Treatment agent for treating particles, water- repellent particles and production method therefor, water-repellent layer, and penetration preventing structure

1. A water-repellent particle comprising:

a particle; and

a water-repellent portion comprising a dried product of a treatment agent on a surface to be treated of the particle, wherein the water-repellent portion on a surface to be treated of the particle comprises a film-like water-repellent portion and/or a particulate water-repellent portion on a surface to be treated of the particle, the treatment agent comprising:

a condensation product of a liquid composition comprising at least one selected from the group consisting of a polysiloxane compound having a hydrolyzable functional group or a condensable functional group and a hydrolyzate of the polysiloxane compound having a hydrolyzable functional group or

a liquid composition comprising at least one selected from the group consisting of a polysiloxane compound having a hydrolyzable functional group or a condensable functional group and a hydrolyzate of the polysiloxane compound having a hydrolyzable functional group,

wherein the dried product of the treatment agent contains an aerogel formed from aerogel particles contained in the liquid composition, and the liquid composition contains aerogel particles in an amount of 0.1 to 10 parts by mass or less-per 100 parts by mass of the total amount of the liquid composition.

2. The water-repellent particle according to claim 1 , wherein the hydrolyzable functional group comprises an alkoxy group.

3. The water-repellent particle according to claim 2 , wherein the polysiloxane compound having the hydrolyzable functional group comprising an alkoxy group comprises a compound having a structure represented by the following formula (B);

wherein R 1b represents an alkyl group, an alkoxy group or an aryl group, R 2b and R 3b each independently represent an alkoxy group, R 4b and R 5b each independently represent an alkyl group or an aryl group, and m represents an integer of 1 to 50.

4. The water-repellent particle according to claim 1 , wherein the condensable functional group comprises at least one selected from the group consisting of a hydroxyl group, a silanol group, a carboxyl group, and a phenolic hydroxyl group.

5. The water-repellent particle according to claim 4 , wherein the hydroxyl group is contained in a hydroxyalkyl group.

6. The water-repellent particle according to claim 5 , wherein the polysiloxane compound comprises a compound having a structure represented by the following formula (A);

wherein R 1a represents a hydroxyalkyl group, R 2a represents an alkylene group, R 3a and R 4a each independently represent an alkyl group or an aryl group, and n represents an integer of 1 to 50.

7. A water-repellent layer comprising an aggregation having a plurality of the water-repellent particles according to claim 1 .

8. A penetration preventing structure comprising the water-repellent layer according to claim 7 .