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EP-4741618-A2 - INSULATED GLASS UNIT WITH INFRARED REFLECTING PIGMENTATION IN THE MASK

EP4741618A2EP 4741618 A2EP4741618 A2EP 4741618A2EP-4741618-A2

Abstract

The invention regards a vacuum insulated glazing unit comprising a first glass pane (10) and a second glass pane (20) each having inner surfaces (11, 21) opposing each other; a side seal (4) arranged between the first glass pane (10) and the second glass pane (20) creating a sealed cavity (40) between the glass panes (10, 20); and a plurality of pillars arranged between the opposed inner surface (11) of the first glass pane (10) and the inner surface (21) of the second glass pane (20), and wherein the sealed cavity (40) has a pressure between the two glass panes no higher than 0.001 mbar; wherein the first glass pane (10) and the second glass pane (20) each comprises an edge surface region (14, 24) overlapping the side seal (4) along at least a first part of the side seal (4), wherein at least the edge surface region (14) of the first glass sheet (10) comprises an enamel layer (16, 26) comprising pigments, wherein the one or two enamel layers (16, 26) are positioned on the inner surface (11, 21) of the respective glass pane (10, 20) and arranged so as to cover the side seal (4), wherein the inner surface of at least the first glass pane (10) further comprises a low emittance coating layer (18), and wherein the enamel layer (16) on the first glass sheet (10) is arranged at a minimum separation distance (d_sep) of at least 1.5 mm, such as at least 2 mm, or such as at least 3 mm from the low emittance coating layer (18).

Inventors

  • JOHNSEN, SIMON
  • VANDEREECKEN, PATRICK

Assignees

  • VKR Holding A/S

Dates

Publication Date
20260513
Application Date
20210504

Claims (15)

  1. A vacuum insulated glazing unit comprising: • a first glass pane (10) and a second glass pane (20) each having inner surfaces (11, 21) opposing each other; • a side seal (4) arranged between the first glass pane (10) and the second glass pane (20) creating a sealed cavity (40) between the glass panes (10, 20); and • a plurality of pillars arranged between the opposed inner surface (11) of the first glass pane (10) and the inner surface (21) of the second glass pane (20), and wherein the sealed cavity (40) has a pressure between the two glass panes no higher than 0.001 mbar; wherein the first glass pane (10) and the second glass pane (20) each comprises an edge surface region (14, 24) overlapping the side seal (4) along at least a first part of the side seal (4), wherein at least the edge surface region (14) of the first glass sheet (10) comprises an enamel layer (16, 26) comprising pigments, wherein the one or two enamel layers (16, 26) are positioned on the inner surface (11, 21) of the respective glass pane (10, 20) and arranged so as to cover the side seal (4), wherein the inner surface of at least the first glass pane (10) further comprises a low emittance coating layer (18), and wherein the enamel layer (16) on the first glass sheet (10) is arranged at a minimum separation distance ( d_sep ) of at least 1.5 mm, such as at least 2 mm, or such as at least 3 mm from the low emittance coating layer (18).
  2. The vacuum insulated glazing unit according to claim 1, wherein the low emittance coating layer comprises silver.
  3. The vacuum insulated glazing unit according to any of the preceding claims, wherein the inner surface of the second glass pane (20) comprises a low emittance coating layer (18), such as the same low emittance coating (18) as the inner surface of the first glass pane (10).
  4. The vacuum insulated glazing unit according to claim 3, wherein the enamel layer (26) on the second glass sheet (20) is arranged at a minimum separation distance (d_sep) of at least 1.5 mm, such as at least 2 mm, or such as at least 3 mm from the low emittance coating layer (18).
  5. The vacuum insulated glazing unit according to any of the preceding claims, wherein the at least one low emittance coating (18) comprises a plurality of coating layers.
  6. The vacuum insulated glazing unit according to any of the preceding claims, wherein the at least one low emittance coating (18) comprises a layer of infrared-reflecting film, such as a film comprising a conductive metal, such as silver, gold, or copper.
  7. The vacuum insulated glazing unit according to any of the preceding claims, wherein the at least one low emittance coating (18) comprises a dielectric film, such as a film comprising oxides of zinc, tin, indium, bismuth, and/or titanium.
  8. The vacuum insulated glazing unit according to claim 7, wherein the at least one low emittance coating (18) comprises at least one silver layer sandwiched between two layers of the transparent dielectric film.
  9. The vacuum insulated glazing unit according to any of the preceding claims, wherein the at least one tempered glass pane is thermally tempered.
  10. The vacuum insulated glazing unit according to any of the preceding claims, wherein the enamel layer (16, 26) has been applied to the at least one tempered glass pane prior to strengthening of the glass pane(s).
  11. The vacuum insulated glazing unit according to any of the preceding claims, wherein the pigments of the enamel layers comprises one or more metals • Aluminum • Antimony • Bismuth • Cobalt • Copper • Chrome • Iron • Manganese • Nickel • Titanium • Vanadium • Zinc • Zirconium.
  12. The vacuum insulated glazing unit according to any of the preceding claims, wherein the side seal is a glass side seal material, such as an amorphous glass solder material.
  13. The vacuum insulated glazing unit according to claim 12, wherein the side seal comprises a low melting glass component.
  14. The vacuum insulated glazing unit according to any one of claims 12-13, wherein the glass solder material comprises at least one oxide selected from • vanadium oxide, • barium oxide, • zinc oxide, • bismuth oxide, • aluminum oxide, • silicon oxide, • magnesium oxide, • chromium oxide, • iron oxide, • cobalt oxide, • sodium oxide, • manganese oxide, • tantalum oxide, • molybdenum oxide, • niobium oxide, • tellurium oxide, or any combinations of one or more thereof.
  15. The vacuum insulated glazing unit according to any one of claims 12-14, wherein the side seal material comprises less than 0.1% lead.

Description

The invention relates to an insulate glazing unit with an enamel layer reflecting near infrared radiation. Background Insulated glass (IG) units include two or more glass panes separated by e.g. gas-filled space to reduce heat transfer across a part of the building envelope. At the periphery of the glass panes are a side sealing to provide the closed space between the glass panes. The IG units provide thermal and noise insulating properties. To hide the side sealing, the side sealing may be covered by a dark mask layer thereby making it appear aesthetically more appealing for the viewer. When exposed to sun light, the mask layer is heated due to the increased absorption of radiation from the sun by the dark colour. In particular, IG units installed in windows exposed to large amounts of sun, e.g. roof top windows, may heat up to a very high temperature around the peripheral side sealing. If blinds are installed in connection with the window, reflection from the blinds may further increase the temperature at the peripheral side sealing due to the blinds reflecting the sun light onto the peripheral side sealing. The increased temperatures may weaken the side seal and result in small fractures into the before closed space between the glass panes, which in turn reduces the thermal and noise insulating properties. Summary Disclosed herein is an insulated glazing (IG) unit comprising: ∘ a first glass pane and a second glass pane each having inner surfaces opposing each other, and∘ a side seal arranged between the first glass pane and the second glass pane creating a sealed cavity between the glass panes; wherein the first glass pane comprises an edge surface region overlapping the side seal along at least a first part of the side seal, wherein the edge surface region comprises an enamel layer comprising pigments, wherein the pigments reflect at least 40% of solar radiation in a near infrared wavelength range between 700-2500 nm. By edge surface region is included a region close to or at the peripheral edge of the glass pane. The edge region also includes a region starting at a smaller distance from the peripheral edge of the glass pane. Such distance could be up to 10 cm or more depending on the size of the IG unit and also on the frame into which the IG unit is meant to be mounted. By including pigment reflecting large parts of the near infrared solar radiation, the temperature in the edge surface region with the side seal is reduced. If the space between the glass panes are filled with a gas, the drop in temperature reduces leakage of the gas inside the IG unit. The reduction of temperature around the side seal also serves to prevent moisture ingress inside the IG unit. The thermal gas pressure in IGU may also be lowered with lower temperature. Sealant used for sealing the cavity between the glass panes may degraded over long periods of use when exposed to sunlight/heat. This degradation is reduced when implementing the near infrared reflecting pigments in the enamel layer for reducing the temperature in particularly around the side sealing. Also disclosed herein is a roof or skylight window comprising a frame and an insulated glazing unit according to the above. For IG units exposed to direct solar radiation of 900W/m2 (direct solar radiation as defined in ASTM G-173), experiments have shown that the temperature may easily be reduced by 10 degrees Celsius when including the near infrared reflecting pigments in the enamel layer as compared to when omitting the near infrared reflecting pigments. Thus, in one or more examples, the insulated glazing unit may have a periphery temperature at the edge surfaces region, wherein the pigments reduces the periphery temperature by at least 10 degrees when the insulated glazing unit is exposed to direct solar radiation of 900W/m2. The enamel layer may be positioned on the inner surface of the first glass pane. When the IG unit is used in a window unit with the first glass pane positioned as the outermost glass pane directly exposed to sun light radiation, the enamel layer reflect the near infrared radiation from the sun greatly reducing the amount of near infrared radiation coming into contact with the side seal. The second glass pane may also comprise an enamel layer. Thus, the second glass pane may comprise an edge surface region overlapping the side seal along at least a second part of the side seal, wherein the edge surface region comprises an enamel layer, wherein the enamel layer is positioned on the inner surface of the second glass pane. In addition or as an alternative, the enamel layer(s) may be positioned on one or both of the outer surface(s) of the glass pane(s). This further reduces the amount of near infrared sun light penetrating through the glass pane an into the side seal. In one or more examples, the pigments reflects at least 50% of solar radiation in the near infrared wavelength range between 700-2500 nm, such as at least 60%, such as at least 70%, such