Polycarboxylic superplasticizer, synthesis method thereof and application method thereof

Abstract

The invention discloses a synthesis method of a polycarboxylic superplasticizer. The raw materials for synthesis of the polycarboxylic superplasticizer are APEG of two types of molecular weight (respectively 500-1000 and 1600-2200), MPEGMA of two types of molecular weight (respectively 800-1400 and 2000-2500), maleic anhydride, acrylic acid, alkylphenol ethoxylate, hydrogen peroxide, ascorbic acid, ferrous sulfate, sodium persulfate, sodium hydroxide and deionized water. Since the APEG and MPEGMA of different types of molecular weight are simultaneously adopted as crossing branch chains, the invention not only has a high water-reducing rate, but also maintains good water-reducing rate, has good adaptability to sands and stones with high clay contents, and improves the strength of concrete, Compared with the prior art, the invention has the advantages that the raw materials of the product are easily available, the synthesis process can be easily controlled, the performance of the reaction product is stable, and the cost is reduced by 5-10 percent.

Description

technical field

[0001] The invention relates to a polycarboxylate water reducer, its synthesis method and use method. Background technique

[0002] Polycarboxylate-based water-reducer is a third-generation water-reducer developed after lignosulfonate-based common water-reducers and sulfonated naphthalene-sulfonate-based high-efficiency water-reducers. Due to its low dosage ( Solid accounts for 0.15%-0.25% of the mass of the gelled material), high water-reducing rate (25%-40%), good reinforcement effect (28-day compressive strength ratio greater than 120%), and no formaldehyde is used in the synthesis process so it is environmentally friendly Strong and other characteristics, known as high-performance water reducing agent. Since the successful development of this type of water reducer in my country around 2002, it has been recommended for use in high-speed railways, intercity railways, and passenger dedicated line projects (the annual output in 2009 exceeded 1.2 million tons...