Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention discloses a preparation method of a slow-release water reducing agent for cement. The specific preparation process is as follows: adding a branched polyacid ester compound and ammonium persulfate into water, stirring and dissolving; heating to 55-60 DEG C, dropwise adding vinyl acetate and mercaptoacetic acid into the mixture, controlling the mixture to be completely dropwise added within 1 h, then heating to 70-75 DEG C, adding ammonium persulfate into the mixture, carrying out a heat preservation reaction for 3-4 h, and then adding water for dilution until the solid content is30%, so as to obtain the water reducing agent. According to the invention, the hyperbranched water reducing agent is generated through polymerization between the branched polyacid ester compound and vinyl acetate; due to the addition of the water reducing agent, the concrete has high dispersing performance and slump in the initial mixing stage and has long-time slump retaining performance, and theproblems of low dispersing performance of cement particles and short-time slump retaining performance in the initial mixing stage of the concrete while the slow release performance of the existing water reducing agent is realized are effectively solved.
本发明公开一种缓释型水泥用减水剂的制备方法，具体制备过程如下：将支化多酸酯化合物和过硫酸铵加入水中搅拌溶解，升温至55‑60℃后向其中逐滴加入乙酸乙烯酯和巯基乙酸，控制1h内滴加完全，然后升温至70‑75℃再向其中加入过硫酸铵，保温反应3‑4h，然后加水稀释至固含量为30％，得到减水剂。本发明通过支化多酸酯化合物与乙酸乙烯酯之间通过聚合生成超支化减水剂，该减水剂的加入使得混凝土拌制初期即具有较高的分散性能和坍落度，同时具有较长时间的保坍性能，有效解决了现有的减水剂在实现缓释性能的同时其混凝土拌制初期，水泥颗粒的分散性能较低，以及具有短时间保坍性的问题。
The invention discloses a preparation method of a slow-release water reducing agent for cement. The specific preparation process is as follows: adding a branched polyacid ester compound and ammonium persulfate into water, stirring and dissolving; heating to 55-60 DEG C, dropwise adding vinyl acetate and mercaptoacetic acid into the mixture, controlling the mixture to be completely dropwise added within 1 h, then heating to 70-75 DEG C, adding ammonium persulfate into the mixture, carrying out a heat preservation reaction for 3-4 h, and then adding water for dilution until the solid content is30%, so as to obtain the water reducing agent. According to the invention, the hyperbranched water reducing agent is generated through polymerization between the branched polyacid ester compound and vinyl acetate; due to the addition of the water reducing agent, the concrete has high dispersing performance and slump in the initial mixing stage and has long-time slump retaining performance, and theproblems of low dispersing performance of cement particles and short-time slump retaining performance in the initial mixing stage of the concrete while the slow release performance of the existing water reducing agent is realized are effectively solved.
本发明公开一种缓释型水泥用减水剂的制备方法，具体制备过程如下：将支化多酸酯化合物和过硫酸铵加入水中搅拌溶解，升温至55‑60℃后向其中逐滴加入乙酸乙烯酯和巯基乙酸，控制1h内滴加完全，然后升温至70‑75℃再向其中加入过硫酸铵，保温反应3‑4h，然后加水稀释至固含量为30％，得到减水剂。本发明通过支化多酸酯化合物与乙酸乙烯酯之间通过聚合生成超支化减水剂，该减水剂的加入使得混凝土拌制初期即具有较高的分散性能和坍落度，同时具有较长时间的保坍性能，有效解决了现有的减水剂在实现缓释性能的同时其混凝土拌制初期，水泥颗粒的分散性能较低，以及具有短时间保坍性的问题。
Preparation method of slow-release water reducing agent for cement
一种缓释型水泥用减水剂的制备方法
TANG RUQI (Autor:in)
02.10.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C08F
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, erhalten durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
/
C04B
Kalk
,
LIME
/
C07C
ACYCLIC OR CARBOCYCLIC COMPOUNDS
,
Acyclische oder carbocyclische Verbindungen
/
C07F
Acyclische, carbocyclische oder heterocyclische Verbindungen, die andere Elemente als Kohlenstoff, Wasserstoff, Halogen, Sauerstoff, Stickstoff, Schwefel, Selen oder Tellur enthalten
,
ACYCLIC, CARBOCYCLIC, OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
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