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Cement disperser and its preparing method

A technology of cement dispersant and general formula, which is applied in the field of polycarboxylate polymer cement dispersant and its preparation, and can solve the problem of large excess, large slump loss of polycarboxylate water reducer over time, reduction of water reducer Insufficient water performance and other problems, achieve low viscosity, low water-cement ratio, and improve workability

Active Publication Date: 2008-04-23
JINING MING SHENG NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, when preparing this alkoxy polyalkylene glycol mono (meth) acrylate, need a large amount of excess (meth) acrylate, and the polycarboxylate water-reducer slump that prepares with this technology is over time Excessive loss
[0006] Patent CN1288870A discloses a method for preparing polyfunctional groups containing carboxyl, hydroxyl, and sulfonic acid groups in an oxidation-reduction system. The reaction temperature is 70-110°C, the oxidizing agent is hydrogen peroxide or persulfate, and the reducing agent is hypophosphorous acid or its salt, however, the water-reducing performance of the water-reducing agent prepared by this method is insufficient, and a good dispersion ability can only be obtained at a higher solid content

Method used

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  • Cement disperser and its preparing method
  • Cement disperser and its preparing method
  • Cement disperser and its preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In a four-necked flask equipped with stirring, thermometer, ventilation device and dropping device, add 140 parts of deionized water and 30 parts of sodium methallyl sulfonate, and heat up to 60 ° C under stirring and nitrogen filling conditions, while Add dropwise the mixed aqueous solution that is made up of 40 parts of polyoxyethylene base monomethyl ether methacrylate, 30 parts of acrylic acid, 1 part of 3-mercaptopropionic acid and 10 grams of 5% ammonium persulfate aqueous solution, and the dropping time is controlled at 30min. After the dropwise addition, keep the temperature at 60° C. for 4 hours to complete the reaction. After the reaction, use 55 parts by weight of 30% sodium hydroxide solution to neutralize the pH value of the solution to about 7.0 to obtain cement dispersant sample 1. The test results are shown in Table 1.

Embodiment 2

[0030] In a four-necked flask equipped with stirring, thermometer, ventilation device and dropping device, add 17 parts of deionized water and 5 parts of sodium methallyl sulfonate, and raise the temperature to 70 ° C under stirring and nitrogen filling conditions, while Add dropwise the mixed aqueous solution that is made up of 90 parts of polyoxyethylene base monomethyl ether methacrylate, 30 parts of acrylic acid, 0.625 part of 3-mercaptopropionic acid and 20 grams of 5% ammonium persulfate aqueous solution, and the dropping time is controlled at 40min. After the dropwise addition, keep the temperature at 70°C for 3 hours to complete the reaction. After the reaction, neutralize the pH value of the solution to about 7.0 with 55 parts of 30% potassium hydroxide solution to obtain cement dispersant sample 2. The test results are shown in Table 1.

Embodiment 3

[0032] In a four-necked flask equipped with stirring, thermometer, ventilation device and dropping device, add 66 parts of deionized water and 5 parts of sodium methallyl sulfonate, and raise the temperature to 80 ° C under stirring and nitrogen filling conditions, while A mixed aqueous solution composed of 40 parts of polyoxyethylene monomethyl ether methacrylate, 55 parts of acrylic acid, 0.1 part of 3-mercaptopropionic acid and 40 parts of 5% ammonium persulfate aqueous solution was added dropwise, and the dropping time was controlled at 50min. After the dropwise addition, keep the temperature at 80°C for 2 hours to complete the reaction. After the reaction, use 101 parts of 30% ammonium hydroxide solution to neutralize the pH value of the solution to about 7.0 to obtain cement dispersant sample 3. The test results are shown in Table 1.

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Abstract

This invention provides a cement dispersant agent and its preparation method, it is the co-polymer of: poly-oxyalkylene (methyl) acrylate, unsaturated monocarboxylic acid or its derivatives monomers or other monomers. The inventive product has functions of: adsorption, air-guiding, dispersing, wetting, solubilizing, stability-increasing, the product makes the concrete having: low water / cement ratio, low viscosity, high fluidizing, slow-set, easy to produce concrete, realizing long-distance transportation. This product has also advantages of: low energy consumption, high efficiency, good repeatability.

Description

technical field [0001] The invention relates to a polycarboxylic acid type polymer cement dispersant and a preparation method thereof. Background technique [0002] The development of cement dispersant (also known as cement superplasticizer) has a long history. In 1935, E.W. Scripcher of the United States first developed a plasticizer with lignosulfonate as the main component, which was widely used in C20-C40 concrete, and promoted the development of concrete to medium strength; in 1962, Japan successfully developed naphthalenesulfonate formaldehyde Condensate high-efficiency water reducer, this type of water reducer has the advantages of low production cost and good water reducing effect, so it is widely used in C30-C60 concrete, which promotes the development of concrete to high strength. However, the slump loss of the concrete prepared by using the water reducing agent is fast, which cannot meet the construction requirements such as pumping, and cannot be used to prepare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B103/40
CPCC04B28/02C04B24/2647C04B2103/408
Inventor 施晓旦李改霞田久旺
Owner JINING MING SHENG NEW MATERIALS CO LTD
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