Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of anti-flocculation amphoteric polycarboxylate superplasticizer
The invention belongs to the field of application of concrete admixtures, and discloses a preparation method of an anti-flocculation amphoteric polycarboxylate superplasticizer, which comprises the following steps: step 1, preparing a mixture A by using unsaturated polyether as a macromonomer; 2, dissolving a chain transfer agent in a reducing agent to obtain a mixture B; step 3, removing the solvent under reduced pressure through rotary evaporation to obtain a faint yellow transparent liquid; step 4, preparing a mixture C; step 5, dropwise adding the mixture B and the mixture C into the mixture A at the same time, and mechanically stirring for 2-6 hours to obtain a reactant of the anti-flocculation amphoteric water reducing agent; and 6, pouring the reactant into a beaker, cooling to room temperature, and adjusting the pH value to 6-8 by using a NaOH aqueous solution to obtain the anti-flocculation amphoteric water reducer. The anti-flocculation amphoteric water reducing agent is used in concrete, and the problems that the fluidity of the concrete is reduced and the slump loss is too large after machine-made sand containing a flocculating agent is added into the concrete can be solved.
本发明属于混凝土外加剂应用领域，公开了一种抗絮凝型两性聚羧酸减水剂的制备方法，包括：步骤1、以不饱和聚醚为大单体，制备混合物A；步骤2、将链转移剂溶解于还原剂中，得混合物B；步骤3、通过旋转蒸发在减压下除去溶剂，得到的淡黄色透明液体；步骤4、制备混合物C；步骤5、将混合物B和混合物C同时滴加到混合物A中，机械搅拌2‑6 h，得到抗絮凝两性减水剂的反应物；步骤6、将反应物倾倒至烧杯中冷却至室温，用NaOH水溶液调节至pH值为6‑8，得到抗絮凝型两性减水剂。本发明将该抗絮凝两性型减水剂用于混凝土中，可以克服因在混凝土中加入含絮凝剂的机制砂后使混凝土流动性降低，坍落度损失过大的问题。
Preparation method of anti-flocculation amphoteric polycarboxylate superplasticizer
The invention belongs to the field of application of concrete admixtures, and discloses a preparation method of an anti-flocculation amphoteric polycarboxylate superplasticizer, which comprises the following steps: step 1, preparing a mixture A by using unsaturated polyether as a macromonomer; 2, dissolving a chain transfer agent in a reducing agent to obtain a mixture B; step 3, removing the solvent under reduced pressure through rotary evaporation to obtain a faint yellow transparent liquid; step 4, preparing a mixture C; step 5, dropwise adding the mixture B and the mixture C into the mixture A at the same time, and mechanically stirring for 2-6 hours to obtain a reactant of the anti-flocculation amphoteric water reducing agent; and 6, pouring the reactant into a beaker, cooling to room temperature, and adjusting the pH value to 6-8 by using a NaOH aqueous solution to obtain the anti-flocculation amphoteric water reducer. The anti-flocculation amphoteric water reducing agent is used in concrete, and the problems that the fluidity of the concrete is reduced and the slump loss is too large after machine-made sand containing a flocculating agent is added into the concrete can be solved.
本发明属于混凝土外加剂应用领域，公开了一种抗絮凝型两性聚羧酸减水剂的制备方法，包括：步骤1、以不饱和聚醚为大单体，制备混合物A；步骤2、将链转移剂溶解于还原剂中，得混合物B；步骤3、通过旋转蒸发在减压下除去溶剂，得到的淡黄色透明液体；步骤4、制备混合物C；步骤5、将混合物B和混合物C同时滴加到混合物A中，机械搅拌2‑6 h，得到抗絮凝两性减水剂的反应物；步骤6、将反应物倾倒至烧杯中冷却至室温，用NaOH水溶液调节至pH值为6‑8，得到抗絮凝型两性减水剂。本发明将该抗絮凝两性型减水剂用于混凝土中，可以克服因在混凝土中加入含絮凝剂的机制砂后使混凝土流动性降低，坍落度损失过大的问题。
Preparation method of anti-flocculation amphoteric polycarboxylate superplasticizer
一种抗絮凝型两性聚羧酸减水剂的制备方法
YU HAO (Autor:in) / JIAN KAI (Autor:in) / YANG WEIBEN (Autor:in) / HU KAIWEI (Autor:in) / YANG ZHEN (Autor:in)
13.01.2023
Patent
Elektronische Ressource
Chinesisch
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