FIELD: chemistry.
SUBSTANCE: method involves preparing a concentrated polymer solution with approximately the same density as a stream of liquid on a surface, injecting a mixture/solution into the stream of liquid. Injection is carried out such that a polymer coating, thickness of which increases over time from the beginning, is adsorbed on the surface. The rate of injecting the first liquid is then lowered so that the polymer coating becomes thinner over time. The steps can be repeated to maintain a minimum coating thickness for a long time.
EFFECT: reduced polymer consumption for given reduction of hydrodynamic resistance; the obtained viscoelastic coating prevents sticking and growth of natural organisms caused by hydrodynamic resistance and can be used not only during station time.
5 cl
