Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention relates to a method for low temperature esterification synthesis of a comb-type carboxylic acid polymer. The method comprises the steps: under a vacuum condition, stirring evenly a monohydroxyl polyether and polyacrylic acid aqueous solution and a catalyst having the mass being 0.2-4 wt% of the monohydroxyl polyether and polyacrylic acid in reactant, and introducing nitrogen gas; and under a vacuum condition, adjusting the flow quantity of nitrogen gas to control the gas pressure, heating up to an esterification reaction temperature, then adding a solid acid catalyst with the mass being 0.1-2 wt% of the total mass of the monohydroxyl polyether and polyacrylic acid in reactant, carrying out esterification for 4-8 h, and synthesizing the comb-type carboxylic acid polymer. With use of the method for direct esterification of polyacrylic acid and polyethylene glycol monoether macromolecules to synthesize the polycarboxylic acid water reducing agent under catalysis of a high-catalytic-activity catalyst, the method has the characteristics of simple process, large molecular structure design freedom degree of the product, stable product quality, low reaction temperature, low energy consumption and low production cost.
The invention relates to a method for low temperature esterification synthesis of a comb-type carboxylic acid polymer. The method comprises the steps: under a vacuum condition, stirring evenly a monohydroxyl polyether and polyacrylic acid aqueous solution and a catalyst having the mass being 0.2-4 wt% of the monohydroxyl polyether and polyacrylic acid in reactant, and introducing nitrogen gas; and under a vacuum condition, adjusting the flow quantity of nitrogen gas to control the gas pressure, heating up to an esterification reaction temperature, then adding a solid acid catalyst with the mass being 0.1-2 wt% of the total mass of the monohydroxyl polyether and polyacrylic acid in reactant, carrying out esterification for 4-8 h, and synthesizing the comb-type carboxylic acid polymer. With use of the method for direct esterification of polyacrylic acid and polyethylene glycol monoether macromolecules to synthesize the polycarboxylic acid water reducing agent under catalysis of a high-catalytic-activity catalyst, the method has the characteristics of simple process, large molecular structure design freedom degree of the product, stable product quality, low reaction temperature, low energy consumption and low production cost.
Method for low temperature esterification synthesis of comb-type carboxylic acid polymer
06.05.2015
Patent
Elektronische Ressource
Englisch
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