Synthesis method of phenyl containing polycarboxylic acid water reducer and product thereof

Abstract

The invention provides a synthesis method of a phenyl containing polycarboxylic acid water reducer. The synthesis method comprises following steps: step one, adding phenyl containing polyethylene glycol compounds, acrylic acid (or methacrylic acid), p-toluene sulfonic acid, and a polymerization inhibitor into a first reactor, and carrying out esterification reactions at a temperature of 75-95 DEGC to generate an unsaturated intermediate; and step two, adding the unsaturated intermediate, an unsaturated carboxylic acid, and a persulfuric acid into a second reactor, carrying out free radical copolymerization reactions at a temperature of 55-80 DEG C, and performing a post treatment to obtain the phenyl containing polycarboxylic acid water reducer. The operation of the synthesis method is simple, the cost is low, and the synthesis method is suitable for massive industrial production. The synthesized phenyl containing polycarboxylic acid water reducer has a high primary water-reducing rate, a high cement slurry expansion degree and a wide application prospect.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a synthesis method of a phenyl-containing polycarboxylate water reducer and a product prepared according to the synthesis method. Background technique [0002] Polycarboxylate concrete admixture is the third generation of concrete admixture after lignosulfonate water reducer and naphthalene water reducer. It is widely used in various industrial buildings, civil buildings, roads and bridges at home and abroad. , has become the most widely used and used construction admixture; especially, polycarboxylate concrete admixtures are used in some engineering fields, such as nuclear power projects, high-strength concrete (C60 and above), ultra-high-strength concrete (C80 and Above), high-speed railway engineering, high-rise / super high-rise pumping and other concrete application fields play an irreplaceable role. [0003] In the prior art, the synthesis process of polycarbox...

AI Technical Summary

Problems solved by technology

In the prior art, the method for introducing phenyl functional groups is mainly to utilize organic compounds containing phenyl and unsaturated double bonds such as styrene and propylene to participate in copolymerization; however, there are two main problems in this method. First, benzene Compounds such as ethylene and styrene-propylene have low solubility in water, which is unfavorable for free radical copolymerization of water as a solvent system; the second, directly using organic compounds containing phenyl and unsaturated double bonds to participate in copolymerization will make the already containing unsaturated The reaction system of carboxylic acid and unsaturated modified polyether is more complicated, which increases the influencing factors and is not conducive to the quality control of products