Minimum film forming temperature (MFFT) is very important for the technical specification and formulation of waterborne coatings for forced drying of emulsion paints.Several methods of testing using thermal gradient bars have been designed, although some are of limited accuracy and questionable reproducibility.A recommended test method is described in ASTM (D2354).
In MFFT minimum film temperature tester, the cooling and heating elements are combined with nickel-plated copper plates, and special attention is paid to ensure good thermal coupling.This results in quick response and operational balance since the power is switched on.Excellent adiabatic protection ensures simple and stable operation conditions.
ASTM D 2354/86 requires a constant flow of clean, dry air across the test surface.It has been proved that this uniform airflow is provided by the air conditioning unit (including the pressure regulator, filter, drying and flow controller) within the housing of the device.This clean, dry air is piped to a finely designed porous sintered bronze distribution system that distributes the air evenly over the test surface.If MFFT is used to test multiple identical latex strips coated on the surface of the sample and the results are consistent, it indicates that the above airflow arrangement is perfect and correct in the end.
A clear plastic cover with a hinged metal frame, including the test plate, also ACTS as an insulation.
Minimum Film Formation Temperature (MFFT) Test Machine of Emulsion Vehicles, which had snowflakes forming at its air intakes, could completely solve the problem.However, if you disconnect the air dryer or open the cover, snowflakes will form on the test board and you will easily see the frost line.
In MFFT, the temperature measurement accuracy can be up to 0.1 in the interval of 37mm, and the temperature at each point can be displayed, or can be switched to the differential mode. At this time, the temperature difference between this point and the two sensors close to it should be the same.We provide a hole plug that can receive input from the probe.The probe is used to check the temperature at a point on the board or to check the MFFT calibration and its temperature control.
The standard device has six programs
Cold end hot end cold end hot end
-5 +13 +15 +33
-0 +18 +23 +50
+5 +23 +33 +60
Additional high temperature ranges can be provided if desired
The hot end of the cold end
When the device is in balance, up to eight parallel coatings can be applied using a 1-inch, 75-micron cubic applicator.It can be left or right.In general, at least one of them should be coated with known materials for comparison purposes.
After 60 to 90 minutes, condensation will occur.You can read the temperature using the cursor scale by simply moving the rectangular transparent gauge (the black line) towards the condensation point.
The cleaning of the test plate should be carried out immediately after the test. However, in order to simplify the cleaning work, the self-adhesive tape can be attached on the surface first, and then the coating film on the adhesive tape.Experiments show that the temperature deviation measured on the film is less than 0.1 degree, and the required cleaning time is only a few minutes.
Lights indicate that heating or cooling is in progress, and there are alarms about water failure, as well as automatic power-off devices to protect the control circuit.
The electronic controllers are designed to be modular and can be replaced in a matter of minutes.
These fatures make the MFFT a simple, semi-mobile device that is ready to be used in a short time and therefore suitable for production testing.
MFFT complies with ASTM D2354, ISO 2115, BS 2728, part 7, 740C.
1. The host is equipped with smooth test tablets, tablets containing 10 ascend a temperature sensor, 37 mm (2) each sensor interval instrument measuring range - 5 ° C to 90 ° C, the temperature of the temperature sensor area formed automatically, automatic water system.
3. The temperature precision: - 5 ° C to 70 ° C, 0.1%;70 ° C to 90 ° C, 2.2 to 0.3%. The resolution: 0.1 ° C.
4. Protective cover is provided on the plate to prevent external temperature and airflow from entering.
5. The air pump is built in the main engine, which blows the air through the test sample evenly through the desiccant. There is a complete built-in air conditioning system.
6. The temperature corresponding to the pointer can be displayed in the static mode, or the difference mode can be switched.
7. ASTM D 2354 and ISO 2115,DIN 53787(special order required).
8. Sound and light warning for water flow fault and light warning for cooling fault.