Low-slump water reducing agent and preparation method thereof

A water reducing agent and slump technology, applied in the field of materials, can solve the problems of not achieving the ideal effect and the sensitivity of joint usage, etc., to achieve improved steric resistance and electrostatic repulsion, excellent water reducing rate, and excellent slump The effect of maintaining performance

Inactive Publication Date: 2021-06-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the water reducer formula of the present invention, a certain amount of additives are added, which can improve the dispersibility, promote the organic reaction, and speed up the efficiency of the reaction, especially 1-ethyl-(3-dimethylaminopropyl) Whether carbodiimide hydrochlori

Method used

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  • Low-slump water reducing agent and preparation method thereof
  • Low-slump water reducing agent and preparation method thereof
  • Low-slump water reducing agent and preparation method thereof

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Embodiment 1

[0041] The total mass fraction of raw materials for preparing the low slump type water reducing agent is 1000 parts, each mass fraction is 1 g in this embodiment, and the mass fractions of each raw material are as follows:

[0042] Polyether alcohol head: 25 parts of propylene glycol monoallyl ether;

[0043] Cyclic monomers: 305 parts of ethylene oxide and propylene oxide, including 130 parts of ethylene oxide and 175 parts of propylene oxide;

[0044] Catalyst: 1 part of boron trifluoride;

[0045] Acid substances: 56 parts of acrylic acid;

[0046] Reducing agent: 4 parts of ascorbic acid;

[0047] Initiator: 4 parts of ammonium persulfate;

[0048] Chain transfer agent: 3 parts of mercaptopropionic acid;

[0049] Neutralizer: 7 parts of sodium carbonate;

[0050] The rest is deionized water.

[0051] The specific operation steps of the preparation method are as follows:

[0052] Step 1: Add 25 parts of propylene glycol monoallyl ether and 1 part of boron trifluoride t...

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Abstract

The invention provides a low-slump water reducing agent and a preparation method thereof. The water reducing agent is mainly prepared from 24.5 to 28.1 parts of alcohol ether, 300.8 to 308.9 parts of a cyclic monomer, 0.5 to 1.6 parts of a catalyst, 55.4 to 56.9 parts of an acid substance, 2.5 to 5.8 parts of a reducing agent, 3.5 to 5.7 parts of an initiator, 4.8 to 8.3 parts of a neutralizing agent, 1.2 to 3.3 parts of a chain transfer agent and the balance of deionized water. The preparation method comprises the following steps: firstly preparing a polyether monomer, designing the acid-ether ratio of the water reducer according to the molecular weight of the prepared polyether, and introducing a polar functional group with strong adsorbability into polycarboxylic acid molecules through a free radical polymerization method by utilizing the advantage of strong designability of the molecular structure of the polycarboxylic acid, thereby ensuring the excellent adsorption and dispersion performance of the water reducer; and synthesizing the excellent low-slump water reducing agent.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a preparation technology of a water reducer, in particular to a low slump type water reducer and a preparation method thereof. Background technique [0002] With the continuous development of China's economy, my country's concrete technology has also been greatly improved. Through the continuous efforts of scientific researchers, a variety of new concrete materials have been launched. As an indispensable part of concrete, water reducing agent is also developed in a leap. In the past, concrete water reducing agent was rarely used in the construction of highways, but now the national concrete durability control is becoming more and more strict, which has prompted The strength of concrete admixture promotion. [0003] Patent CN202010635498.4 discloses a preparation method of a water-reducing agent for cement with slump-preserving performance. After grinding the water-soluble water-reducing a...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B103/30
CPCC04B24/2647C04B2103/302C08F283/065C08F220/06
Inventor 李相国张乘吕阳蹇守卫柯凯傅秋艳
Owner WUHAN UNIV OF TECH
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