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Preparation method of slump retaining type aliphatic water reducing agent

An aliphatic water-reducing agent and slump-preserving technology, which is applied in the field of preparation of slump-preserving aliphatic water-reducing agents, can solve the problems of low dosage, low sodium sulfate content, poor slump-preserving performance and adaptability, etc. Good, prevent hydration, improve the effect of slump retention

Active Publication Date: 2014-12-24
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

The aliphatic water reducer in the prior art has the characteristics of low dosage, low sodium sulfate content (less than 1%), no crystallization in winter, and no corrosion to steel bars. It belongs to the early strength non-air-entraining water reducer, but its retention Poor slump performance and adaptability

Method used

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  • Preparation method of slump retaining type aliphatic water reducing agent
  • Preparation method of slump retaining type aliphatic water reducing agent
  • Preparation method of slump retaining type aliphatic water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) prepare modified starch ether, specifically as follows:

[0037] a, get starch, add water and be mixed with the starch milk that the weight percentage composition of starch is 30%;

[0038] b. Add concentrated sulfuric acid with 3% starch weight in starch milk, stir evenly, then slowly add potassium permanganate solution with a concentration of 5%, wherein the amount of potassium permanganate added is 6% starch weight, at 35°C Stir and react for 3 hours at a certain temperature, add precipitant methanol after the solution becomes pure white, pour the precipitate and solution into a sand core crucible for vacuum filtration, and wash repeatedly with methanol for 3 times, and dry the filter cake at 40°C , to produce oxidized starch;

[0039] c. Disperse the oxidized starch in absolute ethanol, prepare a suspension with a weight percentage of oxidized starch of 30%, adjust the pH value of the suspension to 9 with lye, and then add ethylene oxide and anhydrous ethanol t...

Embodiment 2

[0046] (1) prepare modified starch ether, specifically as follows:

[0047] A, get starch, add water and be mixed with the starch milk that the weight percentage composition of starch is 35%;

[0048] b. Add concentrated sulfuric acid with 2% starch weight in starch milk, stir evenly, then slowly add hydrogen peroxide solution with a concentration of 35%, wherein the amount of hydrogen peroxide added is 5% starch weight, at a temperature of 40°C Stir and react for 3 hours, add precipitant methanol after the solution becomes pure white, pour the precipitate and solution into a sand core crucible for vacuum filtration, and wash repeatedly with methanol for 3 times, and dry the filter cake at 40°C with air blast to prepare get oxidized starch;

[0049] c. Disperse the oxidized starch in absolute ethanol, prepare a suspension with a weight percentage of oxidized starch of 30%, adjust the pH value of the suspension to 10 with lye, then add ethylene oxide and absolute ethanol to mi...

Embodiment 3

[0056] (1) prepare modified starch ether, specifically as follows:

[0057] A, get starch, add water and be mixed with the starch milk that the weight percentage composition of starch is 40%;

[0058] b. Add concentrated sulfuric acid with 3% starch weight in starch milk, stir evenly, then slowly add sodium hypochlorite solution with a concentration of 9%, wherein the amount of sodium hypochlorite added is 10% starch weight, and stir for 3 hours at a temperature of 40°C , after the solution becomes pure white, add methanol as a precipitating agent, pour the precipitate and solution into a sand core crucible for vacuum filtration, and repeatedly wash with methanol for 3 times, and dry the filter cake at 40°C by blowing air to obtain oxidized starch;

[0059] c. Disperse the oxidized starch in absolute ethanol, prepare a suspension with a weight percentage of oxidized starch of 30%, adjust the pH value of the suspension to 10 with lye, then add ethylene oxide and absolute ethano...

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Abstract

The invention discloses a preparation method of a slump retaining type aliphatic water reducing agent. The preparation method comprises the following steps: (1) preparing modified starch ether; (2) uniformly mixing the modified starch ether prepared in the step (1) with an aliphatic water reducing agent to obtain the slump retaining type aliphatic water reducing agent, wherein the weight of the modified starch ether is 2-10% of the aliphatic water reducing agent. In the method disclosed by the invention, the prepared modified starch ether contains a lot of hydroxyl to prevent hydration of cement; furthermore, the cold water solubility of the modified starch ether is lower than that of the aliphatic water reducing agent, the molecular weight of the modified starch ether is large, and the modified starch ether can be slowly dissolved and completely clad in an alkaline environment, so that the slump retaining property of the aliphatic water reducing agent can be improved, and the water reducing agent can still keep a high fluidity after two hours, and is convenient to transport and construct.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of a slump-retaining aliphatic water reducer. Background technique [0002] Aliphatic water reducer is an anionic polymer surfactant prepared by sulfonation and condensation with ketone compounds, aldehyde compounds, sulfites, etc. as the main raw materials. The aliphatic water reducer in the prior art has the characteristics of low dosage, low sodium sulfate content (less than 1%), no crystallization in winter, and no corrosion to steel bars. It belongs to the early strength non-air-entraining water reducer, but its retention The slump performance and adaptability are poor. Contents of the invention [0003] The purpose of the present invention is to overcome the defects of the prior art and provide a method for preparing a slump-retaining aliphatic water reducer. [0004] Concrete technical scheme of the present invention is as fo...

Claims

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Application Information

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IPC IPC(8): C04B24/38C08B31/12C04B103/30
Inventor 赖广兴方云辉赖华珍刘金枝
Owner 科之杰新材料集团河南有限公司
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