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Concrete water reducer and preparation method thereof

A technology of concrete water reducing agent and mixed solution, applied in the field of water reducing agent, can solve the problems of poor water retention of concrete, restrictions on the application of sulfamate high-efficiency water reducing agent, bleeding and segregation, etc., and achieve high water reducing rate, Effect of improving fluidity and improving bleeding

Active Publication Date: 2017-11-24
贵州凯襄新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the application of sulfamic acid-based high-efficiency water-reducing agents, the water retention of concrete is not good, and bleeding and segregation are serious, which restricts the application of sulfamate high-efficiency water-reducing agents in concrete

Method used

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  • Concrete water reducer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of concrete water reducer, comprising the steps of:

[0025] a) Add 100 parts by weight of 4,4-bis(4-hydroxyphenyl)valeric acid, 355 parts by weight of polypropylene glycol and 8.6 parts by weight of p-toluenesulfonic acid into the reaction vessel, mix well and carry out esterification at 151°C Reaction, obtains modified bisphenolic acid;

[0026] b) Mixing modified bisphenolic acid, 18 parts by weight of sodium citrate, and 38 parts by weight of anhydrous dodecylbenzenesulfonic acid in 2300 parts by weight of water to obtain a mixed solution with a pH value of 7.2;

[0027] c) Add 98 parts by weight of 37wt% industrial formaldehyde to the mixed solution, control the rate of addition to complete the dropwise addition within 1.5 hours, and heat the mixed solution to 46°C, react for 0.7h, continue to heat the mixed solution to 77°C, and react After 7.5 hours, an aqueous solution containing a water reducing agent was obtained.

Embodiment 2

[0029] A preparation method of concrete water reducer, comprising the steps of:

[0030] a) Add 100 parts by weight of 4,4-bis(4-hydroxyphenyl)valeric acid, 360 parts by weight of polypropylene glycol and 9 parts by weight of p-toluenesulfonic acid into the reaction vessel, mix them uniformly and carry out esterification at 155°C Reaction, obtains modified bisphenolic acid;

[0031] b) Mixing modified bisphenolic acid, 18 parts by weight of sodium citrate, and 40 parts by weight of anhydrous dodecylbenzenesulfonic acid in 3000 parts by weight of water to obtain a mixed solution with a pH value of 7.3;

[0032] c) Add 110 parts by weight of 37wt% industrial formaldehyde dropwise to the mixed solution, control the rate of addition to complete the dropwise addition within 1.3 hours, and heat the mixed solution to 47°C, react for 0.8h, and continue heating the mixed solution to 80°C, After 8 hours of reaction, an aqueous solution containing a water reducing agent was obtained.

Embodiment 3

[0034] A preparation method of concrete water reducer, comprising the steps of:

[0035] a) Add 100 parts by weight of 4,4-bis(4-hydroxyphenyl)valeric acid, 365 parts by weight of polypropylene glycol and 9.5 parts by weight of p-toluenesulfonic acid into the reaction vessel, mix well and carry out esterification at 155°C Reaction, obtains modified bisphenolic acid;

[0036] b) Mix modified bisphenolic acid, 18.3 parts by weight of sodium citrate, and 45 parts by weight of anhydrous dodecylbenzenesulfonic acid in 3300 parts by weight of water to obtain a mixed solution with a pH value of 7.4;

[0037] c) Add 120 parts by weight of 37wt% industrial formaldehyde dropwise to the mixed solution, control the rate of addition to complete the dropwise addition within 1.8 hours, and heat the mixed solution to 47.5°C, react for 1.2h, and continue heating the mixed solution to 90°C, After 8 hours of reaction, an aqueous solution containing a water reducing agent was obtained.

[0038]...

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Abstract

The invention relates to a concrete water reducer and a preparation method thereof. The preparation method comprises steps as follows: 4,4-bis(4-hydroxyphenyl) valeric acid, polypropylene glycol and p-toluene sulfonic acid are added to a reaction vessel and mixed uniformly, a mixture is then subjected to an esterification reaction, and modified diphenolic acid is obtained; b), modified diphenolic acid, sodium citrate and anhydrous dodecylbenzene sulfonic acid are mixed in water, and a mixed solution is obtained; c), a formaldehyde solution is dropwise added to the mixed solution, the mixed solution is heated to 45-50 DEG C and subjected to a reaction for 0.6-1.3 h, then the mixed solution is continuously heated to 70-95 DEG C and subjected to a reaction for 7-9 h, and an aqueous solution containing a water reducer is obtained. The water reducer provided by the invention contains sulfonate groups and terminal hydroxyl groups with quite good hydrophility, and compared with the prior art, the water reducer has the advantages that liquidity of concrete can be improved and the bleeding performance of the concrete can be greatly improved; meanwhile, compared with sulfonic acid series water reducers in the prior art, the concrete water reducer is high in water recuing rate and low in bleeding rate and is cheaper than a polycarboxylic type water reducer.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to a concrete water reducer and a preparation method thereof. Background technique [0002] Water reducing agent refers to the admixture that can reduce the mixing water consumption and improve the concrete strength under the condition of constant workability and cement dosage of concrete; or save the dosage of cement under the condition of constant workability and strength. [0003] At present, the naphthalene-based and melamine-based high-efficiency water-reducing agents widely used in China have problems such as low water-reducing rate, small slump of concrete, and large loss of slump over time, which have a certain impact on concrete construction. Therefore, it is imperative to develop new high-efficiency water reducers. Sulfamic acid-based high-efficiency water-reducing agent has become a research hotspot in recent years due to its advantages of high water-reducing rate...

Claims

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Application Information

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IPC IPC(8): C08G8/28C04B24/22C04B103/30
CPCC04B24/226C04B2103/302C08G8/28
Inventor 张朝阳
Owner 贵州凯襄新材料有限公司
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