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A kind of superplasticizer and preparation method thereof

A technology of superplasticizer and initiator, which is applied in the field of superplasticizer and its preparation, can solve the problems of construction trouble, bottom removal, and easy bleeding.

Active Publication Date: 2017-09-26
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current superplasticizer is mainly obtained by the copolymerization of small monomers of acrylic acid and sulfonic acid with unsaturated alkyl polyether. Its molecular structure is too hydrophilic, and it is prone to bleeding when it is dispersed on hydrophobic cement particles. Problems such as water, bottom removal, and poor adaptability to materials have brought certain troubles to the construction of the project

Method used

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  • A kind of superplasticizer and preparation method thereof
  • A kind of superplasticizer and preparation method thereof
  • A kind of superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 216g of macromonomer A1, 216g of macromolecular monomer A2, 8.0g of arylboronic acid monomer B1 and 347.5g of water in a 2000ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to heat up to 60 ℃. Add the hydrogen peroxide of 2.50g30% concentration, start dripping 50.0g initiator aqueous solution (obtained by 1.50g sodium ascorbate, 2.5g 3-mercaptopropionic acid being dissolved in 46g water), then dropwise add 90.0g monomer aqueous solution (by 51.8g can Polymerized monomer C1 is obtained by dissolving 38.2 g of water), the initiator dropping time is controlled at 210 minutes, the monomer aqueous solution dropping time 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 heat preservation is completed, cool down to below 50°C and add 70.0 g of 30% NaOH aqueous solution...

Embodiment 2

[0032] Add 408g of macromonomer A2, 16g of arylboronic acid monomer B2 and 309g of water into a 2000ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 40°C. Add 4.0g ammonium persulfate after the monomer dissolves, start to drip 63g chain transfer agent aqueous solution (by 1.0g sodium ascorbate, 2.8g 3-mercaptopropionic acid are dissolved in 59.2g water and obtain), then dropwise add 135g monomer aqueous solution ( Obtained by dissolving 44.0g of polymerizable monomer C1 in 91g of water), the time for adding the chain transfer agent aqueous solution is controlled at 210 minutes, the time for adding the aqueous monomer solution is controlled at 180 minutes, and the reaction temperature is controlled at 38-42°C. After dropping, stir at 38~42 DEG C for 60 minutes to make the polymerization reaction complete, then add 65.0g 30% NaOH aqueous solution to obtain superplasticizer PCE-2 of the present invention, its ...

Embodiment 3

[0034] Add 384g macromer A1, 8g polymerizable monomer C2, 21.4g arylboronic acid monomer B2 and 370.6g water in a 2000ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to heat up to 80 ℃. Add 6.0g ammonium persulfate after the monomer is dissolved, start to drop 50g chain transfer agent aqueous solution (3.0g 3-mercaptopropionic acid is dissolved in 47.0g water to obtain), then add dropwise 90.0g monomer aqueous solution (from 46g polymerizable Monomer C1 was dissolved in 44g of water), the chain transfer agent aqueous solution dropwise time was controlled at 240 minutes, the monomer aqueous solution dropwise time was controlled at 210 minutes, and the reaction temperature was controlled at 78-82°C. After the dropwise addition, keep the temperature at 78-82°C for 60 minutes to complete the polymerization reaction. After the heat preservation is completed, cool down to below 50°C and add 70.0 g of 30% NaOH aqueous solution to obtain t...

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Abstract

The invention discloses a superplasticizer, which is based on a copolymer of a macromonomer A, an arylboronic acid monomer B and a polymerizable monomer C. Because arylboronic acid monomer is introduced in the present invention, the existence of benzene ring on its molecular chain has increased the rigidity of superplasticizer molecule, and boric acid group has good hydrophilicity thereby has improved the surface activity of polymer, Can significantly improve the workability and workability of concrete. The superplasticizer of the invention is environmentally friendly and has excellent performance.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and relates to a superplasticizer for mortar and concrete and a preparation method thereof. Background technique [0002] With the development of modern concrete technology, high-performance concrete is more and more widely used in engineering construction. Superplasticizer is the latest generation of chemical admixtures, which can be used to prepare different types of building admixtures for different purposes according to molecular structure design. agent. The current superplasticizer is mainly obtained by the copolymerization of small monomers of acrylic acid and sulfonic acid with unsaturated alkyl polyether. Its molecular structure is too hydrophilic, and it is prone to bleeding when it is dispersed on hydrophobic cement particles. Problems such as water, bottom removal, and poor adaptability to materials have brought certain troubles to the construction of the project. Conten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F212/14C08F220/58C08F220/06C08F222/06C04B24/26
Inventor 王绍华冯中军傅乐峰
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD