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Sulfamate water-reducing agent and preparation method thereof

A technology of sulfamic acid salt and sulfamic acid, which is applied in the field of concrete admixture and its preparation, and can solve problems such as easy explosion, hidden safety hazards, and large heat consumption

Inactive Publication Date: 2012-11-14
CHONGQING TIANZHU SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process of traditional sulfamic acid-based water reducers consumes a lot of heat energy, or conversely, it is easy to cause detonation. Therefore, the production of industrial sulfamic acid-based water-reducers has caused serious environmental pollution or there are Potential safety hazards caused by explosion polymerization

Method used

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  • Sulfamate water-reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 3000kg of water and about 300Kg of sodium hydroxide into the reaction kettle, stir evenly, add 600Kg of phenol, then continue stirring evenly, add 1050Kg of sulfamic acid, stir for 40 minutes, add 300Kg of formaldehyde dropwise into the reaction system and react for about 1 hour , add 350Kg p-aminobenzenesulfonic acid, then drop 700Kg formaldehyde into the reaction system, continue to react for half an hour, and obtain a liquid product. There is no need to provide external heat during the reaction process, only the heat generated by the reaction is collected and returned to the reactor through the circulation pipeline. It is measured that the molecular weight of the obtained condensation product is about 6000.

Embodiment 2

[0015] Add 3000kg of water and about 300Kg of sodium hydroxide into the reaction kettle, stir evenly, add 600Kg of phenol, then continue stirring evenly, add 1000Kg of sulfamic acid, stir for 40 minutes, add 300Kg of formaldehyde dropwise into the reaction system and react for about 1 hour , add 450Kg p-aminobenzenesulfonic acid, then drop 700Kg formaldehyde into the reaction system, continue to react for half an hour, and obtain a liquid product. There is no need to provide external heat during the reaction process, only the heat generated by the reaction is collected and returned to the reactor through the circulation pipeline. After measurement, the molecular weight of the obtained condensation product is about 6200.

Embodiment 3

[0017] Add 3000kg of water and about 300Kg of sodium hydroxide into the reaction kettle, stir evenly, add 600Kg of phenol, then continue to stir evenly, add 1050Kg of sulfamic acid, stir for 40 minutes, add 350Kg of formaldehyde dropwise into the reaction system and react for about 1 hour , add 350Kg p-aminobenzenesulfonic acid, then drop 600Kg formaldehyde into the reaction system, continue to react for half an hour, and obtain a liquid product. There is no need to provide external heat during the reaction process, only the heat generated by the reaction is collected and returned to the reactor through the circulation pipeline. It is measured that the molecular weight of the obtained condensation product is about 6100.

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Abstract

The invention provides a sulfamate water-reducing agent and a preparation method thereof. The sulfamate water-reducing agent is prepared from the following raw materials in parts by weight: 15-25 parts of phenol, 9-13 parts of sodium hydroxide, 20-35 parts of formaldehyde, 20-35 parts of sulfamic acid and 10-15 parts of sulfanilic acid. The sulfamate water-reducing agent has the advantages of lowslump loss, high water-reducing rate, simple preparation technique and low cost, does not need an external heat source in the reaction process, thereby greatly saving the energy and reducing the environmental pollution.

Description

technical field [0001] The invention relates to an admixture for concrete and a preparation method thereof, in particular to a sulfamic acid water reducer and a preparation method thereof. Background technique [0002] Water reducers are also called dispersants or plasticizers, and they get their name because they can reduce the water consumption of freshly mixed concrete when used. In the field of modern concrete technology, water reducing agent is one of the admixtures to improve the rheological properties of concrete, and has been regarded as the fifth component of concrete besides cement, sand, stone and water. [0003] Common water reducers mainly include lignosulfonate series, naphthalene series, melamine series, sulfamate series and polycarboxylic acid series. From the 1930s to the 1960s was the application and development period of common water reducers. The water reducers used in the early days were mainly organic compounds such as sodium rosinate, sodium lignosulf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B103/30
CPCC04B40/0039
Inventor 马清浩
Owner CHONGQING TIANZHU SCI & TECH CO LTD
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