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High-slump-resistance polycarboxylate water reducer

A technology of polycarboxylic acid and water reducer, which is applied in the field of concrete additives, can solve the problems of not being able to meet the needs of concrete super-long working performance, and achieve good adaptability

Inactive Publication Date: 2019-05-10
CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for projects with long distances or long transportation times, relying solely on the slump retention performance of this type of polycarboxylate superplasticizer can no longer meet the needs of special projects for super-long working performance of concrete

Method used

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  • High-slump-resistance polycarboxylate water reducer

Examples

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Embodiment 1

[0026] This embodiment provides a high slump retention polycarboxylate water reducer, which is composed of the following mass percentages: polycarboxylate slump retention mother liquor 10-25%, polycarboxylate water reducing mother liquor 28-35%, retarding component 4%, the balance is water.

[0027] The high slump retention polycarboxylate superplasticizer compounded with the polycarboxylate slump retention mother liquor provided by the present invention has low dosage, high water reduction, and high slump retention, and the slump retention time can be flexibly adjusted according to the transportation distance and time of engineering concrete. , The concrete slump retention time can be extended from 1 hour to 4 hours, and it has good adaptability to cement.

Embodiment 2

[0029] On the basis of Example 1, this embodiment provides a high slump retention polycarboxylate water reducer, the preparation process of the polycarboxylate retention mother liquor includes the following steps:

[0030] Step 1) Add unsaturated polyoxyethylene ether monomer and water into the reaction kettle, stir to dissolve and heat up to 20°C, and add chain transfer agent and initiator, wherein the mass of water accounts for the mass of unsaturated polyoxyethylene ether monomer 90-95%, the mass ratio of unsaturated polyoxyethylene ether monomer, chain transfer agent and initiator is 1000:10:5;

[0031] Step 2) Stir and dissolve the unsaturated acid monomer with a mass ratio of 1:(2.5-3):(1-2), molecular weight modifier A and water to prepare liquid A;

[0032] Step 3) Stir and dissolve the molecular weight regulator B with a mass ratio of 1: (50-60) and water to prepare liquid B;

[0033] Step 4) Add liquid A and liquid B dropwise in the reaction kettle at the same time,...

Embodiment 3

[0036] On the basis of Example 2, this embodiment provides a high slump retention polycarboxylate water reducer, the preparation process of the polycarboxylate retention mother liquor includes the following steps:

[0037] Step 1) Add unsaturated polyoxyethylene ether monomer and water into the reaction kettle, stir to dissolve and heat up to 20°C, and add chain transfer agent and initiator, wherein the mass of water accounts for the mass of unsaturated polyoxyethylene ether monomer 90%, the mass ratio of unsaturated polyoxyethylene ether monomer, chain transfer agent and initiator is 1000:10:5;

[0038] Step 2) Stir and dissolve the unsaturated acid monomer with a mass ratio of 1:2.5:1, molecular weight regulator A and water to prepare liquid A;

[0039] Step 3) Stir and dissolve the molecular weight regulator B with a mass ratio of 1:50 and water to prepare liquid B;

[0040] Step 4) Add liquid A and liquid B dropwise in the reaction kettle at the same time, control the rea...

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Abstract

The invention provides a high-slump-resistance polycarboxylate water reducer. The high-slump-resistance polycarboxylate water reducer is composed of, by weight percentage, 10-25% of polycarboxylate slump-resistant mother liquor, 28-35% of polycarboxylate water reducing mother liquor, 4% of setting retarding components and water as balance. By adding in hydrophobic slow release ester groups, the high-slump-resistance polycarboxylate water reducer can avoid being adsorbed by cement particles during the early stage of cement hydration and meanwhile can be slowly released inside alkaline solutioninto water reducer molecules with water reducing effects to achieve water-reduced dispersion; the release speed can be adjusted according to requirements on environment, alkalinity and construction and by changing the number of slow release groups and the molar mass ratio of acid esters. By compounding the polycarboxylate slump-resistant mother liquor and the polycarboxylate water reducing motherliquor, the high-slump-resistance polycarboxylate water reducer is low in mixing amount and high in water-reducing and slump-resistant performance; the slump-resistant time can be flexibly adjusted according to the requirements on construction concrete transportation distance and time, the concrete slump-resistant time can be prolonged by 1-4 hours, so that high cement adaptability can be achieved.

Description

technical field [0001] The invention belongs to the technical field of concrete additives, in particular to a high-slump polycarboxylate water reducer. Background technique [0002] Polycarboxylate superplasticizers are widely used due to their low dosage, high water reducing rate, and environmental protection. At present, the synthesis method of polycarboxylic acid mother liquor is mainly the direct copolymerization method of polymerizable monomers. The active large monomer is mixed with a certain proportion of small monomers. Under the action of initiator and chain transfer agent, polymerization reaction occurs in an aqueous solution at a certain temperature. The synthesized polycarboxylic acid mother liquor has a high water-reducing rate and certain slump-preserving performance, which can meet the needs of general engineering. [0003] However, for projects with long distances or long transportation times, relying solely on the slump retention performance of this type of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C08F283/06C08F220/06C08F222/06C08F2/38C04B103/30
Inventor 戚帅吕昌裕陈莉王光敏武尚文
Owner CHINA HYDROPOWER ELEVENTH ENG BUREAU ZHENGZHOU CO LTD
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