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A kind of concrete viscosity reducer and preparation method thereof

A technology for concrete and viscosity reducing agent, applied in the field of chemical building materials, can solve the problems such as difficulty in obtaining the raw materials of large monomers, complicated preparation process of admixtures, complicated purification process, etc., to achieve easy mass production, improve pumping construction performance, Simple production process

Active Publication Date: 2018-06-05
中建西部建设新材料科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, there are problems such as high reaction temperature, complex purification process, and high production cost in the preparation of methoxy polyethylene glycol methacrylate macromonomer
In recent years, Germany's BASF and Switzerland's Sika have launched admixture products with a viscosity-reducing effect, which have been used in the preparation of high-grade concrete, but their admixtures have complex preparation processes, difficult to obtain large monomer raw materials, and high costs. question

Method used

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  • A kind of concrete viscosity reducer and preparation method thereof
  • A kind of concrete viscosity reducer and preparation method thereof
  • A kind of concrete viscosity reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A concrete viscosity reducer, the monomers involved are 4-hydroxybutyl vinyl ether, acrylamide and methacrylic acid-β-hydroxyethyl phosphate, and its material ratio is 1:0.5:0.01. Its preparation The method includes the following steps:

[0034] (1) Add 46.4g of 4-hydroxybutyl vinyl ether, 14.2g of acrylamide, 0.84g of β-hydroxyethyl methacrylate phosphate, and 552.96g of deionized water into a 1L four-necked flask, and stir evenly; Nitrogen gas was introduced into the flask to replace the air in the flask. After the monomers were completely dissolved, 0.61 g of sodium methacrylate and 0.92 g of ammonium persulfate were added, and stirred evenly;

[0035] (2) Adding 60 g of sodium sulfite solution with a mass fraction of 0.1% dropwise in the solution obtained in step (1), controlling the water bath at 30° C., the dropwise addition time is 2 h, and the dropwise addition is completed and incubated for 1 h; after the reaction is completed, add 30 wt % sodium hydroxide The...

Embodiment 2

[0038] A concrete viscosity reducer, the monomers involved are 4-hydroxybutyl vinyl ether, methacrylamide and acrylate-beta-hydroxyethyl phosphate, and its material ratio is 1:1:0.02. Its preparation The method includes the following steps:

[0039] (1) Add 46.4g of 4-hydroxybutyl vinyl ether, 33.95g of methacrylamide, 1.57g of β-hydroxyethyl acrylate phosphate, and 464.2g of deionized water into a 1L four-necked flask, and stir evenly; Nitrogen gas was introduced into the flask to replace the air in the flask. After the monomers were completely dissolved, 0.82 g of sodium methacrylate, 0.41 g of sodium allyl sulfonate, and 1.23 g of potassium persulfate were added, and stirred evenly;

[0040] (2) Add 41 g of sodium sulfite solution with a mass fraction of 0.1% dropwise to the solution obtained in step (1), control the water bath at 40° C., the drop time is 2.5 h, and keep the temperature for 1 h after the addition is completed; The sodium aqueous solution adjusts the pH to ...

Embodiment 3

[0043] A concrete viscosity reducer, the monomers involved are 4-hydroxybutyl vinyl ether, acrylamide, N-isopropylacrylamide and hydroxypropyl acrylate phosphate, and the molar ratio of the substances is 1:1:1 :0.03, its preparation method comprises the following steps:

[0044](1) Add 30g of 4-hydroxybutyl vinyl ether, 18.34g of acrylamide, 29.23g of N-isopropylacrylamide, 1.63g of hydroxypropyl acrylate phosphate, and 316.8g of deionized water into a 1L four-necked flask. Stir evenly; introduce nitrogen into the flask to replace the air in the bottle, after the monomers are completely dissolved, add 1.58g of sodium 2-acrylamido-2-methylpropenesulfonate, 0.40g of hydrogen peroxide, and stir evenly;

[0045] (2) Adding 40 g of L-ascorbic acid solution with a mass fraction of 0.2% in the solution obtained in step (1), controlling the water bath at 50° C., the time for adding is 3 hours, and the addition is completed and kept for 1 hour; after the reaction is completed, add 30 w...

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Abstract

The invention discloses a concrete viscosity reducer and a preparation method thereof. The viscosity reducer is prepared from raw materials including 1,4-butanediol vinyl ether, unsaturated amide and unsaturated phosphate ester through polymerization. The production process of the prepared concrete viscosity reducer is simple, the concrete viscosity reducer has good adaptability with a polycarboxylate water reducer, the concrete viscosity reducer in the mass 0.01%-0.03% that of gel materials is mixed with concrete, the workability of the concrete can be remarkably improved, and the problems that the concrete viscosity is high and concrete is difficult to pump at a low water-gel ratio are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of chemical building materials, and relates to a concrete viscosity reducer and a preparation method thereof. Background technique [0002] In recent years, with the development of large-scale and high-rise building structures in my country, the requirements for concrete strength are getting higher and higher. In order to improve the strength of concrete, high-strength cement is generally used, the amount of cementitious materials is increased, and the water-binder ratio is reduced. However, these measures often lead to increased concrete viscosity and slower flow rate, which is not conducive to pumping and construction. In addition, due to the shortage of river sand resources, a large amount of machine-made sand is also used in the preparation of the above-mentioned concrete. The machine-made sand has many edges and corners and poor gradation, which makes the viscosity problem more prominent. [0003] In o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F216/14C08F220/56C08F220/54C08F220/58C08F230/02C08F228/02C08F212/14C04B24/16
CPCC04B24/163C08F216/1416C08F220/56C08F230/02C08F228/02C08F220/54C08F220/58C08F212/14C08F222/385
Inventor 刘明郑广军高育欣陈景傅承飞李东来吕锐王少峰
Owner 中建西部建设新材料科技有限公司
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