Study On Synthesizing Technology And Compounding Performance Of Naphthalene-based And Amino-carboxylic-based Superplasticizers

Owing to the situations of research and application of naphthalene-based, aminosulfonic - based superplasticizers and their compounding performance, firstly, the hydrolysis process of synthesizing technology of naphthalene-based superplasticizer was systematically investigated, which has hardly been studid from now on.The obtained results show that the optimum final acidity degree of the hydrolysis process is 28 to 30; although the delayed characteristics of determining acidity degree, the hydrolysis process can be controlled more precisely through coupling the amount of water and final acidity degree in hydrolysis process than through only using the final acidity degree; at the premise of meeting the requirement of hydrolysis acidity degree, the reduction of the amount of hydrolysis water as much as possible, can improve the water-reducing performance of naphthalene-based superplasticizer.Secondly, a new type of superplasticizer, i.e. amino-carboxylic-based superplasticizer was developed by adding carboxylic acid group to the molecular structure of traditional aminosulfonic-based superplasticizer.The influence of synthesizing technology factors of amino-carboxylic-based superplasticizer on its performance were investigated, which included moore ratio of monomer M made by self, moore ratio of formaldehyde and its dropping time, and the concentration of reaction solution. The experimental results show that the performances of amino-carboxylic-based superplasticizer such as water-reducing ratio, compatibility with cement are all better than that of naphthalene-based and traditional aminosulfonic-based superplasticizers. The production cost of the new type superplasticizer developed was reduced by 15%. Lastly, the compounding performances of naphthalene-based and amino-carboxylic-based superplasticizers were also studiedThe results show that the compounded superplasticizer has high water-reducing ratio, good slump retention and good compatibility with cement. These present that the new amino - carboxylic - based superplasticizer has good compounding performance with naphthalene-based superplasticizer.