How To Use Minimum temperature film forming test equipment(MFT)

- Apr 29, 2019-

I. product introduction Minimum temperature film forming test equipment

When polymer emulsion is used as surface treatment agent for coating, adhesive, chemical fiber fabric, leather and paper, its film-forming property is one of the important technical indexes.In order to produce new products with lower film forming temperature, researchers constantly improve their technical specifications and formulations.Therefore, the detection of the minimum film forming temperature (MFT) is an important indicator of this kind of coating, which is an ideal instrument for measuring MFT conveniently.


Ii. Main parameters  MFFT test machine

Taken the gradient plate working temperature range: cold end minimum - 7 ℃ 70 ℃ of hot end

Gradient board detection point: 13

Gradient interval: 20mm

Test coating groove: 6, length 240mm, width 22mm depth 0.25mm

Inspection table shows: 16 points, 1 ~ 13 points for the working gradient temperature, 14 points for the instrument environment temperature, 15, 16 points for the cooling water inlet and outlet temperature

Power supply: 220v 50Hz ac wide voltage (three-phase power supply, good grounding)

Cooling water: general municipal water supply

Instrument shape: size 520mm width 520mm height 370mm (most)

Instrument weight :31Kg

Iii. Instrument features MFT test equipment

Desktop design, more space saving.

More advanced gradient board design for greater volume reduction.

Surface temperature accurate calibration, with the temperature scale, to ensure that the measurement data accurate and reliable.

Automatic water cut-off protection system.

Wider working table, can measure 6 sets of samples at the same time.


Iii. Instrument features

Desktop design, more space saving.

More advanced gradient board design for greater volume reduction.

Surface temperature accurate calibration, with the temperature scale, to ensure that the measurement data accurate and reliable.

Automatic water cut-off protection system.

Wider working table, can measure 6 sets of samples at the same time.


Iv. Method of use

Open the packing cases and see if there is any breakage or shortage.After verification, place the instrument in the laboratory near the upstream and downstream water, and do the cleaning work first.Then check the power input, the inlet and outlet of the water connection is correct.

Preparation before use:

Taken the boot:

Connect the power cord to the power socket (220v, 50Hz three-hole socket, must be well grounded), connect the cooling water, turn on the main power switch, heating, inspection, refrigeration switch, the instrument panel immediately shows the corresponding action (indicator light, digital display table shows the number).

Debugging instrument:

Different test conditions shall be set according to the different conditions of the film tested.It is mainly for refrigeration and heating presetting (see the manual of lu-906m intelligent regulator for setting method). The inspection table has been adjusted before leaving the factory, and generally no adjustment is required.

Thermal balance:

The time is about 120 minutes (depending on the setting temperature, if it is found that the inspection table is stable or has little change at every point from 1 to 13 within a certain time, it is the preheating), then the sample can be added.The equilibrium time depends on the minimum temperature setting. The lower the temperature setting, the longer the equilibrium time.The desiccant can be placed in the box at the same time to avoid water vapor and freezing at the cold end.


V. sample preparation

Remove the glass cover and put the emulsion to be tested and known into the gradient plate groove with a spoon or dropper.(for glass products, please handle with care)

Sample film formation:

After about 60 to 90 minutes, a series of changes take place in the coating on the gradient plate. After water evaporates from the emulsion used in latex paint, the polymer molecules interact with each other and form a continuous film at an appropriate temperature. The part higher than the emulsion MFT is transparent, and the part lower than MFT is cracked or chalky.The clear dividing line is the minimum film forming temperature (MFT) of the emulsion. After determining the film forming line, the accurate temperature is calculated with the subdivision scale of the ruler according to its position.

U shut down:

After the test, shut off the power supply and water source, clean all parts well, and prepare for the next test.


Six, matters needing attention and use skill

Keep the equipment in a well-ventilated and bright laboratory, away from moisture.When not in use, the instrument should be covered with plastic cover to keep it clean.

Power requirements: 220v, 50Hz, > 400W, three-hole socket, good grounding.

Taken the environmental requirements: temperature 23 + 2 ℃, relative humidity 85%, no sun, no vibration environment.

Water requirements: no impurities, pure tap water, must maintain smooth.

Test conditions are mainly refrigeration and heating Settings.Refrigeration mainly affects the low-temperature end work, the first point shall prevail.Heating mainly affects the work of the high temperature end, the thirteenth point shall prevail.Reduce the heat and cold difference as far as possible, which saves energy and improves the resolution.

Working table before and after use to clean, long time to put some oil or vaseline, to prevent corrosion.

Coating to be tested emulsion, there should be at least one known material for reference.

Coating emulsion does not have to be coated with test groove, as long as the estimated MFT can be coated, both labor and good cleaning.

With sanitary paper placed on the gradient board left and right edge, to prevent coating and cleaning dirty table.

In order to clean convenient, the surface of the board can be covered with a thin layer of aluminum foil (such as 0.02mm thick), brush it flat, can drop a few drops of glycerin to make aluminum foil and board closely combined.

Calcium chloride (CaCl2) desiccant selection effect is better.

Minimum Film Forming Temperature Tester(MFTT)