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Viscosity reduction type water reducing agent and preparation method thereof

A water-reducing agent and viscosity-reducing technology, which is applied in the field of building materials, can solve the problems of fresh concrete bleeding, prolonging the form removal cycle, and increasing costs, and achieve a significant effect of reducing viscosity, reducing energy consumption, and reducing HLB values. Effect

Pending Publication Date: 2020-08-28
CHONGQING SANSHENG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adopting this method of viscosity reduction will lead to cost increase on the first aspect, excessive retarding effect on the second aspect, prolonging the form removal cycle, and problems such as bleeding and stripping of freshly mixed concrete on the third aspect, which will cause certain difficulties in construction

Method used

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  • Viscosity reduction type water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Dissolve 27g of acrylic acid and 30g of hydrogen phosphate bis(methacryloyloxyethyl) in 40g of deionized water, stir evenly to obtain a monomer solution for use; dissolve 2g of mercaptopropionic acid and 1.06g of sodium formaldehyde sulfoxylate In 59.2 g of deionized water, stir evenly to obtain a chain transfer agent solution for use; 200 g of methyl alkenyl polyoxyethylene ether with a polymerization degree of 54 and a molecular weight of 2400, 150 g of a polyoxyethylene polyoxyethylene ether with a polymerization degree of 56 and a molecular weight of 2400 Put butyl vinyl polyglycol ether and 120g deionized water into the reaction vessel and heat to dissolve. After the complete dissolution and the temperature reaches 20°C, add the mixed solution of 2.67g hydrogen peroxide and 0.27g ferrous sulfate and keep stirring for 5min, then Add 14g of acrylic acid, and after 5 minutes, start to add the monomer solution and chain transfer agent solution dropwise at a constant spe...

Embodiment 2

[0042]Dissolve 35g of acrylic acid and 20g of methacryloyloxyethyl phosphate in 42g of deionized water, stir well to obtain a monomer solution for use; dissolve 1g of mercaptopropionic acid and 2.66g of sodium formaldehyde sulfoxylate in 60g of deionized In water, stir evenly to obtain a chain transfer agent solution for use; 200g of ethoxy vinyl polyglycol ether with a degree of polymerization of 60 and a molecular weight of 3000 and 160g of isobutylene alcohol polyoxyethylene with a degree of polymerization of 60 and a molecular weight of 3000 Add ether and 120g deionized water into the reaction vessel and heat to dissolve. After the solution is completely dissolved and the temperature reaches 25°C, add a mixed solution of 2.66g hydrogen peroxide and 0.26g ferrous sulfate and keep stirring for 3 minutes. Add the monomer solution and the chain transfer agent solution dropwise for 0.45 hours, then continue the heat preservation reaction for 1.5 hours. After the reaction, add aq...

Embodiment 3

[0044] Dissolve 20g of acrylic acid, 12g of hydrogen phosphate bis(methacryloyloxyethyl) phosphate, and 12g of methacryloyloxyethyl phosphate in 350g of deionized water, and stir evenly to obtain a monomer solution for use; Acid and 3.2g sodium formaldehyde sulfoxylate, 0.8g ferrous sulfate are dissolved in 50g deionized water, stir evenly, get the chain transfer agent solution stand-by; 220g polymerization degree is 34, the molecular weight is 2000 hydroxybutyl vinyl Polyethylene glycol ether and 230g of polyglycol ether with a degree of polymerization of 60 and a molecular weight of 3000 and 100g of deionized water were put into a reaction vessel and heated to dissolve. After the solution was completely dissolved and the temperature reached 20°C, 4g of hydrogen peroxide was added. The solution was kept and stirred for 6 minutes, then 12 g of acrylic acid was added, and after 5 minutes, the monomer solution and the chain transfer agent solution were added dropwise at a constan...

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Abstract

A viscosity reduction type water reducing agent is prepared from, by weight, 25-45 parts of a monomer A, 3-5 parts of a monomer B, 2-4 parts of a monomer C, 0.1-0.3 part of a chain transfer agent, 0.4-1 part of an initiator and 50-60 parts of water. The monomer A is any one or more of methyl allyl polyoxyethylene ether, isobutene alcohol polyoxyethylene ether, hydroxybutyl vinyl polyethylene glycol ether, ethoxy vinyl polyethylene glycol ether and allyl polyethylene glycol ether; the monomer B is any one or more of acrylic acid, maleic acid and itaconic acid; the monomer C is any one or more of methacryloyloxyethyl phosphate, di(methacryloyloxyethyl) hydrogen phosphate and hydroxyethyl methacrylate; the initiator is a composition of an oxidation component and a reduction component; and thechain transfer agent is any one or more of mercaptopropionic acid, mercaptoacetic acid and mercaptoethanol. The water reducing agent releases free water to the maximum extent by reducing combinationwith water, increases the water-binder ratio, and is remarkable in viscosity reducing effect and wide in adaptability.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a viscosity-reducing water reducer and a preparation method thereof. Background technique [0002] With the rapid development of the construction industry, modern buildings tend to be more and more high-rise, lightweight and long-span. High-strength grade concrete is more and more widely used in National infrastructure is under construction. In order to make concrete reach high-strength or ultra-high-strength grades, a large amount of cementitious materials and a low water-to-binder ratio must be used, which leads to the problems of high viscosity and slow flow of freshly mixed concrete, making construction difficult, especially for ultra-high-strength concrete. The problem of high viscosity of concrete is particularly serious in pumping construction in my country, which leads to frequent engineering accidents. [0003] At present, the methods for reducing the viscosity of high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F230/02C08F4/40C08F2/38C04B24/26C04B103/30
CPCC08F283/065C08F4/40C08F2/38C04B24/246C04B2103/302C08F220/06C08F230/02
Inventor 汪瑞悦潘呈恭李良滢高毅姚彬
Owner CHONGQING SANSHENG IND CO LTD
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