Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF1 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still room for improvement in the heat resistance stability and whiteness staining of the products produced by this process and the sanding time of the dispersant MF

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sulfonating technique for producing dye dispersant MF (melamine-formaldehyde)

Examples

Experimental program
Comparison scheme
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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07C309/36C07C303/32C07C303/22C07C303/06
Inventor 陈百龙叶华明
Owner ZHEJIANG RUNTU
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com