Highly fluorinated nanostructured polymer foams for producing super-repellent surfaces

Inactive Publication Date: 2019-09-26
GLASSOMER GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a highly fluorinated nanostructured polymer foam that can create super-repellent surfaces that have the characteristic of being waterproof and anti-corrosive. This characteristic should not be limited to the surface, but should be maintained throughout the foam's entire surface thickness. This solution is provided by the various embodiments of the invention described in the claims.

Problems solved by technology

If the air is driven away from the surface, Young's equation is no longer valid, and the super-repellent effect of the surface is lost despite its low level of free surface energy.
These approaches are particularly disadvantageous due to the fact that the replication usually only reaches a very low penetration depth, and thus a low effect depth.
Furthermore, in the case of these approaches, thermoplastic fluoropolymers are used since the required mechanical restructuring can only take place if the polymer network is not chemically cross-linked.
These approaches are disadvantageous due to the roughness of the created surface frequently also having a limited effect depth.
Thicker coatings frequently become mechanically instable.
In particular, in the case of “bottom-up approaches”, the second method step represents the limiting factor.
Thus, vapor-phase processes only allow for a certain insertion and removal of reagents, for example, into a nanostructure or out of a nanostructure.
In the case of “bottom-up approaches”, the same problem accordingly arises as in the case of “top-down approaches”: The limited effect depth does not allow for surfaces to be produced that are sufficiently mechanically stable for practical applications.
Due to the fact that nanoscale structures, particularly if they are composed of adsorbing or self-assembled particles, comprise a very low level of mechanical stability, the coatings obtained by the “bottom-up approaches” are mostly still less robust than the structures produced by means of “top-down approaches”.
If the super-repellent surface is exposed to mechanical burdens such as abrasion, for example, due to weather impact, a material erosion gradually occurs in the magnitude of the effect depth, wherein the super-repellent characteristic of the surface is ultimately lost completely.

Method used

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  • Highly fluorinated nanostructured polymer foams for producing super-repellent surfaces
  • Highly fluorinated nanostructured polymer foams for producing super-repellent surfaces
  • Highly fluorinated nanostructured polymer foams for producing super-repellent surfaces

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0091]0.214 mmol of a commercially available diacrylate derivative (Fluorolink MD 700) were mixed with 0.243 mmol 1H,1H,2H,2H perfluorooctanol, 0.449 mmol cyclohexanol and 0.006 mmol 2,2-dimethoxy-2-phenylacetophenone. The composition was cured under UV light (370 nm) for a duration of 2 min. The polymer foam obtained in this manner was dipped in isopropanol for 16 hours and then dried in an oven for 80° C. for one hour.

[0092]The polymer foam was super-hydrophobic, transparent with a slight turbidity and had a contact angle of 138° for dimethyl sulfoxide. Furthermore, the polymer foam between 400 and 800 nm had an optical transmission of 58.2% to 91.9% at a thickness of 0.25 mm.

[0093]As a reference, the non-porous form of the polymer foam had a free surface energy of 17.4 mN / m at a density of 1.692 g / mL (+ / −0.112 g / mL, three measurements). In contrast, the porous form of the polymer foam had a free surface energy of 2.939 mN / m at a density of 1.660 g / mL (+ / −0.030 g / mL, three measure...

example 2

[0095]A monomer mixture, consisting of 1.520 mmol of 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctylmethacrylate and 0.787 mmol of 2,2,3,3,4,4,5,5-octafluorohexyldimethacrylate was mixed with 1.299 mmol of cyclohexanol, 2.049 mmol of 1H,1H,2H,2H-perfluorooctanol, 0.086 mmol of 2,2-dimethoxy-2-phenylacetophenone and 0.681 mmol of acetone. The composition was cured under UV light (220 to 400 nm) for a duration of 5 min. The polymer foam obtained in this manner was dipped in isopropanol for one hour and then dried in an oven at 80° C. for one hour.

[0096]The polymer foam was super-hydrophobic, optically clear and had a contact angle of 102° for dimethyl sulfoxide. Furthermore, the polymer foam between 400 and 800 nm had an optical transmission of 79.9% to 91.4% at a thickness of 0.25 mm.

[0097]As a reference, the non-porous form of the polymer foam had a free surface energy of 17.47 mN / m at a density of 1.654 g / mL (+ / −0.058 g / mL, three measurements). In contrast, the porous form of th...

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Abstract

The present invention relates to a highly fluorinated nanostructured polymer foam as well as to its use as a super-repellent coating of substrates. Furthermore, the present invention relates to a composition and to a method for producing the highly fluorinated nanostructured polymer foam.

Description

CROSS-REFERENCE[0001]This application is a section 371 U.S. National phase of PCT / EP2017 / 001171, filed Oct. 4, 2017 which claims priority from German patent application no. 10 2016 012 001.0, filed Oct. 6, 2016, both which are incorporated by reference in its entirety.FIELD OF INVENTION[0002]The present invention relates to a highly fluorinated nanostructured polymer foam as well as to its use as a super-repellent coating of substrates. Furthermore, the present invention relates to a composition and to a method for producing the highly fluorinated nanostructured polymer foam.BACKGROUND OF THE INVENTION[0003]Super-repellent surfaces are surfaces, from which both water as well as oils and organic solvents pearl off. Accordingly, they are both hydrophobic as well oleophobic. Applications include super-repellent surfaces, among other things, in the form of technical surface coatings, glass coatings, and fabric coatings and are used in the outdoor industry, automotive industry and pharma...

Claims

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Application Information

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IPC IPC(8): C09D5/00C09D135/02C09D133/16C08J9/28
CPCC08J2335/02C08J2205/044C09D5/00C08J2333/16C09D133/16C09D135/02C08J2201/0502C08J9/286C08L33/16C08J2201/026C08J2205/042C08J2205/052C08J2300/102C08J9/28C08J2201/0543C08J9/12C08F220/22
Inventor RAPP, BASTIANHELMER, DOROTHEARICHTER, CHRISTIANEKELLER, NICO
Owner GLASSOMER GMBH
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