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Method for preparing naphthalene based superplasticizer by using refined naphthalene by-product 90 naphthalene

A high-efficiency water reducer and by-product technology, which is applied in the field of concrete admixtures, can solve problems such as rising prices, shortage of raw materials for naphthalene-based water reducers, and difficult handling of refined naphthalene by-products, so as to reduce production costs and simplify production processes. The effect of stable process and product performance

Inactive Publication Date: 2013-08-07
MAANSHAN CHINASEA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Aiming at the current shortage of raw materials for naphthalene-based water reducers, high prices, and difficult handling of refined naphthalene by-products, the present invention provides a method for manufacturing naphthalene-based high-efficiency water reducers using 90 naphthalene, a by-product of refined naphthalene

Method used

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  • Method for preparing naphthalene based superplasticizer by using refined naphthalene by-product 90 naphthalene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 100 grams of refined naphthalene by-products to a 500 ml three-neck flask and heat to melt, turn on the stirring paddle, raise the temperature to 125° C., slowly add 80 grams of 98% concentrated sulfuric acid by mass, and complete the addition in half an hour. Continue to heat up to 160°C for high temperature sulfonation for 3 hours and then cool down. When the temperature drops to 110°C, add 40 grams of water to hydrolyze for half an hour, and the acidity is 25%. Continue to cool down to 85°C, and evenly add 60 grams of 37% formaldehyde solution dropwise for 1.5 hours. During the formaldehyde process, the temperature is 85-105 °C; after the dropwise addition, it rises to 105 °C for 4 hours of constant temperature condensation. If the viscosity of the material is too high during the condensation reaction, it can be properly diluted with water. Finally, the temperature is lowered, neutralized with sodium hydroxide solution until the pH is between 7-9, and the powder ...

Embodiment 2

[0020] Add 100 grams of refined naphthalene by-products to a 500 ml three-necked flask and heat to melt, turn on the stirring paddle, raise the temperature to 135° C., slowly add 150 grams of 98% concentrated sulfuric acid by mass, and finish adding in half an hour. Continue to heat up to 165°C for high temperature sulfonation for 3 hours and then cool down. When the temperature drops to 120°C, add 30 grams of water for hydrolysis, and the acidity is 30%. Continue to cool down to 90°C, and evenly add 65 grams of 37% formaldehyde solution dropwise for 2 hours. During the dropwise addition of formaldehyde, the temperature is 85- 105°C. After the dropwise addition, raise the temperature to 125°C for 4 hours to condense at a constant temperature. If the viscosity of the material is too high during the condensation reaction, it can be properly diluted with water. Finally, the temperature is lowered, neutralized with calcium hydroxide solution until the pH is between 7 and 9, and t...

Embodiment 3

[0022] Add 100 grams of refined naphthalene by-products to a 500 ml three-neck flask and heat to melt, turn on the stirring paddle, raise the temperature to 130° C., slowly add 135 grams of 98% concentrated sulfuric acid by mass, and finish adding in half an hour. Continue to heat up to 160°C for high temperature sulfonation for 3 hours and then cool down. When the temperature drops to 115°C, add 35 grams of water for hydrolysis, and the acidity is 28%. Continue to cool down to 90°C, and evenly add 63 grams of 37% formaldehyde solution dropwise for 1.5 hours. During the dropwise addition of formaldehyde, the temperature is 85- 105°C, after the dropwise addition, rise to 110°C for 4 hours of constant temperature condensation. If the viscosity of the material is too high during the condensation reaction, it can be properly diluted with water. Finally, the temperature is lowered, and neutralized with sodium hydroxide solution until the pH is between 7 and 9, and the liquid produc...

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Abstract

The invention discloses a method for preparing a naphthalene based superplasticizer by using a refined naphthalene by-product 90 naphthalene, and belongs to the technical field of preparation of water reducing agents. The method for preparing the naphthalene based superplasticizer comprises the following steps of: (1) sulfonating the refined naphthalene by-product 90 naphthalene and sulfuric acidat the mass concentration of 98 percent in a ratio at high temperature of between 160 and 165 DEG C for three hours; (2) reducing temperature to 110 to 120 DEG C, adding water and hydrolyzing; (3) dripping formaldehyde at mass concentration of 37 percent at the temperature of between 85 and 105 DEG C; (4) keeping the temperature 105 to 125 DEG C, and condensing; and (5) cooling, and neutralizing by using a sodium hydroxide or calcium hydroxide solution. All indexes of the naphthalene based superplasticizer prepared by the method all meet the requirement of national standard GB8076-2008 'concrete admixture', the product performance of the naphthalene based superplasticizer prepared by the method is consistent with that of the naphthalene based superplasticizer prepared from pure industrialnaphthalene, the problem about the source of raw materials is solved, production cost is reduced, the problem about treatment of by-products in a production process of the refined naphthalene is solved, the production process of the refined naphthalene is simplified, and the method saves energy and is environment-friendly.

Description

technical field [0001] The invention relates to a method for preparing a water reducer, in particular to a method for manufacturing a naphthalene-based high-efficiency water reducer by using 90 naphthalene, a by-product of refined naphthalene, and belongs to the technical field of concrete admixtures. Background technique [0002] Concrete admixtures have become one of the indispensable components in concrete, and play a vital role in improving concrete strength, improving concrete performance, increasing concrete durability, and promoting the development of concrete technology. In recent years, driven by large-scale engineering construction, the consumption of concrete, especially ready-made concrete, in my country has grown rapidly, followed by a huge demand for concrete admixtures. Naphthalene-based high-efficiency water reducer is one of the most important types of concrete admixtures. With the continuous increase in dosage and resource consumption of industrial naphthal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/20C04B103/30
Inventor 佘祥海李绍华周建陈何宝国
Owner MAANSHAN CHINASEA NEW MATERIAL
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