초록 ▼

The present invention is directed to a process for obtaining a substrate provided with a coating having photocatalytic properties, wherein the coating includes crystallized particles of an oxide of a metal A having photocatalytic properties. The crystallized particles are incorporated into the coati

The present invention is directed to a process for obtaining a substrate provided with a coating having photocatalytic properties, wherein the coating includes crystallized particles of an oxide of a metal A having photocatalytic properties. The crystallized particles are incorporated into the coating using a mineral binder comprising at least one oxide of a metal B also having photocatalytic properties in the crystallized state. The coating optionally includes at least oxide of a metal M devoid of photocatalytic properties and/or at least one silicon compound of the silicon oxide SiO2 type. The coating is deposited from liquid-phase dispersions containing the crystallized particles of the oxide of metal A and at least one precursor compound for the oxide of metal B of the binder and optionally a precursor compound for the oxide of metal M and for the Si compound, in a relative proportion A/(B+M+Si) by weight of the metals and Si ranging between 60/40 and 40/60. The present invention is also directed to substrates containing a photocatalytic coating and to liquid-phase dispersions which are used in the preparation of the photocatalytic coatings.

대표청구항 ▼

1. A coated substrate prepared by a process comprising:(a) preparing a substrate for deposition with a coating, wherein the coating comprises crystallized particles of an oxide of a metal A having photocatalytic properties, a mineral binder comprising at least one oxide of a metal B having photocata

1. A coated substrate prepared by a process comprising:(a) preparing a substrate for deposition with a coating, wherein the coating comprises crystallized particles of an oxide of a metal A having photocatalytic properties, a mineral binder comprising at least one oxide of a metal B having photocatalytic properties, optionally at least one oxide of a metal M devoid of photocatalytic properties, and optionally at least one silicon oxide; (b) depositing the coating onto a surface of the substrate, by depositing the coating from liquid-phase dispersions containing oxides of the metals A and B, optionally the oxide of metal M and optionally the silicon oxide, in a relative proportion by weight of the metals and Si given by A/(B+M+Si), the relative proportion ranging from 60/40 to 40/60; and (c) allowing the coating to set; to provide the coated substrate, wherein the coating comprises crystallized particles of the oxide of metal A having photocatalytic properties incorporated into the coating using an at least partially crystallized mineral binder comprising the oxide of metal B also having photocatalytic properties in the crystallized state, optionally at least one oxide of a metal M devoid of photocatalytic properties and optionally a silicon oxide, wherein the coating has a porosity of between 45% and 65%.