FIELD: measuring equipment.
SUBSTANCE: invention relates to measurement equipment and can be used in studying mass transfer processes and for determining diffusion coefficients of solvents in articles made from capillary-porous material sheets in paper, light, construction and other industries. Method for determining diffusion coefficient of solvents in sheet products from capillary-porous materials consists in that in analyzed sheet material there is created a uniform initial content of solvent distributed in solid phase, then analyzed material is placed on a flat substrate from solvent-impermeable material, waterproofing upper surface of material, in the initial moment of time the point surface wetting of the upper surface of the analyzed article is carried out with a solvent dose, then measuring the time variation of the galvanic converter signal at a given distance from the application point of the pulse with the solvent dose, galvanic sensor signal values are recorded at two points in time and diffusion coefficient is calculated, wherein pulse action is carried out with a solvent dose calculated by formula: G ≈ 4.8ρ0Uer02h, and time moments τ1 and τ2 are fixed when equal values of galvanic converter signal are achieved in the vicinity of value 0.9 Ee, where h is thickness of analyzed material; ρ0 is density of the analyzed sample in dry state; Ue is the equilibrium concentration of the solvent in the analyzed sample upon contact with saturated solvent vapor at a given temperature; r0 is distance between electrodes of galvanic converter and point of action of solvent dose on surface of controlled article; Ee is galvanic converter signal value at concentration Ue.
EFFECT: higher accuracy of control and reduced time and costs for research.
1 cl, 1 tbl, 1 dwg
