Polycarboxylate superplasticizer as well as preparation method and application thereof

Abstract

The invention discloses a polycarboxylate superplasticizer as well as a preparation method and application thereof. The polycarboxylate superplasticizer is prepared from the following raw materials: a polymeric monomer, a chain transfer agent, a reducing agent and an oxidizing agent, wherein the polymeric monomer is composed of unsaturated polyoxyethylene ether and unsaturated acid, and the mass ratio of the unsaturated polyoxyethylene ether to the unsaturated acid is (34-38): (3.0-3.5), the reducing agent comprises ferrite and a cyclic surfactant sodium diethylhexyl sulfosuccinate (E51). The raw materials used in the preparation of the water reducing agent are few in variety and lower in cost. According to the preparation method, the raw materials do not need to be dissolved, preheated or cooled in advance, the polycarboxylate superplasticizer can be efficiently synthesized within a short time at the normal temperature, temperature control is not needed in the whole preparation process, the reaction is carried out at the normal temperature (without a heat source), the optimal conversion rate and polymerization degree can be achieved, energy is saved, meanwhile, operation is simpler, and consumed time is shorter.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a polycarboxylate water reducer and its preparation method and application. Background technique [0002] With the rapid development of the construction industry, water reducing agents have become an indispensable component in concrete, and are the strongest development trend of concrete admixtures. Under the condition that the initial state of concrete and the amount of cement remain unchanged, adding water reducing agent when mixing concrete can reduce water demand and improve concrete performance. Traditional water reducers include lignosulfonate admixtures, naphthalene sulfonate formaldehyde condensation products, melamine formaldehyde condensation products, acetone sulfonate formaldehyde condensation products and sulfamate formaldehyde condensation products, etc. In the early 1980s, Japan took the lead in successfully developing a new generation of water reducer...

AI Technical Summary

Problems solved by technology

[0004] However, the polycarboxylate superplasticizer production synthesis process in the related art not only has defects such as long time-consuming (mostly consuming more than 4 hours), but also has complex process operations (such as the need to dissolve materials in advance, etc.), high energy consumption (if needed Heating or cooling treatment, etc.) and other deficiencies greatly increase labor costs

This kind of production synthesis process will not only cause waste of time and resources, but also seriously affect the efficiency of industrial production

Slight fluctuations in temperature in some production and synthesis processes may lead to poor use of the produced polycarboxylate superplasticizer

Especially at the present stage, the mining of river sand and pebbles is prohibited, and the construction industry basically can only use machine-made sand and gravel materials. Polycarboxylate superplasticizers are not adaptable enough to poor ground materials, which greatly restricts their application.

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