Super-hydrophobic polystyrene film and preparation method thereof

A technology of polystyrene film and polystyrene microspheres is applied in the field of preparing superhydrophobic polystyrene film, which can solve the problems of expensive materials and difficult industrialization, and achieve stable superhydrophobicity, good reproducibility, and good industrialization. The effect of the application foreground

Inactive Publication Date: 2008-04-09
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing methods either use expensive materials, or require special processing equipment or complex processes, making it difficult to industrialize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, the glass sheet was pretreated by immersing in a solution of concentrated sulfuric acid and 30wt% hydrogen peroxide at a volume ratio of 7:3 for 1 hour, then taken out, rinsed with a large amount of deionized water, and dried with nitrogen to obtain a pretreated clean glass sheet. Then weigh a certain amount of polystyrene particles and dissolve them in chloroform to form a concentration of 10g L -1 The polystyrene solution was stirred at room temperature for 30 minutes, then added to 60% absolute ethanol of the volume of the polystyrene solution and stirred for 5 minutes, and then the polystyrene solution was spread on the treated glass by casting method On the sheet, after 10 hours of natural drying in the air at room temperature, a layer of white polystyrene film is formed on the glass surface. The wettability of the surface of the film was tested with an OCA20 contact angle tester, and the result showed that the contact angle between the surface and water was...

Embodiment 2

[0024] First, the glass sheet was pretreated for 1 h in a solution of concentrated sulfuric acid and 30 wt% hydrogen peroxide at a volume ratio of 7:3, then taken out, rinsed with a large amount of deionized water, and dried with nitrogen to obtain a pretreated clean glass sheet. Then weigh a certain amount of polystyrene particles and dissolve them in xylene to form a concentration of 50g L -1 in the polystyrene solution and stirred at room temperature for 30 minutes, then added 20% absolute ethanol which is the volume of the polystyrene solution and stirred for 5 minutes, and then spread the polystyrene solution on the treated glass by casting method On the sheet, after 8 hours of natural drying in the air at room temperature, a layer of white polystyrene film was formed on the glass surface. The obtained polystyrene film surface has a contact angle with water of 157±2°, and the film is composed of polystyrene microspheres with a diameter of 1-5 μm.

Embodiment 3

[0026] First, the glass sheet was pretreated by immersing in a solution of concentrated sulfuric acid and 30wt% hydrogen peroxide at a volume ratio of 7:3 for 1 hour, then taken out, rinsed with a large amount of deionized water, and dried with nitrogen to obtain a pretreated clean glass sheet. Then weigh a certain amount of polystyrene particles and dissolve them in chloroform to form a concentration of 40g L -1 polystyrene solution and stirred at room temperature for 30 minutes, then added 95% ethanol which is 50% of the volume of the polystyrene solution and stirred for 10 minutes, then the polystyrene solution was spread on the treated glass by casting method On the sheet, after 10 hours of natural drying in the air at room temperature, a layer of white polystyrene film is formed on the glass surface. The contact angle between the obtained polystyrene film surface and water is 160±2°, and the film is composed of polystyrene microspheres with a diameter of 1-4 μm.

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Abstract

The present invention discloses a super-hydrophobic polystyrene thin film, which is a loose, porous and white thin film, the thin film consists of polystyrene microspheres with the diameter of 1 to 4 Mum, the diameter of a pore is 10 nm to 10 Mum; a contact angle between the thin film and the water is between 150 degrees and 165 degrees, and a rolling angle of the drops on the surface of the thin film is less than 10 degrees. The preparation steps include that: (1) a certain amount of polystyrene particles are weighed and dissolved in the solvent, so as to form the polystyrene solution with the concentration of 1 to 50gL minus 1; (2) 20 percent to 60 percent of the volume of the solution of the ethanol is added in the polystyrene solution and is stirred rapidly; (3) the polystyrene solution which is added with the ethanol is spread on a foundation base by using a flow casting method, and the super-hydrophobic polystyrene thin film is prepared by drying naturally for 8 to 12 hours at the room temperature and the atmospheric environment. The thin film is tasteless and non-toxic, which has very broad application prospect in the liquid non-loss transportation, self-cleaning, water-proofing, and moisture-proofing and other fields. The preparation method has simple operational process, good controllability, low cost, no need of complicated chemical treatments, no need of the expensive equipments and easy industrialization.

Description

technical field [0001] The invention relates to a super-hydrophobic polystyrene film, and also relates to a method for preparing the super-hydrophobic polystyrene film in an atmospheric environment at room temperature. Background technique [0002] Inspired by the lotus leaf effect, solid materials with superhydrophobic surfaces (the contact angle between the surface of the material and water is greater than 150°, and the water droplets have a small rolling angle on the surface) have attracted extensive interest. Due to the characteristics of waterproof, anti-fog, anti-oxidation and self-cleaning, superhydrophobic surfaces have broad application prospects in scientific research, industrial and agricultural production, and daily life. For example, it can be applied to building materials and exterior wall coatings with self-cleaning function, textiles with self-cleaning function, loss-free transportation of liquids, moisture-proof packaging materials, biomedical materials that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L25/06
Inventor 陈洪彭万喜邓和平
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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