Method for preparing pollution preventing self-cleaning polyvinylidene fluoride (PVDF) film and product thereof

A polyvinylidene fluoride film and self-cleaning technology, which is applied in the field of preparation of antifouling self-cleaning polyvinylidene fluoride film, can solve the problems of low light transmission performance of PVDF film, easy aggregation of nanoparticles, etc., and achieve good super hydrophobicity and anti-corrosion Pollution self-cleaning performance, improvement of grafting performance, and simple process

Inactive Publication Date: 2010-02-17
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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  • Method for preparing pollution preventing self-cleaning polyvinylidene fluoride (PVDF) film and product thereof
  • Method for preparing pollution preventing self-cleaning polyvinylidene fluoride (PVDF) film and product thereof
  • Method for preparing pollution preventing self-cleaning polyvinylidene fluoride (PVDF) film and product thereof

Examples

Experimental program
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preparation example Construction

[0023] The anti-fouling self-cleaning (or super-hydrophobic) PVDF membrane preparation method (referred to as preparation method) designed by the present invention includes the following processes:

[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, stand for defoaming for 30min, and coat the film at 90°C. The PVDF membrane is obtained by drying at -180°C; the solvent is acetone, dimethylformamide or dimethylacetamide;

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

[0026] The alkali-aqueous solution treatment process is as follows: the PVDF membrane is immersed in an alkali-aqueous solution with a mass concentration of 20-40%, treated at 60-80 ° C for 2-3 hours, then taken out for washing and drying, that is, the hyd...

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 method for preparing a pollution preventing self-cleaning polyvinylidene fluoride (PVDF) film and a product thereof. The method comprises the following processes: (1) PVDF film preparation; and (2) PVDF film processing with alkali liquor, including an alkali-water solution processing process and an alkali-alcohol solution processing process, wherein the alkali-water solution processing process comprises the following steps: soaking the PVDF film in alkali-water solution with the mass concentration of 20-40 percent; processing at 60-80 DEG C for 2-3 hours and then taking out to wash with water; drying and obtaining the PVDF film; the alkali-alcohol solution processing process comprises the following steps: soaking the PVDF film in alkali-alcohol solution with themass concentration of 2-10 percent; processing at 25-40 DEG C for 3-5 minutes and then taking the film out; washing with water and drying; soaking the PVDF film in proper solution to react at 25-60 DEG C for 3-10 minutes; then taking out and fully washing with water; drying and then obtaining the PVDF film; (3) decorating the surface of the PVDF film by organosilane and preparing the pollution preventing self-cleaning polyvinylidene fluoride film. The pollution preventing self-cleaning PVDF film product is prepared by the method.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(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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