Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Special polycarboxylate superplasticizer for UHPC (Ultra High Performance Concrete) and preparation method thereof
The invention is applicable to the field of concrete preparation, and discloses a special polycarboxylate superplasticizer for UHPC and a preparation method thereof, the polycarboxylate superplasticizer comprises water, a polyether macromonomer, unsaturated acid, modified polyol, an oxidizing agent, a reducing agent, a chain transfer agent and vinyl aromatic hydrocarbon; the preparation method of the modified polyol comprises the following steps: mixing polyol and enoyl chloride in an organic solvent, adding an acid-binding agent, carrying out reflux reaction at 60-80 DEG C for 4-8 hours, washing with a saturated sodium bicarbonate solution after dropwise adding, and removing the organic solvent. The water reducing agent synthesized by introducing the modified polyol and the vinyl aromatic hydrocarbon structurally has rich strong hydrophilic groups and strong hydrophobic groups at the same time, the hydrophilic groups can greatly improve the adsorption capacity of the water reducing agent on the surface of a rubber material, and the hydrophobic groups can form a hydrophobic layer on the surface of the rubber material, so that the adsorption capacity of the water reducing agent on the surface of the rubber material is greatly improved. The acting force between the rubber material and water and between the rubber materials is reduced, the content of free macromolecules in free water is greatly reduced, and the effect of reducing the viscosity of the system is achieved.
本申请适用于混凝土制备领域，公开了一种UHPC专用聚羧酸减水剂及其制备方法，聚羧酸减水剂包括水、聚醚大单体、不饱和酸、改性多元醇、氧化剂、还原剂、链转移剂和乙烯基芳烃；改性多元醇的制备方法为取多元醇、烯酰氯在有机溶剂中混合，加入缚酸剂并在60‑80℃下回流反应4‑8小时，滴加结束后用饱和碳酸氢钠溶液洗涤，并除去有机试剂。通过引入改性多元醇与乙烯基芳烃合成的减水剂，结构上可同时具有丰富的强亲水基团和强憎水基团，亲水基团能够大幅提高减水剂在胶材表面的吸附能力，同时憎水基团可在胶材表面形成一层憎水层，降低胶材与水以及胶材与胶材之间的作用力，大大减少游离水中游离高分子的含量，起到为体系降粘的作用。
Special polycarboxylate superplasticizer for UHPC (Ultra High Performance Concrete) and preparation method thereof
The invention is applicable to the field of concrete preparation, and discloses a special polycarboxylate superplasticizer for UHPC and a preparation method thereof, the polycarboxylate superplasticizer comprises water, a polyether macromonomer, unsaturated acid, modified polyol, an oxidizing agent, a reducing agent, a chain transfer agent and vinyl aromatic hydrocarbon; the preparation method of the modified polyol comprises the following steps: mixing polyol and enoyl chloride in an organic solvent, adding an acid-binding agent, carrying out reflux reaction at 60-80 DEG C for 4-8 hours, washing with a saturated sodium bicarbonate solution after dropwise adding, and removing the organic solvent. The water reducing agent synthesized by introducing the modified polyol and the vinyl aromatic hydrocarbon structurally has rich strong hydrophilic groups and strong hydrophobic groups at the same time, the hydrophilic groups can greatly improve the adsorption capacity of the water reducing agent on the surface of a rubber material, and the hydrophobic groups can form a hydrophobic layer on the surface of the rubber material, so that the adsorption capacity of the water reducing agent on the surface of the rubber material is greatly improved. The acting force between the rubber material and water and between the rubber materials is reduced, the content of free macromolecules in free water is greatly reduced, and the effect of reducing the viscosity of the system is achieved.
本申请适用于混凝土制备领域，公开了一种UHPC专用聚羧酸减水剂及其制备方法，聚羧酸减水剂包括水、聚醚大单体、不饱和酸、改性多元醇、氧化剂、还原剂、链转移剂和乙烯基芳烃；改性多元醇的制备方法为取多元醇、烯酰氯在有机溶剂中混合，加入缚酸剂并在60‑80℃下回流反应4‑8小时，滴加结束后用饱和碳酸氢钠溶液洗涤，并除去有机试剂。通过引入改性多元醇与乙烯基芳烃合成的减水剂，结构上可同时具有丰富的强亲水基团和强憎水基团，亲水基团能够大幅提高减水剂在胶材表面的吸附能力，同时憎水基团可在胶材表面形成一层憎水层，降低胶材与水以及胶材与胶材之间的作用力，大大减少游离水中游离高分子的含量，起到为体系降粘的作用。
Special polycarboxylate superplasticizer for UHPC (Ultra High Performance Concrete) and preparation method thereof
一种UHPC专用聚羧酸减水剂及其制备方法
HE ZIYANG (Autor:in) / ZOU XIAOPING (Autor:in) / XI HAIPING (Autor:in) / JIANG JIANSONG (Autor:in) / LIU WENWEN (Autor:in) / GAO PENGHUI (Autor:in) / HUANG WENCONG (Autor:in) / YI PENG (Autor:in) / FAN KAI (Autor:in)
09.04.2024
Patent
Elektronische Ressource
Chinesisch
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