Four-dropwise addition method for preparing high-water reduction and slump loss-resistant polycarboxylic water reducer

A technology of polycarboxylic acid and water reducing agent, applied in the field of polycarboxylic acid water reducing agent, can solve the problems of reduced initiation efficiency, poor reactivity, and ignorance of the half-life of oxidants, and achieves the effect of ensuring uniformity and molecular weight distribution.

Active Publication Date: 2018-04-20
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The double-dropping mode generally puts the oxidizing agent directly at the bottom of the kettle, and the reducing agent and the small monomer solution are added dropwise in batches. This traditional dropping method does not consider the half-life of the oxidizing agent, and the reactivity is poor. Th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A four-drop method for preparing a high water-reducing and slump-preserving polycarboxylate superplasticizer, which is formed by polymerizing the following components, the mass fraction of the finished mother liquor is 40%, and the total mass parts are 1000. The specific steps are as follows:

[0030] 1) Add 340 parts of allyl polyoxyethylene ether and 200 parts of water into the reaction kettle, stir until the solution has no obvious lumps or flakes; measure the temperature in the kettle, control the initial temperature at 17°C, and put in 0.05 Part of ammonium persulfate and 0.0001 part of ferrous sulfate heptahydrate;

[0031] 2) After 5 minutes, start dropping the reducing chain transfer complex agent solution and the oxidizing agent solution simultaneously; the reducing chain transfer complex agent solution is composed of 0.5 parts of sodium formaldehyde sulfoxylate, 1.0 parts of mercaptoethanol and 50 parts of water; the oxidizing agent solution is composed of 2.0 ...

Embodiment 2

[0036] A four-drop method for preparing a high water-reducing and slump-preserving polycarboxylate superplasticizer, which is formed by polymerizing the following components, the mass fraction of the finished mother liquor is 40%, and the total mass parts are 1000. The specific steps are as follows:

[0037] 1) Add 345 parts of methallyl polyoxyethylene ether and 220 parts of water into the reaction kettle, stir until the solution has no obvious lumps or flakes; measure the temperature in the kettle, control the initial temperature at 20°C, and make a one-time Drop into 0.1 part of potassium persulfate and 0.0002 part of ferrous sulfate heptahydrate;

[0038] 2) After 5 minutes, synchronously start dropping the reduction chain transfer complex agent solution and the oxidant solution; the reduction chain transfer complex agent solution is composed of 0.6 parts of ascorbic acid, 1.5 parts of thioglycolic acid and 55 parts of water; the oxidant solution is composed of 3.0 parts of...

Embodiment 3

[0043] A four-drop method for preparing a high water-reducing and slump-preserving polycarboxylate superplasticizer, which is formed by polymerizing the following components, the mass fraction of the finished mother liquor is 40%, and the total mass parts are 1000. The specific steps are as follows:

[0044] 1) Add 350 parts of isopentenol polyoxyethylene ether and 235 parts of water into the reaction kettle, stir until the solution has no obvious lumps or flakes; measure the temperature in the kettle, control the initial temperature at 20°C, and put it in at one time 0.15 parts of potassium persulfate and 0.0003 parts of ferrous sulfate heptahydrate;

[0045] 2) After 5 minutes, synchronously start dropping the reduction chain transfer complex agent solution and the oxidant solution; the reduction chain transfer complex agent solution is composed of 0.8 parts of ascorbic acid, 1.8 parts of mercaptopropionic acid and 60 parts of water; the oxidant solution is composed of 3.5 pa...

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Abstract

The invention discloses a four-dropwise addition method for preparing a high-water reduction and slump loss-resistant polycarboxylic water reducer. The four-dropwise addition method comprises the following preparation steps: 1), placing a polyether macromonomer and water into the bottom of a kettle, stirring until a solution has no significant block material or sheet material, and adding an inorganic peroxygen initiator and a trace amount of ferrous sulfate when the initial temperature is lower than or equal to 22 DEG C; 2), 5min later, simultaneously starting to dropwise add a reducing chaintransfer compound solution and an oxidizer solution for a hour; 3), 5min later, starting to dropwise add a small monomer solution for a-0.5 hour; 4), 20min later, starting to dropwise add a liquid caustic soda solution for a+0.5 hour; 5) after dropwise addition of the liquid caustic soda solution, preserving heat for 0.5-2.0 hours, stopping stirring to obtain a finished mother solution. The polycarboxylic water reducer has the dual characteristics of high water reduction and high slump loss resistance, is strong in adaptability, and can significantly improve the slump loss resistance, the cohesiveness and the flowing retention ability of freshly mixed concrete.

Description

technical field [0001] The invention relates to the technical field of a polycarboxylate water-reducer, in particular to a preparation method of a high-water-reducing and slump-preserving polycarboxylate water-reducer by a four-drop method. Background technique [0002] Concrete water reducer is the fifth component of concrete. It is mainly polycarboxylate water reducer. It has the advantages of high water reducing rate and good slump retention. The synthesis process is simple, the production process is free of pollutants, and it is green. Environmentally friendly and cost-effective. At present, there are many factors that affect the working state of concrete, such as sand, cement, and mineral admixtures; correspondingly, concrete admixtures fluctuate greatly. If the molecular weight of the water reducing agent is too small, it is easy to be consumed, and if the molecular weight of the water reducing agent is too large, it is difficult to be absorbed. According to differen...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F4/40C08F2/38C04B24/26
CPCC04B24/2605C04B2103/302C08F283/065C08F220/06C08F4/40C08F2/38
Inventor 柯凯何鹏浩王迎斌谌援
Owner HUBEI UNIV OF TECH
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