Preparation method of slump loss resistant naphthalene water reducer

A naphthalene-based water reducer and slump-preserving technology, which is applied in the field of preparation of slump-retaining naphthalene-based water reducers, can solve problems such as environmental pollution, obvious seasonal fluctuations in industrial naphthalene price fluctuations, and impacts, and achieve reductions in environmental pollution, The effect of enhancing the controllability of the molecular structure and reducing the cost

Active Publication Date: 2014-06-18
SHAANXI KZJ NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the price fluctuation of industrial naphthalene has obvious seasonality. If the price of raw materials is high, the increase of industrial naphthalene will have a serious impa

Method used

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  • Preparation method of slump loss resistant naphthalene water reducer

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Comparison scheme
Effect test

Embodiment 1

[0019] (1) Sulfonation: Add 100kg of industrial naphthalene and 20kg of methylnaphthalene to a closed reaction kettle A connected with a cooling reflux device, and start adding 110kg of concentrated sulfuric acid and 50kg of cyclohexane dropwise when the temperature rises to 120-130°C , the dropwise addition was completed within 0.5 hours. When the concentrated sulfuric acid is added dropwise, the temperature in the kettle is controlled at 160-170° C., and the heat preservation is continued for 1.5 hours. During the reaction process, the steam pipeline is connected to the lower part of the sulfonation reactor A, and the steam is introduced for 0.5 to 1 hour. The cyclohexane enters the cooling reflux device on the upper part of the reactor A along with the naphthalene steam for heat exchange and condensation, and the naphthalene steam and cyclohexane pass through After condensation, the cooling liquid is continuously sent to the reactor to continue the circular reaction until t...

Embodiment 2

[0024] (1) Sulfonation: Add 130kg of industrial naphthalene and 40kg of acenaphthene to the closed reaction kettle A connected with a cooling reflux device, and when the temperature rises to 130°C, start to add 150kg of concentrated sulfuric acid and 60kg of acetic acid dropwise, within 0.5 hours Finished adding. When the concentrated sulfuric acid is added dropwise, the temperature in the kettle is controlled at 155-165° C., and the heat preservation is continued for 2 hours. During the reaction process, the steam pipeline is connected to the lower part of the sulfonation reactor A, and the steam is introduced for 0.5 to 1 hour. The acetic acid enters the cooling reflux device at the upper part of the reactor A along with the naphthalene steam for heat exchange and condensation, and the naphthalene steam and acetic acid are condensed to form a cooling The liquid is continuously sent into the reactor to continue the circular reaction until the end of the reaction, and finally ...

Embodiment 3

[0029] (1) Sulfonation: Add 120kg of industrial naphthalene and 25kg of anthracene to the closed reaction kettle A connected to the cooling reflux device, and when the temperature rises to 125°C, start to add 150kg of concentrated sulfuric acid and 70kg of dichloromethane dropwise respectively, and in 1 hour The dropwise addition is completed. When the concentrated sulfuric acid is added dropwise, the temperature in the kettle is controlled at 160-170° C., and the heat preservation is continued for 2 hours. During the reaction process, the lower part of the sulfonation reactor A is connected to the steam pipeline, and the steam time is 0.5 to 1 hour. The dichloromethane enters the cooling reflux device on the upper part of the reactor A along with the naphthalene steam for heat exchange and condensation. The naphthalene steam and the dichloromethane pass through After condensation, the cooling liquid is continuously sent to the reactor to continue the circular reaction until t...

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Abstract

The invention discloses a preparation method of a slump loss resistant naphthalene water reducer. The naphthalene water reducer is prepared by sulfonating, hydrolyzing, condensing and neutralizing raw materials including crude naphthalene, naphthalene derivatives such as methylnaphthalene, concentrated sulfuric acid, formaldehyde, caustic soda liquid, water and the like. According to the production process, monomer substituents, such as methylnaphthalene and acenaphthene are introduced, an organic solvent azeotropic method is adopted for synthesizing, and finally sodium metasilicate is adopted for neutralizing to adjust pH to 7-10 to obtain the final naphthalene water reducer. The slump loss resistant naphthalene water reducer is prepared by the implementation mode disclosed by the invention, the crude naphthalene is replaced by partial naphthalene derivatives, an effective path of reducing the cost is proposed, naphthalene steam and a solvent are condensed to form a naphthalene solution to be recycled, and thus the product yield is improved and the environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of a slump-retaining naphthalene-based water reducer. Background technique [0002] With the rapid development of my country's economy and the continuous improvement of basic building facilities, the demand for the amount of concrete admixtures is increasing. The addition of concrete admixtures can improve the fluidity and workability of fresh concrete, and at the same time can significantly reduce the amount of water and increase the strength of concrete. Naphthalene-based superplasticizers have the advantages of low cost and good adaptability, and are currently the most widely used and produced concrete admixtures among high-efficiency superplasticizers. The production method of naphthalene-based water reducer is in a mature stage, generally divided into sulfonation, hydrolysis, condensation, and neutralization stages. [0003] Howe...

Claims

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Application Information

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IPC IPC(8): C04B24/22C04B103/30
Inventor 苏晋升方云辉马志武赖广兴
Owner SHAANXI KZJ NEW MATERIALS
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