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A kind of early-strength polycarboxylate concrete water reducer and preparation method thereof

A technology of concrete water reducing agent and polycarboxylate, which is applied in the field of construction engineering materials, can solve the problems of increasing the amount of water reducing agent and increasing costs, and achieve the effects of accelerating construction progress, improving turnover rate, and good slurry flow performance

Active Publication Date: 2016-09-28
徐州巨龙新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above literatures all have problems such as producing early strength while sacrificing part of the water reducing performance, so it is necessary to increase the amount of water reducing agent used, resulting in increased costs.

Method used

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  • A kind of early-strength polycarboxylate concrete water reducer and preparation method thereof
  • A kind of early-strength polycarboxylate concrete water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 24g of isobutenol polyoxyethylene ether (2400) to the reaction vessel equipped with a stirrer, add 24g of distilled water, stir to dissolve it, wait for the temperature to rise to 65°C, and start to drop components 1 (6g of distilled water to dissolve in sequence) at the same time Acrylic acid 1.85g, sodium methacrylate sulfonate 0.45g, N-hydroxyethylacrylamide 0.35g) and component 2 (0.80g initiator ammonium persulfate dissolved in 6g distilled water); dropwise for 2h, keep warm for 3h, After the reactant is cooled to room temperature, adjust the pH value to 7-8 with monoethanolamine to obtain an early-strength polycarboxylate water reducer.

Embodiment 2

[0030] Add 24g of isobutenol polyoxyethylene ether (2400) to the reaction vessel equipped with a stirrer, add 24g of distilled water, stir to dissolve it, wait for the temperature to rise to 80°C, and start to drop components 1 (6g of distilled water to dissolve in sequence) at the same time Acrylic acid 2.5g, sodium methacrylate sulfonate 0.2g, acryloylmorpholine 0.3g) and component 2 (dissolve initiator potassium persulfate 1.66g in 6g distilled water); add dropwise for 2.5h, keep warm for 2h, and wait for reaction The mixture was cooled to room temperature, and the pH value was adjusted to between 6 and 7 with monoethanolamine to obtain an early-strength polycarboxylate superplasticizer.

Embodiment 3

[0032] Add 24g of isobutenol polyoxyethylene ether (2400) to the reaction vessel equipped with a stirrer, add 24g of distilled water, stir to dissolve it, wait for the temperature to rise to 80°C, and start to drop components 1 (6g of distilled water to dissolve in sequence) at the same time 3.25g of acrylic acid, 0.15g of sodium methacrylsulfonate, 0.20g of N-hydroxyethylacrylamide) and dropwise addition of component 2 (1.25g of initiator sodium persulfate dissolved in 6g of distilled water); dropwise for 3h, keep warm for 2h, After the reactant is cooled to room temperature, the pH value is adjusted to between 6 and 7 with diethanolamine to obtain an early-strength polycarboxylate water reducer.

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Abstract

An early-strength polycarboxylate concrete water-reducing agent and its preparation method, heating the macromonomer isobutenol polyoxyethylene ether and water to raise the temperature; Add dropwise the aqueous solution and initiator solution of acrylic acid, sodium methallyl sulfonate and amide group-containing early-strength monomer for 2-3h; Organic alkali neutralizes and adjusts the pH value to 7-8 to obtain an early-strength polycarboxylate concrete water-reducer; the early-strength polycarboxylate water-reducer of the present invention ensures good slurry flow performance On the basis, it can also significantly improve the early strength of concrete, and can be widely used in various concrete engineering constructions with early strength requirements, concrete construction in low temperature environments, especially suitable for low-energy production processes of concrete prefabricated components, and has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of construction engineering materials, in particular to an early-strength polycarboxylate concrete water reducer and a preparation method thereof. Background technique [0002] With the gradual expansion of the application range of concrete prefabricated components, it is not only widely used in intercity high-speed railways, cross-sea bridges, drainage projects and subsea tunnels, but also has broad application prospects in commercial housing. Therefore, the concrete members need high early strength and short setting time in order to speed up the construction progress and improve the formwork turnover rate. There are two main methods to realize the early strength function of polycarboxylate water reducer: one is to synthesize polymer itself with good early strength performance, and the other is to synthesize conventional polycarboxylate water reducer. With early strength components to achieve early strengt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F220/58C04B24/26C04B103/30
Inventor 张光华陈淼刘磊何志琴
Owner 徐州巨龙新材料科技有限公司