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Synthetic method of polycarboxylic acid type highly slump loss resistant water-reducing agent

A synthesis method and technology of water reducer, which is applied in the synthesis of polycarboxylate high slump-retaining water-reducer and the synthesis of polycarboxylate-based water-reducer for concrete, can solve the problems of insufficient slump-retaining ability of water reducer, etc. Achieve the effects of low cost, low preparation cost and cost saving

Active Publication Date: 2015-05-20
武汉市联合石油化工有限责任公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of insufficient slump-retaining ability of the current polyether-type polycarboxylate water-reducing agent, and use unsaturated polyoxyethylene ether as raw material to synthesize a kind of polyether-type polycarboxylate water reducer with high slump-retaining performance at a relatively low temperature. Superplasticizer

Method used

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  • Synthetic method of polycarboxylic acid type highly slump loss resistant water-reducing agent
  • Synthetic method of polycarboxylic acid type highly slump loss resistant water-reducing agent
  • Synthetic method of polycarboxylic acid type highly slump loss resistant water-reducing agent

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Embodiment 1

[0029] A kind of synthetic method of polycarboxylic acid type high slump water reducer, its steps are as follows:

[0030] The first step, preparation of treated water: add water treatment agent acrylic acid-maleic anhydride copolymer (PAA-PMA) to the tap water until the content of PAA-PMA is 6mg / L, and get treated water for later use;

[0031] The molecular weight of the PAA-PMA used is 5000, and the molar ratio of acrylic acid:maleic anhydride is 1.5:1.

[0032] The second step, synthesis: Put 240g of isopentenol polyoxyethylene ether (molecular weight 2400), 20g of maleic anhydride, 4g of 2-acrylamide-2-methylpropanesulfonic acid AMPS into the reaction kettle equipped with thermometer and electric stirring And 110g of treated water, heated up to 40°C and stirred until completely dissolved, adjusted the pH value to 4 with 32wt% NaOH aqueous solution, then added 1.8g of 31% hydrogen peroxide, kept the temperature at 40°C, and began to continuously drop 11g of acrylic acid pre...

Embodiment 2

[0034] A kind of synthetic method of polycarboxylic acid type high slump water reducer, its steps are as follows:

[0035] The first step, preparation of treated water: add water treatment agent acrylic acid-maleic anhydride copolymer (PAA-PMA) to the tap water until the content of PAA-PMA is 3mg / L, and get treated water for later use;

[0036] The molecular weight of the PAA-PMA used is 4000, and the molar ratio of acrylic acid:maleic anhydride is 1.4:1.

[0037] The second step, synthesis: Put 252g of isopentenol polyoxyethylene ether (molecular weight 2400), 20g of maleic anhydride, 6g of AMPS and 116g of treated water into a reaction kettle equipped with a thermometer and electric stirring, raise the temperature to 40°C and stir until Completely dissolve, use 32wt% NaOH aqueous solution to adjust the pH value to 4, then add 1.47g 31% hydrogen peroxide, keep the temperature at 40°C, and start to continuously add 10g of acrylic acid, 1.33g of ferrous ammonium sulfate, 0.64g ...

Embodiment 3

[0039] A kind of synthetic method of polycarboxylic acid type high slump water reducer, its steps are as follows:

[0040] The first step, preparation of treated water: add water treatment agent acrylic acid-maleic anhydride copolymer (PAA-PMA) to the tap water until the content of PAA-PMA is 8mg / L, and get treated water for later use;

[0041] The molecular weight of the PAA-PMA used is 2000, and the molar ratio of acrylic acid:maleic anhydride is 1.1:1.

[0042] The second step, synthesis: put 360g of methallyl alcohol polyoxyethylene ether (molecular weight 2400), 20g of maleic anhydride, 4g of sodium methacrylate and 165g of treated water into a reaction kettle equipped with a thermometer and electric stirring. Raise the temperature to 40°C and stir until it is completely dissolved, adjust the pH value to 4 with 32wt% NaOH aqueous solution, then add 1.9g of 31% hydrogen peroxide, keep the temperature at 40°C, and start to continuously drop 15g of acrylic acid and 1.75g ​​o...

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Abstract

The invention relates to the technical field of building material synthesis and particularly discloses a synthetic method of polycarboxylic acid type highly slump loss resistant water-reducing agent. The method comprises the following steps: 1, water treatment agent and acrylic acid-maleic anhydride copolymer are added into tap water until the content of acrylic acid-maleic anhydride copolymer is 3-8mg / L so as to obtain treating water; and 2, backing material formed by unsaturated polyoxyethylene ether, maleic anhydride, functional small monomer, and treating water is added into a polyreactor, the temperature is increased to be 40 DEG C and stirring is performed till the mixture is completely dissolved resolution, NaOH solution is used for adjusting pH to 4, then a proper amount of hydrogen peroxide is added, and mixed solution composed of acrylic acid, ammonium ferrous sulfate, a cross-linking agent, a chain transfer agent and treating water well prepared in advance is dripped; dripping is finished within 2.5 to 4 h, thermal insulation is continuously performed for 0.5 to 1 h after dripping, and NaOH solution is used for neutralization to pH 5-6. The method provided by the invention has the advantages that the process is simple, the conditions are mild, the feedstock conversion rate is high, tap water can be used as raw materials, the cost is greatly reduced, and the slump loss resistance of products is obviously superior to that in the prior art.

Description

technical field [0001] The invention relates to the technical field of synthesis of building materials, in particular to a synthesis method of a polycarboxylate water reducer for concrete, and more particularly to a synthesis method of a polycarboxylate high slump retention water reducer. Background technique [0002] Polycarboxylate water reducer is called the third generation of high-performance water reducer because of its excellent performance and environmental protection. As the country continues to vigorously develop infrastructure and the requirements for concrete are getting higher and higher, the market share of polycarboxylate water reducers is increasing. Polycarboxylate superplasticizer with high water reducing rate and high slump retention performance has more favorable market competitiveness. [0003] At present, there are two main production processes of polycarboxylate superplasticizers, one is ester type, which uses MPEG as raw material, and is prepared by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F222/06C08F220/06C08F220/58C08F228/02C08F4/40C08F2/10C04B24/16C02F1/00C04B103/30
Inventor 彭韬向红军
Owner 武汉市联合石油化工有限责任公司
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