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Sulfamate water reducing agent preparation method

A technology of sulfamic acid salt and sodium sulfamic acid is applied in the field of water reducing agent, which can solve the problems of easy segregation and bleeding, short side chain length, low water reduction rate and low water reduction rate.

Active Publication Date: 2018-02-23
HUIZHOU JIANKE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with polycarboxylate water reducing agent, its side chain length is shorter, so the water reducing rate is lower than polycarboxylate water reducing rate.
Sulfamate is rarely used alone, and its biggest weakness is that it is easy to segregate and bleed

Method used

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  • Sulfamate water reducing agent preparation method

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preparation example Construction

[0022] see figure 1 , the preparation method of sulfamate water-reducer in one embodiment, comprises the steps:

[0023] S110: Mix phenol, alkylphenol polyoxyethylene ether, sodium p-aminobenzenesulfonate and deionized water to obtain a mixed solution.

[0024] By mixing phenol, alkylphenol polyoxyethylene ether, sodium p-aminobenzenesulfonate and deionized water, it can be more uniformly mixed with other components in subsequent operations.

[0025] In one embodiment, the alkylphenol polyoxyethylene ether is nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether, dodecylphenol polyoxyethylene ether and dinonylphenol polyoxyethylene ether. at least one.

[0026] S110: Perform a heating operation on the mixed solution, adjust the pH of the mixed solution to a first preset pH value, and then add formaldehyde to perform a methylolation reaction to obtain a first reaction solution.

[0027] By adding formaldehyde, a methylol group can be introduced on the benzene ...

Embodiment 1

[0047] Put 160g of sodium p-aminobenzenesulfonate, 80g of phenol, 20g of OP-10, and 360g of deionized water into the reaction kettle, and stir for 10 minutes. Add 5g of 20% dilute sulfuric acid, raise the temperature to 90°C and add 150g of formaldehyde solution dropwise to the system at a constant speed for 3 hours. Incubate at 90°C to 95°C for 4 hours to carry out the condensation reaction. Lower the temperature to 85°C, add 15g of 32% liquid caustic soda and 2g of urea, and keep the temperature between 85°C and 90°C for 4 hours.

Embodiment 2

[0049] Put 160g of sodium p-aminobenzenesulfonate, 80g of phenol, 24g of TX-12, and 370g of deionized water into the reaction kettle, and stir for 10 minutes. Add 5g of 20% dilute sulfuric acid, raise the temperature to 90°C and add 150g of formaldehyde solution dropwise to the system at a constant speed for 3 hours. Incubate at 90°C to 95°C for 4 hours to carry out the condensation reaction. Lower the temperature to 85°C, add 15g of 32% liquid caustic soda and 2g of urea, and keep the temperature between 85°C and 90°C for 4 hours.

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Abstract

The invention relates to a sulfamate water reducing agent preparation method, which comprises: mixing phenol, alkylphenol polyoxyethylene ether, sodium para-aminobenzenesulfonate and deionized water to obtain a mixing liquid; heating the mixing liquid, adjusting the pH value of the mixing liquid to a first preset pH value, adding formaldehyde, and carrying out a hydroxymethylation reaction to obtain a first reaction liquid; carrying out a constant temperature condensation reaction on the first reaction liquid under a preset condensation temperature condition to obtain a second reaction liquid;and at a preset rearrangement temperature, adding urea to the second reaction liquid, adjusting the pH value to a second preset pH value, and carrying out a molecular rearrangement reaction to obtainthe sulfamate water reducing agent. According to the present invention, the obtained sulfamate water reducing agent has different side chains with different lengths, wherein the side chains comprisealkyl, hydroxymethyl, sodium para-aminobenzenesulfonate, phenol, urea and other groups, even the polymerization products of the groups, such that the segregation bleeding problem can be reduced, and the water reducing ability can be improved.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to a preparation method of a sulfamate water reducer. Background technique [0002] Water reducing agent is an indispensable component in modern concrete, and it is called the fifth largest component besides sand, stone, cement and water. Adding water reducer to concrete can not only reduce the amount of mixing water and increase the strength of concrete, but also greatly reduce the amount of cement, reduce the cost of concrete, and reduce the heat of hydration without changing the strength of concrete. In addition, the water reducing agent also has the positive effect of improving the workability of concrete, so it is also called a superplasticizer. The common water reducers mainly include lignosulfonate series, naphthalene sulfonate formaldehyde condensate, melamine series, sulfamic acid series and polycarboxylic acid high performance water reducer. In the early days, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G14/08C08G14/073C04B24/22C04B103/30
CPCC04B24/226C04B2103/302C08G14/08
Inventor 赵樑王子明方迪
Owner HUIZHOU JIANKE IND
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