A kind of preparation method of super-hydrophobic sheet film

A technology of horizontal plate and flat film, which is applied in the field of preparation of super-hydrophobic horizontal plate film, which can solve the problems of falling off, complicated operation steps and high cost, and achieve the effects of avoiding falling off, excellent chemical resistance and high mechanical strength

Active Publication Date: 2017-11-07
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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Problems solved by technology

Among these methods, chemical etching method, sol-gel method, template method, and electrospinning method are usually difficult to form a super-hydrophobic layer on the surface of polyolefin flat base film, and there are also disadvantages such as cumbersome operation steps, complicated equipment, and high cost. Therefore, it is not suitable for large-scale superhydrophobic membrane preparation.
Although plasma technology, electrochemical deposition method, and simple spraying method can treat the surface of the film, the superhydrophobic coating layer on the surface layer after film formation has no chemical bond cross-linking with the film surface, and the hydrophobic surface is prone to shedding and loss.
Molecular self-assembly is not easy to achieve and will fall off

Method used

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  • A kind of preparation method of super-hydrophobic sheet film

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[0042] A method for preparing a super-hydrophobic horizontal plate film, using a polyolefin flat film as a base film, first carrying out membrane hydroxylation treatment on the polyolefin flat base film, and then using silane monomers to carry out silane treatment on the surface of the polyolefin flat base film silanization reaction, constructing a silicone micro- or nano-structured surface on the polyolefin flat base film, by adjusting the water content of the silanization reaction system, controlling the polymerization direction of the silane monomer on the surface of the polyolefin flat base film, and obtaining a super-hydrophobic flat film .

[0043]Based on the research of super-hydrophobic intelligent infiltration of solid surface, the present invention innovatively proposes silanization reaction on the surface of polyolefin flat film from two aspects of surface chemical composition and surface microstructure, and utilizes silanization reaction on the surface of flat base...

Embodiment 1

[0077] (1) Rectify the toluene dried by molecular sieves, take 100 mL of 110°C fraction and store it dry, and use it as anhydrous toluene. It is the saturated toluene solution of solute, then 0.001g methyltrichlorosilane monomer is dissolved in the saturated toluene solution taking water as solute, and the saturated toluene solution taking water as solute is prepared as solvent, and methyltrichlorosilane monomer is Solute, a silane solution with a concentration of 10mg / L, sealed for subsequent use;

[0078] (2) take the polypropylene flat film as the base film, after washing and drying the polypropylene flat film several times, in the newly prepared Piranha solution (H 2 SO 4 :30%H 2 o 2 =7:3) at 50°C for 1 hour to carry out the hydroxylation reaction, then rinse with a large amount of deionized water, and dry for later use;

[0079] (3) Put the hydroxylated polypropylene flat base film into the silane solution prepared in step (1), seal it for silanization reaction for 5 ...

Embodiment 2

[0084] (1) Carry out rectification of toluene, take 100mL of 110°C distillate, mix it with deionized water, let it stand for 2 days after shaking, take the supernatant to obtain a saturated toluene solution with water as the solute, and then add 1g of n-octyltri Dissolve chlorosilane monomer in saturated toluene solution with water as solute, prepare saturated toluene solution with water as solute as solvent, n-octyltrichlorosilane monomer as solute, and a silane solution with a concentration of 10g / L, and seal it for future use .

[0085](2) Taking the polytetrafluoroethylene film flat plate as the base film, after washing and drying the polytetrafluoroethylene flat plate base film several times, in the newly prepared Piranha solution (H 2 SO 4 :30%H 2 o 2 =7:3) at 80°C for 5 hours to carry out the hydroxylation reaction, then rinsed with a large amount of deionized water, and dried for later use;

[0086] (3) Put the polytetrafluoroethylene plate base film after hydroxyl...

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Abstract

The invention relates to the technical field of film preparation and film surface modification, in particular to a preparation method of a super-hydrophobic plate film. The preparation method of the super-hydrophobic horizontal plate film of the present invention comprises the following steps: (1) hydroxylation of the film, (2) silylation reaction, (3) thermal crosslinking. The preparation method of the super-hydrophobic horizontal plate film of the present invention has the following advantages: the preparation process is simple, easy to operate, and low in cost; the prepared super-hydrophobic film has excellent chemical resistance and high mechanical strength; the surface of the super-hydrophobic film is By adjusting the water content of the reaction system and controlling the polymerization direction of the monomer, a surface with adjustable microstructure can be obtained; and a unified whole can be formed, which can effectively avoid falling off during use. Due to the above excellent properties, the present invention can be well applied in water treatment technologies such as membrane distillation, pervaporation, and membrane absorption, as well as other petrochemical, biological, pharmaceutical, and energy fields that require relatively high hydrophobic membrane processes.

Description

technical field [0001] The invention relates to the technical field of film preparation and film surface modification, in particular to a preparation method of a super-hydrophobic plate film. Background technique [0002] Membrane process, as a new type of separation process, has been used more and more in industry and daily life. Membrane distillation, pervaporation, and membrane absorption are several common membrane separation processes. The common point of these several membrane processes is that one of the substances to be separated (mostly water or volatile organic matter) passes through the membrane wall in the form of gas, and is separated from the liquid raw material solution. In the above membrane process, the stronger the hydrophobicity of the membrane, the more conducive to the passage of gas, which is beneficial to avoid the wetting of the membrane by liquid water and the pollution of the membrane surface by hydrophilic pollutants, and obtain a higher separatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/26B01D69/06B01D67/00
Inventor 魏昕栾金义杨永强杨丽
Owner CHINA PETROLEUM & CHEM CORP
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