Brush resistance tester test method analysis

Brush resistance tester evaluates the anti-scrubbing ability of the painted surface tested by brush, sponge, cleaning cloth, sandpaper or other methods, and is applied to the scrubbing resistance test of interior wall coatings, floor tiles, shower rooms and furniture surfaces, which is the test equipment independently developed and produced by Shanghai Qianshi Precision Electromechanical Technology Co.
, Ltd.
, which is cost-effective and has complete
after-sales service.

Conforms to the standard: paint varnish: ISO 11998; interior wall coating: ASTMD3450, ASTMD4213, ASTMD4828, ASTMD2486; Floor wax: ASTMD1792, ASTMD3206, ASTMD3207; Building materials coatings: GB/T9266-88 "Determination of brush resistance of architectural coatings" Test method A: Thoroughly stir the test paint to remove all air bubbles and particles
.

For each coating, 3 strips of coating
need to be pulled out.

Scrape off the paint
using the same 0.
18mm gap film coating model on the black plastic panel.

The application time from one end to the other is about 3 to 4 s, preventing the formation of bubbles or cavities
in the film.

Placed horizontally in air at 23±2 °C and 50±5% relative humidity for 7 days
.

Soak the brush in water
.

Place the sample plate in the carrier tray of the scrub tester
.

Make sure the copper gasket is smooth and burr-free, positioned
perpendicular to the brush path.

Gently wipe the sample plate and place it above the copper strip with the paint face facing upwards
.

Make sure there are no defects in the sample membrane above the copper sheet and that the test area is horizontal
.

Place the positioning frame in the dish and clamp it.
To start the trial, it should be confirmed that the brush has been pretreated with 400 cycles
.

Remove the brush and shake off excess water
.

Stir the scrub medium evenly, remove about 10g and spread evenly over the
sample.

Place the brush at one end
of the path.

Wet the panel
with 5 mL of water in the path of the brush.

Start testing
.

After 400 cycles, if there is no failure, remove the brush (do not rinse), add 10 g of agitated scrubbing medium again, and add 5 mL of water to the path of the brush, then continue scrubbing
.

When a continuous thin line is scrubbed on the copper strip at a width of 12.
7mm, the number of cycles is recorded
.

If necessary, stop the machine and wipe the gasket area to determine if the end point
is reached.

Test two coatings
.

If the difference between the two results exceeds 30% of the average, test a third coating
.

Discard one of the three results with too much deviation and average
the remaining results.

Test Method B: Mix the test paint and reference paint thoroughly to remove all air bubbles and particles
.

Follow the procedure described above and pull out two coatings
side by side.

Prepare three sets of sample plates
for each test paint (including reference paint).

The coating should be pulled out as simultaneously as possible, and the coating part should be in the middle
of the sample.

Dry under standard conditions for 7 days
.

Place the sample plate and 2 copper strips in a similar method to Method A and fix well
.

To start the trial, it should be confirmed that the brush has been pretreated with 400 cycles
.

Remove the brush and shake off excess water
.

Stir the scrub medium evenly, remove about 10g and spread evenly over the
sample.

Place the brush at one end
of the path.

Wet the panel
with 5 mL of water in the path of the brush.

It is recommended to change the position of the test paint and the reference paint in the two sets of sample plates to test
.

That is, one sample plate has a reference paint on the right side, and a reference paint
on the left side of the second sample plate.

Record the number of cycles
of continuous thin lines (scrub marks) above the test paint and the reference paint, respectively.

If necessary, stop and wipe the copper strip area to determine if the test endpoint is reached
.

Test two coatings
.

If the difference between the two results exceeds 30% of the average, test a third coating
.

Discard one of the three results with too much deviation and average
the remaining results.