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Plastic retaining type polyether assemblage carboxylic acid high-performance water reducing agent and preparation method thereof

A technology of polyether and polycarboxylic acid, which is applied in the field of concrete high-performance water reducer, plastic-retaining polyether polycarboxylate high-performance water reducer and its preparation, and can solve the problem of small initial slump of concrete and initial Dispersion ability is not strong, the water reducing rate of the water reducing agent is low, etc., to achieve the effect of small loss of slump and expansion, good dispersion and retention performance, and high water reducing rate

Active Publication Date: 2010-07-28
CNBM ZHONGYAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts the initiator of oxidation-reduction system, which greatly improves the initiation efficiency, and the process is simple, but because no chain transfer agent is added to adjust the molecular weight of the polymer, the molecular weight of the product is too large, and the water reducing rate of the water reducing agent is relatively low. Low, weak initial dispersion ability, the initial slump of concrete prepared with it is small

Method used

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  • Plastic retaining type polyether assemblage carboxylic acid high-performance water reducing agent and preparation method thereof
  • Plastic retaining type polyether assemblage carboxylic acid high-performance water reducing agent and preparation method thereof
  • Plastic retaining type polyether assemblage carboxylic acid high-performance water reducing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0079] Add 272.4g deionized water, 1200g methyl alkenyl polyoxyethylene ether (molecular weight is 2400), 7.2g acrylic acid, 196g maleic anhydride in the glass flask that is equipped with stirrer, thermometer, dropping device, reflux cooler and 14.4g sodium propylene sulfonate, stirred and heated up to 80°C, dissolved 7.1g potassium persulfate in 702.9g deionized water to prepare a 1% concentration initiator solution, and added 497g once at 80°C to the above-mentioned glass flask Initiator solution, react at a constant temperature at 80°C for 1 hour, then add the remaining initiator solution at one time, react at a constant temperature at 80°C for 1 hour, cool to 40°C after the reaction, add 30% sodium hydroxide aqueous solution to adjust the pH value to 5 , adjusting the concentration of the polymer to 40%, to obtain the plastic-retaining polyether polycarboxylate high-performance water reducer of the embodiment of the present invention, code-named PC-1.

Embodiment 2

[0081] Add 100g of deionized water, 60g of methyl alkenyl polyoxyethylene ether (molecular weight is 4800), 360g of allyl polyoxyethylene ether in a glass flask equipped with a stirrer, thermometer, dropping device, and reflux cooler (molecular weight is 2400), 180g allyl polyoxyethylene ether (molecular weight is 1200) and 48g methallyl sulfonic acid, stirring is heated up to 70 ℃, and 171g ammonium persulfate is dissolved in 969g deionized water and is formulated into 15 The initiator solution of % concentration, 480g hydroxypropyl methacrylate, 12g citraconic anhydride and 20g deionized water are mixed with mixed monomer solution, at 70 ℃, in above-mentioned glass flask, drip initiator solution and Mix the monomer solution, drop it in 4 hours, react at a constant temperature at 70°C for 4 hours, cool to 45°C after the reaction, add 30% sodium hydroxide aqueous solution to adjust the pH value to 6, adjust the concentration of the polymer to 40%, and obtain this product The p...

Embodiment 3

[0083] Add 110g of deionized water, 540g of methyl alkenyl polyoxyethylene ether (molecular weight is 1200), 60g of allyl polyoxyethylene ether in a glass flask equipped with stirrer, thermometer, dropping device, and reflux cooler (molecular weight is 2400), 72g sodium methacrylate, stir and heat up to 65 ℃, 25.5g ammonium persulfate is dissolved in 156.5g deionized water and is mixed with the initiator solution of 14% concentration, 200g fumaric acid, 400g Itaconic acid and 2.4g of acrylic acid were dissolved in 843.6g of deionized water to prepare a mixed monomer solution. At 65°C, the initiator solution and the mixed monomer solution were simultaneously added dropwise at a controlled rate in the above glass flask, and the dripping was completed in 3 hours, 65 ℃ for 2 hours at a constant temperature, cooled to 35 ℃ after the reaction, added ethylenediamine to adjust the pH value to 7, and adjusted the concentration of the polymer to 40%, to obtain the plastic-retaining polye...

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Abstract

The invention discloses a plastic retaining type polyether assemblage carboxylic acid high-performance water reducing agent and a preparation method thereof, mainly being applicable to the field of building materials. The water reducing agent is obtained in the following method: with the action of initiating agent, copolymerizing unsaturated polyalkyl ether monomer (A), unsaturated monocarboxylic acid and derivative monomer thereof (B), unsaturated dicarboxylic acid and derivative monomer thereof (C) and unsaturated sulfonic acid or salt monomer (D) in water solution for 2-8h at 50-80 DEG C and then reducing temperature to 35-45 DEG C, using alkaline solution to neutralize the mixture to a pH value of 5-7, thus obtaining the water reducing agent. The synthesized water reducing agent of the invention features changeable molecular structure, high water reducing ratio, high dispersion property under low dosage and fine slumps-retaining property, good adaptability to concrete raw material; in addition concrete with the water reducing agent added enjoys good peaceability; with the one-step method synthesis technology employed, the preparation method has the advantages of simple operation, low energy consumption in production and freedom from pollution.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to a high-performance water reducer for concrete, in particular to a plastic-retaining polyether polycarboxylate high-performance water reducer and a preparation method thereof. Background technique [0002] With the vigorous development of my country's infrastructure construction, polycarboxylate-based high-efficiency water reducers with excellent performance and environmental protection characteristics are more and more widely used in the field of construction engineering. After more than 20 years of development, a variety of polycarboxylate superplasticizers with different molecular structures and performance characteristics have appeared on the market, so that users can choose to use them according to the conditions of concrete raw materials and engineering needs. The common feature of this type of water reducer is that the main chain is usually composed of unsaturated c...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C04B103/30
Inventor 李婷王子明师海霞龙俊余张召伟梅海峰齐冬有刘绪光刘元新谷冰莹王璇顾立明
Owner CNBM ZHONGYAN TECH
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