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A kind of preparation method of hydrophilic polymer microporous filter material

A hydrophilic polymer and microporous filtration technology, applied in the field of porous materials, can solve the problems of application limitations and lack of effective means, and achieve the effects of uniform pore size distribution, thorough removal, and huge application prospects

Inactive Publication Date: 2012-02-08
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the current preparation technology of polyvinyl alcohol microporous materials, there is still a lack of effective means to control the pore size. Filter materials with a filtration accuracy in the range of 0.1-1 μm have not yet been developed, and there is still a distance from the requirements of precision filtration. Its application restricted

Method used

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  • A kind of preparation method of hydrophilic polymer microporous filter material
  • A kind of preparation method of hydrophilic polymer microporous filter material
  • A kind of preparation method of hydrophilic polymer microporous filter material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 100 g of polyvinyl alcohol with a degree of polymerization of 1799 into 750 mL of water under stirring, and gradually raise the temperature to 90° C. until the polyvinyl alcohol is completely dissolved.

[0035] When the temperature of the polyvinyl alcohol solution drops to 50°C, slowly add 180mL of 40% sulfuric acid, and the temperature of the system will rise at this time, and when the temperature drops back to 50°C, add 100mL of formaldehyde to carry out the acetalization reaction. After 10 minutes, add 20 mL of o / w emulsion of kerosene, the mass fraction of kerosene in the emulsion is 40%. Stir quickly to disperse the emulsion evenly in the colloidal phase. Then, the material mixture was poured into a plastic mold, and treated at a temperature of 50° C. for 12 hours. Finally, the mold is opened, the molding is taken out, and the residue is removed by washing with water.

[0036] SEM photographs of the materials are attached figure 1 As shown, the pore size d...

Embodiment 2

[0038] Add 100 g of polyvinyl alcohol with a degree of polymerization of 1799 into 750 mL of water under stirring, and gradually raise the temperature to 90° C. until the polyvinyl alcohol is completely dissolved.

[0039] When the temperature of the polyvinyl alcohol solution drops to 50°C, slowly add 180mL of 40% sulfuric acid and 100mL of formaldehyde, and react for 10 minutes, then add 5mL of kerosene o / w emulsion. After stirring evenly, pour the material into the prepared plastic mold and treat at 50°C for 12 hours. The mold is opened, and the material taken out is washed with water to remove residues to obtain a cross-linked polyvinyl alcohol microporous material.

[0040] SEM photographs of the materials are attached figure 2 As shown, the structure of the obtained material is similar to that obtained in Example 1. Its porosity is 88%, the maximum pore diameter measured by bubbling method is 8.64μm, and its clear water flux is 2625.0L / m under the pressure head of 1.2...

Embodiment 3

[0042] By the same method of embodiment 2, the addition of emulsified kerosene is changed to 45mL, and other compositions and operating methods are unchanged.

[0043] The obtained microporous polyvinyl alcohol material has a porosity of 90%, a maximum pore diameter of 7.30 μm measured by the bubbling method, and a clear water flux of 2176.0 L / m under a water column pressure head of 1.2 m 2 h. Use 24.5g / L ultra-fine calcium carbonate suspension as the filter material, the outlet pressure head is 1.2m water column, and some particles leak through.

[0044] The scanning electron microscope photograph of the material is as image 3 As shown, the pore structure is quite different from the materials obtained in the first two examples, the pore support is thin-walled, and the penetration of the channel is relatively low.

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Abstract

A method for preparing a hydrophilic polymer microporous filter material, belonging to the field of polymer porous materials, comprising the following steps: (1) dissolving 100 parts of polyvinyl alcohol in water to prepare 8-12% (Wt%) polyvinyl alcohol Vinyl alcohol aqueous solution; (2) Add 50-180 parts of 40% sulfuric acid and 30-200 parts of formaldehyde solution to the above-mentioned polyvinyl alcohol aqueous solution successively, and react at 20-60°C for 5-20 minutes; then add 5-50 parts o / W-type emulsion, stirring; (3) inject the above-mentioned mixed material liquid into the mould, and process it at 40-80° C. for 4-24 hours. The pore structure and pore size of the microporous polyvinyl alcohol material are adjusted. The pore size distribution of the skin layer of the material is uniform, and the interior is a structure of independent cells. The cells are connected by micropores with smaller pore diameters. The diameter of the connected micropores It is 1 / 2 to 1 / 10 of the maximum diameter of the bubble chamber, the pore diameter of the bubbling method is less than 10 μm, and the measured filtration accuracy is less than 0.3 μm.

Description

technical field [0001] The invention belongs to the field of porous materials, and relates to a hydrophilic polymer microporous filter material and a preparation method thereof. Background technique [0002] Microporous filtration is widely used in solid-liquid separation, and its fields involve many industries such as chemical industry, environmental protection, electronics, food, hygiene and medicine. Due to its convenient molding and processing, polymer materials have become an important filter material, among which microporous polypropylene and microporous polyethylene are the most representative. When water passes through the tiny pores of hydrophobic materials, the pressure loss is relatively large. Therefore, the use of microporous polypropylene and microporous polyethylene requires high filtration pressure and high energy consumption. In addition, limited by the mechanical properties of the material, the porosity of microporous polypropylene and microporous polyethy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28B01D67/00B01D39/16B01D69/04B01D71/38
Inventor 张文龙李茂康刘燕燕张小林
Owner NANCHANG UNIV
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