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Multi-sulfonate type cement water reducing agent and preparation method thereof

A polysulfonate and water-reducing agent technology, applied in the field of fine chemicals preparation, can solve the problems of non-conformity with green production, poor water-reducing performance, irritating odor, etc., and achieves low equipment requirements, easy operation, enhanced The effect of dispersion properties

Active Publication Date: 2015-04-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of them are monosulfonic acid groups and disulfonic acid groups, and their water-reducing performance is not good. At the same time, the raw materials are polluted and have pungent odors, which do not meet the requirements of green production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A polysulfonate cement water reducer, its raw material components and consumption are as follows:

[0025] Allyl polyoxyethylene ether with a molecular weight of 500, maleic anhydride, p-toluenesulfonic acid and NaHSO 3 ; Wherein, the mol ratio of maleic anhydride and allyl polyoxyethylene ether is 1.0:2.0; p-toluenesulfonic acid accounts for 0.6% of the total mass of maleic anhydride and allyl polyoxyethylene ether; NaHSO 3 The molar ratio with maleic anhydride is 3.6:1.0.

[0026] The preparation process of the polysulfonate cement water reducer:

[0027] Slowly raise the temperature of allyl polyoxyethylene ether to 50°C for complete liquefaction, then quickly add maleic anhydride and p-toluenesulfonic acid, control the temperature at 100°C, stir continuously for 10 hours, and then dissolve NaHSO 3 Prepare a solution with a mass fraction of 20% and add dropwise, keep the temperature at 80°C, and stir for about 5 hours to prepare the trisulfonic acid-based water red...

Embodiment 2

[0029] A polysulfonate cement water reducer, its raw material components and consumption are as follows:

[0030] Allyl polyoxyethylene ether with a molecular weight of 1500, maleic anhydride, p-toluenesulfonic acid and NaHSO 3 ; Wherein, the mol ratio of maleic anhydride and allyl polyoxyethylene ether is 1.0:2.1; p-toluenesulfonic acid accounts for 0.6% of the total mass of maleic anhydride and allyl polyoxyethylene ether; NaHSO 3 The molar ratio with maleic anhydride is 3.2:1.0.

[0031] The preparation process of the polysulfonate cement water reducer:

[0032] Slowly raise the temperature of allyl polyoxyethylene ether to 60°C and completely liquefy it, then quickly add maleic anhydride and p-toluenesulfonic acid, control the temperature at 110°C, keep stirring for 8 hours, then dissolve NaHSO 3 Prepared as a solution with a mass fraction of 20% and added dropwise ， Keep the temperature at 90°C and stir for about 4 hours to prepare the trisulfonic acid-based water redu...

Embodiment 3

[0034] A polysulfonate cement water reducer, its raw material components and consumption are as follows:

[0035] Allyl polyoxyethylene ether with a molecular weight of 2500, maleic anhydride, p-toluenesulfonic acid and NaHSO 3 ; Wherein, the mol ratio of maleic anhydride and allyl polyoxyethylene ether is 1.0:2.4; p-toluenesulfonic acid accounts for 0.9% of the total mass of maleic anhydride and allyl polyoxyethylene ether; NaHSO 3 The molar ratio with maleic anhydride is 3.4:1.0.

[0036] The preparation process of the polysulfonate cement water reducer:

[0037] Slowly raise the temperature of allyl polyoxyethylene ether to 75°C and completely liquefy it, then quickly add maleic anhydride and p-toluenesulfonic acid, control the temperature at 130°C, keep stirring for 6 hours, then dissolve NaHSO 3 It is prepared as a solution with a mass fraction of 20% and added dropwise, keeping the temperature at 100°C and stirring for about 3 hours to obtain a trisulfonic acid-based w...

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Abstract

The invention discloses a multi-sulfonate type cement water reducing agent and a preparation method thereof, and belongs to the technical field of fine chemical product preparation. The multi-sulfonate type cement water reducing agent is prepared from the following raw materials: allyl polyoxyethylene ether, acid anhydride, a catalyst and NaHSO3. The preparation method comprises the following steps: firstly, mixing allyl polyoxyethylene ether, acid anhydride and the catalyst, heating and continuously stirring to react for 6-10 hours, so as to generate a polymer with double bonds at two ends and the middle part; adjusting the temperature, and dropping NaHSO3, thereby preparing the multi-sulfonate type cement water reducing agent. The preparation method disclosed by the invention is simple and convenient to operate, easy in process control, low in equipment requirement, environment-friendly, and applicable to industrialization large-scale production. The multi-sulfonate type cement water reducing agent prepared by using the method is excellent in water reduction property and dispersion property.

Description

technical field [0001] The invention belongs to the technical field of preparation of fine chemicals, and in particular relates to a polysulfonate cement water reducer and a preparation method thereof. Background technique [0002] At present, according to the water reducing and strengthening ability of the water reducing agent, the water reducing agent can be mainly divided into four categories: one is the ordinary water reducing agent mainly based on lignin, and most of this type of water reducing agent is powdery and low air-entraining Retarder, with micro-air-entraining properties, can improve the anti-seepage freeze-thaw performance of concrete. However, the molecular structure of this type of water reducer is dominated by aromatic rings, and its flexibility is poor. The second is a high-efficiency water-reducer represented by a naphthalene-based water-reducer. This type of water-reducer is favored for its environmental protection and high plasticity. However, due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08G65/00C04B103/30
Inventor 李刚辉樊孟孟宋洁樊文娜
Owner SHAANXI UNIV OF SCI & TECH
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