Oligose graft modification polycarboxylic acids high efficiency water reducing agent and preparation method thereof

A high-efficiency water reducer and graft modification technology, applied in the field of concrete admixtures, can solve the problems of variety and performance limitations, and achieve the effects of easy control of reaction conditions, wide source of raw materials, and excellent performance

Inactive Publication Date: 2008-05-07
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its variety and performance are subject to certain restrictions

Method used

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  • Oligose graft modification polycarboxylic acids high efficiency water reducing agent and preparation method thereof
  • Oligose graft modification polycarboxylic acids high efficiency water reducing agent and preparation method thereof

Examples

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Embodiment 1

[0041] Be the polyethylene glycol 100.0g that molecular weight is 1000, sucrose 8.55g, catalyst p-toluenesulfonic acid 1.62g (1.5% of raw material gross mass), polymerization inhibitor hydroquinone 0.11g (0.1% of raw material gross mass) add Stir the four-neck flask to heat up. When the temperature rises to 90-100°C, add 13.53g of acrylic acid dropwise from a drop funnel. After reacting for 9±0.5h, take a sample to measure the esterification rate, stop the reaction, and obtain the esterified product.

[0042] Add 35.55g of sodium methacrylate, 9.50g of chain transfer agent isopropanol and 167.33g of distilled water into the reactor, heat to 60-90°C, and dropwise add the esterification product, 29.70g of acrylic acid, and 5.62g of persulfuric acid The initiator aqueous solution obtained by dissolving ammonium in 20g of water was added dropwise in 60-120min, and after reacting for 5±0.5h, it was cooled, and the pH value was adjusted to 7-8 with a mass concentration of 40% NaOH so...

Embodiment 2

[0044] Be the polyethylene glycol 100.0g that molecular weight is 1000, sucrose 4.28g, catalyst p-toluenesulfonic acid 1.56g (1.5% of raw material gross mass), polymerization inhibitor hydroquinone 0.10g (0.1% of raw material gross mass) add Stir and heat the four-neck flask to heat up. When the temperature rises to 90-100°C, add 12.16g of acrylic acid dropwise from a drop funnel. After reacting for 9±0.5h, take a sample to measure the esterification rate, stop the reaction, and obtain the esterified product.

[0045] Add 37.33g of sodium methpropylene sulfonate, 6.0g of chain transfer agent isopropanol and 354.02g of distilled water into the reactor, heat to 60-90°C, add dropwise the esterification product, 33.24g of acrylic acid, and 5.61g of persulfuric acid The initiator aqueous solution obtained by dissolving ammonium in 20g of water was added dropwise in 60-120min, and after reacting for 5±0.5h, it was cooled, and the pH value was adjusted to 7-8 with a mass concentration...

Embodiment 3

[0047] The polyethylene glycol 80.0g that molecular weight is 800, sucrose 8.55g, catalyst p-toluenesulfonic acid 1.33g (1.5% of raw material gross mass), polymerization inhibitor hydroquinone 0.09g (0.1% of raw material gross mass) add Stir the four-neck flask to heat up. When the temperature rises to 90-100°C, add 13.5g of acrylic acid dropwise from a drop funnel. After reacting for 9±0.5h, take a sample to measure the esterification rate, stop the reaction, and obtain the esterified product.

[0048] Add 40.59g of sodium methpropylene sulfonate, 9.50g of chain transfer agent isopropanol and 158.49g of distilled water into the reactor, heat to 60-90°C, add dropwise the esterification product, 35.85g of acrylic acid, and 5.35g of persulfuric acid The initiator aqueous solution obtained by dissolving ammonium in 20g of water was added dropwise in 60-120min, and after reacting for 5±0.5h, it was cooled, and the pH value was adjusted to 7-8 with a mass concentration of 40% NaOH s...

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Abstract

The invention relates to a polycarboxylic acid high-efficiency water reducer and a preparation method thereof. The preparation method of oligosaccharide graft modified polycarboxylic acid high-efficiency water reducer is characterized in that it comprises the following steps: 1) functional side chain grafting: oligosaccharide and methoxypolyethylene glycol (or polyethylene glycol Diol) and unsaturated carboxylic acid (or unsaturated acid anhydride) carry out esterification reaction to obtain esterification product; 2) free radical copolymerization: the esterification product, unsaturated carboxylic acid (or unsaturated acid anhydride), sulfonic acid group Free radical copolymerization of monomers in aqueous solution according to a certain ratio to obtain copolymerized products; after the reaction is completed, add alkali solution to adjust the pH to 7-8 to obtain the product. The product of the invention has excellent and stable performance, simple synthesis process, easy control of reaction conditions, wide source of raw materials, can reduce production cost, and has certain green and environmental protection functions.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a polycarboxylic acid high-efficiency water reducer and a preparation method thereof. Background technique [0002] Water reducer is the key technology of modern high-performance concrete. It can not only affect the workability of concrete in the fresh stage, but also interact with cement hydration products to improve the structure of concrete from the microscopic and submicroscopic levels, so as to meet Requirements for concrete in terms of construction performance, physical and mechanical properties, etc. Therefore, the use of water reducing agent is an effective measure to increase concrete strength, improve performance, save cement consumption and save energy. Some people summarize the achievements of water reducing agent on concrete modification and improvement process as the third major breakthrough in the history of cement application science and technology de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B103/30
CPCC04B40/0039C04B24/2647C04B2111/00017C04B24/168C04B2103/302C04B2103/0059C04B24/2694
Inventor 雷家珩刘勇郭丽萍巫辉雷刚
Owner WUHAN UNIV OF TECH
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