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Phosphino-carboxylic acid water reducing agent and preparation method thereof

A technology of water reducing agent and phosphine carboxylic acid, which is applied in the field of phosphine carboxylic acid water reducing agent and its preparation, can solve the problems of no water reducing performance, cannot be used alone, cannot guarantee concrete construction quality, etc., and achieves good water reduction. Performance and slump retention, the effect of ensuring quality

Active Publication Date: 2014-04-30
GUIZHOU DR SHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the working performance of concrete will change greatly in a short period of time, and the construction quality of concrete cannot be guaranteed.
At present, the solution to this problem is to add sodium gluconate, sucrose, citric acid, boric acid, potassium salt, etc. to the polycarboxylate water reducer to improve the performance of concrete, but this problem has not been fundamentally solved
[0004] On the other hand, in the prior art, phosphine carboxylic acid products are widely used in the ceramic industry and water treatment industry, but due to molecular structure, it does not show good water-reducing performance in concrete, and cannot be used in concrete used alone in

Method used

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  • Phosphino-carboxylic acid water reducing agent and preparation method thereof
  • Phosphino-carboxylic acid water reducing agent and preparation method thereof
  • Phosphino-carboxylic acid water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 245g of water and 320g of macromonomer isopentenyl polyethylene glycol ether into a 1000ml four-neck flask equipped with an electric stirring device, a constant temperature electric heating mantle, and a peristaltic pump. The molecular weight of the isopentenyl polyethylene glycol ether used is 1000~ 2500; stir and heat up to 60°C, add 3g of phosphorus-containing compound sodium hypophosphite, stir and dissolve evenly; within 2 hours, add dropwise a mixed aqueous solution consisting of 42g of acrylic acid and 30g of water and a mixture of 2g of ammonium persulfate and 50g of water Mix the aqueous solution at a temperature between 60°C and 62°C; after the dropwise addition, continue to react for 3 hours; then, lower the temperature to 35°C to 40°C, add 40% sodium hydroxide solution and dilution water to obtain a pH value equal to 7 40% phosphonic acid superplasticizer.

Embodiment 2

[0027] Add 245g of water and 320g of macromonomer methacryl polyethylene glycol ether into a 1000ml four-neck flask equipped with an electric stirring device, a constant temperature electric heating mantle, and a peristaltic pump, and the molecular weight of the methacryl polyethylene glycol ether used is 1000~ 2500; stir and heat up to 60°C, add 3g of phosphorus-containing compound sodium hypophosphite, stir and dissolve evenly; within 2 hours, add dropwise a mixed aqueous solution consisting of 42g of acrylic acid and 30g of water and a mixture of 2g of ammonium persulfate and 50g of water Mix the aqueous solution at a temperature between 60°C and 62°C; after the dropwise addition, continue to react for 3 hours; then, lower the temperature to 35°C to 40°C, add 40% sodium hydroxide solution and dilution water to obtain a pH value equal to 7 40% phosphonic acid superplasticizer.

Embodiment 3

[0029] Add 245g of water and 320g of macromonomer isopentenyl polyethylene glycol ether into a 1000ml four-neck flask equipped with an electric stirring device, a constant temperature electric heating mantle, and a peristaltic pump. The molecular weight of the isopentenyl polyethylene glycol ether used is 1000~ 2500; Stir and heat up to 70°C, add 3.5g of phosphorus-containing compound potassium hypophosphite, stir and dissolve evenly; within 2.5 hours, add dropwise a mixed aqueous solution consisting of 50.17g of methacrylic acid and 30g of water and 2.5g of sodium persulfate , 50g water mixed aqueous solution, the temperature is between 70 ℃ ~ 72 ℃; after the dropwise addition is completed, continue to react for 2 hours; then, lower the temperature to 35 ℃ ~ 40 ℃, add 40% sodium hydroxide solution and dilution water, get Phosphine carboxylic acid superplasticizer with PH value equal to 7 concentration and 40%.

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Abstract

The invention relates to a water reducing agent for concrete and a preparation method, and particularly relates to a phosphino-carboxylic acid water reducing agent and a preparation method thereof. The phosphino-carboxylic acid water reducing agent is formed by polymerizing a large monomer, a phosphorus-containing compound, a small monomer and an initiator through a free radial polymerization reaction; the raw materials are as follows in percentage by mole: 15-30% of large monomer, 1-8% of phosphorus-containing compound, 65-80% of small monomer, 1-5% of initiator and the balance of water; and the preparation method comprises the following steps: enabling the raw materials to react for 3-6 hours at 40-85 DEG C; cooling to 35-40 DEG C; and adding an alkaline compound to adjust the pH value to neutrality, wherein the product is the phosphino-carboxylic acid water reducing agent. The phosphino-carboxylic acid water reducing agent provided by the invention shows good water reducing property and collapse resistance in the concrete with different content of mud and powder / mud sand samples; and the working performance of the concrete with different content of powder / mud can be realized in normal compounding process, and the quality of the concrete can be guaranteed.

Description

technical field [0001] The invention relates to a water reducer for concrete and a preparation method thereof, in particular to a phosphine carboxylic acid water reducer and a preparation method thereof. Background technique [0002] In order to prevent the cement from forming a flocculation structure during the process of adding water and mixing, reduce water consumption and ensure the fluidity of the cement slurry, it is usually necessary to add cement water reducer during the process of adding water and mixing. In the past, most of the cement superplasticizers were naphthalene-based superplasticizers, which have been gradually replaced by polycarboxylate superplasticizers due to their shortcomings such as formaldehyde, non-environmental protection, and low water reducing rate (10-12%). [0003] Polycarboxylate Superplasticizer (Polycarboxylate Superplasticizer) is a high-performance water-reducing agent and a cement dispersant in the application of cement concrete. Exist...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/24C04B103/30
Inventor 陈杰方世昌孙亮罗秀平
Owner GUIZHOU DR SHI TECH
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