Quantitative test method for whitening of coating film
A test method, coating technology
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Embodiment 1
[0027] Test item: 8h water whitening resistance
[0028] Testing process:
[0029] Configure the sample paint of the coating film; in this step, the sample paint is container wood floor varnish, and the supplier is Shanghai Qinglan Wood Industry;
[0030] Prepare the prepared coating on a transparent glass plate with a 250 μm wet film maker to prepare a 250 μm wet coating film, and dry it at room temperature for 7 days before use;
[0031] Use a medium solution to test the water whitening resistance in some areas of the dried coating film, and then use a paper towel to dry the liquid on the surface of the coating film; in this step, use a 0-1000 μml microtube to measure 200 μml according to the GB / T9274 C method drop method Drip distilled water onto the coating film, drip 3-5 points, do parallel experiments, then cover the droplets with a petri dish or a transparent plastic cup, wait for 8 hours; dry the surface moisture of the sample with a paper towel;
[0032] Use a color...
Embodiment 2
[0036] Test item: 8h alkali water whitening resistance
[0037] Testing process:
[0038] Configure the sample paint of the coating film; in this step, the sample paint is container wood floor varnish, and the supplier is Shanghai Qinglan Wood Industry;
[0039] Prepare the prepared coating on a transparent glass plate with a 250 μm wet film maker to prepare a 250 μm wet coating film, and dry it at room temperature for 7 days before use;
[0040] Use a medium solution to test the water whitening resistance in some areas of the dried coating film, and then use a paper towel to dry the liquid on the surface of the coating film; in this step, use a 0-1000 μml microtube to measure 200 μml according to the GB / T9274 C method drop method Drop 5% sodium hydroxide solution on the coating film, drip 3-5 points, do parallel experiments, then cover the droplets with a petri dish or a transparent plastic cup, and wait for 8 hours; dry the liquid on the surface of the sample with a paper t...
Embodiment 3
[0045] Test item: 8h acid water whitening
[0046] Testing process:
[0047] Configure the sample paint of the coating film; in this step, the sample paint is container wood floor varnish, and the supplier is Shanghai Qinglan Wood Industry;
[0048] Prepare the prepared coating on a transparent glass plate with a 250 μm wet film maker to prepare a 250 μm wet coating film, and dry it at room temperature for 7 days before use;
[0049]Use a medium solution to test the water whitening resistance in some areas of the dried coating film, and then use a paper towel to dry the liquid on the surface of the coating film; in this step, use a 0-1000 μml microtube to measure 200 μml according to the GB / T9274 C method drop method Drop 5% hydrochloric acid solution on the coating film, drip 3-5 points, do parallel experiments, then cover the droplets with a petri dish or a transparent plastic cup, wait for 8 hours; dry the liquid on the surface of the sample with a paper towel;
[0050] U...
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