Polycarboxylate superplasticizer capable of effectively resisting influence of flocculating agent and preparation method of polycarboxylate superplasticizer

Abstract

The invention discloses a polycarboxylate superplasticizer capable of effectively resisting the influence of a flocculating agent and a preparation method of the polycarboxylate superplasticizer. The water reducing agent is prepared from the following components in parts by weight: 330 to 350 parts of unsaturated polyether macromonomer, 3 to 6 parts of alkaline stabilizer, 0.005 to 0.012 part of transition metal salt catalyst, 2.5 to 5.0 parts of oxidizing agent, 0.5 to 1.0 part of reducing agent, 1 to 3 parts of chain transfer agent, 15 to 20 parts of unsaturated carboxylic acid, 25 to 35 parts of methacryloyloxyethyl pyrrolidone monomer, 5 to 8 parts of fluoro functional monomer and 0.5 to 1.0 part of crosslinking slow-release monomer. 10-20 parts of a sodium hydroxide solution; and deionized water. The polycarboxylic acid water reducer can effectively solve the problems that when the residual amount of a flocculating agent in machine-made sand is high, the viscosity of a concrete material is increased, the flowability of the concrete is reduced, the slump loss of the concrete is accelerated, the mixing amount of the water reducer needs to be greatly increased or doubled, the strength of the concrete is reduced and the like in the existing water reducer.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to a polycarboxylate water reducer that can effectively resist the influence of flocculants and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is the most widely used concrete admixture at present. It has the advantages of low dosage, high water reducing rate, strong designability of molecular structure, good dispersibility, good slump retention performance, wide applicability, and production It is simple, green and pollution-free, and is widely used in the field of construction engineering. It is a research hotspot in the field of concrete admixtures at this stage. [0003] In recent years, with the rapid development of my country's economy, the amount of concrete has increased dramatically. Sand and gravel are the main raw materials in concrete. The excessive mining and consumption of natural sand has caused adverse effects on ...

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Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a polycarboxylate water reducer that can effectively resist the influence of flocculants and its preparation method. The polycarboxylate water reducer can effectively solve the existing problems of existing water reducers. When the residual amount of flocculant in the machine-made sand is high, the viscosity of the concrete material will increase, which will reduce the fluidity of the concrete and accelerate the loss of the slump of the concrete, and the amount of the water reducing agent needs to be increased a lot or doubled, and the concrete strength will be lowered, etc. question

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