Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Viscosity reduction type polycarboxylic acid concrete water reducing agent and preparation method thereof
The invention relates to a viscosity reduction type polycarboxylic acid concrete water reducing agent and a preparation method thereof. The preparation method comprises the following steps: mixing low-molecular-weight isobutenol polyoxyethylene polyoxypropylene block polyether, isopentenol polyoxyethylene ether and a proper amount of water ,controlling the temperature to range from 40 DEG C to 60 DEG C, and stirring uniformly; dropwise adding a material A consisting of a mixture aqueous solution of unsaturated carboxylic acid, a functional monomer and a chain transfer agent and a material B consisting of a mixture aqueous solution of a chain transfer agent and a reducing agent respectively, and controlling the dropwise adding time to be 2-4 hours; and after dropwise adding is finished, curing for 1-1.5 hours at the temperature of 30-50 DEG C, and cooling to obtain the viscosity reduction type polycarboxylate superplasticizer with the solid content of 40%. The prepared water reducing agent is in a liquid state at normal temperature, is stable in storage performance, can effectively reduce the viscosity of high-grade concrete, especially machine-made sand concrete mixtures, is beneficial to concrete stirring, transportation and pumping, and is particularly suitable for popularization and application of pumping concrete of high-rise and super high-rise buildings and long-distance concrete conveying.
本发明涉及一种降粘型聚羧酸混凝土减水剂及其制备方法，包括：将低分子量异丁烯醇聚氧乙烯聚氧丙烯嵌段聚醚、异戊烯醇聚氧乙烯醚与适量水混合，控制温度为40～60℃，搅拌均匀；分别滴加由不饱和羧酸、功能单体、链转移剂的混合物水溶液组成的A料以及由链转移剂、还原剂的混合物水溶液组成的B料，滴加时间控制在2～4小时；滴加结束后，在30～50℃条件下熟化1～1.5h，降温制得固含量为40％的降粘型聚羧酸减水剂。本发明制备的减水剂在常温下为液态，贮存性能稳定，能够有效降低高标号混凝土尤其是机制砂混凝土拌合物粘度，有利于混凝土搅拌、运输和泵送，尤其适用高层、超高层建筑泵送混凝土以及长距离输送混凝土的推广与应用。
Viscosity reduction type polycarboxylic acid concrete water reducing agent and preparation method thereof
The invention relates to a viscosity reduction type polycarboxylic acid concrete water reducing agent and a preparation method thereof. The preparation method comprises the following steps: mixing low-molecular-weight isobutenol polyoxyethylene polyoxypropylene block polyether, isopentenol polyoxyethylene ether and a proper amount of water ,controlling the temperature to range from 40 DEG C to 60 DEG C, and stirring uniformly; dropwise adding a material A consisting of a mixture aqueous solution of unsaturated carboxylic acid, a functional monomer and a chain transfer agent and a material B consisting of a mixture aqueous solution of a chain transfer agent and a reducing agent respectively, and controlling the dropwise adding time to be 2-4 hours; and after dropwise adding is finished, curing for 1-1.5 hours at the temperature of 30-50 DEG C, and cooling to obtain the viscosity reduction type polycarboxylate superplasticizer with the solid content of 40%. The prepared water reducing agent is in a liquid state at normal temperature, is stable in storage performance, can effectively reduce the viscosity of high-grade concrete, especially machine-made sand concrete mixtures, is beneficial to concrete stirring, transportation and pumping, and is particularly suitable for popularization and application of pumping concrete of high-rise and super high-rise buildings and long-distance concrete conveying.
本发明涉及一种降粘型聚羧酸混凝土减水剂及其制备方法，包括：将低分子量异丁烯醇聚氧乙烯聚氧丙烯嵌段聚醚、异戊烯醇聚氧乙烯醚与适量水混合，控制温度为40～60℃，搅拌均匀；分别滴加由不饱和羧酸、功能单体、链转移剂的混合物水溶液组成的A料以及由链转移剂、还原剂的混合物水溶液组成的B料，滴加时间控制在2～4小时；滴加结束后，在30～50℃条件下熟化1～1.5h，降温制得固含量为40％的降粘型聚羧酸减水剂。本发明制备的减水剂在常温下为液态，贮存性能稳定，能够有效降低高标号混凝土尤其是机制砂混凝土拌合物粘度，有利于混凝土搅拌、运输和泵送，尤其适用高层、超高层建筑泵送混凝土以及长距离输送混凝土的推广与应用。
Viscosity reduction type polycarboxylic acid concrete water reducing agent and preparation method thereof
降粘型聚羧酸混凝土减水剂及其制备方法
WANG WENJUN (Autor:in) / WANG DAOZHENG (Autor:in) / XU JIANJUN (Autor:in) / JI YAJUN (Autor:in) / CHEN NAN (Autor:in) / TANG JIAYUAN (Autor:in) / WU YI (Autor:in) / LI BAOCHUAN (Autor:in)
30.04.2021
Patent
Elektronische Ressource
Chinesisch
| Europäisches Patentamt | 2022
| Europäisches Patentamt | 2022
Viscosity-regulating polycarboxylic acid water reducing agent and preparation method thereof
| Europäisches Patentamt | 2022
| Europäisches Patentamt | 2024