Highly durable superhydrophobic, oleophobic and anti-icing coatings and methods and compositions for their preparation
First Claim
Patent Images
1. A hydrophobic coating on a substrate prepared by a method comprising:
- a) applying to said substrate a coating composition, comprising i) a binder, ii) first particles having a size of about 30 microns to about 225 microns, and iii) a solvent, to provide a base coating; and
b)applying to said base coating a composition comprising second particles having a size of about 1 nanometer to 25 microns, wherein, prior to the application of the second particles to the base coating,i) the second particles have been modified with hexamethyldisilazane,ii) the second particles comprise covalently bound polydimethylsiloxane, oriii) the second particles comprise one or more covalently bound moieties independently selected from the group consisting of alkyl, haloalkyl and perfluoroalkyl moieties, which one or more moieties are covalently bound to said second particles by reaction of the particles with a silanizing agent of formula (I), said compound of formula (I) having the structure;
R4-nSi—
Xn
(I)where n is an integer from 1 to 3;
each R is independently selected from(i) C1 to 20 alkyl optionally substituted with one or more fluorine atoms;
or(ii) —
Z—
((CF2)q(CF3))r, wherein Z is a C1-12 divalent alkane radical or a C2-12 divalent alkene or alkyne radical, q is an integer from 1 to 12, and r is an integer from 1-4;
each X is independently selected from the group consisting of —
H, —
Cl, —
I, —
Br, —
OH, —
OR2, —
NHR3, and —
N(R3)2;
each R2 is an independently selected C1 to 4 alkyl or haloalkyl group; and
each R3 is an independently selected H, C1 to 4 alkyl or haloalkyl group;
wherein said coating has a contact angle with water that is greater than about 120°
at a temperature of 18°
C. to 23°
C.;
wherein the coating has a surface in contact with the substrate and an exposed surface comprising the binder that is not in contact with the substrate, the exposed surface having an arithmetical mean roughness from about 0.2 microns to about 20 microns, or a ten point mean roughness from about 1 micron to about 90 microns;
wherein, in the resulting coating, the first particles are primarily distributed within and coated with the binder and the second particles are primarily distributed on the exposed surface;
andwherein the coating has a greater number of second particles on the exposed surface than on the surface in contact with the substrate.
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Abstract
Highly durable hydrophobic, oleophobic, and anti-icing coatings and methods of their preparation and use are described herein.
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Citations
32 Claims
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1. A hydrophobic coating on a substrate prepared by a method comprising:
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a) applying to said substrate a coating composition, comprising i) a binder, ii) first particles having a size of about 30 microns to about 225 microns, and iii) a solvent, to provide a base coating; and b) applying to said base coating a composition comprising second particles having a size of about 1 nanometer to 25 microns, wherein, prior to the application of the second particles to the base coating, i) the second particles have been modified with hexamethyldisilazane, ii) the second particles comprise covalently bound polydimethylsiloxane, or iii) the second particles comprise one or more covalently bound moieties independently selected from the group consisting of alkyl, haloalkyl and perfluoroalkyl moieties, which one or more moieties are covalently bound to said second particles by reaction of the particles with a silanizing agent of formula (I), said compound of formula (I) having the structure;
R4-nSi—
Xn
(I)where n is an integer from 1 to 3; each R is independently selected from (i) C1 to 20 alkyl optionally substituted with one or more fluorine atoms;
or(ii) —
Z—
((CF2)q(CF3))r, wherein Z is a C1-12 divalent alkane radical or a C2-12 divalent alkene or alkyne radical, q is an integer from 1 to 12, and r is an integer from 1-4;each X is independently selected from the group consisting of —
H, —
Cl, —
I, —
Br, —
OH, —
OR2, —
NHR3, and —
N(R3)2;each R2 is an independently selected C1 to 4 alkyl or haloalkyl group; and each R3 is an independently selected H, C1 to 4 alkyl or haloalkyl group; wherein said coating has a contact angle with water that is greater than about 120°
at a temperature of 18°
C. to 23°
C.;wherein the coating has a surface in contact with the substrate and an exposed surface comprising the binder that is not in contact with the substrate, the exposed surface having an arithmetical mean roughness from about 0.2 microns to about 20 microns, or a ten point mean roughness from about 1 micron to about 90 microns; wherein, in the resulting coating, the first particles are primarily distributed within and coated with the binder and the second particles are primarily distributed on the exposed surface; and wherein the coating has a greater number of second particles on the exposed surface than on the surface in contact with the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 26, 27, 31, 32)
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10. A system for applying a hydrophobic coating on a substrate, the system comprising as separate components component (a) and component (b);
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wherein component (a) for application of a base coating comprises i) a binder, ii) a solvent, and iii) first particles having a size of about 30 microns to about 225 microns, and wherein said component (b) comprises second particles having a size of about 1 nanometer to 25 microns, where, prior to the application of the second particles to the base coating, i) the second particles have been modified with hexamethyldisilazane, ii) the second particles comprise covalently bound polydimethylsiloxane, or iii) the second particles comprise one or more covalently bound moieties independently selected from the group consisting of alkyl, haloalkyl, and perfluoroalkyl moieties, which one or more moieties are covalently bound to said second particles by reaction of the particles with a silanizing agent of formula (I), said compound of formula (I) having the structure;
R4-nSi—
Xn
(I)where n is an integer from 1 to 3; each R is independently selected from (i) C1 to 20 alkyl optionally substituted with one or more fluorine atoms;
or(ii) —
Z—
((CF2)q(CF3))r, wherein Z is a C1-12 divalent alkane radical or a C2-12 divalent alkene or alkyne radical, q is an integer from 1 to 12, and r is an integer from 1-4;each X is independently selected from the group consisting of —
H, —
Cl, —
I, —
Br, —
OH, —
OR2, —
NHR3, and —
N(R3)2;each R2 is an independently selected C1 to 4 alkyl or haloalkyl group; and each R3 is an independently selected H, C1 to 4 alkyl or haloalkyl group; wherein the composition of component (a) and component (b) are such that application of component (a) to the substrate to form a base coat comprised of the binder and first particles followed by application of component (b) to said base coat produces the hydrophobic coating on said substrate, the hydrophobic coating having a surface in contact with the substrate and an exposed surface comprising the binder; wherein, in the resulting hydrophobic coating, the first particles are primarily distributed within and coated with the binder, and the second particles are primarily distributed on the exposed surface; and wherein the hydrophobic coating has an arithmetical mean roughness from about 0.2 microns to about 20 microns or a ten point mean roughness from about 1 micron to about 90 microns. - View Dependent Claims (11, 12, 13)
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14. A dried and cured hydrophobic coating applied to a substrate, wherein the coating has a surface in contact with said substrate and an exposed surface comprising binder that is not in contact with the substrate, the coating comprising:
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i) a binder;
ii) first particles having a size of about 30 microns to about 225 microns; andiii) second particles having a size of about 1 nanometer to 25 microns that have been modified with hexamethyldisilazane, comprise covalently bound polydimethylsiloxane, or comprise one or more covalently bound moieties independently selected from the group consisting of alkyl, haloalkyl and perfluoroalkyl; wherein the coating optionally contains 5% to 10% of a block copolymer on a weight basis, the exposed surface having an arithmetical mean roughness from about 0.2 microns to about 20 microns or a ten point mean roughness from about 1 micron to about 90 microns; wherein said coating has a contact angle with water that is greater than about 120°
at a temperature of 18°
C. to 23°
C.;wherein, in the hydrophobic coating, the first particles are primarily distributed within and coated with the binder, and the second particles are primarily distributed on the exposed surface; and wherein the coating has a greater number of second particles on the exposed surface than on the surface in contact with the substrate. - View Dependent Claims (15, 16, 17, 18, 19, 20, 28)
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21. A hydrophobic coating on a substrate prepared by a method comprising:
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a) applying to said substrate a coating composition comprising i) a binder, ii) a solvent, and iii) first particles having a size of about 30 micron to about 225 microns, to provide a base coating; and b) applying to said base coating a composition comprising a solvent and second particles comprised of silica or alumina having a size of about 1 nanometer to 25 microns, wherein prior to the application of said second particles to said base coating i) the second particles have been modified with hexamethyldisilazane, ii) the second particles comprise covalently bound polydimethylsiloxane, or iii) the second particles comprise one or more covalently bound moieties independently selected from the group consisting of alkyl, haloalkyl and perfluoroalkyl moieties, which one or more moieties are covalently bound to said second particles by reaction of the particles with a silanizing agent of formula (I), said compound of formula (I) having the structure;
R4-nSi—
Xn
(I)where n is an integer from 1 to 3; each R is an independently selected C1 to 20 alkyl optionally substituted with one or more fluorine atoms, or each R is a —
Z—
((CF2)q(CF3))r group, wherein Z is a C1-12 divalent alkane, q is an integer from 1 to 12, and r is an integer from 1-4;each X is independently selected from the group consisting of —
H, —
Cl, —
I, —
Br, —
OH, —
OR2, —
NHR3, and —
N(R3)2;each R2 is an independently selected C1 to 4 alkyl or haloalkyl group; and each R3 is an independently selected H, C1 to 4 alkyl or haloalkyl group; wherein the coating has a surface in contact with the substrate and an exposed surface comprising the binder that is not in contact with the substrate, the exposed surface having an arithmetical mean roughness from about 0.2 microns to about 20 microns, or a ten point mean roughness from about 1 micron to about 90 microns; wherein said coating has a contact angle with water that is greater than about 120°
at a temperature of 18°
C. to 23°
C.;wherein, in the resulting hydrophobic coating, the first particles are primarily distributed within and coated with the binder, and the second particles are primarily distributed on the exposed surface; and wherein the coating has a greater number of second particles on the exposed surface than on the surface in contact with the substrate. - View Dependent Claims (22, 23, 24, 25, 29)
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30. A system for applying a hydrophobic coating on a substrate, the system comprising as separate components component (a) and component (b);
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wherein component (a) for application of a base coating comprises i) a binder, ii) a solvent, and iii) first particles having a size of about 30 microns to about 225 microns, wherein said component (a) optionally comprises one or more solvents; and wherein component (b) comprises silica or alumina second particles having a size of about 1 nanometer to 25 microns, where, prior to the application of the second particles to the base coating, i) the second particles have been modified with hexamethyldisilazane, ii) the second particles comprise covalently bound polydimethylsiloxane, or iii) the second particles comprise one or more covalently bound moieties independently selected from the group consisting of alkyl, haloalkyl and perfluoroalkyl moieties, are covalently bound to said second particles by reaction of the particles with a silanizing agent of formula (I), said compound of formula (I) having the structure;
R4-nSi—
Xn
(I)where n is an integer from 1 to 3; each R is independently selected from (i) C1 to 20 alkyl optionally substituted with one or more fluorine atoms; and (ii) —
Z—
((CF2)q(CF3))r, wherein Z is a C1-12 divalent alkane radical or a C2-12 divalent alkene or alkyne radical, q is an integer from 1 to 12, and r is an integer from 1-4;each X is independently selected from the group consisting of —
Cl, —
OR2, —
NHR3, and —
N(R3)2;each R2 is an independently selected C1 to 4 alkyl or haloalkyl group; and each R3 is an independently selected H, C1 to 4 alkyl or haloalkyl group; wherein the composition of component (a) and component (b) are such that application of component (a) to the substrate to form a base coat comprised of the binder and first particles followed by application of component (b) to said base coat produces the hydrophobic coating on said substrate, the hydrophobic coating having a surface in contact with the substrate and an exposed surface comprising the binder; wherein, in the resulting hydrophobic coating, the first particles are primarily distributed within and coated with the binder, and the second particles are primarily distributed on the exposed surface; and wherein the hydrophobic coating has an arithmetical mean roughness from about 0.2 microns to about 20 microns or a ten point mean roughness from about 1 micron to about 90 microns and a contact angle with water that is greater than about 160°
at a temperature of 18°
C. to 23°
C.
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Specification