Low adhesion sol gel coatings with high thermal stability for easy clean, self cleaning printhead front face applications
View Patent ↗Various embodiments provide oleophobic, low adhesion coatings with high thermal stability and methods of forming and using them in an ink jet printhead, wherein the oleophobic, low adhesion coatings can include a sol-gel cross-linked coating by a self-condensation process of at least a silane-functionalized perfluoropolyether based polymer precursor.
1. A coating for an ink jet printhead front face comprising:
an oleophobic, low adhesion coating, wherein a surface of the oleophobic, low adhesion coating, after a temperature exposure of greater than about 200° C. for more than about 30 minutes, exhibits a sliding angle of less than about 30° with one or more of an ultra-violet (UV) gel ink drop and a solid ink drop,
wherein the low adhesion coating is a sol-gel cross-linked coating.
2. The coating of claim 1 , wherein the sliding angle is less than about 20°.
3. The coating of claim 1 , wherein the surface of the oleophobic, low adhesion coating exhibits a contact angle of about 45° or greater with the one or more of the ultra-violet (UV) gel ink drop and the solid ink drop after the temperature exposure.
4. The coating of claim 1 , wherein the surface of the oleophobic, low adhesion coating exhibits a contact angle of about 55° or greater with the one or more of the ultra-violet (UV) gel ink drop and the solid ink drop after the temperature exposure.
5. The coating of claim 1 , wherein the one or more of the UV gel ink drop and the solid ink drop exhibit a sliding angle of less than about 30° and a contact angle of greater than about 45° with the surface of the oleophobic, low adhesion coating, after a temperature exposure of less than about 330° C. at a pressure of less than about 400 psi for a period of time in a range between about 30 minutes and about 2 hours.
6. The coating of claim 1 , wherein the one or more of the UV gel ink drop and the solid ink drop exhibit a sliding angle of less than about 30° and a contact angle of greater than 45° with the surface of the oleophobic, low adhesion coating, after the oleophobic low adhesion coating being soaked in a molten solid ink or UV gel ink at a temperature ranging from about 70° C. to about 150° C. for at least about 2 days.
7. The coating of claim 1 , wherein the oleophobic, low adhesion coating is prepared by a method comprising hydrolysis and condensation of a silane-functionalized perfluoropolyether precursor, and optionally a fluorinated silane precursor.
8. The coating of claim 7 , wherein the silane-functionalized perfluoropolyether precursor has a general formula of
(R 2 O) 3 Si—R 1 —NH—CO—(CH 2 ) x —F 2 CO(CF 2 CF 2 O) m (CF 2 O) n CF 2 —(CH 2 ) y —CO—NH—R 1 —Si(OR 2 ) 3 ,
wherein m ranges from about 1 to about 50, n ranges from about 0 to about 10, x and y range from about 0 to 10, and R1 and R2 independently are alkyl groups with a general formula of C z H 2z+1 , where z ranges from 1 to 20.
9. The coating of claim 7 , wherein the optional fluorinated silane precursor has a general formula of (R 4 O) 3 Si—R 3 —(CF 2 ) q —CF 3 , wherein q ranges from about 1 to about 20, and R 3 and R 4 are alkyl group with general formula of C z H 2z+1 , where z is from 1 to 10.
10. An ink jet printhead comprising:
a support brace;
an aperture plate bonded to the support brace, the aperture plate having an aperture defined therein, wherein one or more of ultra-violet (UV) gel ink and solid ink are jettable from the printhead through the aperture; and
an oleophobic, low adhesion coating disposed on a front face of the aperture plate, wherein a surface of the oleophobic, low adhesion coating, after a temperature exposure of greater than about 200° C. for more than about 30 minutes, exhibits a sliding angle of less than about 30° with one or more jetted ink drops comprising one or more of an ultra-violet (UV) gel ink and a solid ink,
wherein the low adhesion coating is a sol-gel cross-linked coating.
11. The printhead of claim 10 , wherein the surface of the oleophobic, low adhesion coating exhibits a contact angle of greater than 45° with the one or more jetted ink drops.
12. The printhead of claim 10 , wherein the oleophobic, low adhesion coating is prepared by a method comprising hydrolysis and condensation of a silane-functionalized perfluoropolyether precursor, an optional fluorinated silane precursor, and a combination thereof.
13. The printhead of claim 10 , wherein the surface of the oleophobic, low adhesion coating further exhibits a contact angle of greater than 45° with the one or more jetted ink drops, after the oleophobic, low adhesion coating being exposed to a temperature of about 200° C. to about 330° C. at a pressure of about 100 psi to about 400 psi.