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

A kind of preparation method of low molecular weight sodium polyacrylate

A technology of sodium polyacrylate and low molecular weight, which is used in the preparation of dispersants and the preparation of solid sodium acrylate, which can solve the problems of long reaction time and high energy consumption, achieve good results, reduce reaction time, improve reaction efficiency and conversion rate effect

Active Publication Date: 2018-12-14
大茂环保新材料股份有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the synthesis process of sodium polyacrylate, in order to improve the conversion rate of the reaction, it is necessary to adopt the feeding method of dropwise addition, which takes a long reaction time and consumes a lot of energy.

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 molecular weight sodium polyacrylate
  • A kind of preparation method of low molecular weight sodium polyacrylate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of low molecular weight sodium polyacrylate, comprising the steps of:

[0020] A. Disperse 160 parts of acrylic acid, 480 parts of water, and 0.04 parts of graphene under ultrasonic conditions of 35 kHz and 150 W for 12 minutes;

[0021] B. Transfer the liquid into the reaction kettle, set the stirring speed to 130rpm, lower the temperature to 9°C, stir for 18min, and inject nitrogen for 16min;

[0022] C, add concentration successively and be 5-10 parts of 15% sodium hydroxide solution, 4 parts of chelating agent, 3 parts of initiator aqueous solution, regulate stirring speed and be 185rpm, feed nitrogen continuously during stirring, stir evenly, obtain monomer phase;

[0023] D. Slowly raise the temperature to 65°C and react for 1.5 hours. After the reaction is over, stop nitrogen filling, heat up to 85°C and then distill. The distillation time is 2 hours;

[0024] E. After the distillation is completed, the product is packaged and stored.

[00...

Embodiment 2

[0028] A preparation method of low molecular weight sodium polyacrylate, comprising the steps of:

[0029] A. Disperse 180 parts of acrylic acid, 400 parts of water, and 0.05 parts of graphene under ultrasonic conditions of 35 kHz and 150 W for 12 minutes;

[0030] B. Transfer the liquid into the reaction kettle, set the stirring speed to 120rpm, lower the temperature to 10°C, stir for 15min, and pass nitrogen gas for 20min;

[0031] C, add concentration successively and be 5 parts of 15% sodium hydroxide solution, 3 parts of chelating agent, 5 parts of initiator aqueous solution, regulate stirring speed and be 180rpm, constantly pass into nitrogen during stirring, stir evenly, obtain monomer phase;

[0032] D. Slowly raise the temperature to 60°C and react for 1.5 hours. After the reaction is over, stop nitrogen filling, heat up to 80-90°C and then distill. The distillation time is 1 hour;

[0033] E. After the distillation is completed, the product is packaged and stored. ...

Embodiment 3

[0037] A preparation method of low molecular weight sodium polyacrylate, comprising the steps of:

[0038] A. Disperse 180 parts of acrylic acid, 600 parts of water, and 0.03 parts of graphene for 15 minutes under ultrasonic conditions of 35 kHz and 150 W;

[0039] B. Transfer the liquid into the reaction kettle, set the stirring speed to 150rpm, lower the temperature to 8°C, stir for 15min, and inject nitrogen for 20min;

[0040] C, add concentration successively and be 10 parts of 15% sodium hydroxide solution, 5 parts of chelating agent, 2 parts of initiator aqueous solution, adjust stirring speed to be 200rpm, feed nitrogen continuously during stirring, stir evenly, obtain monomer phase;

[0041] D. Slowly raise the temperature to 70°C and react for 1 hour. After the reaction is over, stop nitrogen filling, heat up to 80°C and then distill. The distillation time is 1.5 hours;

[0042] E. After the distillation is completed, the product is packaged and stored.

[0043] De...

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 discloses a method for preparing low-molecular-weight sodium polyacrylate. Graphene is added and subjected to ultrasonic dispersion, graphene is evenly distributed in a solution, acrylic acid molecules can also be evenly dispersed on the surface of graphene, and then sodium hydroxide, a chelating agent and an initiator are added, so it can be guaranteed that reaction happens on the surface of graphene, various raw materials can be added at a time in the reaction process and do not need to be added in several times, reaction time is shortened, reaction efficiency is improved, and the conversion rate is increased. A chain transfer agent is added, the molecular weight of the product is controlled to be 500-5000, molecular weight distribution of the product is uniform, and when used as a dispersion agent later, the product is good in effect.

Description

technical field [0001] The invention relates to a preparation method of a dispersant, which belongs to the field of polymer synthesis, in particular to a preparation method of solid sodium acrylate. Background technique [0002] Polyacrylic acid and its sodium salt are widely used in coatings, metallurgy, medicine, cosmetics, etc. because of their excellent physical and chemical properties, such as thickening, suspension dispersion, flocculation, and washing aid. It has unique applications in food additives, flocculation of aluminum red mud, and treatment of animal and vegetable protein wastewater. Although the polymerization of sodium acrylate aqueous solution has the advantages of convenient implementation, simple equipment, low product gel content and stable system. Nalco of the United States and Catalyst Chemical Company of Japan have adopted the belt polymerization process to solve the problems of heat transfer and stirring, but the equipment cost is high and the contr...

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): C08F120/06C08F2/38C08K3/04
CPCC08F2/38C08F120/06C08K3/04
Inventor 张水永
Owner 大茂环保新材料股份有限公司