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Modifying method of cellulose acetate filtration membrane

A cellulose acetate and filter membrane technology, applied in the field of membrane separation, can solve problems such as difficulty in popularization, and achieve the effects of improving mechanical strength, avoiding reduction of retention rate and reducing reproduction.

Active Publication Date: 2014-02-05
CHINA HAISUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is only suitable for special wastewater treatment processes, and it is difficult to popularize

Method used

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  • Modifying method of cellulose acetate filtration membrane
  • Modifying method of cellulose acetate filtration membrane
  • Modifying method of cellulose acetate filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Performance parameters of cellulose acetate membrane:

[0024] The thickness of the cellulose acetate filter membrane is 100 μm, the average pore size is 1.0 μm, the porosity is 80%, and the water flux is 200ml·cm under the condition of ΔP=100KPa -2 min -1 .

[0025] 2. Modification of cellulose acetate filter membrane:

[0026] The first step: dissolving polyethylene glycol PEG-200 and polycarbonate diol in acetone solvent to prepare a hydrophilic modification solution.

[0027] The second step: soak the cellulose acetate filter membrane in the hydrophilic modification solution to fully wet it, add the crosslinking agent 1,4-cyclohexane diisocyanate and the catalyst dilauric acid diisocyanate to the hydrophilic modification solution successively. The grafting reaction of butyltin was carried out, the grafting reaction temperature was 80° C., and the reaction time was 30 minutes.

[0028] Step 3: Take out the reacted cellulose acetate filter membrane and drain it...

Embodiment 2

[0036] 1. Performance parameters of cellulose acetate membrane

[0037] The thickness of the cellulose acetate filter membrane is 110 μm, the average pore size is 0.8 μm, the porosity is 78%, and the water flux is 162ml·cm under the condition of ΔP=100KPa -2 min -1 .

[0038] 2. Modification of cellulose acetate filter membrane:

[0039] The first step: dissolving polyethylene glycol PEG-400 and polycarbonate diol in acetone solvent to prepare a hydrophilic modification solution.

[0040] The second step: soak the cellulose acetate filter membrane in the hydrophilic modification solution to fully wet it, add the crosslinking agent 1,4-cyclohexane diisocyanate and the catalyst dilauric acid diisocyanate to the hydrophilic modification solution successively. Butyl tin is used for grafting reaction, the grafting reaction temperature is 80° C., and the reaction time is 30 minutes.

[0041] Step 3: Take out the reacted cellulose acetate filter membrane and drain it naturally un...

Embodiment 3

[0048] 1. Performance parameters of cellulose acetate membrane:

[0049] The thickness of the cellulose acetate filter membrane is 125 μm, the average pore size is 0.6 μm, the porosity is 76%, and the water flux is 127ml cm under the condition of ΔP=100KPa -2 min -1.

[0050] 2. Modification of cellulose acetate filter membrane:

[0051] The first step: dissolving polyethylene glycol PEG-600 and polycarbonate diol in acetone solvent to prepare a hydrophilic modification solution.

[0052] The second step: soak the cellulose acetate filter membrane in the hydrophilic modification solution to fully wet it, add the crosslinking agent 1,4-cyclohexane diisocyanate and the catalyst dilauric acid diisocyanate to the hydrophilic modification solution successively. Butyl tin is used for grafting reaction, the grafting reaction temperature is 80° C., and the reaction time is 30 minutes.

[0053] Step 3: Take out the reacted cellulose acetate filter membrane and drain it naturally un...

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Abstract

The invention provides a modifying method of a cellulose acetate filtration membrane. The modifying method of the cellulose acetate filtration membrane is characterized by comprising the following specific steps: step 1, dissolving polyethylene glycol and polycarbonate dihydric alcohol into an acetone solvent so as to prepare a hydrophilic modified solution; step 2, immersing the cellulose acetate filtration membrane completely in the hydrophilic modified solution to moisten fully, sequentially adding a cross-linking agent 1, 4-cyclohexyl diisocyanate and a catalyst dibutyltin dilaurate to the hydrophilic modified solution, and carrying out grafting reaction directly; step 3, taking out the reacted cellulose acetate filtration membrane, draining off naturally until a dissociated solution in the filtration membrane is removed, heating, curing again, and drying completely, thereby preparing the modified cellulose acetate filtration membrane. The modified cellulose acetate filtration membrane prepared by the invention is higher in hydrophilia and pollution-prevention performance.

Description

technical field [0001] The invention relates to a method for modifying a cellulose acetate filter membrane, belonging to the technical field of membrane separation. Background technique [0002] Cellulose acetate filter membrane is prepared by casting cellulose acetate solution into film, evaporating solvent, phase separation to cause pores, and drying. It is widely used in drug separation, wastewater treatment, air purification and other fields. The average pore size of cellulose acetate filter membrane is generally 0.2-1.0 μm, which can directly filter larger particles in suspension, and can also be used as pretreatment of ultrafiltration, nanofiltration and reverse osmosis membrane in wastewater treatment process. The disadvantage of cellulose acetate filter membrane is that it is not resistant to microbial corrosion, acid and alkali resistance, and easy to be degraded. [0003] The published CN1377727A uses polyurethane and cellulose acetate to blend the membrane, which...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D69/02B01D67/00
Inventor 杨娇吴立群
Owner CHINA HAISUM ENG
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