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Re-modified high efficiency water reducer and preparation method thereof

A high-efficiency water reducing agent and secondary modification technology, which is applied in the field of building materials, can solve the problems affecting the performance, mechanics and durability of concrete mixtures, cannot be mixed with each other, and the water reducing rate is reduced, so as to solve the problem of processing cost, Good compatibility and high water-reducing rate

Active Publication Date: 2016-12-07
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite its outstanding advantages, a large number of studies have shown that the compatibility of polycarboxylate-based high-performance water-reducers with traditional polycondensation-type high-efficiency water-reducers, especially naphthalene-based high-efficiency water-reducers is poor, which will seriously affect the concrete mixture. Performance, mechanics, and durability, resulting in increased gas content, rapid collapse, and greatly reduced water reducing rate. They cannot be mixed with each other like traditional polycondensation-type high-efficiency water reducers, which greatly affects their application range.

Method used

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  • Re-modified high efficiency water reducer and preparation method thereof
  • Re-modified high efficiency water reducer and preparation method thereof
  • Re-modified high efficiency water reducer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0053]A modified water reducing agent whose chemical structural formula is:

[0054]

[0055] Wherein, x=3-20, y=3-20.

[0056] The preparation method of the high-efficiency water reducer of secondary modification, comprises the steps:

[0057] 1) In parts by weight, take by weighing 50 parts of raw material sulfonating agent sodium sulfite, 150 parts of water, 50 parts of acetone, 15 parts of modifier guaiacol, 140 parts of formaldehyde, 320 parts of modifier B (by large order bulk HPEG and acrylic acid by free radical copolymerization polycarboxylate superplasticizer), 0.4 parts of initiator ammonium persulfate;

[0058] 2) Add 50 parts of sodium sulfite and 150 parts of water into the flask, stir until completely dissolved, add 50 parts of acetone and continue to stir for 10 minutes, then add 15 parts of modifier guaiacol, react at 40-45°C for 1 hour for sulfonation reaction;

[0059] 3) Continue to drop 140 parts of formaldehyde into the solution system obtained after...

Embodiment 2

[0068] A modified water reducing agent whose chemical structural formula is:

[0069]

[0070] Wherein, Lignin is the fragment structure except the guaiacol fragment in the lignin structure; x and y are the repeating unit numbers of the polycondensate, wherein x=3-20, y=3-20.

[0071] The preparation method of the above-mentioned secondary modified high-efficiency water reducer comprises the following steps:

[0072] 1) In parts by weight, take 50 parts of raw material sulfonating agent sodium sulfite, 150 parts of water, 50 parts of acetone, 75 parts of modifier lignin, 140 parts of formaldehyde, modifier B (made from macromonomer HPEG and acrylic acid Synthetic polycarboxylic acid polymer) 310 parts, initiator ammonium persulfate 0.4 part;

[0073] 2) Add 50 parts of sodium sulfite and 150 parts of water into the flask, stir until completely dissolved, add 50 parts of acetone and continue to stir for 10 minutes, then add modifier lignin (purified by acid precipitation fr...

Embodiment 3

[0082] A modified water reducer whose chemical structural formula is the same as that of Example 2.

[0083] The preparation method of the above-mentioned secondary modified high-efficiency water reducer comprises the following steps:

[0084] 1) In parts by weight, take by weighing 50 parts of raw material sulfonating agent sodium sulfite, 150 parts of water, 50 parts of acetone, 150 parts of modifier black liquor, 140 parts of formaldehyde, modifier B (made of macromonomer HPEG and acrylic acid Synthetic polycarboxylic acid polymer) 270 parts, 0.4 part of initiator ammonium persulfate;

[0085] 2) Add 50 parts of sodium sulfite and 150 parts of water into the flask, stir until completely dissolved, add 50 parts of acetone and continue to stir for 10 minutes, then add 150 parts of modifier papermaking pulping black liquor (wherein the lignin content is 46.5%) and catalyst 0.2 parts, react at 40-45°C for 1 hour for sulfonation reaction;

[0086] 3) Continue to add 140 parts ...

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Abstract

The invention relates to a re-modified high efficiency water reducer. The re-modified high efficiency water reducer comprises 1, mixing and dissolving 40-50 parts by weight of a sulfonating agent, 0-50 parts by weight of liquid alkali and 150-180 parts by weight of water, adding 50-60 parts by weight of acetone into the mixed solution, carrying out uniform mixing, adding 15-150 parts by weight of a modifier A into the mixture and carrying out a sulfonation reaction process, 2, dropwisely adding 135-165 parts by weight of formaldehyde into the solution system after sulfonation, and then carrying out a condensation reaction process at a temperature of 95-98 DEG C to obtain a modified water reducer, and 3, adding 250-400 parts by weight of a modifier B and 0.3-0.5 parts by weight of an initiator into the modified water reducer and carrying out a re-modification process to obtain the re-modified high efficiency water reducer. The re-modified high efficiency water reducer has a low mixing amount and a high water-reducing rate, can be compounded with the traditional polycondensation-type high efficiency water reducers such as naphthalene and aliphatic water reducers and polycarboxylic acid high performance water reducers and has stable product performances.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a secondary modified high-efficiency water reducer and a preparation method thereof. Background technique [0002] When two or more surfactants are compounded with each other, due to the synergistic effect between surfactant molecules, they can give full play to their respective advantages and make up for their respective disadvantages to a certain extent, and the overall performance and cost performance are often superior. in a single species. For example, when the polycondensation type high-efficiency water reducer is combined with ordinary water reducers, it can improve the workability of concrete to a certain extent, and the cost performance is also better than the above two single varieties. The use of aliphatic water reducer or sulfamic acid water reducer alone can easily lead to segregation and bleeding of concrete mixture, and the combination with naphthalene ...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08G65/48C04B24/16C04B103/30
CPCC04B24/166C04B2103/302C08G65/48C08G81/025
Inventor 马双平丁庆军周芬朱华雄
Owner WUHAN UNIV OF TECH
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