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Sulfamate as high performance reducing water agent for building and preparing proces thereof

A technology of sulfamate and p-aminobenzenesulfonic acid, applied in the field of building materials, can solve the problems of price increase, scarcity, shortage of naphthalene-based superplasticizers, etc., to improve fluidity, increase strength and durability, inhibit Effects of Liquidity Loss

Inactive Publication Date: 2005-01-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, due to the relative shortage of industrial naphthalene, the main raw material of naphthalene-based high-efficiency superplasticizers, the supply of naphthalene-based high-efficiency superplasticizers has been in short supply, and even the price has doubled; Adaptability issues are affecting engineering practice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, the sulfamate high-performance water reducer for construction is synthesized according to the ratio of 1 mol of p-aminobenzenesulfonic acid, 1.5 mol of sodium hydroxide, 1.8 mol of phenol, 4.5 mol of formaldehyde, and 44.5 mol of water, and the synthesis temperature is 75 °C, the reaction time is 4h. The solid content of the obtained product is 38%. Adding the water reducing agent accounting for 0.6% of the cement mass can reduce the water consumption of concrete by 26%, and the compressive strength of 3d, 7d and 28d can be increased by 54%, 61% and 24% respectively. However, if the naphthalene-based high-efficiency water reducer is added, the water reducing rate can only reach more than 25% when the dosage is 1.2%.

Embodiment 2

[0024] Example 2, sulfamate high-performance water reducer for construction, synthesized according to the ratio of 1 mol of p-aminobenzenesulfonic acid, 1.4 mol of sodium hydroxide, 1.6 mol of phenol, 4.0 mol of formaldehyde, and 36 mol of water, and the synthesis temperature was 110°C , The reaction time is 3.5h. The solid content of the obtained product is 40%. Adding the water reducing agent accounting for 0.8% of the cement mass can increase the concrete slump from 8cm to 24cm while still reducing the water consumption by 13%. 3d, 7d and 28d The compressive strength increased by 45%, 40% and 18%, respectively. When the prepared concrete has an initial slump of 24cm, the slump after 30min, 60min and 120min is 25cm, 25cm and 24cm respectively, that is, the slump has not been lost within 2 hours.

Embodiment 3

[0025] Example 3, sulfamate high-performance water reducer for construction, synthesized according to the ratio of 1 mol of p-aminobenzenesulfonic acid, 1.2 mol of sodium hydroxide, 1.9 mol of phenol, 5.5 mol of formaldehyde, and 55 mol of water, and the synthesis temperature was 100°C , The reaction time is 3.5h. The solid content of the obtained product is 29%. Adding 0.5% of the water reducer in the cement mass can reduce the water consumption by 20%, and the compressive strength of 3d, 7d and 28d can be increased by 40%, 52% and 19% respectively. When the prepared concrete had an initial slump of 24cm, the slump after 30min, 60min and 120min was 23cm, 25cm and 24cm respectively, that is, the slump was not lost within 2 hours.

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PUM

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Abstract

The invention relates to a building sulfamate high-performance water reducer and its preparing method, synthesized of benzene solfonic acid, sodium hydroxide, phenol, formaldehyde and water, and the product mainly contains the groups: -CN, benzene ring, -SO3, etc, and the average molecular weight is 4000-9500. It can make the water reduction ratio of concrete up to above 25%, improve the fluidity of concrete by a large margin, makes the loss rate of concrete slump in 2 hours less than 10%, enhances the strength by a large margin, and improves the durability of concrete. It has better adaptability to various cements. It is applied to the constructions (structures) of premixed concrete commodity, high-strength high-performance concrete, reinforced concrete, etc.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-performance sulfamate water reducer for building and a preparation method thereof. Background technique [0002] Since Hattori Kenichi of Japan first developed the synthesis process of naphthalenesulfonic acid formaldehyde condensate high-efficiency water reducer (hereinafter referred to as "naphthalene-based high-efficiency water reducer") and applied it in practice, the amount of high-efficiency water reducer has been expanding. However, the development of ready-mixed commercial concrete in the late 1970s and early 1980s put forward higher requirements for the performance of superplasticizers, especially the time-dependent slump retention and adaptability to various cements. Therefore, in the following two decades, the main research work on superplasticizers focused on the control of slump loss of concrete mixed with naphthalene-based superplastici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06C04B24/02C04B24/10C04B24/12C04B24/20
CPCC04B24/20C04B2103/302
Inventor 孙振平蒋正武张冠伦王玉吉
Owner TONGJI UNIV
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