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Viscosity reduction type water reducer and preparation method thereof

A water-reducing agent and viscosity-reducing technology, applied in the field of viscosity-reducing water-reducing agent and its preparation, can solve the problems of increasing cost, increasing the adaptability of concrete sand and gravel materials, affecting the appearance of concrete, etc.

Active Publication Date: 2021-09-10
上海抚佳精细化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the problems of increasing the dosage of water reducing agent in the prior art, causing excessive retardation of the slurry and rising of the gas content, or conventional polycarboxylate water reducing The agent has defects such as poor adaptability to concrete sandstone materials and air content affecting the appearance of concrete, thereby providing a viscosity-reducing water-reducing agent and a preparation method thereof

Method used

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  • Viscosity reduction type water reducer and preparation method thereof
  • Viscosity reduction type water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a viscosity-reducing water reducer, and the preparation method includes the following steps:

[0038] Under heating at 70°C and stirring, 40g of phenol polyoxyethylene polyoxypropylene ether (Mw=400, EO:PO=1:1, product model PCS0411), 30g of 2-naphthol polyoxyethylene polyoxypropylene Ether (Mw=600, EO:PO=2:1, product model PCK0621), 27.6g of salicylic acid, 9.4g of phenol, 14.4g of 2-naphthol and 126g of water were mixed and stirred evenly.

[0039] Then carry out nitrogen replacement and raise the temperature to 70°C, slowly add 19.6g of catalyst concentrated sulfuric acid (98wt%) and control the material temperature to stabilize at 70°C.

[0040] Start to add 18g of formaldehyde solution dropwise at a constant speed, and the dropping time is 0.5h.

[0041] After the dropwise addition, the mixture was aged and kept at 70° C. for 1 h.

[0042] After the reaction is completed, lower the temperature to below 50°C, add hydroxyethylethylenediamin...

Embodiment 2

[0044] This embodiment provides a viscosity-reducing water reducer, and the preparation method includes the following steps:

[0045] Under heating at 70°C and stirring, 80g of phenol polyoxyethylene polyoxypropylene ether (Mw=800, EO:PO=3:1, product model PCS0831), 60g of 2-naphthol polyoxyethylene polyoxypropylene Ether (Mw=600, EO:PO=4:1, product model PCK0641), 34.5g of salicylic acid, 10.8g of p-cresol, 21.6g of 2-naphthol and 216g of water were mixed and stirred evenly.

[0046] Then carry out nitrogen replacement and raise the temperature to 90°C, slowly add 14.7g of catalyst concentrated sulfuric acid (98wt%) and control the material temperature to stabilize at 90°C.

[0047] Start to add 33g of acetaldehyde solution dropwise at a constant speed, and the dropping time is 1.5h.

[0048]After the dropwise addition, it was aged and kept at 90° C. for 3 hours.

[0049] After the reaction is completed, lower the temperature to below 50°C, add triethanolamine for neutraliz...

Embodiment 3

[0051] This embodiment provides a viscosity-reducing water reducer, and the preparation method includes the following steps:

[0052] Under heating and stirring at 70°C, 120g of phenol polyoxyethylene polyoxypropylene ether (Mw=1200, EO:PO=2:1, product model PCS1221), 40g of 2-naphthol polyoxyethylene polyoxypropylene Ether (Mw=1600, EO:PO=3:1, product model PCK1631), 20.7g of salicylic acid, 4.7g of phenol, 14.4g of 2-naphthol and 180g of water were mixed and stirred evenly.

[0053] Then carry out nitrogen replacement and raise the temperature to 100°C, slowly add 9.8g of catalyst concentrated sulfuric acid (98wt%) and control the material temperature to stabilize at 100°C.

[0054] Start to add 19.8g of acetaldehyde solution dropwise at a constant speed, and the dropping time is 2h.

[0055] After the dropwise addition, it was aged and kept at 100° C. for 2 hours.

[0056] After the reaction is completed, lower the temperature to below 50°C, add triisopropanolamine for ne...

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Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a viscosity reduction type water reducer and a preparation method thereof. A high-molecular polymer with a comb-shaped structure is prepared in a polycondensation mode, and compared with a common naphthalene water reducer, the polymer has the advantage of side chain steric hindrance, and the water reducing rate is higher; and compared with a common polycarboxylate-type water reducer, the water reducer of the invention has the advantages that the polymerization molecular weight is easier to control, the comb-structure high-molecular polymer with smaller molecular weight is obtained, the dispersing capacity of water reducer molecules is improved, the viscosity of concrete is reduced, a higher polyether conversion rate can be achieved, and the gas content of the concrete under the high mixing amount of the water reducer is reduced.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a viscosity-reducing water reducer and a preparation method thereof. Background technique [0002] Concrete is the most widely used and used construction material in the entire construction industry. With the development of infrastructure construction, the application technology of concrete has reached a new stage of development, and the scope of application is also expanding. Concrete is widely used in civil buildings, subway tunnels, water conservancy projects, cross-sea bridges, nuclear power projects, prefabricated buildings, etc. With the development of concrete applications, higher requirements are put forward for concrete properties, such as high fluidity, low viscosity self-compacting, low air-entrainment, high strength and high durability, etc. [0003] In order to achieve these performance requirements of concrete, concrete admixture is an essenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/24C08G8/04C04B24/30C04B103/30
CPCC08G8/24C08G8/04C04B24/30C04B2103/302
Inventor 李亚杰何新耀李玉博
Owner 上海抚佳精细化工有限公司