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Preparation of ultra-hydrophobic polyvinylidene fluoride membrane and product thereof

A super-hydrophobic and product technology, applied in the field of preparation of super-hydrophobic polyvinylidene fluoride film, can solve the problems of easy agglomeration of nanoparticles and reduced light transmittance of PVDF film, and achieve low adhesion, good self-cleaning function, good The effect of superhydrophobicity

Inactive Publication Date: 2009-06-24
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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  • Preparation of ultra-hydrophobic polyvinylidene fluoride membrane and product thereof
  • Preparation of ultra-hydrophobic polyvinylidene fluoride membrane and product thereof
  • Preparation of ultra-hydrophobic polyvinylidene fluoride membrane and product thereof

Examples

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preparation example Construction

[0019] The superhydrophobic PVDF membrane preparation method (abbreviation preparation method) of the present invention design comprises following process:

[0020] 1. Preparation of PVDF membrane: PVDF is a high molecular weight semi-crystalline organic fluoropolymer with a crystallinity of 60-80%, and can form microcrystals under certain circumstances. Dissolve PVDF powder in an appropriate solvent such as acetone, DMF or DMAC, and prepare a PVDF solution with a mass fraction of 5-10%, stir at a constant temperature of 60-80°C for 1-2h, let it stand for defoaming for 30-60min, and coat the film. Then dry it at 90-180°C to make a PVDF membrane.

[0021] 2. Plasma treatment of PVDF membrane: Under the condition of vacuum degree of 8-11Pa, the surface of the obtained PVDF membrane is treated with plasma in a specific atmosphere for 5-15min, and the processing power is 100-200W, so that active groups are generated on the surface of the membrane; the specific The atmosphere is n...

Embodiment 1

[0027] 1. Preparation of PVDF film: Dissolve PVDF powder in DMF solution, prepare a PVDF solution with a mass fraction of 5%, stir at 60°C for 2 hours, let it stand for defoaming for 30 minutes, coat the film, and dry it at 120°C to obtain a film with Microstructured PVDF membrane.

[0028] 2. Plasma treatment of PVDF membrane: Under the condition of vacuum degree of 10Pa, the surface of PVDF membrane was treated with oxygen microwave plasma for 5 minutes, and the processing power was 200W, so that active groups were generated on the surface of the membrane.

[0029] 3. Chemical bath deposition method to modify the plasma-treated PVDF membrane: first dissolve methyltrichlorosilane in toluene solvent to make a methyltrichlorosilane solution with a volume concentration of 1 / 10, and place it in a relative humidity 60% airtight container, stand-by, then immerse the PVDF film that has been treated by plasma in the methyltrichlorosilane solution in the airtight container, carry out ...

Embodiment 2

[0032] 1. Preparation of PVDF film: Dissolve PVDF powder in acetone solution, prepare a PVDF solution with a mass fraction of 10%, stir at a constant temperature of 80°C for 1h, let it stand for defoaming for 50min, coat the film, and dry it at 100°C to obtain a film with Microstructured PVDF membrane.

[0033] 2. Plasma treatment of PVDF membrane: Under the condition of vacuum degree of 10Pa, the surface of PVDF membrane was treated with oxygen glow plasma for 12min, and the processing power was 200W to generate active groups on the surface of the membrane.

[0034] 3. Use chemical vapor deposition to modify the plasma-treated PVDF membrane: first dissolve methyltrichlorosilane in toluene solvent to make a solution of methyltrichlorosilane with a volume concentration of 1 / 10, and place it in a relatively Humidity 30% airtight container, stand-by; Put the PVDF film that has been treated with oxygen plasma on the methyltrichlorosilane solution in the airtight container, after r...

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Abstract

The invention relates to a preparation method of a hyperhydrophobic PVDF membrane and a product thereof. The preparation method comprises the following steps: 1. preparation of a PDVF membrane; 2. plasma treatment of the PDVF membrane: performing the plasma treatment on the PDVF membrane in a nitrogen, oxygen, air, argon or helium atmosphere at a power of 100-200W under a vacuum degree of 8-11Pa for 5-15min; and 3. surface modification of the PDVF membrane: preparing an organosilane solution with a volume concentration of 1 / 10-1 / 3, and placing the organosilane solution in a closed vessel with the relative humidity of 30-60% for use; then placing the PDVF membrane subject to the plasma treatment into the closed vessel, and treating the PDVF membrane by a chemical bath deposition method for 8-12min, or treating the PDVF membrane under a vapor condition by a chemical vapor deposition method for 50-120min; then adequately washing the PDVF membrane sequentially with toluene, ethanol and aqueous ethanol solution at an ethanol / water ratio of 1:1 at the normal temperature; drying at the temperature of 100-120 DEG C for 10-15min to obtain the hyperhydrophobic PVDF membrane. The PVDF membrane product is prepared by the preparation method of the hyperhydrophobic PVDF membrane.

Description

technical field [0001] The invention relates to a preparation technology of an organic film, in particular to a preparation method of a superhydrophobic polyvinylidene fluoride (PVDF) film and a product thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is a high-molecular-weight semi-crystalline organic fluoropolymer, which has better weather resistance than other crystalline polymers, such as resistance to degradation caused by ultraviolet rays and damage from chemicals in the atmosphere. Resists attack by algae and fungi. Therefore, PVDF membrane has a wide range of uses, and can be widely used on the surface of architectural membranes, glass, textiles and other substrates to increase the weather resistance of the substrate. However, the hydrophobicity of the PVDF membrane surface is low, and the self-cleaning function is poor. The dust accumulated on the surface of the PVDF membrane during long-term use will affect the cleanliness and light transmissi...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J7/00C08J5/18C08L27/16
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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