METHOD, DEVICE, AND MATERIALS FOR CLEANING AND PROTECTING SOLID SURFACES Russian patent published in 1998 - IPC

FIELD: cleaning methods. SUBSTANCE: surface is prepared by jet-abrasive cleaning to open surface pore openings with summary area S₁ which is chosen in relation to cleaned surface area S₂ within the range 1 ≤ (S₁ + S₂)/S₂ ≤ 1.3. Simultaneously surface layers are removed, their minimum and maximum thickness (d₁ and d₂) being chosen from inequality: 1 ≤ (d₁ + d₂)/d₂ ≤ 2. Thereafter, a protective layer is applied, advantageously from polysiloxane solutions, which are made penetrate into opened pores to the depths, minimum (d₃) and maximum (d₄) values of which are found from inequality: 5,1•10^-2 ≤ d₃/d₄ ≤ 0.53. Applied layer is hardened for 6 to 24 h at temperatures within the range found from inequality: 8,1•10^-2 ≤ T₁/T₂ ≤ 1 under air humidity from 30 to 100%. In the cleaning process, removed are pollution surface layers, and/or oxide film layers, and/or solid surface material layers. When surface undergoes water-abrasive treatment with consumption of liquid from 0.14 to 0.28 l/s, relative volume content of abrasive in supplied liquid (extreme values V₁ and V₂) is chosen from inequality: 1.05 ≤ (V₁ + V₂)/V₂ ≤ 1.5. Pressure of jet ranges from 150 to 500 bar. Chemical preparation of surface is accomplished by applying paste-like alkaloid compounds and ageing it on the surface from 5 to 30 min at 5 to 30 C, after which transformed layer is removed by turbulized liquid jet. In jet device, there is a small longitudinally perforated turbine located within the head. A rod with spheroid end from wear- resistant plastic directed outward is located in the perforation free to move along axis and to perform oscillatory-rotatory movements. Active substance of cleaning material is organic ammonium compounds and air-hardenable protective materials are polysiloxanes homogenized to a specified extent. EFFECT: enhanced surface cleaning efficiency and prolonged service life of protective coatings. 7 cl, 1 dwg