Antiadhesive high temperature layers
View Patent ↗A substrate having an anti-adhesive coating thereon. The coating is made from a coating composition comprising solid particles of a release agent different from boron nitride and a binder comprising surface-modified nanoscale solid particles.
1. A substrate having a coating thereon, wherein the coating is anti-adhesive and is made from a coating composition comprising
(a) solid particles of at least one release agent different from boron nitride, which particles have a sheet lattice structure, and
(b) a binder comprising a nanocomposite of surface-modified nanoscale solid particles in an organically modified inorganic polycondensate, the nanocomposite being obtained by reacting the nanoscale particles with one or more silanes of general formula:
R x SiA (4-x) (I)
wherein the radicals A are the same or different and are hydroxyl groups or hydrolyzable groups, the radicals R are the same or different and are non-hydrolyzable groups and x is 0, 1, 2 or 3, the silanes of formula (I) comprising at least one silane wherein x in formula (I) equals 0.
2. The substrate of claim 1 , wherein in formula (I) x≧1 in at least 50 mass-% of the one or more silanes.
3. The substrate of claim 1 , wherein the nanoscale solid particles are selected from one or more of metal oxide particles and carbon black particles.
4. The substrate of claim 1 , wherein the nanoscale solid particles comprise one or more of SiO 2 , TiO 2 , ZrO 2 , Al 2 O 3 , A 1 OOH, Y 2 O 3 , CeO 2 , SnO 2 , an iron oxide, and Ta 2 O 5 .
5. The substrate of claim 1 , wherein the nanoscale solid particles comprise one or more of TiO 2 , ZrO 2 , Al 2 O 3 , A 1 OOH, Y 2 O 3 , CeO 2 , SnO 2 , an iron oxide, and Ta 2 O 5 .
6. The substrate of claim 1 , wherein the coating composition further comprises one or more inorganic fillers.
7. The substrate of claim 1 , wherein the coating comprises less than 70% by weight of the nanoscale solid particles.
8. The substrate of claim 1 , wherein the coating comprises a high-temperature-resistant layer.
9. A mold comprising a mold release layer, wherein the mold comprises the substrate of claim 1 .
10. The mold of claim 9 , wherein the mold is a metal casting mold.
11. The substrate of claim 1 , wherein the coating comprises a tribological layer.
12. The substrate of claim 1 , wherein the solid particles (a) comprise one or more of graphite, graphite compounds, metal sulfides, metal selenides and metal tellurides.
13. The substrate of claim 12 , wherein the particles (a) comprise one or more of graphite, fluorinated graphite, MoS 2 and WS 2 .
14. The substrate of claim 12 , wherein the particles (a) have an average particle diameter of less than 30 μm.
15. The substrate of claim 1 , wherein the coating comprises from 30 to 70% by weight of the particles (a).
16. A substrate having a coating thereon, wherein the coating is anti-adhesive and is made from a coating composition comprising
(a) solid particles of at least one release agent different from boron nitride, which particles have a sheet lattice structure, and
(b) a binder comprising surface-modified nanoscale solid particles selected from one or more of ZnO, CdO, GeO 2 , TiO 2 , ZrO 2 , CeO 2 , SnO 2 , Al 2 O 3 , AlO(OH), aluminum hydroxide, B 2 O 3 , In 2 O 3 , La 2 O 3 , Y 2 O 3 , an iron oxide, Cu 2 O, Ta 2 O 5 , Nb 2 O 5 , V 2 O 5 , MoO 3 , WO 3 , a sulfide, a selenide, a telluride, a halide, a carbide, an arsenide, an antimonide, a nitride, a phosphide, a zirconate, an aluminate, a stannate, a mixed oxide, carbon black, and graphite.
17. The substrate of claim 16 , wherein the nanoscale solid particles comprise one or more of TiO 2 , ZrO 2 , Al 2 O 3 , A 1 OOH, Y 2 O 3 , CeO 2 , SnO 2 ,an iron oxide, and Ta 2 O 5 .
18. The substrate of claim 16 , wherein the coating comprises less than 70% by weight of the nanoscale solid particles.
19. The substrate of claim 16 , wherein the nanoscale solid particles have been surface-modified with a surface modifier having a molecular weight of less than 1,500.
20. The substrate of claim 19 , wherein the surface modifier comprises one or more of an anhydride group, an amide group, an amino group, and a β-dicarbonyl group.
21. The substrate of claim 16 , wherein the anti-adhesive coating comprises a high-temperature-resistant layer.
22. The substrate of claim 16 , wherein the coating composition further comprises one or more inorganic fillers.
23. A mold comprising a mold release layer, wherein the mold comprises the substrate of claim 16 .
24. The mold of claim 23 , wherein the mold is a metal casting mold.
25. The substrate of claim 16 , wherein the coating comprises a tribological layer.
26. The substrate of claim 16 , wherein the solid particles (a) comprise one or more of graphite, graphite compounds, metal sulfides, metal selenides and metal tellurides.
27. The substrate of claim 16 , wherein the particles (a) comprise one or more of graphite, fluorinated graphite, MoS 2 and WS 2 .
28. The substrate of claim 16 , wherein the coating comprises from 30 to 70% by weight of the particles (a).
29. A substrate having a coating thereon, wherein the coating is anti-adhesive and is made from a coating composition comprising
(a) solid particles of at least one release agent different from boron nitride, which particles have a sheet lattice structure, and
(b) a binder comprising nanoscale solid particles which have been surface-modified with a surface modifier having a molecular weight of less than 1,500 and comprising one or more of an anhydride group, an amide group, an amino group, and a β-dicarbonyl group.
30. The substrate of claim 29 , wherein the nanoscale solid particles comprise one or more of SiO 2 , TiO 2 , ZrO 2 , Al 2 O 3 , A 1 OOH, Y 2 O 3 , CeO 2 , SnO 2 , an iron oxide, and Ta 2 O 5 .
31. The substrate of claim 29 , wherein the solid particles (a) comprise one or more of graphite, graphite compounds, metal sulfides, metal selenides and metal tellurides.
32. A method of providing a substrate with an anti-adhesive coating, wherein the method comprises applying the coating composition of claim 1 onto the substrate and curing the applied coating composition.
33. A method of providing a substrate with an anti-adhesive coating, wherein the method comprises applying the coating composition of claim 16 onto the substrate and curing the applied coating composition.
34. A method of providing a substrate with an anti-adhesive coating, wherein the method comprises applying the coating composition of claim 29 onto the substrate and curing the applied coating composition.