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,

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

Example Embodiment

[0033] Example 1:

[0034] Dissolve carboxymethyl cellulose (anion substitution degree of about 80%, weight average molecular weight of about 150,000) in pure water to prepare a 0.5% solution of carboxymethyl cellulose. After the solution is uniform, add ammonium persulfate as initiator (Additional amount is 2% of the moles of carboxymethyl cellulose unit), then add acrylamide (mass ratio to carboxymethyl cellulose: 5:1), react at 45°C for 3 hours, then use acetone as precipitation The product is separated by precipitation to obtain grafted carboxymethyl cellulose. Disperse the 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 the grafted carboxymethyl cellulose in the mixed solvent is 1%), add Sodium hydroxide (the mass percentage of sodium hydroxide in the mixed solvent is 2%), react at 55°C for 3 hours, filter and dry after the reaction, to prepare a hydrolyzed grafted enhanced anioni...

Example Embodiment

[0035] Example 2:

[0036] Dissolve carboxymethyl cellulose (anion substitution degree of about 90%, weight average molecular weight of about 250,000) in pure water to prepare a 0.1% solution of carboxymethyl cellulose. After the solution is uniform, add ammonium persulfate as initiator (Addition amount is 3% of carboxymethyl cellulose unit moles), then add acrylamide (to carboxymethyl cellulose mass ratio: 2:1), react at 55℃ for 2 hours, then use acetone as precipitation The product is separated by precipitation 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%), add Sodium hydroxide (the mass percentage of sodium hydroxide in the mixed solvent is 8%), react at 60°C for 0.1 hours, filter and dry after the reaction, to prepare a hydrolyzed grafted enhanced anionic carboxymethyl...

Example Embodiment

[0037] Example 3:

[0038] Dissolve carboxymethyl cellulose (anion substitution degree about 85%, weight average molecular weight about 400,000) in pure water to prepare a 3% solution of carboxymethyl cellulose. After the solution is uniform, add potassium persulfate as a trigger (Additional amount is 1% of the mole number of carboxymethylcellulose unit), then add acrylamide (mass ratio to carboxymethylcellulose: 6:1), react at 50℃ for 2 hours, and then use ethanol as precipitation The product is separated by precipitation to obtain grafted carboxymethyl cellulose. Disperse the 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%), add Sodium hydroxide (the mass percentage of sodium hydroxide in the mixed solvent is 5%), react at 35°C for 5 hours, filter and dry after the reaction, to prepare a hydrolyzed grafted enhanced anionic c...

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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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