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Preparation method of viscosity reduction type polycarboxylate superplasticizer

A technology of viscous polycarboxylic acid and water reducing agent is applied in the field of preparation of viscosity reducing polycarboxylate water reducing agent. , the effect of reducing the thickness and reducing the surface tension of the liquid phase

Pending Publication Date: 2022-07-26
WUHAN YUANJIN BUILDING MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies in the prior art above, one of the purposes of the present invention is to provide a method for preparing a viscosity-reducing polycarboxylate water-reducer. The prepared polycarboxylate water-reducer has an excellent viscosity-reducing effect and can reduce the viscosity of concrete. Plastic viscosity, solving the problems of high-strength concrete with high viscosity, slow flow rate and difficult pumping

Method used

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  • Preparation method of viscosity reduction type polycarboxylate superplasticizer

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Embodiment 1

[0028] The present embodiment provides a preparation method of a viscosity-reducing polycarboxylate water-reducing agent, comprising the following steps:

[0029] S1. Add 200g of water to the four-necked flask, then add 240g of ethylene glycol monovinyl polyglycol ether (molecular weight 2400), 14g of vinyl trifluoroacetate and 1.2g of sp-80, fully dissolve to form an aqueous system ; Dissolve 1.2g vitamin C and 2.4g mercaptopropionic acid in 30g water to obtain liquid A; dissolve 21.6g acrylic acid and 15.5g cetyl methacrylate in 30g water to obtain liquid B;

[0030] S2. Add 4.8g TiO2 to the four-necked flask, then put it into the photoreactor, turn on the high-pressure mercury lamp after 30 minutes to irradiate it and time it, and irradiate it for 2-4h; Add solution A and solution B dropwise, wherein the dropwise addition time of solution A is 5h, and the dropwise addition time of solution B is 4h; after the dropwise addition, the reaction is incubated at 60-80°C for 10h, a...

Embodiment 2

[0033] The present embodiment provides a preparation method of a viscosity-reducing polycarboxylate water-reducing agent, comprising the following steps:

[0034] S1. Add 200g of water to the four-necked flask, then add 240g of ethylene glycol monovinyl polyglycol ether, 14g of vinyl trifluoroacetate and 2.4g of op-10, fully dissolve to form an aqueous system; add 2.4g of The hanging white block and 2.4g of mercaptoethanol were dissolved in 30g of water to obtain liquid A; 58g of hydroxyethyl acrylate and 14.2g of n-butyl methacrylate were dissolved in 30g of water to obtain liquid B;

[0035] S2. Add 7.2g TiO2 to the four-necked flask, then put it into the photoreactor, turn on the high-pressure mercury lamp after 30min to irradiate it and time it, and irradiate it for 2-4h; while irradiating, drop it into the reactor at the same time Add liquid A and liquid B, wherein the dropping time of liquid A is 5 h, and the dropping time of liquid B is 4 h; after the dropping is comple...

Embodiment 3

[0038] The present embodiment provides a preparation method of a viscosity-reducing polycarboxylate water-reducing agent, comprising the following steps:

[0039]S1. Add 200g of water to the four-necked flask, then add 240g of ethylene glycol monovinyl polyglycol ether, 28g of vinyl trifluoroacetate and 0.24g of sp-80, fully dissolve to form an aqueous system; add 0.24g of Vitamin C and 0.24g of mercaptopropionic acid were dissolved in 30g of water to obtain solution A; 8.6g of methacrylic acid and 3.38g of octadecyl methacrylate were dissolved in 30g of water to obtain solution B;

[0040] S2. Add 1.2g TiO2 to the four-necked flask, then put it into the photoreactor, turn on the high-pressure mercury lamp after 30min to irradiate it and time it, and irradiate it for 2-4h; drop it into the reactor at the same time while irradiating Add liquid A and liquid B, wherein the dropping time of liquid A is 5 h, and the dropping time of liquid B is 4 h; after the dropping is completed,...

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Abstract

The invention discloses a preparation method of a viscosity reduction type polycarboxylic acid water reducing agent, and belongs to the technical field of building material concrete water reducing agents. The invention relates to a preparation method of a viscosity reduction type polycarboxylic acid water reducer. The preparation method comprises the following steps: S1, dissolving a polyether monomer, trifluorovinyl acetate and an emulsifier in water to form a homogeneous system; dissolving a reducing agent and a chain transfer agent in water to obtain a solution A; dissolving a carboxyl small monomer and alkyl methacrylate in water to obtain a solution B; s2, adding a catalyst into the homogeneous system, then putting the homogeneous system into a photoreactor, turning on a high-pressure mercury lamp, then dropwise adding the solution A and the solution B into the homogeneous system at the same time, carrying out a heat preservation reaction after dropwise adding is completed, and finally adjusting the pH to be neutral, so as to obtain the viscosity reduction type polycarboxylate superplasticizer. The prepared polycarboxylate superplasticizer has an excellent viscosity reduction effect, can remarkably reduce the viscosity of concrete, and is beneficial to pumping construction of the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete water-reducing agents for building materials, and particularly relates to a preparation method of a viscosity-reducing polycarboxylate water-reducing agent. Background technique [0002] In recent years, my country's high-speed rail, subway, tunnels and bridges and other infrastructure have developed rapidly, resulting in an increasing demand for concrete, and at the same time promoting the development of water reducing agents in my country. Due to the advantages of high water reduction, low output, safety and environmental protection, the use of polycarboxylate superplasticizers in infrastructure has shown an increasing trend year by year since its development, and its usage accounts for more than 70% of the total admixtures. High-strength concrete is used in complex buildings such as super high-rises and large bridges due to its strong bearing capacity, small component size and good durability....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F218/04C08F220/06C08F220/18C08F2/48C04B24/26C04B103/30
CPCC08F283/065C08F2/48C04B24/2694C04B2103/302C08F218/04C08F220/06C08F220/1818
Inventor 汪苏平汪源李伟鹏胡志豪潘阳高慧敏
Owner WUHAN YUANJIN BUILDING MATERIALS TECH CO LTD
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