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Air-entraining type modified naphthalene water reducer and preparation method thereof

A naphthalene-based water reducer and modification technology, which is applied in the field of concrete admixtures, can solve the problems of rapid slump loss, general water reducing rate, and limited air-entraining function, and achieve good water reduction and slump retention. adaptive effect

Active Publication Date: 2021-07-16
JIANGSU SOBUTE NEW MATERIALS +1
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Problems solved by technology

[0008] In order to solve the problems that the existing naphthalene-based water-reducer has limited air-entraining function, average water-reducing rate, and rapid slump loss when it is applied to concrete, the present invention provides an air-entraining modified naphthalene-based water-reducer and its preparation method

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  • Air-entraining type modified naphthalene water reducer and preparation method thereof
  • Air-entraining type modified naphthalene water reducer and preparation method thereof
  • Air-entraining type modified naphthalene water reducer and preparation method thereof

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preparation example Construction

[0029] (1) Preparation of naphthol phosphate: Dissolve 1mol of 2-naphthol in 300ml of toluene, add 1mol of phosphorus oxychloride, heat up to 80-90°C, slowly add 1mol of pyridine, dropwise for 30min, and finish Then keep warm for 15 minutes. Cooling, precipitation, vacuum distillation, hydrolysis, suction filtration, and vacuum drying to obtain 2-naphthol phosphate.

[0030] (2) Preparation of air-entraining modified naphthalene-based water reducer: Add 0.1mol of naphthalene into the reaction kettle, heat to 150-160°C, add 0.13mol of concentrated sulfuric acid for sulfonation to obtain β-naphthalenesulfonic acid, and then lower the temperature After reaching 95-100°C, add 0.01mol 2-naphthol phosphate and 0.005mol sodium dodecyl naphthalenesulfonate, add dropwise 0.127mol formaldehyde, dropwise for 30min, react for 4h after the dropwise addition, and the reaction is over After cooling, adjust the pH to 6-8 with sodium hydroxide, which is the air-entraining modified naphthalene...

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Abstract

The invention provides an air-entraining type modified naphthalene water reducer and a preparation method thereof, and the air-entraining type modified naphthalene water reducer is obtained by polymerization reaction of naphthalene sulfonic acid prepared by reaction of concentrated sulfuric acid and naphthalene, naphthol phosphate prepared by reaction of naphthol and phosphorus oxychloride, and sodium alkyl naphthalene sulfonate. Compared with a traditional naphthalene water reducer, the prepared air-entraining type modified naphthalene water reducer has the advantages that the water reducing and slump retaining effects are obviously improved, the air-entraining type modified naphthalene water reducer has certain air-entraining performance, and the state of concrete is greatly improved.

Description

technical field [0001] The invention relates to an air-entraining modified naphthalene-based water reducer and a preparation method thereof, belonging to the field of concrete admixtures. Background technique [0002] Concrete water reducer is an indispensable admixture for high-performance concrete. It refers to an additive that can reduce the amount of mixing water when the amount of concrete and cement remains unchanged. It is the largest and most widely used concrete admixture. It can reduce water consumption, improve concrete strength and durability, and improve concrete workability and fluidity. [0003] At present, the largest amount of naphthalene-based water-reducing agent in my country is used, but naphthalene-based water-reducing agent is the second-generation water-reducing agent. Compared with the third-generation polycarboxylate-based water-reducing agent, its advantages are good cement adaptability and low price. But at the same time, because of its own struct...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G14/04C04B24/22C04B103/30
CPCC08G14/04C04B24/226C04B2103/302C04B2103/304
Inventor 乔敏吴井志陈健高南箫单广程朱伯淞冉千平张丽辉
Owner JIANGSU SOBUTE NEW MATERIALS
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