Steel drum coating viscosity measurement method

Drums coating when the coating viscosity measurement, the quality of the coating has a very important role. The viscosity of the coating with the different methods of coating.Paint viscosity is too large, a serious waste of paint, and the steel drum surface is uneven coverage, poor leveling; paint viscosity is too small, poor coverage of the surface of the steel drums, open at the end is serious. Some operators only experience the paint viscosity adjustment, although this can also maintain production, but it is difficult to ensure quality remained stable. Therefore, the most scientific to be the measurement of the viscosity, in order to ensure the continued stability of the coating quality. However, in practical applications, most of the operator can not correctly use the viscosity of the cup, and thus less than the measurement purposes.

1. What is commonly used in paint viscosity measurement tools, how its structure?

The common coating viscosity measurement tool is "Tu-4 viscosity cup. The viscosity cup is designed and manufactured according to GB1723-79 standards, belongs to the instruments used to control and test laboratories and workshops. Its viscosity measured as the viscosity of the conditions, i.e. a certain amount of the sample at a certain temperature, the time of outflow from the hole of predetermined diameter. There are three different materials of the cup body of the instrument, i.e. plastics, aluminum, copper, steel drums and Paint viscosity measurements, multi-standard aluminum cup. Such viscosity cup with small size, light weight, easy to use, reliable data.

Tu-4 viscosity cup of the main technical indicators are as follows:

(1) measurement range: 10 ~ 150s.

2 cup capacity: 100 +1 mL.

(3) flow outlet size: diameter Ø4 ± 02mm; the high ± 0. 02mm.

4 cup body cone angle: 81 ° ± 15 '.

The ⑤ Cup diameter of the cylinder in the body: φ49.5 ± 0. 2mm.

Tu-4 viscosity cup structure as shown below.



Tu-4 viscosity cup structure diagram

Spout; 2 compression nut; 3. The container body; 4. Bracket; 5. Inlay tube; 6 top wire; 7. Pillar; 8. Leveling screws; 9. Nut; 10. Alignment angle; 11. Base; 12 fixed angle

2. How to properly use the Tu-4 viscosity cup to measure the viscosity of the paint?

(1) before the measurement, with gauze or cotton wool dipped in paint solvent used, the internal viscosity cup wipe clean. Especially spout part light observation, if you do not clean, should continue to wipe until clean.

(2) paint sample temperature maintained that 25 ± 1 ℃, sample test bars Stir well, and still more than two minutes without air bubbles in the sample.

3 will wipe clean and assembled viscosity cup on the stand. Leveling screw of the bracket is level, the viscosity cup in a horizontal position.

(4) in the the viscosity Cup leakage Tsui following placed 150ml enamel cup. Flow outlet nozzle blocked with a finger, it will be the test sample, filling viscosity cup, scrape off the excess sample test bars in the grooves along the edges of the viscosity cup (Note: At this point there should be no air bubbles in the sample ). Then, lift your finger, at the same time start the stopwatch. When the the sample stream silk interrupt and showed the first drop of to stop the stopwatch. In this case, the time indicated by the stopwatch is the efflux time of the sample, is the condition of the paint viscosity.

⑤ same sample viscosity value should be three times, and the arithmetic average.However, once again the determination of the value of the difference should not be greater than 3% of the average.

The ⑥ viscometer after use, pay attention to the viscometer to wipe clean place saved.