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Novel polycarboxylate water reducer, preparation method and application thereof

A technology of water reducer and polycarboxylate, applied in the field of new polycarboxylate water reducer, can solve the problems of low initial fluidity of polycarboxylate water reducer, inconvenient engineering construction, difficult to meet practical application, etc., and achieve low cost , Reduce the time loss, and the effect of simple steps

Active Publication Date: 2016-01-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polycarboxylate superplasticizers obtained by the above methods all have the problem of low initial fluidity, which brings great inconvenience to engineering construction and is difficult to meet the requirements of practical applications.

Method used

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  • Novel polycarboxylate water reducer, preparation method and application thereof
  • Novel polycarboxylate water reducer, preparation method and application thereof
  • Novel polycarboxylate water reducer, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 48g (0.02mol) polyalkoxyalkylene long-chain unsaturated monomer (BAPP, weight average molecular weight is 2400) is dissolved in the four-neck round bottom flask that 100g deionized water is housed; 4.32g (0.06mol) acrylic acid ( AA) was dissolved in 30g deionized water to form solution A; 0.236gL-ascorbic acid (Vc) and 0.5g sodium methacrylate (SMA) were dissolved in 24g deionized water to form solution B;

[0054] Nitrogen (N 2 ) for 30 minutes to remove oxygen, then heat up to 70°C, add 1.5g hydrogen peroxide (30% aqueous solution) into the reaction flask at one time, then add solution A and solution B dropwise, keep warm for 1 hour after the addition is completed, and add 0.08g trimethylol propane triacrylate (TMPTA), and then keep warm for 3 hours to obtain polycarboxylate superplasticizer (solution).

[0055] In order to determine its structure, the polycarboxylate water reducer synthesized in Example 1 of the present invention was tested by FTIR and dynamic light...

Embodiment 2

[0060] 48g polyalkoxyalkylene long-chain unsaturated monomer (BAPP, weight average molecular weight is 2400) is dissolved in the four necked round bottom flask that 100g deionized water is housed; 4.32g acrylic acid (AA) is dissolved in 30g deionized water Make solution A; 0.236gL-ascorbic acid (Vc) and 0.5g sodium methacrylate (SMA) are dissolved in 24g deionized water to make solution B;

[0061] Nitrogen (N 2 ) for 30 minutes to remove oxygen, then raise the temperature to 70°C, add 1.5g hydrogen peroxide (≥30% aqueous solution) into the reaction bottle at one time, then add solution A and solution B dropwise, keep warm for 1 hour after the addition is completed, and add 0.16g trihydroxy Methyl propane triacrylate (TMPTA), and then keep warm for 3 hours to obtain polycarboxylate superplasticizer (solution).

[0062] In order to determine its structure, FTIR, dynamic light scattering and other tests were carried out on the polycarboxylate water reducer synthesized in Exampl...

Embodiment 3

[0067] 48g polyalkoxyalkylene long-chain unsaturated monomer (BAPP, weight average molecular weight is 2400) is dissolved in the four necked round bottom flask that 100g deionized water is housed; 4.32g acrylic acid (AA) is dissolved in 30g deionized water Make solution A; 0.236gL-ascorbic acid (Vc) and 0.5g sodium methacrylate (SMA) are dissolved in 24g deionized water to make solution B;

[0068] Nitrogen (N 2 ) for 30 minutes to remove oxygen, then raise the temperature to 70°C, add 1.5g hydrogen peroxide (≥30% aqueous solution) into the reaction flask at one time, then add solution A and solution B dropwise, keep warm for 1 hour after the addition is completed, and add 0.24g trihydroxy Methyl propane triacrylate (TMPTA), and then keep warm for 3 hours to obtain polycarboxylate superplasticizer (solution).

[0069] In order to determine its structure, tests such as FTIR and dynamic light scattering were carried out on the polycarboxylate water reducer synthesized in Exampl...

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Abstract

The invention discloses a novel polycarboxylate water reducer which is prepared from following raw materials, by weight: 48 parts of a polyalkoxylvinyl long-chain unsaturated monomer, 2.88-10.08 parts of an unsaturated carboxylic acid, 0.2-2 parts of a chain transfer agent, 0.2-3 parts of an oxidizing agent, 0.1-1 part of a reducing agent, 154 parts of water and 0.08-0.24 parts of a micro-crosslinking agent. The polycarboxylate water reducer has high initial mortar fluidity and can hold a stable mortar fluidity for a long time, can effectively reduce time loss of slump degree and solves a problem of too fast loss of slump degree of usage of the concrete, and brings a great convenience to engineering construction in the fields of highway, bridge, dam, tunnels and high-rice buildings and the like. Meanwhile, the polycarboxylate water reducer is less in process, is simple in preparation step, is high in efficiency, is low in cost, is green and environment-friendly and is very suitable for industrial application.

Description

technical field [0001] The invention relates to a novel polycarboxylate water reducer and its preparation method and use. Background technique [0002] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete. [0003] Polycarboxylate (series) superplasticizer is a new type of high-performance concrete admixture, which has the advantages of low dosage, high water reducing rate, high slump performance, and environmental protection. It is widely used in roads, bridges, dams, Tunnels, high-rise buildings and other engineering fields. [0004] Generally, most polycarboxylic acid (series) water reducers have the problem of excessive slump loss. [0005] In order to solve the problem of excessive slump loss, those skilled in the art have adopted a variety of different methods, such as: combining polycarboxylic acid (system) water reducer with other additives (such as sodium gluconate, sodium citrate, etc.) ) compou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C08F283/06C08F4/40C04B103/30
Inventor 邹华维梁梅任芹玉
Owner SICHUAN UNIV
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