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Method for preparing hydrophilic modified polyvinylidene fluoride membrane

A technology of polyvinylidene fluoride film and polyvinylidene fluoride, which is applied in the field of preparing hydrophilic modified polyvinylidene fluoride film, can solve the problems that polyvinylidene fluoride film is easily polluted, achieve good self-cleaning performance, and be easy to promote , the effect of low equipment

Inactive Publication Date: 2015-08-26
上海氢尚新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a method for preparing a hydrophilic modified polyvinylidene fluoride membrane, which can overcome the disadvantages of the prior art when the polyvinylidene fluoride membrane is used in the fields of sewage treatment and the like. Defects that are easy to be polluted, the process is simple, easy to operate, does not require expensive instruments, and is easy to promote. The prepared hydrophilic modified polyvinylidene fluoride membrane has good cleaning and hydrophilic modification. It is used in sewage treatment, biochemical industry, etc. The field has potential wide application value

Method used

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  • Method for preparing hydrophilic modified polyvinylidene fluoride membrane
  • Method for preparing hydrophilic modified polyvinylidene fluoride membrane
  • Method for preparing hydrophilic modified polyvinylidene fluoride membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) Preparation of PVDF membrane containing AIBN initiator: Take 4g of PVDF powder and dissolve 0.7g of PVP in 22ml of N,N-dimethylacetamide (DMAc), configure PVDF casting solution, and stir at 65°C until uniform. The casting solution was degassed in vacuum, scraped evenly onto the glass plate with a scraper with a thickness of 200 μm, and placed in a deionized water coagulation bath. After the film was detached from the glass plate, soak it in deionized water for 48 hours to remove the residual solvent and then dry it. After immersing the obtained PVDF original film in the acetone solution of AIBN for 30 minutes, take it out and dry it under vacuum at room temperature to obtain the PVDF film containing the initiator.

[0050]2) Grafting KH570 on the surface of PVDF membrane: Put 3 pieces of original PVDF membranes (3cm×3cm) containing AIBN into a three-necked flask filled with 30ml of toluene, and add 3g of KH570. Nitrogen was passed for 30 minutes to remove the air, a...

Embodiment 2

[0055] 1) Preparation of PVDF membrane containing AIBN initiator: same as Step 1 of Example 1.

[0056] 2) Grafting KH570 on the surface of PVDF membrane: Put 3 pieces of original PVDF membranes (3cm×3cm) containing AIBN into a three-necked flask filled with 30ml of toluene, and add 3g of KH570. Nitrogen was passed for 30 minutes to remove the air, and then the flask was moved into a 70° oil bath to react for 2 hours. Stir and wash the reacted membrane with deionized water at 70° C. for 3 times, and dry to obtain the KH570-grafted polyvinylidene fluoride membrane.

[0057] 3) Preparation of hydrophilic modified polyvinylidene fluoride membrane: same as Step 3 of Example 1.

[0058] In contrast to this example, the PVDF membrane without surface modification had a contact angle of 112.2° with water. In this example, the contact angle between the PVDF membrane and water dropped to 64.3° after surface modification. Using bovine serum albumin (BSA) as a pollutant, it was determin...

Embodiment 3

[0060] 1) Preparation of PVDF membrane containing AIBN initiator: same as Step 1 of Example 1.

[0061] 2) Grafting KH570 on the surface of PVDF membrane: Put 3 pieces of original PVDF membranes (3cm×3cm) containing AIBN into a three-necked flask filled with 30ml of toluene, and add 3g of KH570. Nitrogen was passed for 30 minutes to remove the air, and then the flask was moved into a 70° oil bath to react for 3 hours. Stir and wash the reacted membrane with deionized water at 70° C. for 3 times, and dry to obtain the KH570-grafted polyvinylidene fluoride membrane.

[0062] 3) Preparation of hydrophilic modified polyvinylidene fluoride membrane: same as Step 3 of Example 1.

[0063] The comparative experiment with this example is a PVDF membrane without surface modification, and its contact angle with water reaches 112.2°. In this example, the contact angle between the PVDF membrane and water decreased to 59.8° after surface modification. Using bovine serum albumin (BSA) as ...

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Abstract

The invention provides a method for preparing a hydrophilic modified polyvinylidene fluoride membrane. The method comprises steps as follows: (1), preparation of a polyvinylidene fluoride membrane containing an initiating agent; (2), preparation of a KH570 grafted polyvinylidene fluoride membrane; (3), preparation of the hydrophilic modified polyvinylidene fluoride membrane. The hydrophilic modified polyvinylidene fluoride membrane prepared by the method has the advantages of good hydrophilicity, good self-cleaning performance, good stability, simple process, easiness in operation, cheap equipment and easiness in popularization.

Description

technical field [0001] The invention belongs to the field of polymer modification, and in particular relates to a method for preparing a hydrophilic modified polyvinylidene fluoride membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) mainly refers to a homopolymer of vinylidene fluoride or a copolymer of vinylidene fluoride and a small amount of other fluorine-containing vinyl monomers. It has the characteristics of both fluororesins and general-purpose resins. In addition to chemical corrosion resistance, high temperature resistance, oxidation resistance, weather resistance, and radiation resistance, it also has special properties such as piezoelectricity, dielectricity, and pyroelectricity. It is a large product that ranks second in output among fluorine-containing plastics. , the global annual production capacity exceeds 53,000 tons. [0003] The chemical structure is combined with fluorine-carbon bonds. This short-bond structure forms the most stable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00
Inventor 张永明周青袁望章许思李虹陈晓红
Owner 上海氢尚新能源科技有限公司
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