" Even though the surface tension was sufficiently low we experienced problems during the actual coating process where the wetting results were insufficient."
Have you ever experienced this dilemma?
Coating agents generally include surfactants to control their wettability to materials by lowering surface tension. The surfactants can absorb toward the solution surface gradually, changing the surface tension of the solution over time.
What does this mean? It means that surface tension has to be studied in the function of time if the target solutions include surfactants.
The widely-known Wilhelmy plate method and du Nouy ring method measure surface tension under conditions in which the surfactant absorbing has "equilibrated", called "static surface tension".
But coating solutions are in constant change, with surfactants continually absorbing to new surfaces and bulking up as micelle. In such conditions the speed at which surface tension drops - via the time function Dynamic Surface Tension - becomes important. The BP-D5 allows measuring Dynamic Surface Tension with its Bubble Pressure technique.
Applications: -Surfactant: Study of fundamental property -Ink, Coating agent: Instant wettability -Fountain solution in offset printing: Absorbing speed of surfactant -Aerosol, Emulsion: Instantaneous generation of small droplet -Detergent, Extinguishant: Initial foaming
Functions: -Lifetime can be changed automatically to draw variations over time in a single process. -Real time display of the bubble pressure waveform for monitoring of bubble generation. -One-touch adjustment of the probe's immersion depth and starting measurement. -Real time graphing of the measurement result. -Applies Rosen fitting to the measured results and presents the maximum slope of graph. -Draws up to 11 data samples on a single sheet for comparison.
Software Performances: -Real time graphing of the measurement result -Applying Rosen fitting to the measured results and present the maximum slope of graph -Draws up to 11 data samples on a single sheet for comparison -Data is saved by CSV format
Specifications: -Measurement Method: Maximum bubble pressure -Measurement Range: Surface tension: 10-100mN/m, Lifetime: 20-5000ms (Fixing mode: 20-1000ms) -Resolution: Surface tension: 0.01mN/m, Lifetime: 0.1ms -Repeatability: 0.5mN/m (standard deviation based on manufacturer's standard) -Measurement Temperature: 10-80 degrees C (option by hot/cold water circulator 4VT) -Sample Volume: about 80mL (exclusive lab dish is used) -Sample Viscosity: 0.5-10mPa's -Dimensions, Weight: 320(W)x315(D)x475(H)mm, 18.5kg (main body only) -Utilities: AC100-240V, 50/60Hz, 50W, 80VA, Pressurized dry air 0.4~0.7Mpa
Stage up/down movement-Automatic Liquid surface detection by probe-Automatic Probe immersion-Automatic Bubble generation-Automatic Constant life time measurement-Possible Temperature measurement-Standard Jacket type stage-Standard
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