High performance polycarboxylic acid type concrete water reducing agent and preparation method thereof

Abstract

The invention relates to a high performance polycarboxylic acid type concrete water reducing agent, which is widely applied to the field of engineering construction such as buildings, water conservancy, road traffic and the like. The water reducing agent is prepared from the following raw materials: methacrylate polyglycol monoester, acrylamide, maleic anhydride, mercaptoethanol, an initiating agent, a defoaming agent, sodium bicarbonate and the like. A preparation method for the water reducing agent comprises the following process steps of: carrying out esterification reaction to obtain the methacrylate polyglycol monoester; and carrying out graft copolymerization reaction on the methacrylate polyglycol monoester to obtain the polycarboxylic acid type water reducing agent. The preparation method has the advantages of simple process, easy control of reaction materials, no environmental pollution and low cost, and a product has the advantages of high water reducing rate, high later strength of concrete, low air-entraining performance and the like. The water reducing agent can effectively restrain loss of concrete slump, solves the problem of poor later strength of the concrete, and has obvious economic benefit and social benefit.

Description

technical field [0001] The content of the invention belongs to the technical field of chemical preparations for building materials, and relates to a preparation method of a concrete water reducer, in particular to a polycarboxylate water reducer product for mixing commercial concrete and a preparation method thereof. Background technique [0002] Concrete water reducer is an admixture used to reduce the water required for concrete hardening, thereby improving the strength of concrete. The traditional concrete water reducer is mainly based on naphthalene and melamine products. In recent years, with the vigorous development of the construction industry at home and abroad, the demand for concrete superplasticizers has increased year by year. Concrete has developed in the direction of high strength, light weight and construction fluidization. Water action and better slump performance. Because the traditional naphthalene-based and melamine-based water-reducing agents have proble...

AI Technical Summary

Problems solved by technology

It can be seen from the above work that there are many methods in the field of polycarboxylate superplasticizer, but due to its complicated process, many preparation methods and mechanisms are immature, and the product stability is poor, it is still in the initial research stage. Even if a small amount of products are applied, they are basically limited to high-grade concrete and national key engineering projects

In addition, the prior art still has the problem that its excellent water-reducing performance cannot be fully reflected due to the large amount of water-reducing agent used.