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Method for synthesizing slump-resistant naphthalene-based efficient water reducing agent

A technology of high-efficiency water reducer and synthesis method, which is applied in the preparation process of dispersants and oilfield chemicals, and the synthesis field of slump-preserving naphthalene-based high-efficiency water reducer, which can solve bleeding, loss of fluidity of fresh concrete, and late stage Rapid loss of fluidity and other issues, to achieve the effect of performance optimization and fluidity maintenance

Active Publication Date: 2015-06-17
WUHAN DONGPENG SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are also some shortcomings in terms of performance that need to be improved
At present, the main problem in terms of performance is that the fresh concrete mixed during use has a relatively obvious loss of slump over time. When the temperature is high or the cement hydration is fast, the fluidity of the fresh concrete is lost. Faster, not conducive to concrete pumping and construction
Most manufacturers control the slump loss of fresh concrete by compounding a certain retarder to inhibit the early hydration of cement, so that the slump loss of concrete has been improved, but the early stage of fresh concrete also appeared in the process of use. Bleeding and rapid loss of fluidity in the later period have caused some applicability problems in the use of naphthalene-based superplasticizers

Method used

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  • Method for synthesizing slump-resistant naphthalene-based efficient water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A synthetic method of a slump-preserving naphthalene series high-efficiency water reducer, the steps of which are as follows:

[0019] A. Add 100 kg of 95% industrial naphthalene into a glass-lined reactor, heat and melt to 135°C, add 110 kg of 98% industrial concentrated sulfuric acid, react at 163°C for 2.5 hours, and the acidity is 32.28% as measured by sampling;

[0020] B. Cool down to 122°C, add 32 kg of water, and hydrolyze for 0.5 hours;

[0021] C, be cooled to 95 ℃, add 58 kilograms of 37% industrial formaldehyde solution and carry out condensation reaction, condensation reaction temperature 116 ℃, time 4 hours, get naphthalenesulfonic acid formaldehyde condensate;

[0022] D. Cool down to 95°C, add 5.5 kg of isobutylamine and react with naphthalenesulfonic acid formaldehyde condensate for 1 hour, and the reaction temperature is 76°C;

[0023] E, add 32wt% sodium hydroxide aqueous solution, reactant is neutralized to pH value 6~7;

[0024] F. The liquid prod...

Embodiment 2

[0026] A synthetic method of a slump-preserving naphthalene series high-efficiency water reducer, the steps of which are as follows:

[0027] A. Add 100 kg of 95% industrial naphthalene into a glass-lined reactor, heat and melt to 145°C, add 110 kg of 98% industrial concentrated sulfuric acid, react at 158°C for 3 hours, and the acidity measured by sampling is 32.63%;

[0028] B. Cool down to 128°C, add 35 kg of water, and hydrolyze for 1.5 hours;

[0029] C, be cooled to 98 ℃, add 58 kilograms of 37% industrial formaldehyde solution and carry out condensation reaction, condensation reaction temperature 108 ℃, time 6 hours, get naphthalenesulfonic acid formaldehyde condensate;

[0030] D. Cool down to 78°C, add 5.5 kg of n-butylamine and react with naphthalenesulfonic acid formaldehyde condensate for 2 hours, and the reaction temperature is 76°C;

[0031] E, add 32wt% sodium hydroxide aqueous solution, reactant is neutralized to pH value 6~7;

[0032] F. The liquid product i...

Embodiment 3

[0034] A synthetic method of a slump-preserving naphthalene series high-efficiency water reducer, the steps of which are as follows:

[0035] A. Add 95 kg of 99% refined naphthalene into a glass-lined reactor, heat and melt to 135°C, add 120 kg of 98% industrial concentrated sulfuric acid, react at 162°C for 2.5 hours, and the acidity measured by sampling is 33.26%;

[0036] B. Cool down to 128°C, add 51 kg of water, and hydrolyze for 1.5 hours;

[0037] C, be cooled to 98 ℃, add 58 kilograms of 37% industrial formaldehyde solution and carry out condensation reaction, condensation reaction temperature 118 ℃, time 6 hours, get naphthalenesulfonic acid formaldehyde condensate;

[0038] D. Cool down to 85°C, add 16.5 kg of sec-butylamine and react with naphthalenesulfonic acid formaldehyde condensate for 2 hours, and the reaction temperature is 85°C;

[0039] E, add 32wt% sodium hydroxide aqueous solution, reactant is neutralized to pH value 6~7;

[0040] F. The liquid product ...

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Abstract

The invention belongs to the technical field of building materials and particularly discloses a method for synthesizing a slump-resistant naphthalene-based efficient water reducing agent. The method comprises the steps of adding industrial naphthalene or refined naphthalene into a glass-lined reactor, heating to melt, adding 98% industrial concentrated sulfuric acid, carrying out sulfonation reaction for 2-3 hours at the temperature of 135-175 DEG C, cooling to the temperature of 116-138 DEG C, adding water, carrying out hydrolysis reaction for 0.5-2.5 hours, cooling to the temperature of 90-110 DEG C, adding an industrial formaldehyde solution, carrying out condensation reaction for 3-8 hours, cooling to the temperature of 68-95 DEG C, adding alkylamine or alkyloamide, reacting with a naphthalene sulfonic formaldehyde condensate for 0.5-2.5 hours at the reaction temperature of 55-90 DEG C, adding sodium hydroxide, neutralizing until the pH value is 6-7, filtering a liquid product so as to remove impurities, concentrating the liquid product and carrying out spray drying, thereby obtaining a powdered product. The product prepared by the method disclosed by the invention is applicable to the preparation of concrete admixtures and is also applicable to the preparation of dispersants and oilfield chemicals.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for synthesizing a slump-retaining naphthalene-based high-efficiency water reducer. The product prepared by the invention is suitable for the preparation process of concrete admixture, and also suitable for the preparation process of dispersant and oil field chemicals. Background technique [0002] Concrete is the most widely used inorganic material in the world. It is usually made of sand, stone, cement, mineral admixtures (fly ash, mineral powder, etc.) and admixtures, mixed with water, and hardened. The function of concrete admixture is to add to concrete to improve the workability, impermeability, frost resistance and other properties of concrete. Common admixtures include water reducing agent, antifreeze agent, early strength agent, expansion agent, etc. Water reducing agent is the most widely used concrete admixture in the largest amount. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/22C04B103/30
Inventor 彭韬杨继亮李强
Owner WUHAN DONGPENG SCI & TECH DEV CO LTD
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