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Concrete polycarboxylate water reducer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of polycarboxylate water reducing agent for concrete, can solve the problems of poor quality stability of polymer products, complicated synthesis of water reducing agent, etc., and achieve reasonable molecular structure, good slump retention, The effect of high water reduction rate

Inactive Publication Date: 2011-08-03
LIAONING OXIRANCHEM INC +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional water reducer is restricted by the molecular structure, and the slump problem cannot be solved fundamentally, so high-performance polycarboxylate water reducer has become a research hotspot
[0004] The molecular design of high-performance polycarboxylate water-reducers needs to be realized through preparation methods. The synthesis of such water-reducers is cumbersome, and the quality stability of polymerization products is poor. Therefore, a high-performance polycarboxylate water-reducer with simple process and convenient operation is developed. agent approach is imperative

Method used

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  • Concrete polycarboxylate water reducer and preparation method thereof
  • Concrete polycarboxylate water reducer and preparation method thereof
  • Concrete polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] In the reactor, add 58g of water and 45.4g of monomer A-1 (weight-average molecular weight of 1142), stir and heat to 30°C, then add 2.23g of 25% hydrogen peroxide, and add solution 1 (1.39g white block Mixture with 7.5g water) and Solution 2 (mixture of 7.82g maleic anhydride and 17g water), keep the temperature at 30°C, the dripping time is 2h, the aging time is 1h, after the reaction, the temperature is reduced to room temperature, with a mass concentration of 40 % NaOH aqueous solution adjusts the pH value to neutral, and discharges the material to obtain a high-performance polycarboxylate water-reducer product with a weight average molecular weight of 20,100 according to the present invention.

[0031] The structure of monomer A-1 is

[0032]

[0033] The structure of the finally obtained polycarboxylic acid water reducing agent is:

[0034]

example 2

[0036] In the reactor, add 154g water and 124g monomer A-2 (molecular weight 3430), stir and heat to 40℃, then add 2.23g 25% hydrogen peroxide, and add solution 1 (1.27g ascorbic acid and 7.5g water mixture) ) And solution 2 (mixture of 5.2g acrylic acid and 17g water), control the temperature to 40℃, the dripping time is 2h, the aging time is 1h, after the reaction, the temperature is reduced to room temperature, and the pH value is adjusted with the NaOH aqueous solution with a mass concentration of 40% To neutrality and discharging, a high-performance polycarboxylic acid water reducer product with a weight average molecular weight of 24,600 is obtained.

[0037] The structure of monomer A-2 is

[0038]

[0039] The final structure of the polycarboxylic acid water reducing agent is:

[0040]

example 3

[0042] In the reactor, add 133g water and 124g monomer A-3 (molecular weight 3436), stir and heat to 50℃, then add 3.15g ammonium persulfate, and add solution 1 (1.08g sodium bisulfite and 7.5g Water mixture) and solution 2 (a mixture of 9.3g methacrylic acid and 17g water), the temperature is controlled at 50℃, the dropping time is 2.5h, the aging time is 1h, after the reaction, the temperature is reduced to room temperature, and the mass concentration is 40% The pH value of the NaOH aqueous solution is adjusted to neutral, and the material is discharged to obtain a high-performance polycarboxylic acid water reducing agent product with a weight average molecular weight of 27960 according to the present invention.

[0043] The structure of monomer A-3 is

[0044]

[0045] The structure of the finally obtained polycarboxylic acid water reducing agent is:

[0046]

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Abstract

The invention provides a concrete polycarboxylate water reducer, which is shown in the formula (A), wherein R1 is alkyl having 1 to 10 carbon atoms, R2 is alkyl having 1 to 10 hydrogen or carbon atoms, R3 is H or COOH, and R4 is H or CH3. The water reducer has stable performance and high water-reducing rate and slump retention. The invention also provides a preparation method of the water reducer, which has the advantages of simple process, convenience for operation, environmental friendliness, low energy consumption and the like.

Description

Technical field [0001] The invention relates to a concrete admixture, in particular to a concrete polycarboxylic acid water reducer, and a preparation method thereof. Background technique [0002] Since the 1960s, the development of water-reducing agents has been dominated by high-efficiency water-reducing agents represented by naphthalene series and melamine series. At this stage, concrete technology has been greatly developed, but the traditional naphthalene series, melamine series and lignin reduction Although the water agent can make the freshly mixed mortar or concrete have better workability, the slump changes greatly over time. When it is transported to the construction site, the water reducing agent must be added to increase its fluidity, which will cause noise and emit a lot of emissions. Exhaust gas, and most of these water reducers use toxic formaldehyde, which is prepared by polycondensation reaction, which will inevitably cause environmental pollution during producti...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F290/06C08F4/40C04B103/30
Inventor 朱建民刘兆滨董振鹏仲崇纲周立明侯光陈南
Owner LIAONING OXIRANCHEM INC
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