所述UHPC专用减水型减缩剂主要由以下摩尔比的原料制成：乙烯基聚氧乙烯醚大单体1.0，不饱和酸类小单体3.0～8.0，疏水型不饱和小单体0.5～2.0，引发剂0.05～0.30，链转移剂0.05～0.20；其中，所述疏水型不饱和小单体主要由以下摩尔比的原料制成：2‑甲基‑1，3‑丁二烯1.0，含有疏水基团不饱和小单体1.0～1.05。所述UHPC专用减水型减缩剂用于制备混凝土，本发明采用Diels‑Alder反应和原位聚合反应合成UHPC专用减水型减缩剂的过程，工艺简单，改善了现有减缩剂在UHPC中使用存在的分散速度慢、粘度高、保持差以及减缩抗裂性差等缺点。
Special water-reducing shrinkage reducing agent for UHPC as well as preparation method and application of special water-reducing shrinkage reducing agent
一种UHPC专用减水型减缩剂及其制备方法和应用
2023-12-12
Patent
Electronic Resource
Chinese
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