WATER REPELLENT ELEMENT AND METHOD OF HYDROPHOBIC COATING PRODUCING Russian patent published in 2008 - IPC B60R13/00 

FIELD: technological processes.

SUBSTANCE: method of hydrophobic coating producing implies deposition of hydrophobic polymer or mixed polymer to bed surface. Hydrophobic polymer or mixed polymer are deposited to bed with unsmooth surface, characterized by formula r>1, where r is undulation coefficient, determined relation between surface content and its geometrical projection onto two-dimensional subspace. The bed with polymer or mixed polymer is placed into reactor. The latter is hermetically sealed; after that, in it a solution with supercritical CO₂ is created. Deposition is performed at pressure from 7 to 100 MPa and temperature from 35 to 200°C during period of time from 15 minutes to 24 hours, after that decompression is performed. Onto the produced water repellent element surface a hydrophobic coating from polymer solution is applied. Hydrophobic coating is applied from hydrophobic polymer or mixed polymer. One of the solvent components is supercritical CO₂.

EFFECT: water repellent capability is increased due to lending ultrahydrophobic properties to the surface.

17 cl, 2 dwg, 38 ex