Early strength type ether polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention discloses an early strength type ether polycarboxylate superplasticizer and a preparation method thereof, and relates to the technical field of building materials. The superplasticizer is prepared from the following raw materials in parts by weight: 20-30 parts of an isopentenol polyethylene glycol monomethyl ether macromonomer with a polymerization degree of 27, 50-60 parts of an isopentenol polyethylene glycol monomethyl ether macromonomer with a polymerization degree of 113, 6.5-8.6 parts of acrylic acid or a derivative monomer thereof, 0.3-1.5 parts of a chain transfer agent, 0.4-0.6 part of an initiator, 2.5-3.5 parts of 2-acrylamido-2-methyl-1-propane sulfonic acid and 125-135 parts of deionized water. The early strength type ether polycarboxylate superplasticizer disclosed by the invention has the beneficial effects of small doping amount, remarkable early strength effect, high water reduction rate, small slump loss, environmental protection, smaller molecular weight distribution and higher free radical polymerization conversion rate, and the early strength of concrete prepared by a synthetic sample of the early strength type ether polycarboxylate superplasticizer disclosed by the invention is better than that of the concrete using a common superplasticizer.

Description

Technical field: [0001] The invention relates to the technical field of building materials, in particular to a polycarboxylate water reducer with early strength function and a preparation method thereof. Background technique: [0002] In recent years, with the rapid development of high-performance concrete, the research on concrete admixtures has been unprecedentedly active. Ordinary polycarboxylate superplasticizers will delay cement hydration, especially under low temperature conditions, and the early strength development is slow, which limits the use of ordinary polycarboxylate superplasticizers. In prefabricated components and emergency repair projects, etc., in order to increase production efficiency and speed up construction progress, polycarboxylate superplasticizers are not only required to have a good water-reducing and dispersing effect, but also to be able to improve the early strength of concrete. [0003] At present, the commonly used method of early-strength p...

AI Technical Summary

Problems solved by technology

In actual production, ester monomers can only be produced through high-temperature esterification. At the same time, water-carrying agents must be used, water separation devices and reflux devices, and vacuum distillation to remove solvents. This requires high equipment requirements and high processing costs. And the water-carrying agent itself has considerable toxicity, which is not conducive to environmental protection

The operation of esterification reaction is complex and the reaction process is difficult to control

This makes the whole production process time-consuming, and the polymerization inhibitor added in the esterification reaction has a certain influence on the later copolymerization reaction

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