A preparation method of antifouling self-cleaning polyvinylidene fluoride film and its products

A polyvinylidene fluoride film and self-cleaning technology is applied in the field of preparation of anti-fouling and self-cleaning polyvinylidene fluoride film, which can solve the problems of easy agglomeration of nanoparticles and reduced light transmittance of PVDF film, and achieves improved grafting performance, Good super-hydrophobicity, anti-fouling and self-cleaning properties, and the effect of simple process methods

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

AI Technical Summary

Problems solved by technology

However, this method has problems such as easy aggregation of nanoparticles and lower light transmission performance of PVDF film.

Method used

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  • A preparation method of antifouling self-cleaning polyvinylidene fluoride film and its products
  • A preparation method of antifouling self-cleaning polyvinylidene fluoride film and its products
  • A preparation method of antifouling self-cleaning polyvinylidene fluoride film and its products

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Experimental program
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preparation example Construction

[0023] The antifouling self-cleaning (or superhydrophobic) PVDF film preparation method (abbreviation preparation method) of the present invention comprises following process:

[0024] 1. Preparation of PVDF film: Dissolve PVDF powder in a solvent, prepare a PVDF solution with a mass fraction of 5-10%, stir at a constant temperature of 50-70°C for 1-2h, let stand for defoaming for 30min, and coat the film at 90 drying at -180°C to obtain a PVDF membrane; the solvent is acetone, dimethylformamide or dimethylacetamide;

[0025] 2. Alkali treatment of PVDF membrane: Alkaline treatment of PVDF membrane includes two processes: alkali-water solution treatment and alkali-alcohol solution treatment:

[0026] The alkali-water solution treatment process is: immerse the PVDF membrane in an alkali-water solution with a mass concentration of 20-40%, treat it at 60-80°C for 2-3 hours, then take it out, wash it, and dry it, that is, directly introduce hydroxyl groups on the surface of the PV...

Embodiment 1

[0034] 1. Preparation of PVDF film: Dissolve PVDF powder in dimethylformamide solution, prepare a PVDF solution with a mass fraction of 5%, stir at a constant temperature of 60°C for 2h, let it stand for defoaming for 30min, coat the film, and dry it at 90°C. A PVDF membrane with a micron structure is produced.

[0035] 2. Alkaline treatment of PVDF membrane: immerse the PVDF membrane in NaOH-water solution with a mass concentration of 35%, treat it at 60°C for 3 hours, then take out the PVDF membrane, wash it with water, and dry it.

[0036] 3. PVDF membrane surface modification: prepare a toluene solution containing 8% methyltrichlorosilane and 12% dimethyldichlorosilane by volume, put it in an airtight container with a relative humidity of 80% for use, and then put the second Step 2: Immerse the PVDF membrane treated with NaOH solution in the toluene solution in the airtight container, carry out surface treatment for 30min, take out the PVDF membrane after treatment, and us...

Embodiment 2

[0039] 1. Preparation of PVDF membrane: Dissolve PVDF powder in dimethylacetamide solution, prepare a PVDF solution with a mass fraction of 5%, stir at a constant temperature of 70°C for 1.5h, stand for defoaming for 30min, coat the film, and dry at 120°C , to produce a PVDF membrane with a micron structure.

[0040] 2. Alkaline treatment of PVDF membrane: immerse the PVDF membrane in KOH-ethanol solution with a mass concentration of 5%, and treat it at 40°C for 3 minutes, then take out the PVDF membrane, wash it with water, and dry it; then immerse the PVDF membrane in a mass concentration of 4% KMnO 4 / 30% KOH-water solution, react at room temperature for 10 minutes, take out, wash with water, and dry.

[0041] 3. PVDF membrane surface modification: prepare a toluene solution containing 7.4% methyltrichlorosilane and 12.6% dimethyldichlorosilane by volume fraction, put it in an airtight container with a relative humidity of 80% for use, and then put the first Step 2: Immers...

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Abstract

The invention relates to a preparation method of an antifouling self-cleaning polyvinylidene fluoride film and a product thereof. The preparation method includes the following processes: (1). Preparation of PVDF membrane; (2). Lye treatment of PVDF membrane: including two processes of alkali-water solution treatment and alkali-alcohol solution treatment: the alkali-water solution treatment process is: PVDF The membrane is immersed in an alkali-water solution with a mass concentration of 20-40%, treated at 60-80°C for 2-3 hours, taken out, washed with water, and dried; the alkali-alcohol solution treatment process is as follows: firstly soak the PVDF membrane in In an alkali-alcohol solution with a mass concentration of 2-10%, treat it at 25-40°C for 3-5min, take out the membrane, wash it with water, and dry it; then soak the PVDF membrane in an appropriate solution and react at 25-60°C for 3- 10min, then take it out, fully wash with water, and dry it; (3). Use organic silane to modify the surface of PVDF membrane to obtain an antifouling and self-cleaning polyvinylidene fluoride membrane. The antifouling self-cleaning PVDF membrane product is prepared by the preparation method described in the invention.

Description

technical field [0001] The invention relates to a preparation technology of an organic film, in particular to a preparation method of an antifouling self-cleaning polyvinylidene fluoride (PVDF) film and a product thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is a high molecular weight semi-crystalline organic fluoropolymer that, under certain circumstances, can form microspheres. The PVDF molecular structure only has C-F bonds and C-H bonds in the opposite direction, so PVDF membranes have high chemical inertness and excellent weather resistance, such as resistance to degradation caused by ultraviolet rays and damage to chemical substances in the atmosphere, as well as resistance to algae Bacterial and fungal attack. Due to the small polarizability of C-F bond and short bond distance of fluorine-containing materials, the cohesion of PVDF molecules is small and the surface free energy is low, so it is difficult for various liquids to adhere to its sur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12C08J7/16C08J5/18C08L27/16
Inventor 郑振荣霍瑞亭杨文芳牛家嵘田俊莹顾振亚
Owner TIANJIN POLYTECHNIC UNIV
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