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Preparation method for polyphosphate water-reducing agent

A technology of polyphosphate ester and water reducer, which is applied in the field of preparation of polyphosphate ester water reducer, can solve the problems of hindering the adsorption of water reducer and cement, the volatile environment of carboxylic acid, and the limitation of work performance, etc. Harsh, inexpensive, low-cost-to-produce effects

Inactive Publication Date: 2016-08-10
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unreacted small monomer organic carboxylic acid in the polycarboxylate superplasticizer is volatile and will cause environmental pollution; the side chain of the electrically neutral polyvinyl alcohol unit in its molecular structure will hinder the adsorption of the superplasticizer and cement, which It will cause part of the polycarboxylate superplasticizer to be free in the concrete, which limits its working performance

Method used

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  • Preparation method for polyphosphate water-reducing agent
  • Preparation method for polyphosphate water-reducing agent

Examples

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Embodiment 1

[0018] In the preparation of the polyphosphate water reducing agent in this example: the molar ratio of isopentenol polyoxyethylene ether and pyrophosphoric acid is 1:1, the phosphate esterification reaction temperature is 80°C, and the reaction time is 12h; the free radical homopolymerization temperature is 80°C, the mass of the initiator ammonium persulfate is 2% of the mass of the monomer, the mass of the regulator mercaptopropionic acid is 1% of the mass of the monomer, the dripping time is 2h, and the temperature is kept for 1h. The specific preparation process is:

[0019] Accurately weigh 24g of isopentenol polyoxyethylene ether (Mn=2400) and 1.98g of pyrophosphoric acid in a 100mL three-necked flask, fix it in an oil bath at 80°C, pass nitrogen for 30min, and then react in a closed and constant temperature for 12h, the reaction ends Then add 10g deionized water;

[0020] Weigh 0.48g of ammonium persulfate and 0.24g of mercaptopropionic acid and dissolve them in 10g of...

Embodiment 2

[0026] In the preparation of the polyphosphate water reducing agent in this example: the molar ratio of isopentenol polyoxyethylene ether and pyrophosphoric acid is 1:1, the phosphate esterification reaction temperature is 80°C, the reaction time is 12h, and the radical polymerization temperature is 80° C., the mass of the initiator ammonium persulfate is 1% of the mass of the monomer, the mass of the regulator mercaptopropionic acid is 1% of the mass of the monomer, the dripping time is 2h, and the temperature is kept for 1h. The specific preparation process is:

[0027] Accurately weigh 24g of isopentenol polyoxyethylene ether (Mn=2400) and 1.98g of pyrophosphoric acid in a 100mL three-necked flask, fix it in an oil bath at 80°C, pass nitrogen for 30min, and then react in a closed and constant temperature for 12h, the reaction ends Then add 10g deionized water;

[0028] Weigh 0.24 g of ammonium persulfate and 0.24 g of mercaptopropionic acid and dissolve them in 10 g of dei...

Embodiment 3

[0034] In the preparation of the polyphosphate water reducing agent in this example: the molar ratio of isopentenol polyoxyethylene ether and pyrophosphoric acid is 1:1, the phosphate esterification reaction temperature is 80°C, and the reaction time is 12h; the radical polymerization temperature is 80° C., the mass of the initiator ammonium persulfate is 1% of the mass of the monomer, the mass of the regulator mercaptopropionic acid is 0.8% of the mass of the monomer, the dripping time is 2h, and the temperature is kept for 1h. The specific preparation process is:

[0035] Accurately weigh 24g of isopentenol polyoxyethylene ether (Mn=2400) and 1.98g of pyrophosphoric acid in a 100mL three-necked flask, fix it in an oil bath at 80°C, pass nitrogen for 30min, and then react in a closed and constant temperature for 12h, the reaction ends Then add 10g deionized water;

[0036] Weigh 0.24 g of ammonium persulfate and 0.192 g of mercaptopropionic acid and dissolve them in 10 g of ...

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Abstract

The invention discloses a preparation method for a polyphosphate water-reducing agent. The preparation method is characterized by comprising the following steps: subjecting isoamylenol polyoxyethylene ether and pyrophosphoric acid to a phosphate esterification reaction so as to obtain isoamylenol polyoxyethylene ether phosphate monomer; and then with ammonium persulfate as an initiator and mercaptopropionic acid as a conditioning agent, carrying out free radical homopolymerization in an aqueous solution so as to obtain the polyphosphate water-reducing agent. The preparation method is simple; a single, cheap and low-cost raw material is used in the method; and the obtained polyphosphate water-reducing agent is nonvolatile and basically nontoxic, and has good biodegradability, a water-reducing rate and slump loss resistance.

Description

Technical field [0001] The present invention involves a preparation method for a high -performance concrete exterior agent. Specifically, it is a preparation method for a polyphothexal water reduction agent. Background technique [0002] In today's concrete engineering, foreign additives have become an indispensable part, and the most important water reduction agent is most important in external agents.This is because the water reducing agent can significantly increase the liquidity of concrete, reduce the amount of water, and increase the strength of the concrete under low doping.The development of water reducing agents has developed to the third -generation polycarboxylic acid water reducing agent, and the synthesis of polycarboxylic acid water reduction agent requires at least two basic monomers: one of which is called small monomer, which provides carboxyl group to make it to make the carboxyl group to make it to make the carboxyl group to make the carboxyl group to makeThe w...

Claims

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Application Information

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IPC IPC(8): C08F299/02C08G65/327C04B24/26C04B103/30
CPCC04B24/246C04B2103/302C08F299/022C08G65/327
Inventor 王文平邢国兵
Owner HEFEI UNIV OF TECH
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