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A high-efficiency water reducer with good compatibility and its preparation method

A high-efficiency water-reducing agent and compatibility technology, 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 treatment cost, relative Good capacity and high water reducing rate

Active Publication Date: 2019-03-08
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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  • A high-efficiency water reducer with good compatibility and its preparation method
  • A high-efficiency water reducer with good compatibility and its preparation method
  • A high-efficiency water reducer with good compatibility and its preparation method

Examples

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Effect test

Embodiment 1

[0043] A high-efficiency water reducer G101 with good compatibility, its chemical structural formula is:

[0044]

[0045] Wherein, x=3-20, y=3-20.

[0046] The preparation method of the above-mentioned high-efficiency water reducer with good compatibility comprises the following steps:

[0047] 1) In parts by weight, take 50 parts of raw material sulfonating agent sodium sulfite, 150 parts of water, 50 parts of acetone, 15 parts of modifier guaiacol, and 140 parts of formaldehyde;

[0048] 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;

[0049] 3) Continue to add 140 parts of formaldehyde dropwise to the solution system obtained after sulfonation, and the dropping time is controlled at 2 hours. After the dropwise addition of formaldehyde is completed, keep warm ...

Embodiment 2

[0056] A high-efficiency water reducer with good compatibility, its chemical structural formula is:

[0057]

[0058] 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.

[0059] The preparation method of the above-mentioned high-efficiency water reducer with good compatibility comprises the following steps:

[0060] 1) In parts by weight, weigh 50 parts of raw material sulfonating agent sodium sulfite, 150 parts of water, 50 parts of acetone, 75 parts of modifier lignin, and 140 parts of formaldehyde;

[0061] 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 from papermaking pulping black liquor and use liquid sodium hydroxide Dissolved 75 parts of alkali-soluble acid anal...

Embodiment 3

[0068] A high-efficiency water reducer with good compatibility, its chemical structure is the same as that of Example 2.

[0069] The preparation method of the above-mentioned high-efficiency water reducer with good compatibility comprises the following steps:

[0070] 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, and 140 parts of formaldehyde;

[0071] 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;

[0072] 3) Continue to add 140 parts of formaldehyde dropwise to the solution system obtained after the sulfonation, and the dropping time is controlled at ...

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Abstract

The invention relates to a high-efficiency water reducing agent with good compatibility. A preparation method of the high-efficiency water reducing agent includes the steps: 1) in parts by weight, mixing 40-50 parts of sulfonation agents, 0-50 parts of liquid caustic soda and 150-180 parts of water to dissolve, then adding 50-60 parts of acetone, uniformly mixing the raw materials, and adding 15-150 parts of modifying agents to perform sulfonation reaction; 2) continuously dropping 135-165 parts of formaldehyde into an obtained solution system after sulfonation is finished, keeping the temperature of 95-98 DEG C after the formaldehyde is completely dropped to perform condensation reaction to obtain the high-efficiency water reducing agent with good compatibility. The high-efficiency water reducing agent with good compatibility has the advantages that the water reducing agent is low in mixing amount, high in water reducing rate and stable in product performance, and the high-efficiency water reducing agent can be compounded with traditional polycondensation-type high-efficiency water reducing agents such as naphthalene series and aliphatic series and high-performance water-reducing agents such as polycarboxylic acid.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a high-efficiency water reducer with good compatibility 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 naphtha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/28C08G6/02C04B24/16C04B103/30
CPCC04B24/166C04B2103/302C08G6/02C08G8/28
Inventor 马双平丁庆军周芬朱华雄
Owner WUHAN UNIV OF TECH
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