Composition for use as NO_xremoving translucent coating

摘要

An improved composition capable of forming a translucent coating on a construction material surface comprising at least:
a) photocatalytic titanium dioxide particles having at least a de-NOx activity;b) a silicon based-material in which said particles are dispersed, wherein said silicon based material includes at least one polysiloxane; andc) particles having a de-HNO3 activity selected from calcium carbonate, magnesium carbonate and mixtures thereof.

主权项

1. A composition capable of forming a translucent coating on a construction material surface, comprising:
a) photocatalytic titanium dioxide particles having a de-NOx activity, the photocatalytic titanium dioxide particles consisting essentially of at least 50% by mass of an anatase crystalline form having a mean size range of from 1 nm up to 150 nm and a surface area per gram of at least 30 m2/g, b) a silicon based-material in which said photocatalytic titanium dioxide particles are dispersed, wherein said silicon based material includes at least one polysiloxane derivative having the formulawhereinR1 and R2 are alkyl radicals of from 1 to 20 carbon atoms or phenyl, and
c) de-HNO3 particles having a de-HNO3 activity, wherein the de-HNO3 particles are selected from the group consisting of calcium carbonate, magnesium carbonate and mixtures thereof, wherein
(i) the photocatalytic titanium dioxide particles and the de-HNO3 particles are present in an amount lower than 20% by weight of the total weight of said composition, and the photocatalytic titanium dioxide particles are present in an amount of at least 5% by weight of the total weight of said composition,(ii) the ratio of de-HNO3 particles to photocatalytic titanium dioxide particles is in the range of from 0.05 to 2.