Preparation method for sulfate-compatible polycarboxylic water reducer

A polycarboxylic acid-based and sulfate technology is applied in the preparation of water-reducing agents, and in the field of sulfate-compatible polycarboxylic acid-based water-reducing agents, which can solve the problem of increasing application costs and increasing a large number of polycarboxylic acid-based water-reducing agents. Popularization and application, etc., to achieve the effect of good adaptability, high cost performance, simple and easy-to-control preparation process

Active Publication Date: 2015-05-06
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of sulfate compatibility has greatly increased the popularization and application of polycarboxylate water reducer in concrete, and also increased its application cost, so it needs to be improved urgently

Method used

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  • Preparation method for sulfate-compatible polycarboxylic water reducer
  • Preparation method for sulfate-compatible polycarboxylic water reducer
  • Preparation method for sulfate-compatible polycarboxylic water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of terpolymer: Add 292.8 parts of 2-acrylamide-2-methylpropanesulfonic acid and 258 parts of water in a four-necked flask equipped with stirrer, thermometer, water separator and nitrogen pipe Stir and dissolve at 35°C-40°C, then add 146 parts of liquid caustic soda to adjust the pH value to 7-7.5, add 3.3 parts of sodium lauryl sulfate and 26.6 parts of p-methylstyrene; stir for 0.5 hours while feeding nitrogen, and 13.3 parts of methacrylamide and 80 parts of water are premixed into 1 # Mixed solution; 12.4 parts of ammonium persulfate and 7.6 parts of sodium metabisulfite plus 160 parts of water are made into 2 # Mixed solution; drop the two mixed solutions at the same time at 38°C-40°C, drop them at a constant rate within 2h-3h; continue to keep warm at 38°C-40°C for 4h-6h after dropping; the terpolymer is obtained.

[0025] (2) Preparation of sulfate-compatible polycarboxylate water reducer: Add 42.6 parts of the prepared terpolymer, 416.7 parts of ...

Embodiment 2

[0027] (1) Preparation of terpolymer: Add 289.4 parts of 2-acrylamide-2-methylpropanesulfonic acid and 224 parts of water in a four-necked flask equipped with stirrer, thermometer, water separator and nitrogen pipe Stir and dissolve at 35℃~40℃, then add 193.5 parts of liquid caustic soda to adjust the pH value to 7~7.5, add 3.2 parts of sodium lauryl sulfate and 19.3 parts of styrene; Amide and 80 parts of water are pre-mixed into 1 # Mixed solution; 12.2 parts of sodium persulfate and 5.5 parts of sodium bisulfite plus 160 parts of water are made into 2 # Mixed solution; drop the two mixed solutions at the same time at 38°C-40°C, drop them at a constant rate within 2h-3h; continue to keep warm at 38°C-40°C for 4h-6h after dropping; the terpolymer is obtained.

[0028] (2) Preparation of sulfate-compatible polycarboxylate water-reducer: Add 53.2 parts of the prepared terpolymer and 415.7 parts of isopentenyl polyoxyethylene to a four-necked flask equipped with a stirrer and a...

Embodiment 3

[0030] (1) Preparation of terpolymer: Add 277.4 parts of 2-acrylamide-2-methylpropanesulfonic acid and 234 parts of water in a four-necked flask equipped with stirrer, thermometer, water separator and nitrogen pipe Stir and dissolve at 35°C to 40°C, then add 180.2 parts of liquid caustic soda to adjust the pH to 7 to 7.5, add 2.9 parts of sodium lauryl sulfate and 22.6 parts of p-methylstyrene; stir for 0.5 hours while feeding nitrogen, and 22.6 parts of acrylamide and 80 parts of water are premixed into 1 # Mixed solution; 14.2 parts of ammonium persulfate and 6.1 parts of sodium metabisulfite plus 160 parts of water are made into 2 # Mixed solution; drop the two mixed solutions at the same time at 38°C-40°C, drop them at a constant rate within 2h-3h; continue to keep warm at 38°C-40°C for 4h-6h after dropping; the terpolymer is obtained.

[0031](2) Preparation of sulfate-compatible polycarboxylate water reducer: Add 70.4 parts of the prepared terpolymer, 393.2 parts of met...

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Abstract

The invention relates to a preparation method for a sulfate-compatible polycarboxylic water reducer, and belongs to the field of cement concrete water reducers. The preparation method comprises the following specific steps: firstly, under the action of lauryl sodium sulfate and an initiator, preparing terpolymer from 2-acrylamide-2-methyl propane sulfonic acid, a vinyl aromatic compound monomer A and an unsaturated amide monomer B; secondly, under the action of a redox system initiator and a chain transfer agent, producing an aqueous-phase free radical polymerization reaction of the terpolymer, a polyoxyethylene-polyoxypropylene copolymer monomer C, an unsaturated carboxylic monomer D and a silane coupling agent monomer E, and after finishing the reaction, regulating the pH (potential of hydrogen) value to prepare the sulfate-compatible polycarboxylic water reducer. The sulfate-compatible polycarboxylic water reducer prepared with the method has the advantages of high cost performance, simplicity for reaction, easiness for control, strong cement adaptability and the like, and is polymerized in an aqueous solution and free of 'three-waste' emission, thereby belonging to clean production.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, in particular to a sulfate-compatible polycarboxylate water reducer, and in particular to a preparation method of the water reducer. Background technique [0002] Concrete is the largest and most widely used building material in the world. With the full development of my country's infrastructure construction, the amount of concrete used in railways, highways, bridges and other buildings has greatly increased, and the requirements for modern concrete technology are also getting higher and higher. High performance concrete with high water reducing rate, low slump loss, high strength and super high strength is the direction of concrete development. As the fifth component of concrete, water reducer is required to have higher performance in order to adapt to the development of concrete technology. Polycarboxylate superplasticizer has the characteristics of high wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/58C08F212/12C08F220/56C08F220/54C04B24/16C04B103/30
Inventor 陈国新祝烨然黄国泓王冬杜志芹刘兴荣蔡明付丹华王凤
Owner NANJING HYDRAULIC RES INST
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