High-performance polycarboxylate superplasticizer and preparation method thereof

A polycarboxylic acid and water reducing agent technology, applied in the field of concrete admixtures, can solve the problems of cement-based materials such as retardation, difficulty in diffusion, and decline in mechanical properties, so as to increase the adsorption thickness, increase the contact area, and enhance the steric hindrance effect. Effect

Pending Publication Date: 2021-11-26
湖北恒利建材科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But due to nano-SiO 2 The particles have a large specific surface area and high surface energy, which makes it difficult to diffuse in the cement paste, and finally exists in the form of aggregates with a size of micron. The nanoscale effect cannot be fully exerted, and instead forms a weak zone in the hardened cement matrix. Lead to a decrease in mechanical properties; there is also the use of nano-SiO 2 The method of physical blending with polycarboxylate superplasticizer to achieve the purpose of dispersion, but this makes the dosage of polycarboxylate superplasticizer much higher than the saturated dosage required by cement paste, which easily leads to cement-based The material is severely retarded

Method used

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  • High-performance polycarboxylate superplasticizer and preparation method thereof
  • High-performance polycarboxylate superplasticizer and preparation method thereof

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Effect test

Embodiment 1

[0033] S1: Activation of the macromolecular monomer: add a small amount of hydrogen peroxide solution dropwise to the terminal alkenyl alkylene polyoxyethylene ether for activation treatment.

[0034] S2: Add the aqueous solution of terminal alkenyl alkylene polyoxyethylene ether and the aqueous solution of maleic anhydride activated in step S1 into the reactor, the maleic anhydride, terminal alkenyl alkylene polyoxyethylene ether, The feed weight ratio of water is 2:10:50;

[0035] S3: slowly drop an aqueous solution of ascorbic acid, hydrogen peroxide, and sodium bisulfite into the reactor, and the weight ratio of the hydrogen peroxide, ammonium persulfate, and sodium bisulfite is 1:0.6;

[0036] S4: Slowly add the aqueous solution of methacrylic acid, mercaptopropionic acid and 2-acrylamido-2-methylpropylsulfonic acid into the reactor dropwise, and the dropwise addition is completed in 3 hours; use sodium hydroxide for 2 hours at room temperature Adjust the pH value of the...

Embodiment 2

[0038] S1: Activation of the macromolecular monomer: add a small amount of hydrogen peroxide solution dropwise to the terminal alkenyl alkylene polyoxyethylene ether for activation treatment.

[0039] S2: Add the aqueous solution of terminal alkenyl alkylene polyoxyethylene ether and the aqueous solution of maleic anhydride activated in step S1 into the reactor, the maleic anhydride, terminal alkenyl alkylene polyoxyethylene ether, The feed weight ratio of water is 2:10:50;

[0040] S3: slowly drop an aqueous solution of ascorbic acid, hydrogen peroxide, and sodium bisulfite into the reactor, and the weight ratio of the hydrogen peroxide, ammonium persulfate, and sodium bisulfite is 1:0.6;

[0041] S4: Slowly add the aqueous solution of methacrylic acid, maleic acid-triethanolamine monoester, mercaptopropionic acid and 2-acrylamido-2-methylpropylsulfonic acid into the reactor dropwise, and the dropwise addition is completed in 3 hours Reaction at normal temperature for 2 hour...

Embodiment 3

[0043] S1: Activation of the macromolecular monomer: add a small amount of hydrogen peroxide solution dropwise to the terminal alkenyl alkylene polyoxyethylene ether for activation treatment.

[0044] S2: Add the aqueous solution of terminal alkenyl alkylene polyoxyethylene ether and the aqueous solution of maleic anhydride activated in step S1 into the reactor, the maleic anhydride, terminal alkenyl alkylene polyoxyethylene ether, The feed weight ratio of water is 2:10:50;

[0045] S3: slowly drop an aqueous solution of ascorbic acid, hydrogen peroxide, and sodium bisulfite into the reactor, and the weight ratio of the hydrogen peroxide, ammonium persulfate, and sodium bisulfite is 1:0.6;

[0046] S4: methacrylic acid, nano-SiO 2 The aqueous solution of mercaptopropionic acid and 2-acrylamido-2-methylpropylsulfonic acid is slowly added dropwise to the reactor, and the dropwise addition is completed in 3 hours; the pH value of the reaction solution is adjusted by using sodium...

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Abstract

The invention belongs to the technical field of concrete admixtures, and particularly relates to a high-performance polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the steps that firstly, in the polymerization process of maleic acid-triethanolamine monoester in alkenyl-terminated polyoxyethylene ether and acrylic acid, the polycarboxylate superplasticizer with the early strength effect is formed; meanwhile, a small amount of nano silicon dioxide is added in the polymerization process, the nano silicon dioxide is grafted into the polycarboxylic acid water reducing agent with the early strength effect through free radical polymerization, then the nano silicon dioxide and the hyperbranched polymer are modified to change the long-chain molecular structure and improve the molecular space volume; as the end of the hyperbranched polymer has a Y-shaped structure, the formed polycarboxylate superplasticizer with the multi-branched Y-shaped structure can increase steric hindrance between side chains of polycarboxylic acid, so that the tail ends of the side chains are in an extended state, and the adsorption thickness and the dispersion performance of the superplasticizer on cement particles are improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a high-performance polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete. Most of them are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. After being added to the concrete mixture, it can disperse the cement particles, improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement. [0003] The steric hindrance effect is mainly determined by the thickness of the adsorption layer of polycarboxylic acid on the surface of cement particles. The conformation of the side chain of polycarboxylic acid in cement is mainly affected by the steric hindrance between the side chains...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F283/00C08F220/06C08F222/06C08F222/22C04B24/26C04B103/30
Inventor 黄文明王国亮刘军魏运超
Owner 湖北恒利建材科技有限公司
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