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A kind of polycarboxylate water reducing agent, preparation method and application thereof

A technology of water reducing agent and polycarboxylic acid, applied in the field of concrete admixtures, can solve the problems of influence of application effect, far from effect, unable to meet the requirements of raw material use, etc., and achieves small loss over time, good concrete workability, The effect of improving volume stability and durability

Inactive Publication Date: 2016-09-07
RIZHAO POLYTECHNIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's water reducer is still in the development stage. In the future, with the large-scale construction of urban infrastructure and the development of concrete to centralized mixing commercial concrete, many polycarboxylate water reducers will have different effects when applied to cement in different places. Very far, for different local cement and sandstone materials, different types of raw materials used in the synthesis of polycarboxylic acid will have a certain impact on its application effect, and the existing technology cannot meet the use requirements of some local raw materials

Method used

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  • A kind of polycarboxylate water reducing agent, preparation method and application thereof
  • A kind of polycarboxylate water reducing agent, preparation method and application thereof
  • A kind of polycarboxylate water reducing agent, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Weigh 370 kg of polyether macromonomer, put it into a mixing tank, add water until it is evenly stirred, and use the dissolved solution as a base material;

[0032] Step 2: Weigh 40 kg of acrylic acid small monomer, 0.8 kg of vitamin C, 0.95 kg of acetic acid, 6.5 kg of sodium methacrylate and 2.36 kg of ammonium persulfate and dissolve them in water, and add them dropwise to the stirring tank for 2 hours;

[0033] Step 3: Weigh 2 kg of hydrogen peroxide and directly add it to the stirring tank;

[0034] Step 4: High temperature 60 degrees, reaction time 4 hours;

[0035] Step five: finally adjust the pH to 6-7.

Embodiment 2

[0037] Step 1: Weigh 463 kg of polyether macromonomer, put it into a mixing tank, add water until it is evenly stirred, and use the dissolved solution as a base material;

[0038] Step 2: Weigh 50 kg of acrylic acid small monomer, 1 kg of vitamin C, 1.189 kg of acetic acid, 8.13 kg of sodium methacrylate and 2.95 kg of ammonium persulfate, dissolve them in water, and add them dropwise to the stirring tank for 2 hours;

[0039] Step 3: Weigh 2.5kg of hydrogen peroxide and directly add it to the stirring tank;

[0040] Step 4: High temperature 60 degrees, reaction time 4 hours;

[0041] Step five: finally adjust the pH to 6-7.

Embodiment 3

[0043] Step 1: Weigh 874 kg of polyether macromonomer, put it into a mixing tank, add water until it is evenly stirred, and use the dissolved solution as a base material;

[0044] Step 2: Weigh 94.5kg of acrylic acid small monomer, 1.89kg of vitamin C, 2.24kg of acetic acid, 15.36kg of sodium methacrylate and 5.57kg of ammonium persulfate, dissolve them in water, and add them dropwise to the stirring tank for 2 hours;

[0045] Step 3: Weigh 4.73kg of hydrogen peroxide and directly add it to the stirring tank;

[0046] Step 4: High temperature 60 degrees, reaction time 4 hours;

[0047] Step five: finally adjust the pH to 6-7.

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Abstract

The invention discloses a polycarboxylate water-reducer, a preparation method and its application. The raw materials of the water-reducer include polyether, acrylic acid, vitamin C, acetic acid, sodium methacrylate, ammonium persulfate, and hydrogen peroxide. This process is mainly through a series of intermolecular condensation or polyaddition reactions between polymer molecules through initiators, chain transfer agents, etc., mixing all materials under certain conditions and reacting, and finally adjusting the pH, and the use of this formula It is a water reducing agent only aimed at the characteristics of local materials. The product of the invention improves the applicability and application range of the admixture to local materials, has excellent effect and obvious cost advantage.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a polycarboxylate water reducer and a preparation method thereof, and also relates to the use of the water reducer. Background technique [0002] Concrete water reducer is an admixture used in concrete mixing and construction. Its function is to increase the fluidity of concrete and realize long-distance transportation and pipeline transportation of concrete. Water reducer is a must-use in the process of modern concrete construction. admixture. [0003] At present, concrete is needed in bridges, roads, subways and other projects. In order to meet the rapid development of other projects such as the construction industry, higher requirements are put forward for the performance of concrete. High-performance concrete and green concrete are the mainstream products of commercial concrete. Admixture is the third leap in concrete technology and an important technical way to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C04B24/26C04B28/04
Inventor 申淑荣徐锡权杨志刚赵春鹤魏义
Owner RIZHAO POLYTECHNIC
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