Acoustic tile

Abstract

An acoustic tile comprising a perforated support wherein one of the faces is covered on its entire surface with a nonwoven material, characterized in that the material is coated on at least one face by a photocatalytic composition comprising at least one photocatalyst agent.

1 . An acoustic tile comprising a perforated support wherein one of the faces is covered on its entire surface with a nonwoven material, characterized in that the nonwoven material is covered on at least one face by a photocatalytic composition comprising at least one photocatalyst agent. 
     
     
         2 . The tile according to  claim 1 , characterized in that the photocatalyst composition is applied onto the face of the material facing the support. 
     
     
         3 . The tile according to  claim 1 , characterized in that the photocatalyst composition is applied onto a face at a rate of 2 to 50 g/m 2 , advantageously on the order of 4 to 12 g/m 2 . 
     
     
         4 . The tile according to  claim 1 , characterized in that the photocatalyst composition is applied onto two faces of the material. 
     
     
         5 . The tile according to  claim 4 , characterized in that the photocatalyst composition is applied by impregnation at a rate of 2 to 100 g/m 2 , advantageously 8 to 20 g/m 2 . 
     
     
         6 . The tile according to any of the previous claims, characterized in that the photocatalyst agent is TiO 2  having a specific surface area greater than 225 m 2 /g and a particle size on the order of 15 nm. 
     
     
         7 . The tile according to any of the previous claims, characterized in that the photocatalyst composition furthermore contains adsorbent particles. 
     
     
         8 . The tile according to  claim 7 , characterized in that the adsorbent particles represent between 1 and 50% by weight of the photocatalyst composition, advantageously between 5 and 25%. 
     
     
         9 . The tile according to any of the previous claims, characterized in that the photocatalyst composition contains, as a binding agent, an aqueous colloidal dispersion of SiO 2  containing between 20 and 50% by weight of SiO 2  with a size of between 10 and 50 nm, advantageously between 20 and 30 nm. 
     
     
         10 . The tile according to  claim 1 , characterized in that the photocatalyst composition contains from 10 to 60 parts (dry), advantageously 50 dry parts of an aqueous colloidal dispersion of SiO 2  containing between 20 and 50% by weight of SiO 2  with a size of between 10 and 50 nm, advantageously between 20 and 30 nm, the complement to 100% being constituted by TiO 2  and possibly by adsorbent particles. 
     
     
         11 . The tile according to  claim 10 , characterized in that the complement to 100% is constituted of 25 to 45 parts of TiO 2  and 5 to 25 parts of adsorbent particles, such as, in particular, zeolite. 
     
     
         12 . The tile according to the previous claim, characterized in that the support is in plaster, wood, metal or PVC.