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Hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent and preparation method thereof

A carboxymethyl cellulose, anion technology, applied in the direction of flocculation / sedimentation water / sewage treatment, etc., can solve the problems of low molecular weight, sensitive flocculation effect, etc. Effect

Inactive Publication Date: 2013-06-26
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carboxymethyl cellulose also has many shortcomings in practical applications, such as: relatively low molecular weight, flocculation effect is sensitive to pH, etc.

Method used

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  • Hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent and preparation method thereof
  • Hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent and preparation method thereof
  • Hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Dissolve carboxymethyl cellulose (the degree of anionic substitution is about 80%, and the weight average molecular weight is about 150,000) in pure water to prepare a 0.5% solution of carboxymethyl cellulose. After the solution is uniform, add ammonium persulfate as a trigger agent (the amount added is 2% of the molar number of carboxymethyl cellulose units), then add acrylamide (mass ratio to carboxymethyl cellulose: 5:1), react at 45°C for 3 hours, and then use acetone as a precipitate agent, precipitate and separate the product to obtain grafted carboxymethyl cellulose. Disperse grafted carboxymethyl cellulose in a mixed solvent of water and ethanol (the mass ratio of water to ethanol is 1:6, and the mass percentage of grafted carboxymethyl cellulose in the mixed solvent is 1%), adding Sodium hydroxide (sodium hydroxide accounts for 2% by mass of the mixed solvent), reacted at 55°C for 3 hours, filtered and dried after the reaction, and prepared a hydrolyzed grafted ...

Embodiment 2

[0036] Dissolve carboxymethyl cellulose (anion substitution degree is about 90%, weight average molecular weight is about 250,000) in pure water to prepare a 0.1% solution of carboxymethyl cellulose. After the solution is uniform, add ammonium persulfate as a trigger agent (the amount added is 3% of the molar number of carboxymethyl cellulose units), then add acrylamide (mass ratio to carboxymethyl cellulose: 2:1), react at 55°C for 2 hours, and then use acetone as a precipitate agent, precipitate and separate the product to obtain grafted carboxymethyl cellulose. Disperse grafted carboxymethyl cellulose in a mixed solvent of water and ethanol (the mass ratio of water to ethanol is 1:2, and the mass percentage of grafted carboxymethyl cellulose in the mixed solvent is 10%), adding Sodium hydroxide (sodium hydroxide accounts for 8% by mass of the mixed solvent), reacted at 60°C for 0.1 hour, filtered and dried after the reaction, and prepared a hydrolyzed grafted enhanced anion...

Embodiment 3

[0038] Dissolve carboxymethyl cellulose (anion substitution degree is about 85%, weight average molecular weight is about 400,000) in pure water to prepare a 3% carboxymethyl cellulose solution. After the solution is uniform, add potassium persulfate as a trigger agent (addition amount is 1% of the molar number of carboxymethyl cellulose units), then add acrylamide (mass ratio to carboxymethyl cellulose: 6:1), react at 50°C for 2 hours, and then use ethanol as a precipitate agent, precipitate and separate the product to obtain grafted carboxymethyl cellulose. Disperse grafted carboxymethyl cellulose in a mixed solvent of water and ethanol (the mass ratio of water to ethanol is 1:10, and the mass percentage of grafted carboxymethyl cellulose in the mixed solvent is 5%), adding Sodium hydroxide (sodium hydroxide accounted for 5% by mass of the mixed solvent), reacted at 35°C for 5 hours, filtered and dried after the reaction, and prepared a hydrolyzed grafted enhanced anionic ca...

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Abstract

The invention discloses a hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent. The hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent is characterized by being obtained by carrying out hydrolysis reaction onto graft carboxymethyl cellulose under alkali condition, wherein the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent has the structure shown in the specification; the mass of polyacrylamide is 5%-65% of that of the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent; and the mass of the polyacrylic acid is 5%-70% of the that of the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent. The hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent disclosed by the invention has the triple characteristic of carboxymethyl anionic group, polyacrylamide and polyacrylic acid. Moreover, the carboxymethyl anionic group, polyacrylamide and polyacrylic acid are linked by chemical bonds, so that the molecular weight of carboxymethyl cellulose is improved and the bonding and bridging flocculation is enhanced. Besides, the soluble pH range of the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent is expanded due to the existence of the grafting chain, and therefore, the pH sensitivity of the flocculation effect of carboxymethyl cellulose is effectively restrained.

Description

technical field [0001] The invention relates to a hydrolysis graft type enhanced anionic carboxymethyl cellulose flocculant and a preparation method thereof. Background technique [0002] Water is the foundation upon which all life on earth depends. However, with the rapid development of industry in recent years, the problem of water pollution has become more and more serious, and it has become one of the biggest environmental problems facing mankind today. According to the UN-Water World Assessment Report, millions of tons of garbage are dumped into rivers, lakes and streams around the world every day; all rivers flowing through Asian cities are polluted. [0003] The situation of my country's water resources is even less optimistic. Rivers and lakes in my country are generally polluted. The seven major water systems, major lakes, coastal waters, and groundwater in some areas are seriously polluted. 90% of the water flowing through cities does not meet the standards for d...

Claims

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Application Information

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IPC IPC(8): C08F251/02C08F8/12C02F1/56
Inventor 杨琥杨朕蔡涛李海江李爱民
Owner NANJING UNIV
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