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Low-sensitivity polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylate and water reducing agent, applied in the field of concrete admixtures, can solve the problems of cumbersome, difficult concrete construction requirements, concrete can not be opened, etc., and achieve the effect of simple use

Inactive Publication Date: 2017-12-08
CHONGQING SANSHENG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing polycarboxylate superplasticizer is very sensitive to the dosage. If the dosage is low, the concrete will not be opened and the loss will be too large; if the dosage is too high, it will cause bleeding and segregation of the concrete, which will affect the strength.
[0004] Existing polycarboxylate superplasticizers are either high in water reduction or high in slump retention, and it is difficult to take into account the construction requirements of concrete on site. In the prior art, the compounding of water reducing agents is often used to keep the concrete in balance, which is cumbersome and serious. It affects the popularization, application and performance of polycarboxylate superplasticizer

Method used

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  • Low-sensitivity polycarboxylate superplasticizer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve two-thirds of the mass of monomer B, monomer C and monomer D in deionized water, and stir evenly to obtain a small monomer solution for use;

[0025] S2. Dissolve the Vc in the chain transfer agent and the initiator in deionized water, stir evenly, and obtain the chain transfer agent solution for use;

[0026] S3. Prepare ammonium persulfate, Vc, calcium lignosulfonate, and deionized water for use, and the amount of ammonium persulfate, Vc, calcium lignosulfonate, and deionized water is a mass ratio of 3:0.2:75; Mix and stir sodium lignosulfonate, ferrous sulfate and water evenly, control the temperature rise to 100°C, add Vc, keep stirring for 2 hours, and obtain modified calcium lignosulfonate;

[0027] S4. Put the monomer A and deionized water into the reaction container and heat to dissolve. When the monomer A is completely dissolved and the temperature reaches 35°C, add the remaining one-third of the mass of the monomer B, and then add the peroxide in the ...

Embodiment 2

[0033] Dissolve two-thirds of the mass of monomer B, monomer C and monomer D in deionized water, and stir evenly to obtain a small monomer solution for use;

[0034] S2. Dissolve the Vc in the chain transfer agent and the initiator in deionized water, stir evenly, and obtain the chain transfer agent solution for use;

[0035] S3. Prepare ammonium persulfate, Vc, calcium lignosulfonate, and deionized water for use, and the amount of ammonium persulfate, Vc, calcium lignosulfonate, and deionized water is a mass ratio of 1:0.31:85; Mix and stir sodium lignosulfonate, ferrous sulfate and water evenly, control the temperature rise to 80°C, add Vc, keep warm and stir for 2 hours to obtain modified calcium lignosulfonate;

[0036] S4. Put the monomer A and deionized water into the reaction container and heat to dissolve. When the monomer A is completely dissolved and the temperature reaches 35°C, add the remaining one-third of the mass of the monomer B, and then add the peroxide in t...

Embodiment 3

[0042] Dissolve two-thirds of the mass of monomer B, monomer C and monomer D in deionized water, and stir evenly to obtain a small monomer solution for use;

[0043] S2. Dissolve the Vc in the chain transfer agent and the initiator in deionized water, stir evenly, and obtain the chain transfer agent solution for use;

[0044] S3. Prepare ammonium persulfate, Vc, calcium lignosulfonate, and deionized water for use, and the amount of ammonium persulfate, Vc, calcium lignosulfonate, and deionized water is a mass ratio of 2:0.3:75; Mix and stir sodium lignosulfonate, ferrous sulfate and water evenly, control the temperature rise to 80-110°C, add Vc, keep warm and stir for 2 hours to obtain modified calcium lignosulfonate;

[0045] S4. Put the monomer A and deionized water into the reaction container and heat to dissolve. When the monomer A is completely dissolved and the temperature reaches 35°C, add the remaining one-third of the mass of the monomer B, and then add the peroxide i...

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Abstract

The invention discloses a low-sensitivity polycarboxylate superplasticizer and a preparation method thereof. The low-sensitivity polycarboxylate superplasticizer provided by the invention comprises isopentene-based polyethylene glycol, acrylic acid or acrylate, 2-acrylamido-2-methylpropane sulfonic acid, hydroxyethyl acrylate, a chain transfer agent, an initiator, modified calcium lignosulphonate and water. The components are prepared into the product according to a chain reaction method. The low-sensitivity polycarboxylate superplasticizer provided by the invention is wide in doping amount range, the two characteristics of concrete, such as water reducing and slump retaining, can be taken into account when the low-sensitivity polycarboxylate superplasticizer serves as an admixture of the concrete, and the low-sensitivity polycarboxylate superplasticizer is easy to use.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a low-sensitivity polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is a high-performance superplasticizer and a cement dispersant used in cement concrete. Widely used in highways, bridges, dams, tunnels, high-rise buildings and other projects. [0003] However, the existing polycarboxylate superplasticizer is very sensitive to the dosage. If the dosage is low, the concrete will not be opened and the loss will be too large; if the dosage is too high, it will cause bleeding and segregation of the concrete, which will affect the strength. [0004] Existing polycarboxylate superplasticizers are either high in water reduction or high in slump retention, and it is difficult to take into account the construction requirements of concrete on site. In the prior art, the compounding of water reducing agents is often used t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B28/02C08F283/06C08F220/06C08F220/28C08F2/26C08F2/38C04B103/30
CPCC04B24/165C04B28/02C04B2103/302C08F2/26C08F2/38C08F283/065C08F220/06C04B14/02C04B14/06
Inventor 潘先文陈云松姚彬
Owner CHONGQING SANSHENG IND CO LTD