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

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Problems solved by technology

However, this method has problems such as easy aggregation of nan

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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Example Embodiment

[0019] The preparation method (preparation method for short) of the super-hydrophobic PVDF membrane designed in the present invention includes the following processes:

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

[0021] 2. Plasma treatment of PVDF film: the surface of the PVDF film obtained by plasma treatment of a specific atmosphere under the condition of a vacuum of 8-11 Pa for 5-15 minutes, and a processing power of 100-200W to generate active groups on the surface of the film; The atmosphere is nitrogen, oxygen, air, argon or helium. The plasma...

Example Embodiment

[0026] Example 1

[0027] 1. Preparation of PVDF membrane: Dissolve PVDF powder in DMF solution, prepare a PVDF solution with a mass fraction of 5%, stir at a constant temperature of 60°C for 2 hours, let stand for 30 minutes, and coat and dry at 120°C. PVDF membrane with micron structure.

[0028] 2. Plasma treatment of PVDF membrane: Treat the surface of PVDF membrane with oxygen microwave plasma for 5 minutes under the condition of vacuum degree of 10 Pa, and the treatment power is 200W to generate active groups on the membrane surface.

[0029] 3. Chemical bath deposition method to modify the plasma-treated PVDF film: first dissolve methyltrichlorosilane in a toluene solvent to make a methyltrichlorosilane solution with a volume concentration of 1 / 10, and place it in the relative humidity In a 60% airtight container, set aside, then immerse the plasma-treated PVDF membrane in the methyltrichlorosilane solution in the airtight container, perform surface treatment for 10 minutes...

Example Embodiment

[0031] Example 2

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

[0033] 2. Plasma treatment of PVDF film: Treat the surface of PVDF film with oxygen glow plasma for 12 minutes under the condition of vacuum degree of 10 Pa, and the treatment power is 200W, so that active groups are generated on the surface of the film.

[0034] 3. Use chemical vapor deposition to modify the plasma-treated PVDF film: first dissolve methyltrichlorosilane in a toluene solvent to prepare a solution of methyltrichlorosilane with a volume concentration of 1 / 10, and place it on the opposite side. In a closed container with a humidity of 30%, set aside; put the PVDF film treated with oxygen plasma on top of the methyltrichlorosilane solution in the closed container, react for 1 hour in the...

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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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