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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method for low-chroma aliphatic superplasticizer
The invention discloses a preparation method for a low-chroma aliphatic superplasticizer. The preparation method comprises the following steps: adding sulfite and water into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel and a reflux condensing tube and carrying out stirring until sulfite is completely dissolved; carrying out heating to 50 DEG C under stirring and gradually adding a cyclic ketone compound into the reaction vessel; carrying out heating to 60 DEG C and dropwise adding an aldehyde compound; after addition of the aldehyde compound, heating a solution to 90 to 95 DEG C and carrying out a thermostatic reaction for 3 to 5 h; adding a molecular weight modifier; and after natural cooling to room temperature, allowing a product to be cured for 2 to 3 h in the reaction vessel so as to obtain the yellow low-chroma aliphatic superplasticizer with a pH value of 9 to 10 and solid content of 30 to 35%. According to the preparation method, sodium hydrogen sulfite and sodium hydroxide produced after hydrolysis of sodium sulfite are used as a sulfonating agent and a catalyst, so volatilization of formaldehyde in the process of sulfonation is avoided, the step of adjustment of the pH value of the solution by using a strongly alkali solution is omitted, process flow is simple, and environmental pollution is reduced; and the cyclic ketone compound is used as reaction monomer to replace traditional acetone, so the chroma of the produced low-chroma aliphatic superplasticizer is reduced.
Preparation method for low-chroma aliphatic superplasticizer
The invention discloses a preparation method for a low-chroma aliphatic superplasticizer. The preparation method comprises the following steps: adding sulfite and water into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel and a reflux condensing tube and carrying out stirring until sulfite is completely dissolved; carrying out heating to 50 DEG C under stirring and gradually adding a cyclic ketone compound into the reaction vessel; carrying out heating to 60 DEG C and dropwise adding an aldehyde compound; after addition of the aldehyde compound, heating a solution to 90 to 95 DEG C and carrying out a thermostatic reaction for 3 to 5 h; adding a molecular weight modifier; and after natural cooling to room temperature, allowing a product to be cured for 2 to 3 h in the reaction vessel so as to obtain the yellow low-chroma aliphatic superplasticizer with a pH value of 9 to 10 and solid content of 30 to 35%. According to the preparation method, sodium hydrogen sulfite and sodium hydroxide produced after hydrolysis of sodium sulfite are used as a sulfonating agent and a catalyst, so volatilization of formaldehyde in the process of sulfonation is avoided, the step of adjustment of the pH value of the solution by using a strongly alkali solution is omitted, process flow is simple, and environmental pollution is reduced; and the cyclic ketone compound is used as reaction monomer to replace traditional acetone, so the chroma of the produced low-chroma aliphatic superplasticizer is reduced.
Preparation method for low-chroma aliphatic superplasticizer
ZHAO HUI (Autor:in) / DENG MIN (Autor:in) / XUAN WEIHONG (Autor:in) / YANG ZHONG (Autor:in) / HAN YING (Autor:in)
17.06.2015
Patent
Elektronische Ressource
Englisch
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