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Method for preparing modified aliphatic series water reducing agent

An aliphatic water reducer and modification technology, which is applied in the field of chemical building materials, can solve the problems of industrial application limitations, high production costs, and rapid loss of aliphatic water reducers over time, so as to improve slump retention performance and production costs Decline, the effect of good industrial application prospects

Active Publication Date: 2015-01-21
科之杰新材料集团河南有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method has improved the problem of rapid loss of aliphatic water reducers to a certain extent, the production cost is high and the industrial application is limited

Method used

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  • Method for preparing modified aliphatic series water reducing agent
  • Method for preparing modified aliphatic series water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) In parts by mass, add 30 parts of sodium bisulfite, 130 parts of formaldehyde and 70 parts of water to the first reaction kettle, stir and dissolve for 0.5 hours, and when the temperature is controlled below 30°C, add 40 parts of waste acetone at one time and 15 parts of pure acetone, after continuing to react for 0.5 hours, add 1 part of polyethylene glycol and 2 parts of propylene glycol to obtain the first mixed solution; in the above-mentioned waste acetone, the content of acetone is 85-95%, and the rest are impurities, and the impurities including pyruvic acid, unsaturated resins, oils and rosin resins;

[0024] (2) In parts by mass, in the second reaction kettle, add 30 parts of sodium sulfite and 100 parts of water, stir to dissolve, add liquid caustic soda to adjust the pH to 12, and control the reaction temperature to 40-50°C, and pour the Add the above-mentioned first mixed solution dropwise within 2 hours, and control the temperature not to exceed 90°C; ...

Embodiment 2

[0027] (1) In parts by mass, add 25 parts of sodium bisulfite, 120 parts of formaldehyde and 70 parts of water into the first reaction kettle, stir and dissolve for 0.5 hours, and when the temperature is controlled below 30°C, add 30 parts of waste acetone at one time and 20 parts of pure acetone, after continuing to react for 0.5 hours, add 2 parts of dimethylacetamide and 1 part of ethylenediamine to obtain the first mixed solution; in the above-mentioned waste acetone, the content of acetone is 85% to 95%, and the rest is Impurities, and impurities include pyruvic acid, unsaturated resins, oils and rosin resins;

[0028] (2) In parts by mass, in the second reaction kettle, add 40 parts of sodium pyrosulfate and 100 parts of water, stir to dissolve, add liquid alkali to adjust the pH to 12, and control the reaction temperature to 40-50°C, add Add the above-mentioned first mixed solution dropwise within 2 hours at a constant speed, and control the temperature not to exceed 90...

Embodiment 3

[0031] (1) In parts by mass, add 40 parts of sodium bisulfite, 140 parts of formaldehyde and 70 parts of water to the first reaction kettle, stir and dissolve for 0.5 hours, and when the temperature is controlled below 30°C, add 60 parts of waste acetone at one time After continuing to react for 0.5 hours, add 3 parts of polyethylene glycol to obtain the first mixed solution; in the above-mentioned waste acetone, the content of acetone is 85-95%, and the rest are impurities, and the impurities include pyruvic acid, unsaturated resin, Fats and rosin resins;

[0032] (2) In parts by mass, in the second reaction kettle, add 20 parts of sodium pyrosulfate, 15 parts of sodium sulfite and 100 parts of water, stir to dissolve, add liquid alkali to adjust the pH to 12, and control the reaction temperature to 40-50 °C, add the above-mentioned first mixed solution dropwise within 2 hours at a constant speed, and control the temperature not to exceed 90 °C;

[0033] (3) After the first ...

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Abstract

The invention discloses a method for preparing a modified aliphatic series water reducing agent. The method comprises the following steps: (1) adding 25-45 parts of sodium hydrogen sulfite,120-150 parts of formaldehyde and 70 parts of water into a first reaction kettle, stirring to dissolve for 0.5-1 hour, adding 30-70 parts of waste acetone and 10-25 parts of pure acetone into the reaction kettle at one time when the temperature is controlled to be less than 30 DEG C, continuously reacting for 0.5-1 hour, and further adding 1-5 parts of a stabilizing agent, thereby obtaining a first mixed liquid; (2) adding 20-35 parts of sulfite and 100 parts of water into a second reaction kettle, stirring to dissolve, adding liquid caustic soda to adjust the pH value to be 11-12, controlling the reaction temperature to be 40-55 DEG C, dripping the first mixed liquid within 2 hours at a uniform speed, and controlling the temperature to be no greater than 90 DEG C; and (3) after the first mixed liquid is dripped, adding 30-50 parts of CLT waste acid and 2-3 parts of formaldehyde into the second reaction kettle, carrying out heat preservation for 2-3 hours, and cooling to be the room temperature, thereby obtaining the modified aliphatic series water reducing agent. By adopting the method disclosed by the invention, the production cost is greatly lowered while the property of the water reducing agent is not degraded, so that the competitiveness of the product is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical building materials, and in particular relates to a preparation method of a modified aliphatic water reducer. Background technique [0002] Concrete is one of the main building materials in the construction industry and the most widely used artificial material in the world. With the large-scale development of national railways, highways, bridges and other infrastructure construction, the demand for concrete continues to rise, and it also promotes the rapid development of admixtures. At present, the most widely used concrete admixture is the water reducer. [0003] Aliphatic water reducer is a new type of water reducer developed in the 1980s. It uses acetone, formaldehyde, sulfite, etc. as the main raw materials, and condenses under alkaline conditions to form a certain molecular weight through the generation of carbanions. Hydrophobic hydrocarbon main chain; through the sulfonation reaction to o...

Claims

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Application Information

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IPC IPC(8): C04B24/22C04B103/30
Inventor 赖华珍方云辉赖广兴温庆如邱有陶
Owner 科之杰新材料集团河南有限公司
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