Method for preparing ultra-oleophobic surface underwater

An underwater super-oleophobic and oleophobic technology is applied in the field of surface modification of solid materials, which can solve the problems of high consumption cost and complex process, and achieve the effects of no environmental pollution, simple equipment and low cost.

Inactive Publication Date: 2010-05-12
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation method of this material has the ...

Method used

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  • Method for preparing ultra-oleophobic surface underwater
  • Method for preparing ultra-oleophobic surface underwater
  • Method for preparing ultra-oleophobic surface underwater

Examples

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Embodiment 1

[0023] Adding chitosan with a molecular weight of 300kg / mol and a degree of deacetylation of 90% to 2v% acetic acid aqueous solution and stirring to obtain a 2wt% chitosan acetic acid solution, the solution is cast on a clean glass sheet and dried to obtain a smooth film . The surface of the film is smooth without rough structure, the contact angle of the surface with water in air is 15°, and the contact angle with chloroform under water is 125°.

[0024] Its surface morphology is shown in the appendix figure 1 .

Embodiment 2

[0026] Molecular weight is 300kg / mol, the chitosan that deacetylation degree is 70% is added in the acetic acid aqueous solution of 2v% and stirs and obtains the chitosan acetic acid solution of 2wt%, this solution casts a film on the clean glass sheet, afterwards in 2mol / Soak in L of sodium hydroxide solution for 2 minutes, wash with water three times, and dry at room temperature to obtain a rough surface. The size of the surface rough structure is 0.01-0.1 micron, the contact angle of the surface with water in air is 10°, and the contact angle with dichloroethane under water is 158°.

[0027] Its surface morphology is shown in the appendix figure 2 .

Embodiment 3

[0029] The molecular weight is 200kg / mol, the chitosan that the degree of deacetylation is 95% is added in the acetic acid aqueous solution of 1v% and stirs to obtain the chitosan acetic acid solution of 3wt%, this solution casts a film on the clean glass sheet, with 1mol / L soak in sodium hydroxide solution for 5 minutes, then wash with water three times, and dry at room temperature to obtain a rough surface. The contact angle with chloroform is 150°.

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Abstract

The invention belongs to the field of surface modification of solid materials and particularly relates to a method for preparing an ultra-oleophobic surface underwater. In the method, the self-assembly technology and out-phase nucleary technology are adopted, acetic acid solution of chitosan and sodium hydroxide solution of nano-silica are used as raw materials, a surface of micro-nano composite coarse structure is prepared by a one-step method at room temperature, and a contact angle of a surface of an underwater material and oil is changed by utilizing the change of a microcosmic structure of the surface so as to change the wetting quality of the material surface. The method has simple equipment, low cost and no environmental pollution, and prepares the micro-nano composite coarse structure quickly by the one-step method at the room temperature in a large area so as to reach the underwater ultra-lipophobicity of the material surface.

Description

technical field [0001] The invention belongs to the field of surface modification of solid materials, in particular to a method for preparing an underwater super-oleophobic surface material by using self-assembly technology and heterogeneous nucleation technology. Background technique [0002] Wetting is a common interface phenomenon, which plays an important role in the life of animals and plants, as well as in the production and life of human beings. Wetting is a physical interface phenomenon in which one fluid is displaced from a surface by another fluid, involving the relationship between three phases or multiphase interfaces, at least two of which must be fluid. There are four ways of one gas and two immiscible liquids; one solid and two immiscible liquids; three immiscible liquids and one liquid, one gas and one solid, which may constitute the wetting phenomenon. [0003] With the rapid development of nanotechnology, the research on surface wettability has been develo...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L5/08
Inventor 金美花马玮廖明义
Owner DALIAN MARITIME UNIVERSITY
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