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A kind of naphthalene series powder superplasticizer and preparation method thereof

A technology of naphthalene-based powder and water reducer, which is applied in the field of naphthalene-based powder water reducer and its preparation, which can solve the problems of powder products such as easy moisture absorption and naphthalene vapor emission, shorten production time, reduce tail gas emissions, and improve sulfonation conversion rate effect

Active Publication Date: 2017-12-22
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method solves the problem of naphthalene vapor emission to a certain extent, it does not involve the problem that the powder product is easy to absorb moisture

Method used

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  • A kind of naphthalene series powder superplasticizer and preparation method thereof
  • A kind of naphthalene series powder superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Sulfonation: add 100 parts of industrial naphthalene to a closed reaction kettle A with a cooling reflux device on the upper part and a steam heating pipe on the lower part, heat up to 130-140 ° C, add 120 parts of concentrated sulfuric acid dropwise and add in 0.5 The dropwise addition is completed within h, and after the addition is completed, continue to heat up to 160°C to start the sulfonation reaction. After sulfonation for 1 hour, add 20 parts of methyl acetate, and continue the sulfonation for 2 hours;

[0029] The added ester compound is hydrolyzed under acidic conditions. The hydrolysis reaction will consume a certain amount of water, which will promote the sulfonation reaction to the right and increase the sulfonation conversion rate of naphthalene. However, the organic solvent for hydrolysis has a low boiling point and is easy to dissolve at high temperature. The volatilization follows the naphthalene vapor into the cooling reflux device on the upper part ...

Embodiment 2

[0037] 1) Sulfonation: add 110 parts of industrial naphthalene to a closed reaction kettle A with a cooling reflux device on the upper part and a steam heating pipe on the lower part, heat up to 130-140 °C, add 120-140 parts of concentrated sulfuric acid dropwise and The dropwise addition is completed within 0.5h. After the addition, continue to heat up to 160°C to start the sulfonation reaction. After sulfonation for 1 hour, add 30 parts of butyl formate and continue the sulfonation for 2 hours; esters are hydrolyzed under acidic conditions to promote the sulfonation of naphthalene. Transformation, the hydrolyzate can be recycled with the naphthalene vapor through the cooling reflux device, and the above-mentioned cycle and recovery steps of the ester hydrolyzate can further increase the sulfonation rate and make the reaction more complete;

[0038] 2) Hydrolysis: After the sulfonation reaction is completed, the temperature is lowered to 120-125°C, and 30-40 parts of water are...

Embodiment 3

[0045] 1) Sulfonation: Add 120 parts of industrial naphthalene to the closed reaction kettle A with a cooling reflux device installed on the upper part and a steam heating pipeline connected to the lower part, heat up to 130-140 ° C, add 140 parts of concentrated sulfuric acid dropwise and add 140 parts of concentrated sulfuric acid at 0.5 The dropwise addition is completed within h, and after the addition, continue to heat up to 160°C to start the sulfonation reaction. After sulfonation for 1 hour, add 30 parts of ethyl acetate and continue the sulfonation for 2 hours; esters are hydrolyzed under acidic conditions to promote the sulfonation conversion of naphthalene. The hydrolyzate can be recycled along with the naphthalene vapor through the cooling reflux device, and the sulfonation rate can be further improved through the above-mentioned cycle and recovery steps of the ester hydrolyzate, making the reaction more complete;

[0046] 2) Hydrolysis: After the sulfonation reacti...

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Abstract

The invention discloses a naphthalene-based powder water reducing agent and a preparation method thereof. The naphthalene-based water reducing agent is prepared by adopting industrial naphthalene, concentrated sulfuric acid, formaldehyde, alkali and other raw materials, an ester compound is added in the sulfonating process, and the sulfonation rate is improved through hydrolysate circulation and recovery. The viscosity is judged according to a motor current value in the condensation heat preservation process to determine condensation degree and condensation time, an anti-sticking additive is added before spray drying, and the obtained naphthalene-based powder water reducing agent has the advantages of being low in moisture content, not prone to agglomerate and good in performance.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a naphthalene powder water reducer and a preparation method thereof. Background technique [0002] Naphthalene series high-efficiency water reducer is a non-air-entraining high-efficiency water reducer synthesized by chemical industry. The chemical name is naphthalenesulfonate formaldehyde condensate. It has a strong dispersion effect on cement particles. It has a good effect on the preparation of large fluid concrete, cast-in-place concrete and prefabricated components with early strength and high strength requirements. This has led to the rapid development of concrete engineering construction fields such as roads, bridges, water conservancy and hydropower, and has produced huge technical, economic and social benefits. [0003] In order to reduce the high cost caused by long-distance transportation and further expand the application field of naphthalene-b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/22C04B103/30
Inventor 赖华珍方云辉温庆如赖广兴杜可禄邱有陶
Owner KZJ NEW MATERIALS GROUP CO LTD