Anti-mud tannic acid-based star-shaped polycarboxylate superplasticizer and preparation method thereof

A tannic acid-based, anti-mud technology, applied in the field of building material admixtures, can solve the problems of insignificant anti-mud effect, single molecular structure, complex preparation process, etc., and achieve good dispersion and dispersion retention, surface The effect of rich functional groups and small hydrodynamic volume

Active Publication Date: 2020-09-29
GUIZHOU EDUCATION UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, previous researchers mainly focus on the preparation of polycarboxylate water reducers with anti-mud effect by introducing anti-mud functional monomers into traditional comb-type polycarboxylate water-reducing molecules through molecular structure design, but there are often problems with single molecular structure and preparation. Problems such as complex process, high production cost, and insignificant anti-mud effect

Method used

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  • Anti-mud tannic acid-based star-shaped polycarboxylate superplasticizer and preparation method thereof
  • Anti-mud tannic acid-based star-shaped polycarboxylate superplasticizer and preparation method thereof
  • Anti-mud tannic acid-based star-shaped polycarboxylate superplasticizer and preparation method thereof

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Embodiment 1

[0021] A preparation method of an anti-mud type tannic acid-based star polycarboxylate water reducer, comprising the following steps:

[0022] Add 250g of water and 300g of polyether macromonomer APEG to a 1000mL four-neck round-bottomed flask equipped with a thermometer, an electric stirrer, a constant temperature electric heating mantle, and a peristaltic pump. 12g of tannic acid functional monomer, stirred and raised to 58°C, dissolved evenly, directly added a mixed solution of 3.9g of ammonium persulfate and 16g of water and stirred for 10 minutes to fully dissolve. Add dropwise the mixed aqueous solution that is made up of 45g of acrylic acid, 7g of methacryloyloxyethyltrimethylammonium chloride, 76g of water and the mixed solution of ascorbic acid 0.80g, mercaptopropionic acid 1.6g, and water 90g in 3 hours, Keep the temperature between 57-60°C; continue to react for 2 hours after the dropwise addition is completed, then cool down to 30-35°C, add 30% sodium hydroxide sol...

Embodiment 2

[0025] A preparation method of an anti-mud type tannic acid-based star polycarboxylate water reducer, comprising the following steps:

[0026] Add 250g of water and 300g of polyether macromonomer HPEG to a 1000mL four-neck round-bottomed flask equipped with a thermometer, an electric stirrer, a constant temperature electric heating mantle, and a peristaltic pump. 12g of tannic acid functional monomer, stirred and raised to 58°C, dissolved evenly, directly added a mixed solution of 3.9g of ammonium persulfate and 16g of water and stirred for 10 minutes to fully dissolve. Add dropwise the mixed aqueous solution that is made up of 45g of acrylic acid, 7g of methacryloyloxyethyltrimethylammonium chloride, 76g of water and the mixed solution of ascorbic acid 0.80g, mercaptopropionic acid 1.6g, and water 90g in 3 hours, Keep the temperature between 57-60°C; continue to react for 2 hours after the dropwise addition is completed, then cool down to 30-35°C, add 30% sodium hydroxide sol...

Embodiment 3

[0029] A preparation method of an anti-mud type tannic acid-based star polycarboxylate water reducer, comprising the following steps:

[0030] Add 250g of water and 300g of polyether macromonomer TPEG to a 1000mL four-necked round-bottomed flask equipped with a thermometer, an electric stirrer, a constant temperature electric heating mantle, and a peristaltic pump. 12g of tannic acid functional monomer, stirred and raised to 58°C, dissolved evenly, directly added a mixed solution of 3.9g of ammonium persulfate and 16g of water and stirred for 10 minutes to fully dissolve. Add dropwise the mixed aqueous solution that is made up of 45g of acrylic acid, 7g of methacryloyloxyethyltrimethylammonium chloride, 76g of water and the mixed solution of ascorbic acid 0.80g, mercaptopropionic acid 1.6g, and water 90g in 3 hours, Keep the temperature between 57-60°C; continue to react for 2 hours after the dropwise addition is completed, then cool down to 30-35°C, add 30% sodium hydroxide s...

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Abstract

The invention discloses an anti-mud tannic acid-based star-shaped polycarboxylate superplasticizer and a preparation method thereof. The star-shaped polycarboxylate superplasticizer is a copolymer formed by polymerizing an unsaturated polyether macromonomer, acrylic acid, a diallylamine modified tannic acid functional monomer and methacryloyloxyethyl trimethyl ammonium chloride or dimethyl diallylammonium chloride serving as raw materials through a free radical copolymerization reaction in the presence of an initiator and a chain transfer agent; the unsaturated polyether macromonomer is selected from any one or two of APEG, HPEG and TPEG; the initiator is selected from at least one of hydrogen peroxide, ammonium persulfate and potassium persulfate; and the chain transfer agent is selectedfrom at least one of mercaptopropionic acid, mercaptoacetic acid, sodium hypophosphite, sodium methallyl sulfonate and sodium allylsulfonate. According to the designed and synthesized mud-resistant tannic acid-based star-shaped polycarboxylate superplasticizer, cement particles can be fully dispersed and wetted, the influence of mud on the cement particles can be reduced, and good mud resistance is shown.

Description

technical field [0001] The invention belongs to the technical field of building material admixtures, in particular to a mud-resistant tannic acid-based star-shaped polycarboxylate water reducer and a preparation method thereof 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 and long-span and special functional requirements continue to appear, requiring concrete to have higher strength, better durability, and better stability. Polycarboxylate superplasticizer has many advantages such as low dosage, high water reducing rate, high slump retention performance, adjustable molecular structure, and environmental friendliness, and has been widely used in concrete. However, in the actual production and application of concrete, it is found that with the rapid increase in the amount of domestic infrastructure proj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F226/02C08F220/06C08F220/34C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F226/02C08F220/06C08F220/34
Inventor 王毓任俊鹏赵君夏卉芳方东
Owner GUIZHOU EDUCATION UNIV
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