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Early-strength polycarboxylic acid water reducing agent for subway segment and preparation method of early-strength polycarboxylic acid water reducing agent

A subway segment, early-strength technology, applied in the field of concrete admixtures, can solve the problems of limited use and slow development of concrete strength, and achieve the effects of promoting hydration, improving the convenience of colleges and universities, and strong cross-linking effect.

Inactive Publication Date: 2022-01-11
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, because the existing polycarboxylate-based water-reducers can delay the hydration of cement, the early strength of concrete develops slowly, which limits its use in subway prefabricated segmental concrete and cold climates

Method used

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  • Early-strength polycarboxylic acid water reducing agent for subway segment and preparation method of early-strength polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Step 1. Add 150 parts of modified polyether macromonomer, 10 parts of vinyltriacetoxysilane, 2.5 parts of sodium hypophosphite and 150 parts of water into a three-necked flask, turn on the high-speed stirring device, and the stirring speed is at 350rpm. Heat to 63°C and stir to form a monomer mixed solution;

[0051] Wherein, the preparation step of the modified polyether macromonomer is as follows: 200 parts of 6000 molecular weight isopentenol polyoxyethylene ether, 20 parts of methacrylic acid and 180 parts of water are placed in a nitrogen-protected high-speed shear stirring device, Add 22 parts of N-methylolacrylamide, the reaction temperature is 70° C., and continue the reaction for 2 hours to obtain a modified polyether macromonomer.

[0052] After mixing 1.2 parts of ammonium persulfate with 20 parts of water, add it to the first automatic dripping device, and adjust the dripping time to be 180min;

[0053] Mix 25 parts of methacryloyloxyethyl phosphonate, 8 pa...

Embodiment 2

[0057] Step 1. Add 160 parts of modified polyether macromonomer, 10 parts of vinyltriacetoxysilane, 2.8 parts of sodium hypophosphite and 160 parts of water into a three-necked flask, turn on the high-speed stirring device, and the stirring speed is at 350rpm, while Heat to 63°C and stir to form a monomer mixed solution;

[0058] Wherein, the preparation step of the modified polyether macromonomer is as follows: 200 parts of 6000 molecular weight isopentenol polyoxyethylene ether, 15 parts of methacrylic acid and 180 parts of water are placed in a nitrogen-protected high-speed shear stirring device, Add 20 parts of N-methylolacrylamide, the reaction temperature is 70° C., and continue the reaction for 2 hours to obtain a modified polyether macromonomer.

[0059] After mixing 1.2 parts of ammonium persulfate with 20 parts of water, add it to the first automatic dripping device, and adjust the dripping time to be 180min;

[0060] Mix 22 parts of methacryloyloxyethyl phosphonate...

Embodiment 3

[0064] Step 1. Add 170 parts of modified polyether macromonomer, 12 parts of vinyltriacetoxysilane, 2.5 parts of sodium hypophosphite and 170 parts of water into a three-necked flask, turn on the high-speed stirring device, and the stirring speed is at 350rpm, while Heat to 63°C and stir to form a monomer mixed solution;

[0065] Wherein, the preparation step of the modified polyether macromonomer is as follows: 200 parts of 6000 molecular weight isopentenol polyoxyethylene ether, 18 parts of methacrylic acid and 180 parts of water are placed in a nitrogen-protected high-speed shear stirring device, Add 22 parts of N-methylolacrylamide, the reaction temperature is 70° C., and continue the reaction for 2 hours to obtain a modified polyether macromonomer.

[0066] After mixing 0.8 parts of ammonium persulfate with 20 parts of water, add it to the first automatic dripping device, and adjust the dripping time to be 180min;

[0067] Mix 20 parts of methacryloyloxyethyl phosphonate...

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Abstract

The invention relates to the technical field of concrete admixtures, in particular to an early-strength polycarboxylic acid water reducing agent for a subway segment and a preparation method of the early-strength polycarboxylic acid water reducing agent. The water reducing agent is obtained by copolymerizing a modified polyether macromonomer, a phosphonic acid group-containing functional monomer, a sulfonic acid group functional monomer, a vinyl siloxane functional monomer and a first unsaturated acid (anhydride), wherein the modified polyether macromonomer is prepared from an unsaturated polyether monomer, a second unsaturated acid (anhydride) and an amidation reagent through amidation reaction. According to the early-strength polycarboxylate water reducing agent for the subway segment, the vinyl siloxane functional monomer, the phosphonic acid group-containing functional monomer and the sulfonic acid group-containing functional monomer are introduced into the molecular structure of the polycarboxylate water reducing agent, so that the polycarboxylate water reducing agent for the subway segment, which is high in early strength and dispersity, is prepared; therefore, the application of the subway segment concrete is improved, and good economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an early-strength polycarboxylate water reducer for subway segments and a preparation method thereof. Background technique [0002] With the rapid development of my country's infrastructure construction, the advantages of subway travel are increasingly favored by people. At present, in the development process of the subway, more and more shield methods are used in the construction of subway projects, so the demand for concrete segments is increasing. Due to the particularity of the project, the subway often faces various problems such as corrosion, carbonization, load, and train vibration, which seriously affect the safe operation and service life of the subway. Therefore, the restoration of subway segments has become one of the key subjects of research. [0003] At present, prefabricated segmental concrete in the market is generally prepared with polycarboxylate su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F230/08C08F230/02C08F228/02C08F220/06C04B24/16C04B103/30
CPCC08F290/062C04B24/165C04B2103/302C08F230/085C08F230/02C08F228/02C08F220/06
Inventor 朱少宏林艳梅赖华珍方云辉于飞宇朱巧勇
Owner KZJ NEW MATERIALS GROUP CO LTD
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