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Polycarboxylic super plasticizer

A technology of superplasticizer and polycarboxylic acid, applied in the field of concrete admixtures, can solve the problems of reducing the space resistance between cement particles and particles, unfavorable polycarboxylate superplasticizer dispersibility and dispersion retention, etc. Effects of performance, reduced contact, good dispersion and dispersion retention

Active Publication Date: 2015-03-25
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing polycarboxylic acid superplasticizers are mainly obtained by copolymerization of acrylic acid and acrylamide small monomers with unsaturated alkyl polyether. Acrylic acid and acrylamide small monomers have less steric hindrance and are easy to polymerize. However, due to the small steric hindrance of the monomer, the steric resistance between the cement particles will also be reduced after being adsorbed on the surface of the cement particles, which is not conducive to the dispersion and dispersion retention of the polycarboxylate superplasticizer.

Method used

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  • Polycarboxylic super plasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0027] Add 432g of A1 and 310.5g of water into a 1000ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 60°C. Add 2.50g of 30% concentration of hydrogen peroxide, start to drop 50.0g of initiator aqueous solution (obtained by dissolving 1.50g of sodium ascorbate and 2.5g of 3-mercaptopropionic acid in 46g of water), then add dropwise 80.0g of monomer aqueous solution (from 51.8 g B1 monomer was dissolved in 28.2g water) and 48.0g of N-vinylpyrrolidone aqueous solution (obtained by dissolving 4.0g N-vinylpyrrolidone in 44.0g water), the initiator dropping time was controlled at 210 minutes, the monomer The dropwise addition time of the aqueous solution and the N-vinylpyrrolidone aqueous solution is controlled at 180 minutes, and the reaction temperature is controlled at 58-62°C. After the dropwise addition, keep the temperature at 58-62°C for 60 minutes to complete the polymerization reaction. After the hea...

Embodiment example 2

[0029] Add 408g of Al and 298g of water into a 1000ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 60°C. Add 3.0g of 30% concentration of hydrogen peroxide, start dropwise adding 50g of initiator aqueous solution (obtained by dissolving 1.50g of sodium ascorbate and 2.8g of 3-mercaptopropionic acid in 45.7g of water), then add dropwise 120.0g of monomer aqueous solution (from 42.8 g B1 monomer, 35.2g C1 monomer dissolved in 42g of water) and 40.0g of N-vinylpyrrolidone aqueous solution (obtained by dissolving 9.5g of N-vinylpyrrolidone in 30.5g of water), the initiator dropping time is controlled at 210 minutes, the dropwise addition time of monomer aqueous solution and N-vinylpyrrolidone aqueous solution is controlled at 180 minutes, and the reaction temperature is controlled at 58-62°C. After the dropwise addition, keep the temperature at 58-62°C for 60 minutes to complete the polymerization reaction. ...

Embodiment example 3

[0031] Add 396g of A2, 16g of B2, and 325g of water into a 1000ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 65°C. Add 3.0g of 30% concentration of hydrogen peroxide, start dropwise adding 50g of initiator aqueous solution (obtained by dissolving 1.50g of sodium ascorbate and 2.5g of 3-mercaptopropionic acid in 46g of water), and then add dropwise 90.0g of monomer aqueous solution (from 35.6g B1 monomer was dissolved in 54.4g water) and 50.0g of N-vinylpyrrolidone aqueous solution (obtained by dissolving 11g N-vinylpyrrolidone in 39g water), the initiator dropping time was controlled at 240 minutes, monomer aqueous solution and N - The time for adding the vinylpyrrolidone aqueous solution is controlled at 210 minutes, and the reaction temperature is controlled at 63-67°C. After the dropwise addition, keep the temperature at 63-67°C for 60 minutes to complete the polymerization reaction. After the heat ...

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Abstract

The invention discloses a polycarboxylic super plasticizer which is formed by copolymerizing alkyl unsaturated polyether A which accounts for 60-95% of the total weight of a monomer, an unsaturated carboxylic monomer which accounts for 5-30% of the total weight of the monomer, N-vinyl pyrrolidone which accounts for 0.5-5.0% of the total weight of the monomer and a polymerizable monomer C which accounts for 0-20% of the total weight of the monomer in an aqueous liquid at 40-100 DEG C in the presence of an initiator and a chain transfer agent. According to the polycarboxylic super plasticizer disclosed by the invention, in the presence of pyrrolidone lactam ring, the contact among cement particles is reduced, so that good dispersibility and dispersing stability are provided for concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and relates to a superplasticizer for mortar and concrete, and more specifically relates to a polycarboxylic acid superplasticizer. Background technique [0002] With the development of modern concrete technology, high-performance concrete is more and more widely used in engineering construction. Polycarboxylate superplasticizer, as the latest generation of chemical admixture, provides concrete with good fluidity and flow retention , has become an indispensable component for the preparation of high-performance concrete. Existing polycarboxylic acid superplasticizers are mainly obtained by copolymerization of acrylic acid and acrylamide small monomers with unsaturated alkyl polyether. Acrylic acid and acrylamide small monomers have less steric hindrance and are easy to polymerize. However, due to the small steric hindrance of the monomer, it will also reduce the steric resistance betw...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B103/32
Inventor 王绍华冯中军傅乐峰
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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