Preparation method of novel high-dispersity and high-slump-retaining polycarboxylate superplasticizer

Abstract

The invention discloses a preparation method of a novel high-dispersity and high-slump-retaining polycarboxylate superplasticizer. The preparation method specifically comprises the following steps: step 1, preparing a base solution; step 2, preparing an additive; step 3, dropwise adding for reaction; and 4, adjusting the pH value. The invention relates to the technical field of concrete admixture synthesis. According to the preparation method of the novel high-dispersity and high-slump-retaining polycarboxylic acid water reducing agent, a third monomer vinyl diether is introduced, an original inherent molecular structure is changed, an uncharged short side chain is introduced to a polycarboxylic acid molecule, the distance of a long side chain is increased, and the slump-retaining property of the polycarboxylic acid water reducing agent is improved; the number of effective polycarboxylic acid molecules can be increased to a certain extent under the condition that the polymerization degree of the polycarboxylic acid molecules is not changed, initial water reduction and slump loss resistance can be improved at the same time, the technical direction of a C6 synthesis process is widened structurally, and the purpose of improving the upper limit of the performance of the polycarboxylic acid is achieved. The expected polycarboxylic acid structure effect can be achieved by directly adding the comonomer into the base material, and the production is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of concrete admixture synthesis, in particular to a preparation method of a novel polycarboxylate water reducer with high dispersibility and high slump retention. Background technique [0002] With the increasing demand for more cost-effective polycarboxylate superplasticizers in the market, there are many types of machine-made sand for concrete, and the quality of materials varies. Traditional polycarboxylate superplasticizers often have high water-reducing properties or low slump retention. The single characteristic of water reduction and high slump protection is difficult to adapt to the needs of various floor materials. Every time a floor material is changed, the mix ratio needs to be readjusted. The amount of experiment is large, and the cost of materials is difficult to control. come in very big trouble. [0003] Conventional polycarboxylate superplasticizers are copolymerized with acrylic acid and po...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a preparation method of a new polycarboxylate water reducer with high dispersion and high slump retention, which solves the problem that conventional polycarboxylate water reducers cannot simultaneously improve the initial water reducing rate and slump retention , when the water reducing rate is high, the slump retention will become worse, and the problem of prolonging the slump retention will inevitably sacrifice the initial water reducing rate

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