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

Preparation method of starch grafted acrylamide flocculating agent

A technology of acrylamide and starch grafting, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of low efficiency, low grafting rate of copolymer grafting efficiency, and unrepeatable, etc., and achieve high solid content and large molecular weight , the effect of high polymerization rate

Inactive Publication Date: 2011-10-05
GUANGZHOU UNIVERSITY
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the article claims that the emulsification system in its method is a compound emulsifier, it only discloses one of the components of the compound emulsifier - Span80, and those skilled in the art cannot repeat this without knowing the remaining components of the emulsifier. method and achieve the effect claimed in the article
In addition, the method of this paper uses ammonium persulfate as the initiator of the polymerization reaction. Although ammonium persulfate can effectively initiate the graft copolymerization of starch acrylamide, the efficiency of the initiation reaction is low, resulting in the grafting rate of the copolymer (highest About 85%) and grafting efficiency (less than 60%) are relatively low

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
  • Preparation method of starch grafted acrylamide flocculating agent
  • Preparation method of starch grafted acrylamide flocculating agent

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Take 40g of liquid paraffin, 2.24g of Span80, 0.16g of Tween 80 and 0.80g of OP-4 in a three-necked flask, stir to dissolve, add 30mL of water and 6.7g of starch, and stir until an inverse emulsion is formed. The conductivity is close to 0, and the stability of the emulsion is close to 1.

[0024] Pass nitrogen into the above-mentioned emulsion until the oxygen in the three-necked flask is completely removed, heat to 50°C, continue to pass nitrogen and stir, add dropwise 1mL of potassium permanganate solution with a mass concentration of 1%, stir for 20min, add 50% potassium permanganate solution Acrylamide solution 18.8g, react for 3h, stop stirring; transfer the mixture in the beaker to a 1000mL beaker, add ethanol after cooling to room temperature, stir until no solid product is formed, filter and separate the solid in the beaker, and use ethanol and acetone Wash and filter repeatedly until the filter cake is loose and small particles, and finally dry to the moisture...

example 2

[0026] Take 46g of liquid paraffin, 3.6g of Span80, 0.1g of Tween 80 and 0.3g of OP-4 in a three-necked flask, stir for 4 to dissolve, add 29.2g of water and 6.7g of starch, and stir until an inverse emulsion is formed. The conductivity is close to 0, and the stability of the emulsion is close to 1.

[0027] Introduce nitrogen into the above-mentioned emulsion until the oxygen in the three-necked flask is completely removed, continue nitrogen and stirring, add 10.8g of 50% acrylamide solution, heat to 40°C, add dropwise 0.6mL of 1% potassium permanganate solution, and react 7h, stop stirring, transfer the mixture in the beaker to a 1000mL beaker, add ethanol after cooling to normal temperature, stir until a solid product is obtained, filter to separate the solid in the beaker from the mixture, and wash the filter cake with ethanol and acetone repeatedly to the filter cake It is loose and small particles, and finally vacuum-dried to the moisture content required by the product....

example 3

[0028] Example 3 Take 27g of liquid paraffin, 0.7g of Span80, 0.05g of Tween 80, and 0.25g of OP-4 in a three-necked flask, stir to dissolve, add 27.6g of water, 6.7g of starch, stir until an inverse emulsion is formed, and measure its conductivity The ratio is close to 0 and the emulsion stability is close to 1.

[0029] Pass nitrogen into the above emulsion until the oxygen in the three-necked flask is completely removed, continue to pass nitrogen and stir, add dropwise 3mL of 1% potassium permanganate solution, stir for 20min, add 26.8g of 50% acrylamide solution, and heat to 60°C , react for 1h, stop stirring, move the mixture in the beaker into a 1000mL beaker, add ethanol after cooling to normal temperature, stir until a solid product is obtained, filter the solid in the beaker from the mixture, and wash the filter cake repeatedly with ethanol and acetone until The filter cake is loose and small particles, and finally vacuum-dried to the moisture content required by the ...

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

PropertyMeasurementUnit
grafting efficiencyaaaaaaaaaa
grafting efficiencyaaaaaaaaaa
grafting efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of a starch grafted acrylamide flocculating agent, which comprises the following concrete step of polymerizing starch and acrylamide in a reversed emulsion formed by liquid paraffin, water and a compounded emulsifying agent to form a graft copolymer of the starch and the acrylamide, wherein potassium permanganate is used as an initiator, and the compounded emulsifying agent comprises span 80, Tween 80 and alkylphenol polyoxyethylene (4) in a mass ratio of 7-9:0.1-0.5:0.9-2.5. The method adopts the compounded emulsifying agent comprising the span 80,the Tween 80 and the alkylphenol polyoxyethylene (4) for preparing the reversed emulsion, thereby stabilizing the system of the reversed emulsion, providing a stable reaction environment for polyreaction, and being helpful for improving the stability of products. In addition, in the method, the potassium permanganate is also selected as the initiator, thereby effectively improving the efficiency of initiating the polyreaction.

Description

technical field [0001] The invention relates to the field of organic chemistry, in particular to a polymer compound obtained by reacting only carbon-carbon unsaturated bonds. Background technique [0002] Organic flocculants refer to natural or synthetic organic molecular substances that can produce flocculation. Natural organic flocculants are protein or polysaccharide compounds, such as starch, protein, animal glue, sodium alginate, sodium carboxymethylcellulose, etc.; synthetic organic flocculants include polyacrylamide, sodium polyacrylate, polyethylene Pyridinium salt, polyethyleneimine, etc. These flocculants are all water-soluble linear polymer substances, most of which can be ionized in water, and are polymer electrolytes. According to the characteristics of their dissociated groups, they can be divided into anion, cation and amphoteric types. After the flocculant is ionized in water, its chain molecules can produce bonding and bridging effects, and the charged gro...

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): C08F251/00C08F2/32C08F220/56C02F1/56C08F4/26
Inventor 尚小琴王东耀刘汝锋
Owner GUANGZHOU UNIVERSITY
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