Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of high-slump-loss-resistant polycarboxylic acid water reducing agent
The invention discloses a preparation method of a high slump loss resistant polycarboxylate superplasticizer, which is prepared by adopting isopentenol polyoxyethylene ether (TPEG), acrylic acid (AA), hydroxyethyl acrylate (HEA), hydroxypropyl acrylate (HPA) and methyl allyl tartaric acid monoester as raw materials, adopting mercaptopropionic acid as a chain transfer agent and adopting a hydrogen peroxide-Vc initiation system through free radical polymerization. The synthesized high-slump-loss-resistant polycarboxylic acid water reducer is good in performance, the problem that the slump loss of concrete is too fast under the condition of high temperature or high silt content of gravel or under the condition of long-distance transportation is solved, and the purpose of keeping the slump for a long time is achieved by introducing different slow-release functional groups; when the solid mixing amount is 0.3%, the slump retaining time of the concrete can reach 3 hours, and the concrete slump retaining agent is very suitable for concrete with relatively long working time requirements.
本发明公开了一种高保坍型聚羧酸减水剂的制备方法，采用异戊烯醇聚氧乙烯醚（TPEG）、丙烯酸（AA）、丙烯酸羟乙酯（HEA）、丙烯酸羟丙酯（HPA）和甲基丙烯基酒石酸单酯为原材料，以巯基丙酸为链转移剂，采用双氧水‑Vc引发体系，通过自由基聚合而成。合成的高保坍型聚羧酸减水剂性能好，克服混凝土在高温情况下或砂石含泥量高的情况下或长距离运输情况下坍落度损失快过快的问题，通过引入不同的缓释型官能团，达到长时间坍落度保持的目的；当折固掺量为0.3%时，混凝土保坍时间可达3小时，非常适用于对工作时间要求较长的混凝土。
Preparation method of high-slump-loss-resistant polycarboxylic acid water reducing agent
The invention discloses a preparation method of a high slump loss resistant polycarboxylate superplasticizer, which is prepared by adopting isopentenol polyoxyethylene ether (TPEG), acrylic acid (AA), hydroxyethyl acrylate (HEA), hydroxypropyl acrylate (HPA) and methyl allyl tartaric acid monoester as raw materials, adopting mercaptopropionic acid as a chain transfer agent and adopting a hydrogen peroxide-Vc initiation system through free radical polymerization. The synthesized high-slump-loss-resistant polycarboxylic acid water reducer is good in performance, the problem that the slump loss of concrete is too fast under the condition of high temperature or high silt content of gravel or under the condition of long-distance transportation is solved, and the purpose of keeping the slump for a long time is achieved by introducing different slow-release functional groups; when the solid mixing amount is 0.3%, the slump retaining time of the concrete can reach 3 hours, and the concrete slump retaining agent is very suitable for concrete with relatively long working time requirements.
本发明公开了一种高保坍型聚羧酸减水剂的制备方法，采用异戊烯醇聚氧乙烯醚（TPEG）、丙烯酸（AA）、丙烯酸羟乙酯（HEA）、丙烯酸羟丙酯（HPA）和甲基丙烯基酒石酸单酯为原材料，以巯基丙酸为链转移剂，采用双氧水‑Vc引发体系，通过自由基聚合而成。合成的高保坍型聚羧酸减水剂性能好，克服混凝土在高温情况下或砂石含泥量高的情况下或长距离运输情况下坍落度损失快过快的问题，通过引入不同的缓释型官能团，达到长时间坍落度保持的目的；当折固掺量为0.3%时，混凝土保坍时间可达3小时，非常适用于对工作时间要求较长的混凝土。
Preparation method of high-slump-loss-resistant polycarboxylic acid water reducing agent
一种高保坍型聚羧酸减水剂的制备方法
ZOU LINGJUN (Autor:in) / SUN WEIWEI (Autor:in) / CUI QINGLONG (Autor:in) / LEI HANG (Autor:in) / CHEN BO (Autor:in)
23.07.2024
Patent
Elektronische Ressource
Chinesisch
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Slump-retaining polycarboxylic acid water reducing agent and preparation method thereof
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