A kind of preparation method of tannic acid-based star polycarboxylate water reducer

A tannic acid-based star, polycarboxylic acid technology, applied in the field of building materials, can solve the problems of molecular structure, insufficient product variety, single molecular structure, complex preparation process, etc., to achieve novel structure, rich surface functional groups, The effect of small hydrodynamic volume

Active Publication Date: 2022-03-08
GUIZHOU EDUCATION UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carboxylic acid-based high-performance water reducers have only a few decades of development history, and neither the molecular structure nor the product range is rich enough to fully meet the current theoretical and application needs of concrete.
At present, researchers mainly focus on preparing comb-type polycarboxylate superplasticizers to solve the problems of concrete dispersion and dispersion retention through molecular structure design, but there are often problems such as single molecular structure and uncontrollable structure, complex preparation process, and high production cost.

Method used

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  • A kind of preparation method of tannic acid-based star polycarboxylate water reducer
  • A kind of preparation method of tannic acid-based star polycarboxylate water reducer

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Embodiment 1

[0016] A preparation method of a tannic acid-based star-shaped polycarboxylate water-reducer, comprising the preparation of modified tannic acid and the synthesis of a tannic-acid-based star-shaped polycarboxylate water-reducer, and the specific steps are as follows:

[0017] (1) Add 5.48g of sodium hydroxide and 135.0g of deionized water into a three-necked round-bottom flask equipped with a thermometer and an electric stirrer, raise the temperature to 65°C, add 51.0g of tannic acid and stir to dissolve them in the water; then slowly Add 71.0 g of glycidyl methacrylate dropwise, and drop evenly within 3 hours. After the dropwise addition, keep stirring at 65°C for 4 hours. After the reaction, a light brown uniform solution is obtained, which is freeze-dried at low temperature to obtain a modified Tannins.

[0018] (2) Add 250.0g of water, 10.0g of modified tannic acid, and 320.0g of polyether macromonomer HPEG into a 1000mL four-necked round-bottom flask equipped with a therm...

Embodiment 2

[0020] A preparation method of a tannic acid-based star-shaped polycarboxylate water-reducer, comprising the preparation of modified tannic acid and the synthesis of a tannic-acid-based star-shaped polycarboxylate water-reducer, and the specific steps are as follows:

[0021] (1) Add 5.48g of sodium hydroxide and 135.0g of deionized water into a three-necked round-bottom flask equipped with a thermometer and an electric stirrer, raise the temperature to 65°C, add 51.0g of tannic acid and stir to dissolve them in the water; then slowly Add 71.0 g of glycidyl methacrylate dropwise, and drop evenly within 3 hours. After the dropwise addition, keep stirring at 65°C for 4 hours. After the reaction, a light brown uniform solution is obtained, which is freeze-dried at low temperature to obtain a modified Tannins.

[0022] (2) Add 250.0g of water, 15.0g of modified tannic acid, and 320.0g of polyether macromonomer TPEG into a 1000mL four-necked round-bottomed flask equipped with a the...

Embodiment 3

[0024] A preparation method of a tannic acid-based star-shaped polycarboxylate water-reducer, comprising the preparation of modified tannic acid and the synthesis of a tannic-acid-based star-shaped polycarboxylate water-reducer, and the specific steps are as follows:

[0025] (1) Add 5.48g of sodium hydroxide and 135.0g of deionized water into a three-necked round-bottom flask equipped with a thermometer and an electric stirrer, raise the temperature to 65°C, add 51.0g of tannic acid and stir to dissolve them in the water; then slowly Add 71.0 g of glycidyl methacrylate dropwise, and drop evenly within 3 hours. After the dropwise addition, keep stirring at 65°C for 4 hours. After the reaction, a light brown uniform solution is obtained, which is freeze-dried at low temperature to obtain a modified Tannins.

[0026] (2) Add 250g of water, 10g of unsaturated modified tannic acid and 320.0g of polyether macromonomer HPEG into a 1000mL four-necked round bottom flask equipped with ...

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Abstract

The invention discloses a preparation method of a tannic acid-based star-shaped polycarboxylate water reducer. The method is to first add tannic acid, sodium hydroxide and water into a reaction kettle, and then add glycidyl methacrylate dropwise. , and react to obtain modified tannic acid; then react modified tannic acid, unsaturated polyether macromonomer, unsaturated fatty acid small monomer, initiator and chain transfer agent and water at 50-80°C for 3-6 hours , to obtain a star-shaped copolymer, and then adjust the pH value in the range of 6.0-7.0 with an alkaline substance to obtain a reddish-brown solution, which is the tannic acid-based star-shaped polycarboxylate superplasticizer. The tannic acid-based star-shaped polycarboxylate superplasticizer of the present invention has many molecular branches, low viscosity, small hydrodynamic volume, rich surface functional groups, and a large number of hydroxyl groups on the tannic acid molecule. These abundant polar groups and The polar surface of cement particles has a strong hydrophilic effect, which can form a hydration film on the surface of cement particles, so that the cement particles can be fully dispersed and wetted.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of a tannic acid-based star polycarboxylate water reducer. Background technique [0002] In recent years, with the continuous expansion of the scale of civil engineering and the continuous improvement of the level of science and technology, some important buildings with high-rise, long-span and special functional requirements continue to appear, such as skyscrapers, super-long-span bridges, high-speed railways and giant water conservancy projects. Construction, etc. , requiring concrete to have higher strength, better durability, and better stability. Water reducing agent is one of the indispensable important components of high performance concrete. Water reducing agent can reduce the water consumption of concrete during use, improve its durability, improve the collapse retention, change the properties of concrete, and improve the perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F222/20C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F222/02C08F222/1006
Inventor 王毓任俊鹏赵君夏卉芳
Owner GUIZHOU EDUCATION UNIV
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