Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of low contamination dispersant MF

A technology of dispersant and methylnaphthalene is applied in the field of preparation of dispersant MF, which can solve the problems of serious contamination and deep color of MF, and achieve the effects of easy control of reaction conditions, improvement of sulfonation degree and simple process.

Active Publication Date: 2021-10-08
ZHEJIANG LONGSHENG CHEM RES
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The MF obtained by conventional methods is not only dark in color, but also has serious staining properties

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
  • A kind of preparation method of low contamination dispersant MF
  • A kind of preparation method of low contamination dispersant MF

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Sulfonation: Add 71g (0.5mol, all calculated as methylnaphthalene, the same below) of methylnaphthalene to the four-necked flask, and start to add 60g (0.6mol) of 98% sulfuric acid dropwise after the material is heated to 100°C , control the dropping temperature at 115°C, and control the acid dropping time at 20-30min. After the dropwise addition, the temperature was raised to 121° C. and kept at this temperature for 3 hours. At the end of the reaction, 15 g of water was added to control the acidity of the feed solution at 30%, to obtain the sulfonated feed.

[0027] 2. Condensation: adjust the acidity of the sulfonated material to 24.5% by adding 30g of water. After the temperature of the material drops to 85°C, start to add 27g (0.32mol) of 37% formaldehyde solution dropwise. , and kept at this temperature for 3.5h.

[0028] 3. Neutralization: Add 75g of water to the condensed material after heat preservation and stir evenly, then pre-neutralize with 15g of lime, ...

Embodiment 2

[0030] 1. Sulfonation: Add 75g (0.53mol) of methylnaphthalene to a four-necked flask, and when the temperature of the material rises to 100°C, start to add 65g (0.65mol) of 98% sulfuric acid dropwise, and control the dropping temperature to 125°C. The time is controlled at 20-30min. After the dropwise addition, the temperature was raised to 130° C. and kept at this temperature for 3 hours. At the end of the reaction, 18 g of water was added to control the acidity of the feed solution at 30%, to obtain the sulfonated feed.

[0031] 2. Condensation: Adjust the acidity of the sulfonated material to 26% by adding 30g of water. After the temperature of the material drops to 85°C, start to add 27g (0.32mol) of 37% formaldehyde solution dropwise. After the dropwise addition, heat up to 110°C and start to keep warm , and kept at this temperature for 3.5h.

[0032] 3. Neutralization: Add 79.5g of water to the condensed material after heat preservation and stir evenly, then pre-neutral...

Embodiment 3

[0034] 1. Sulfonation: Add 70g (0.49mol) of methylnaphthalene to the four-necked flask, and when the temperature of the material reaches 100°C, start to add 68g (0.62mol) of 90% sulfuric acid dropwise, and control the dropping temperature to 125°C. The time is controlled at 20-30min. After the dropwise addition, the temperature was raised to 127° C. and kept at this temperature for 3 hours. At the end of the reaction, 13 g of water was added to control the acidity of the feed solution at 31%, to obtain the sulfonated feed.

[0035] 2. Condensation: adjust the acidity of the sulfonated material to 25% by adding 37g of water. After the material temperature drops to 85°C, start to add 27g (0.32mol) of 37% formaldehyde solution dropwise. After the dropwise addition, raise the temperature to 110°C and start to keep warm , and kept at this temperature for 3.5h.

[0036] 3. Neutralization: Add 79g of water to the condensed material after heat preservation and stir evenly, then pre-n...

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

A method for preparing a low-contamination dispersant MF, the method is as follows: add methylnaphthalene to a reaction vessel, raise the temperature to 80-100°C, add sulfuric acid dropwise, and control the system temperature at 100-130°C during the dropwise addition , after dripping, heat up to 120-140°C for 3-5 hours of heat preservation reaction, add water at the end of the reaction to control the acidity of the feed solution at 29-31%, and obtain the sulfonated material; adjust the acidity of the sulfonated material to 24-27% by adding water, and then When the temperature of the material drops to 80-90°C, formaldehyde is added dropwise. After the drop is completed, the temperature is raised to 105-125°C and the reaction is kept for 3-5 hours to obtain the condensation material; add water to the condensation material to dilute, then pre-neutralize with lime, and then Add lye to neutralize until the pH is 7.0-9.0, and filter while hot to obtain the dispersant MF; the dispersant MF obtained by this method has light color, good thermal stability and low staining property.

Description

(1) Technical field [0001] The invention relates to a preparation method of a dispersant MF, in particular to a preparation method of a low-contamination dispersant MF. (2) Background technology [0002] Dispersant MF is a widely used dye auxiliaries. Its preparation method is to use industrial methylnaphthalene or washing oil as raw material, obtain methylnaphthalenesulfonic acid through sulfonation, and then condense with formaldehyde, and then neutralize, Spray dry to get powdery finished product. [0003] The technology of producing MF both at home and abroad is mainly divided into two kinds at present: one is main raw material with the methyl naphthalene that is processed or not through processing, then is the sulfuric acid of 98% with concentration as sulfonating agent, adopts methyl naphthalene: The mass ratio of sulfuric acid is 1:(1-1.1) for sulfonation, and condensation with formaldehyde under high acidity (27-32%), and then neutralized by lime and liquid caustic ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/32C07C309/36
CPCC07C303/22C07C303/32C07C309/36
Inventor 何旭斌徐伟朱敬鑫张桂香王森峰吴建伟
Owner ZHEJIANG LONGSHENG CHEM RES