Sulfonating technique for producing dye dispersant MF (melamine-formaldehyde)

A dye dispersant and production process technology, which is applied in the preparation of sulfonic acid, organic chemistry, sulfonate preparation, etc., to achieve the effects of simple production process, short sanding time, and avoiding calcium sulfate residue

Active Publication Date: 2012-10-24
ZHEJIANG RUNTU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still room for improvement in the heat resistance stability and whiten...

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  • Sulfonating technique for producing dye dispersant MF (melamine-formaldehyde)

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 100 grams of industrial methylnaphthalene and put it into a 500ml four-necked flask with a stirrer and a thermometer, start stirring, heat up to 50°C, add 17.6 grams of 98% sulfuric acid dropwise, and then slowly introduce 47.9 grams of sulfur trioxide. The temperature does not exceed 80°C. After the addition, keep the reaction for 1 hour, then raise the temperature to 150°C, turn on the vacuum 0.05-0.06MPa, keep the reaction for 3 hours, check the acid value to 25%, cool to 120°C, add water to the acid value After the concentration is 21%, cool to 80°C, add 45 grams of 37% formaldehyde solution dropwise, control the temperature not to exceed 100°C, after the addition, heat up to 100-110°C for condensation reaction for 4 hours. Then add 30% liquid caustic soda for neutralization. The neutralizing material was dried, and the obtained amount was 190 grams.

Embodiment 2

[0027] Weigh 100 grams of industrial methylnaphthalene and put it into a 500ml four-neck flask with a stirrer and a thermometer, start stirring, heat up to 50°C, add 24.6 grams of 98% sulfuric acid dropwise, and then slowly introduce 53.5 grams of sulfur trioxide. The temperature does not exceed 80°C. After the addition, keep the reaction for 1 hour, then raise the temperature to 150°C, turn on the vacuum of 0.05-0.06MPa, keep the reaction for 3 hours, check the acid value of 28%, cool to 120°C, add water to a certain acidity After the value is 21%, cool to 80°C, add 45 grams of 37% formaldehyde solution dropwise, control the temperature not to exceed 100°C, after the addition, heat up to 100-110°C for condensation reaction for 4 hours. Then add 30% liquid caustic soda for neutralization. The neutralizing material was dried, and the obtained amount was 199 grams.

Embodiment 3

[0029] Weigh 100 grams of industrial washing oil and put it into a 500ml four-neck flask equipped with a stirrer and a thermometer, start stirring, raise the temperature to 50°C, add 17.6 grams of 98% sulfuric acid dropwise, and then slowly introduce 47.9 grams of sulfur trioxide. No more than 80°C. After the addition, keep the reaction for 1 hour, then raise the temperature to 140°C, turn on the vacuum of 0.05-0.06MPa, keep the reaction for 3 hours, check the acid value of 26%, cool to 120°C, add water to a certain acid value After 21%, cool to 80°C, add 45 grams of 37% formaldehyde solution dropwise, control the temperature not to exceed 100°C, after the addition, heat up to 100-110°C for condensation reaction for 4 hours. Then add 30% liquid caustic soda for neutralization. The neutralized material was dried, and the obtained amount was 185 grams.

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Abstract

The invention relates to a production technique of a dye dispersant MF (melamine-formaldehyde), which comprises the following steps: adding concentrated sulfuric acid into a naphthalene compound, introducing sulfuric anhydride at the temperature of not higher than 80 DEG C to carry out reaction, heating the temperature of the system to 130-160 DEG C, carrying out reaction while keeping the temperature, and adding formaldehyde to carry out condensation; and after the condensation finishes, adding an alkali to regulate the pH value to neutral, thereby obtaining the dispersant MF, wherein the naphthalene compound/sulfuric acid/sulfuric anhydride mol ratio is 1:(0.2-0.4):(0.8-1). The dispersant MF produced by the technique provided by the invention has the advantages of high heat stability, favorable whiteness staining and short sanding time.

Description

technical field [0001] The invention relates to a production process of dye dispersant MF (methylnaphthalenesulfonic acid formaldehyde condensate or naphthalenesulfonic acid formaldehyde condensate). Background technique [0002] Dispersant MF is the most commonly used dye dispersant for disperse dyes and vat dyes in the world. It is very popular because of its good dispersing effect and low price. [0003] Publication number is that CN101376639A discloses a kind of method that new sulfonation process produces dispersant MF, and it comprises, adds the sulfuric acid of concentration more than 95% in methylnaphthalene raw material, feeds sulfur trioxide and carries out sulfonation reaction; The generated sulfur dioxide gas is absorbed by lye to prepare sodium sulfite; the solution after the sulfonation reaction is adjusted to a certain condensation acidity by adding water, then condensed by adding formaldehyde solution, after the condensation is completed, add water to dilute,...

Claims

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Application Information

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IPC IPC(8): C07C309/36C07C303/32C07C303/22C07C303/06
Inventor 陈百龙叶华明
Owner ZHEJIANG RUNTU
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