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Polycarboxylate-type water reducing agent

A weak acid and catalyst technology, applied in the field of building materials, to achieve the effect of ensuring dispersion retention, increasing steric hindrance effect, and enhancing slump retention

Inactive Publication Date: 2014-08-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, relying solely on the steric hindrance provided by the special structure of the branched methyl group still cannot make the synthesized polycarboxylate superplasticizer have the best ability to maintain the dispersion of cement particles

Method used

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  • Polycarboxylate-type water reducing agent

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: The 30L autoclave was first rinsed with distilled water. After drying the reactor, it is cooled to room temperature, and in the reactor, add 6000 g of prenol polyoxyethylene ether with a molecular weight of 1000 and 50 g of powdered sodium methylate, and use an inert gas N 2 Replace the air in the reactor. Raise the temperature in the reactor to 90°C to carry out the dealcoholization reaction. Observe the vacuum degree in the reactor, and start to add 6000g of ethylene oxide when the reactor is in vacuum. This process keeps the temperature in the reactor at 130°C, and the flow control is completed within 2 hours. Keep the temperature in the reactor constant, continue to add 3600g propylene oxide in the reactor, and the flow control is completed in 1 hour. Raise the temperature of the reactor to 145° C., add the remaining 14500 g of ethylene oxide into the reactor, and control the flow rate in 3.5 hours to complete. Heat preservation and aging until the ...

Embodiment 2

[0037] Embodiment 2: First, the 30L autoclave was rinsed with distilled water. After drying the reactor, it is cooled to room temperature, and in the reactor, add 6000 g of prenol polyoxyethylene ether with a molecular weight of 1000 and 50 g of powdered sodium methylate, and use an inert gas N 2 Replace the air in the reactor. Raise the temperature in the reactor to 90°C to carry out the dealcoholization reaction. Observe the vacuum degree in the reactor, and start to add 3120g of ethylene oxide when the reactor is in vacuum. This process keeps the temperature in the reactor at 130° C., and the flow control is completed in 1.5 hours. Keep the temperature in the reactor constant, continue to add 1875g propylene oxide in the reactor, and the flow control is completed in 1 hour. Raise the temperature of the reactor to 145° C., add the remaining 7540 g of ethylene oxide into the reactor, and control the flow rate in 2.5 hours to complete. Heat preservation and aging until the ...

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Abstract

The invention discloses a water reducing agent raw material, namely an ethylene oxide-propylene oxide ternary-block polyether macromonomer, as well as a water reducing agent prepared from the raw material. The preparation of the water reducing agent comprises the following processes: mixing iso-pentenol polyoxyethylene ether and a sodium alcoholate catalyst, heating to 80-115 DEG C and dealcoholizing; heating to 110-130 DEG C, controlling pressure to be 0.25-0.40Mpa and adding ethylene oxide; adding propylene oxide at unchanged system temperature and unchanged pressure; heating to 130-160 DEG C, controlling pressure to be 0.35-0.60Mpa, and adding ethylene oxide again; and after reaction, adding a weak acid neutralizer, thereby obtaining the ethylene oxide-propylene oxide ternary-block polyether macromonomer. Due to the use of a ternary-block system, the functional adjustment on a branched chain is easy to perform, and the adaptability and the slump loss resistance of a polycarboxylate-type water reducing agent monomer are enhanced greatly.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a water reducer raw material ethylene oxide-propylene oxide tertiary block polyether macromonomer, and the water reducer prepared therefrom. Background technique [0002] In recent years, the research and production of concrete admixtures have tended to develop in the direction of high performance and pollution-free. Concrete water reducer is the most widely used and most widely used concrete admixture. The polycarboxylate high-efficiency water reducer with comb-shaped molecular structure is suitable for the preparation of high-strength and ultra-high-strength concrete because of its high water-reducing rate, good slump retention performance, low dosage, no pollution, less retarding time, and low cost. , high fluidity and self-compacting concrete has become a hot spot in the research and development of concrete admixtures at home and abroad. The main dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C04B24/32C04B103/30
Inventor 马保国戚长亚方晨炜黄健谭洪波汪杰代柱端
Owner WUHAN UNIV OF TECH
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