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Formula of acid and alkali-resistant and anti-pollution ultrafiltration membrane and preparation method thereof

An anti-pollution, ultrafiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reduced separation efficiency, poor hydrophilicity, easy pollution, etc., and achieve improved mechanical strength, strong resistance Pollution ability, effect of improving hydrophilicity

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

AI Technical Summary

Problems solved by technology

However, since polyvinylidene fluoride itself has more hydrophobic groups, the formed membrane has strong hydrophobicity, and it is easy to cause serious membrane fouling when filtering water medium materials, resulting in a decrease in separation efficiency.
In order to overcome the disadvantages of poor hydrophilicity and easy pollution of polyvinylidene fluoride membrane materials, people try to use some physical or chemical methods to modify them.

Method used

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  • Formula of acid and alkali-resistant and anti-pollution ultrafiltration membrane and preparation method thereof
  • Formula of acid and alkali-resistant and anti-pollution ultrafiltration membrane and preparation method thereof
  • Formula of acid and alkali-resistant and anti-pollution ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Prepare materials according to the following weight ratio:

[0028]

[0029] 2. Preparation of ultrafiltration membrane:

[0030] 1) Raw material drying:

[0031] The above several raw materials (except the solvent) are dried in a hot air oven at 105°C for subsequent use.

[0032] 2) Preparation of polyvinylidene fluoride-nanocellulose crystal-LiCl mixed solution

[0033] Add the dried polyvinylidene fluoride into the solvent, stir to completely dissolve the polyvinylidene fluoride, then add nanocellulose crystals, continue to stir to dissolve, continue to add LiCl, and stir well to obtain polyvinylidene fluoride-nano Cellulose crystal-LiCl mixture.

[0034] 3) Casting liquid degassing

[0035] Put polyvinylidene fluoride-nanocellulose crystals-LiCl mixture in a double-layer vacuum barrel, use a vacuum pump to decompress and degas the vacuum barrel, and pass water or oil with a controlled temperature in the interlayer of the double-layer vacuum barrel , adjus...

Embodiment 2

[0044] 1) Prepare materials according to the following weight ratio:

[0045]

[0046] The formula and process steps of preparing the film in this example are the same as Example 1 except that the formula of the film casting solution is changed from the formula described in Example 1.

[0047] The performance index of the polyvinylidene fluoride composite ultrafiltration membrane prepared in this example, the test results are shown in Table 1.

Embodiment 3

[0049] 1) Prepare materials according to the following weight ratio:

[0050]

[0051] The formula and process steps of preparing the film in this example are the same as Example 1 except that the formula of the film casting solution is changed from the formula described in Example 1.

[0052] The performance index of the polyvinylidene fluoride composite ultrafiltration membrane prepared in this example, the test results are shown in Table 1.

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Abstract

The invention discloses a formula for an acid and alkali-resistant and anti-pollution ultrafiltration membrane and a preparation method thereof. The ultrafiltration membrane is formed by coating a membrane casting liquid consisting of polyvinylidene fluoride, a nano-cellulose crystal and a pore forming agent in a certain mass ratio on a high-strength non-woven fabric substrate and adopting a non-solvent induced phase separation (NIPS) method in a phase conversion method. Due to the presence of a high-strength non-woven fabric support layer, the mechanical strength of the membrane is enhanced. The nano-cellulose crystal contains a hydrophilic group, and an ultrafiltration membrane formed by coblending the nano-cellulose crystal with the polyvinylidene fluoride can be used for overcoming the defects of poor anti-pollution capability and poor hydrophilicity of a pure polyvinylidene fluoride ultrafiltration membrane. The ultrafiltration membrane is resistant to corrosion of acids and alkalis, has high chemical stability, high water flux, high trapping characteristic, high mechanical strength and anti-pollution performance. According to the formula, the acid and alkali corrosion resistance of the membrane is enhanced, and the service life of the ultrafiltration membrane is prolonged.

Description

technical field [0001] The patent of the present invention relates to the formula and preparation method of an acid and alkali resistant anti-pollution ultrafiltration membrane, which uses a mixture of polymer compounds containing different groups to form a film, improves the film-forming hydrophilic performance of a single compound, and utilizes The mechanical strength of the non-woven substrate improves the mechanical strength of the ultrafiltration membrane, thus greatly improving the service life of the ultrafiltration membrane. technical background [0002] Membrane separation technology is a new type of alternative separation technology. With the development of membrane technology, more and more applications in the field of life and industrial production. According to the size of the target separation substance, the membrane is divided into microfiltration membrane, ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane. [0003] Membrane sepa...

Claims

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Application Information

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IPC IPC(8): B01D71/34
Inventor 汪长安张晨光黄勇
Owner TSINGHUA UNIV
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