Preparation method of triisopropanolamine modified early strength polycarboxylate superplasticizer

A technology of triisopropanolamine and triisopropanolamine acid ester is applied in the field of preparation of early-strength polycarboxylate water-reducing agent, and achieves the effects of promoting hydration, short reaction period and promoting early hydration

Inactive Publication Date: 2014-07-23
WUHAN UNIV OF TECH
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Problems solved by technology

[0007] All in all, there is no early-strength polycarboxylate superplasticizer with

Method used

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  • Preparation method of triisopropanolamine modified early strength polycarboxylate superplasticizer
  • Preparation method of triisopropanolamine modified early strength polycarboxylate superplasticizer

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Embodiment Construction

[0029] In order to further illustrate the content of the present invention, the following examples are specifically cited to describe the present invention in further detail. The examples are given by way of illustration, but in no way limit the content of the invention. The protection scope of the present invention shall be determined by the description of the claims.

[0030] Embodiment 1-8 proportioning ratio is as shown in Table 1, and its performance is as shown in Table 2, and concrete implementation process is as follows:

[0031] 1) Stir and dissolve TPEG-2400 macromonomer, triisopropanolamine maleate, and acrylic acid to obtain a uniform solution, then add an oxidant, and stir to obtain a uniform solution; the oxidant is a mixture of hydrogen peroxide and tert-butyl hydroperoxide Formed, the molar ratio is 1:1;

[0032] 2) Add reducing agent and chain transfer agent mixture to the homogeneous solution obtained in step 1), and continue to stir for 5.0 hours, add appr...

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Abstract

The invention relates to a preparation method of a triisopropanolamine modified early strength polycarboxylate superplasticizer. The preparation method comprises the following steps of (1) selecting raw materials; (2) dissolving polyester macromonomer, acrylic acid and maleic acid triisopropanolamine ester while stirring to obtain a uniform solution, then, adding an oxidizing agent, and stirring to obtain a uniform solution; (3) adding a reducing agent and chain transfer agent mixture into the uniform solution obtained in the step (2) at one step, continuing to stir, and adding a proper amount of deionized water to obtain the early strength polycarboxylate superplasticizer. The preparation method has the following main advantages that 1, the water reducing ratio is high, cement particles can be effectively dispersed, and the early stage hydration is promoted; 2, triisopropanolamine can be slowly released in an alkaline environment for cement hydration, so that the hydration is further promoted, the early strength is improved, but the initial flowability of slurry is not affected; 3, a one-step method and a one-step feeding way are adopted in the preparation method, and the preparation method is simple in process and short in reaction period.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a preparation method of an early-strength polycarboxylate water reducer modified by triisopropanolamine. Background technique [0002] The excellent properties of polycarboxylate superplasticizers, such as high water reducing rate and high slump retention, have been generally recognized by the industry, but for prefabricated construction projects, high early strength under low temperature conditions, traditional polycarboxylate superplasticizers have obvious problems performance defects. Usually, by introducing a strong adsorption group into the molecular structure, the molecules of the water reducing agent are quickly adsorbed on the surface of the cement particles, so that they are quickly consumed by the hydration products, thereby reducing the inhibitory effect of the water reducing agent on the formation of hydration products, which is not premature. Instead, r...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/22C08F2/38C08F4/40C07C219/08C07C213/06C04B24/32C04B103/30
Inventor 谭洪波戚长亚马保国汪杰代驻端
Owner WUHAN UNIV OF TECH
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