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Early-strength water reducing agent containing phosphate monomer and preparation method of early-strength water reducing agent

An early-strength, water-reducing agent technology, which is applied in the field of construction admixtures, can solve the problems of the late strength of concrete, the impact of concrete fluidity, the impact of long-term mechanical properties of concrete, durability, and poor early-strength effects, and shorten the setting time. , early strength and other effects of high age strength and high water reduction rate

Pending Publication Date: 2022-03-18
厦门路桥翔通建材科技有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of early-strength admixtures is mainly obtained by compounding inorganic salt early-strength agents such as sulfate and chloride salts and organic early-strength agents such as triethanolamine and triisopropanolamine with ordinary water reducers. The early strength agent is easy to introduce chloride ion, sulfate ion, etc., which will affect the long-term mechanical properties and durability of the concrete, while the early strength effect of the organic early strength agent is not good when the dosage is low, and the late strength of the concrete is affected when the dosage is high. Or affect the fluidity of concrete

Method used

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  • Early-strength water reducing agent containing phosphate monomer and preparation method of early-strength water reducing agent
  • Early-strength water reducing agent containing phosphate monomer and preparation method of early-strength water reducing agent
  • Early-strength water reducing agent containing phosphate monomer and preparation method of early-strength water reducing agent

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Experimental program
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Effect test

Embodiment 1

[0031] Preparation of unsaturated phosphate functional monomer: add 50 parts by weight of 2-methallyl alcohol and 105 parts by weight of phosphorus pentoxide into the reaction device, heat the temperature to 85-90°C, add 0.8 parts by weight of phosphotungsten Acid, keep warm for 4±1h to obtain unsaturated phosphate functional monomer;

[0032] Preparation of early-strength water reducer containing phosphate monomer:

[0033] (1) 200 parts by weight of HPEG4000 molecular weight macromonomer, 5 parts by weight of acrylamide, 1.5 parts by weight of ammonium persulfate, and 270 parts by weight of deionized water are put into the reactor device, and stirred to obtain a mixture;

[0034] (2) 25 parts by weight of unsaturated phosphate functional monomer, 3 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, and 15 parts by weight of deionized water are dropped into the dropping device, and mixed uniformly to obtain the first Drop feed;

[0035] (3) 0.5 parts by weight of...

Embodiment 2

[0039] Preparation of unsaturated phosphate functional monomer: add 50 parts by weight of 2-methallyl alcohol and 105 parts by weight of phosphorus pentoxide into the reaction device, heat the temperature to 85-90°C, add 1.3 parts by weight of phosphotungsten Acid, keep warm for 4±1h to obtain unsaturated phosphate functional monomer;

[0040] Preparation of early-strength water reducer containing phosphate monomer:

[0041] (1) Put 200 parts by weight of TPEG6000 molecular weight macromonomer, 8 parts by weight of acrylamide, 2.0 parts by weight of ammonium persulfate, and 280 parts by weight of deionized water into the reactor device, and stir to obtain a mixture;

[0042] (2) 25 parts by weight of unsaturated phosphate functional monomer, 5.5 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, and 20 parts by weight of deionized water are dropped into the dropping device, and mixed uniformly to obtain the first Drop feed;

[0043] (3) 0.5 parts by weight of vita...

Embodiment 3

[0047] Preparation of unsaturated phosphate functional monomer: Add 50 parts by weight of butenol and 75 parts by weight of phosphoric acid into the reaction device, heat the temperature to 85-90°C, add 1.0 parts by weight of phosphotungstic acid, and keep it warm for 4±1h. That is, the unsaturated phosphate ester functional monomer is obtained;

[0048] Preparation of early-strength water reducer containing phosphate monomer:

[0049] (1) Put 200 parts by weight of HPEG4000 molecular weight macromonomer, acrylamide of 6.5 parts by weight, 2.0 parts by weight of ammonium persulfate, and 280 parts by weight of deionized water into the reactor device, and stir to obtain a mixture;

[0050] (2) 30 parts by weight of unsaturated phosphate functional monomer, 3 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, and 20 parts by weight of deionized water are dropped into the dropping device, and mixed uniformly to obtain the first Drop feed;

[0051] (3) 0.68 parts by we...

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Abstract

The invention discloses an early-strength water reducing agent containing a phosphate monomer and a preparation method of the early-strength water reducing agent. The invention relates to a high-performance water reducing agent which is prepared from an unsaturated phosphate monomer, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, a polyether macromonomer, a chain transfer agent, an oxidizing agent, a reducing agent, deionized water and liquid caustic soda with the concentration of 30-33wt% according to the mass ratio of (25-30): (5-8): (3-6): 200: (1-1.5): (1-2): (0.5-0.7): (320-340): (10-15) at normal temperature. The early-strength water reducing agent prepared by the invention has the characteristics of high water reducing rate, short concrete setting time and high concrete early strength and other age strength.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to an early-strength water reducer containing phosphoric acid ester monomers and a preparation method thereof. Background technique [0002] In recent years, my country's high-speed railway, light rail, subway, etc. have undergone large-scale construction of subway concrete segments, track shield segments, high-speed rail track slabs and other prefabricated components. On the other hand, prefabricated concrete components based on the concept of housing industrialization The assembly construction method is also more and more recognized by people. Compared with ready-mixed concrete, precast concrete can greatly improve production efficiency, save manpower, reduce labor intensity of workers, reduce management links, reduce the impact of personnel technical level on project quality, improve environmental protection benefits and promote social development. Therefo...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/56C08F220/58C08F230/02C04B24/24C04B103/30C04B103/10
CPCC08F283/065C04B24/246C04B2103/302C04B2103/10C08F220/56C08F220/585C08F230/02Y02W30/91
Inventor 黄海超陈建军汤明辉
Owner 厦门路桥翔通建材科技有限公司
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