Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Low-temperature synthetic method of multi-branched polycarboxylate superplasticizer
The invention discloses a low-temperature synthetic method of a multi-branched polycarboxylate superplasticizer. The method comprises the steps of 1) adding a base material consisting of unsaturated polyoxyethylene ether and water into a reactor at a set temperature while stirring; 2) after the base material is completely dissolved, adding an initiator, and simultaneously dripping prepared materials A and B; 3) controlling the dripping time of the materials A and B to be 0.5-1.5h, continuously reacting for 0.5-1.5h after dripping, diluting with water, and neutralizing with caustic soda liquid till the pH value is 6-8, thus obtaining the multi-branched polycarboxylate superplasticizer, wherein the material A comprises unsaturated carboxylic acid, unsaturated quaternary ammonium salt monomer and water; and the material B comprises a reducer, a chain transfer agent and water. By adopting the synthetic method of the polycarboxylate superplasticizer, the multi-branched polycarboxylate superplasticizer can be synthesized in one step at 5-30 DEG C; and the selected initiator and reducer are of a low-temperature polymerization initiation system, and water is used as a solvent, so that additional heat energy is not needed in the reaction process, the preparation process is simple, the reaction time is short and the method is environment-friendly and economic.
Low-temperature synthetic method of multi-branched polycarboxylate superplasticizer
The invention discloses a low-temperature synthetic method of a multi-branched polycarboxylate superplasticizer. The method comprises the steps of 1) adding a base material consisting of unsaturated polyoxyethylene ether and water into a reactor at a set temperature while stirring; 2) after the base material is completely dissolved, adding an initiator, and simultaneously dripping prepared materials A and B; 3) controlling the dripping time of the materials A and B to be 0.5-1.5h, continuously reacting for 0.5-1.5h after dripping, diluting with water, and neutralizing with caustic soda liquid till the pH value is 6-8, thus obtaining the multi-branched polycarboxylate superplasticizer, wherein the material A comprises unsaturated carboxylic acid, unsaturated quaternary ammonium salt monomer and water; and the material B comprises a reducer, a chain transfer agent and water. By adopting the synthetic method of the polycarboxylate superplasticizer, the multi-branched polycarboxylate superplasticizer can be synthesized in one step at 5-30 DEG C; and the selected initiator and reducer are of a low-temperature polymerization initiation system, and water is used as a solvent, so that additional heat energy is not needed in the reaction process, the preparation process is simple, the reaction time is short and the method is environment-friendly and economic.
Low-temperature synthetic method of multi-branched polycarboxylate superplasticizer
ZHANG JIANHUAI (Autor:in) / FENG JINZHI (Autor:in) / XIA LEI (Autor:in) / LIN HUAFENG (Autor:in) / FU CHANGHONG (Autor:in)
29.04.2015
Patent
Elektronische Ressource
Englisch
| Europäisches Patentamt | 2023
| Europäisches Patentamt | 2023